720P Direct View View LCD Training
Direct View LCD
LCD-DV Troubleshooting 32" Class HD 720P LCD TV (31.5" diagonally)
Prel Prelim imin inar ar Sect Sectio ion: n: Contact Information, Preliminary Matters, Specifications, LCD Overview, General Troubleshooting Steps, Si nal Distribution Disassembl Instructions and Volta es Disassembly Section: Removal of Circuit Boards Troubleshooting Section: Board Operation Troubleshooting Troubleshooting of : • Switch Mode Power Supply • Ballast (Backlight Driver) • Main Board • Ft Control Board • Key Board
• Speakers
2
Nov No vem embe berr LCD LCD TV
32L 2LD3 D35 50
Section 1 This Section will cover Contact Information and remind the Technician Technician of Important Safety Precautions for the Customers Safety as well as the Technician Technician and the Equipment. Basic Troubleshooting Troubleshooting Techniques Techniques which can save time and money sometimes can be overlooked. These techniques will also be presented. s ect on w get t e ec n c an am ar w t t e Layout of the LCD Display Panel.
sassem y,
ent cat on an
At the end of this Section the Technician should be able to Identify the Circuit Boards and have the ability and knowledge necessary to safely remove and replace any Circuit Board or Assembly. Assembly.
3
Nov No vem embe berr LCD LCD TV
32L 2LD3 D35 50
The information in this training manual is intended for use by persons possessing an adequate background in electrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major Product, personal injury and property damage can result. The manufacturer or seller maintains no liability for the interpretation of this information, nor can it assume any liability in conjunction with its use. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or . , , , , , service, they must be returned to their original positions and properly fastened.
To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for dia nosis or test ur oses, disconnect the ower immediatel after erformin the necessar checks. Also be aware that many household products present a weight hazard. At least two people should be involved in the installation or servicing of such devices. Failure to consider the weight of an product could result in physical injury.
4
November LCD TV
32LD350
(Electrostatic Static Discharge) Today’s sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damage the electronics in a manner that renders them inoperative or reduces the time until their next failure. Connect an ESD wrist strap to a ground connection point or unpainted metal in the product. Alternatively, you can touch your finger repeatedly to a ground connection point or unpainted metal in the product. Before , unpainted metal in the product. Handle the electronic control assembly by its edges only. When repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation. This equipment generates, uses, and can radiate radio frequency energy, and, if not installed and used in accorda nce with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to , , encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna; Increase the separation between the equipment and the receiver; Connect the equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the dealer or an experienced radio/TV technician for help.
5
November LCD TV
32LD350
LG Contact Information
Customer Service (and Part Sales)
(800) 243-0000
Technical Support (and Part Sales)
(800) 847-7597
USA Website (GSFS)
http://gsfs-america.lge.com
Customer Service Website
http://www.us.lgservice.com
Knowledgebase Website
http://lgtechassist.com
New: 2010 Models Wireless Ready Software Downloads for
LG Web Training
https://lge.webex.com
Presentations with Audio/Video and Screen Marks
earn ng
ca emy
p: n. ge.com earn
http://136.166.4.200
Training Manuals, Schematics with Navigational Bookmarks, Start-Up Sequence, Owner ’s Guides, Interconnect Diagrams, Dimensions, Connector IDs, Product Pictures and Featur es. , , , , , , , , , , 42SL80, 47LG90, 47LH85, 42LE5500, 42LX6500 (3D), 47LX9500 (3D), 55LX6500 (3D) 42PG20, 42PJ350, 42PQ20, 42PQ30, 50PG20, 50PJ350, 50PK250, 50PK750, 50PS80, 50PK950, PLASMA: 50PS60, 60PK750, 60PK950, 60PS11, 60PS60, 60PS80
LCD-DV:
Also available on the Plasma Page: PDP Panel Alignment Handbook, Plasma Control Board ROM Update (Jig required)
New Training Materials on the Learning Academy site
Published July 2010 by LG Technical Support and Training LG Electronics Alabama, Inc. 201 James Record Road, Huntsville, AL, 35813. 6
November LCD TV
32LD350
Safety and Handling Regulations 1. Approximately 20 minute pre-run time is required before making any picture performance adjustments from the Menu. 2. Refer to the Voltage/Current silk screening on the Switch Mode Power Supply. 3. C-MOS circuits are sensitive to static electricit . Use caution when dealing with these IC and circuits. 4. Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit. 5. Be cautious of lost screws and other metal ob ects to revent a ossible short in the circuitry.
Checking Points to be Considered 1. Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part number accuracy. . . . 3. Check details of defective condition and history. Example: Oscillator failure dead set, etc…
7
November LCD TV
32LD350
Define, Localize, Isolate and Correct •Define Look at the symptom carefully and determine what circuits could be causing the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components. Capacitors will sometimes leak dielectric material . , relay closing etc. Observation of the front Power LED may give some clues. •Localize
After carefully checking the symptom and determining the circuits to be
always be the DC Supply Voltages to those circuits under test. Always confirm the supplies are not only the proper level but be sure they are noise free. If the supplies are missing check the resistance for possible short circuits. •Isolate To further isolate the failure, check for the proper waveforms with the Oscilloscope to make a final determination of the failure. Look for correct Amplitude Phasing and Timing of the signals also check for the proper Duty Cycle of the signals. Sometimes “ ” “ ” . •Correct The final step is to correct the problem. Be careful of ESD and make sure to check the DC Supplies for proper levels. Make all necessary adjustments and lastly always .
8
November LCD TV
32LD350
This section of the manual will discuss the specifications of the 32LD350 LCD Direct View Display 9
November LCD TV
32LD350
Key TV Features • High Definition Resolution • , : ynam c on ras a o • Picture Wizard II (Easy Picture Calibration) • Smart Energy Saving • AV Mode (Cinema, Sports, Game) • Clear Voice II • • 24P Real Cinema • 2 HDMI™ 1.3 Inputs • onnec v y • Dolby® Digital 5.1 Decoder • Infinite Sound 10
November LCD TV
32LD350
HD RESOLUTION 720 HD Resolution Pixels: 1365 H × 768 V High definition television is the highest performance segment of the DTV system used in the US. It’s a wide screen, high-resolution video image, coupled with multi-channel, compact-disc quality sound.
Get easy self-calibration with on-screen reference points for key picture quality elements such as black level, color, tint, sharpness and backlight levels. Take the guesswork out of picture adjustments with this simple-to-use feature. It's not actually magic, but it will sure seem that way. Save Energy, Save Money It reduces the television display’s power consumption. requirements and is adjusted to the comfortable level to be viewed at home.
Clear Voice Clearer dialogue sound Automatically enhances and amplifies the sound of the human voice frequency range to provide high-quality dialogue when background no se swe s.
11
November LCD TV
32LD350
With AV Mode, you can easily select from one of three picture modes for “Cinema,” “S orts,” or “Games” to en o an o timized icture and sound experience. Enjoy a true cinema-like experience in your own home with movies the way they are meant to be seen. LG's Real Cinema technology displays 24p source rames LG’s ISFccc Ready HDTVs contain the detailed standards necessary for professional calibration of brightness, contrast, tint, sharp ness, color levels and much more to meet local li htin conditions for both da and ni httime viewin . Settings are added to preset modes for easy access from your LG remote. HDMI (High-Definition Multimedia Interface) is a compact audio/video interface for transmitting uncompressed digital data. LG SimLink is a brand specific type of HDMI CEC which allows you to control multiple HDMI components through a single television remote. , , produces 5.1-channel surround sound at the movies and in your home theater. To see it real is to hear it real. LG's Infinite Sound, which is tuned by the wellknown sound specialist Mr. Mark Levinson, enhancements your y High g definition TV experience with maximum surround sound. 12
November LCD TV
32LD350
BOTTOM PORTION TOP PORTION
p/n AKB72915206
13
November LCD TV
32LD350
To access the Service Menu. 1 You must have either Service Remote. p/n 105-201M or p/n MKJ39170828 2) Press “In-Start” 3) A Password screen appears. 4 Enter the Password.
Note: A Password is required to enter the Service Menu. Enter 0000 Note: If 0000 does not work use 0413.
MKJ39170828
105-201M
14
November LCD TV
32LD350
USB for Software Upgrades, Music and Photos
Side In/Out
USB 1
HDMI 2
Head Phones
MAIN BOARD Rear and Side Input/Output locations
Component
15
November LCD TV
32LD350
Currently Installed Version
1) Create an LG_DTV folder on the USB Flash Drive
Software Version found on the USB Flash
File found on the USB Flash Drive
2) Copy new software (xxx.epk) to "LG_DTV" folder. Make sure to have correct software file. , . 4) You can see the message “TV Software Upgrade” (See figure to right) 5) Cursor left and highlight "START" Button and push “Enter” button using the remote control. 6) You can see the download progress Bar. 7) Do not unplug until unit has automatically restarted. 8) When download is completed, you will see “ ”. 9) Your TV will be restarted automatically.
* CAUTION: Do not remove AC power or the USB Flash Drive. Do not turn off Power, during the upgrade process. Software Files are available from the GSFS or GCSC web sites. 16
November LCD TV
32LD350
1) Place Television on a digital channel.
4) Cursor Left to only highlight the briefcase .
2) Bring up the Customer’s Menu and highlight Options
3) The Option Menu appears 5) Press the (1) Key 5 to 8 times.
See next page for more details.
17
November LCD TV
32LD350
Understanding the Host Diagnostic Screen (Page 2 of 2)
Channel Selected
Host Diagnostics
Channel Info : Digital 19-2
Host Information
Blocked or not Blocked
Parental Control : Channel is not blocked
Model Name : 32LD350-UB (Liquid Crystal Display) Memory
DVI/HDMI Status
FLASH : 16384 KB
Can’t display this information now
DRAM : 131072 KB NVM : 64 KB Host Release Version Firmware Version(MP) : 3.05.00(0.1.58.22)
Software Version
Micom Version : 3.02 Compile Date & Time : 20100126 & 08:56:56 Compile User : jh.jung
Channel Frequency
FAT Status (Main) Center Frequency : 663.00 MHz Program Clock Reference (Locked or No)
PCR lock : Locked
Modulation mode : QAM 256 Carrier lock status : Locked SNR : 36 dB
Channel Type (8VSB, QAM 64, 256) 8VSB (Above 20 is good) QAM 64 (Above 24 is good) QAM 256 (Above 30 is good)
Channel (Locked or No)
Channel Signal to Noise Ratio
Signal level : 99 dBmV
Channel Signal Level (Above 80dBmV good)
Current Channel (Main)
Half Page
CH
18
Move Page
Exit
November 2010
32LD350
LCD-DV
1) Press “ADJ” key on the Service Remote.
2) Scroll down to Item 8 “EDID D/L” and press the Select Key.
3) Opening EDID D/L screen appears.
Continue on next page.
19
November LCD TV
32LD350
4) Highlight “Reset” then press “Select” key. Erasing begins.
6) Highlight “Start” then press “ ” . .
5) After Erasing, EDID now indicates “NG”.
7) After Writing completes, “ ”.
20
November LCD TV
32LD350
32LD350 Product Dimensions 31-1/2"
Wattage AVG: 110W STBY: <1W
2-7/8"
800mm
73.66mm
11-3/4" 298mm
7-7/8"
6-5/16"
200mm
160mm
Model No. Serial No.
3-15/16"
Side Label
100mm
22-3/16" Center
563.88mm 20" 508mm
10"
11 1/8"
254mm
281.78mm
Remove 4 screws to remove stand for wall mount
2-3/16" 55.56mm
8-1/8"
Weight without Stand: 24.3 lb Weight with Stand: 27.6 lb
15-3/4"
205.74mm
400mm
21
November 2010
32LD350
LCD-DV
Disassembly: This section of the manual will discuss Disassembly, Layout (Circuit Board Identification) of the 32LD350 LCD Direct View Television. Upon completion of this section the Technician will have a better understandin of the disassembl rocedures the la out of the rinted circuit boards and be able to identify each board.
22
November LCD TV
32LD350
Remove the 20 screws indicated. Pay attention to e s ze an ype of screw as there are many different types.
Putting in an improper screw when reassembling may Cause damage.
Stand Base is Glass Handle with Care The Stand does not have to be removed before removing the back.
23
November LCD TV
32LD350
Clips hold front frame in place, use caution. Suggest adding screw while servicing.
Panel Interface Board
Ballast
Warning: The Frame may have sharp edges
LVDS Cable
ower upp y (SMPS)
an
oar
Keyboard AC Input
Board
Speaker Right
Speaker Left
24
November LCD TV
32LD350
32LD350 Connector Identification Diagram Panel Board
TFT PANEL AUSWLJR, AUSDLFR, p/n: EAJ60890301 AUSDLJR, AUSDLUR, CUSDLH
Panel Interface
If the Panel is replaced, reset the UTTTime. Service Menu, System Item 18
p/n: EAJ60870501 CUSWLH, CUSWLHO
Ballast P203
P201
POWER SUPPLY
CN1
P402
SMPS Used in the 32LD350: EAY60868901 32LD350 AUSWLJR or AUSDLFR or AUSDLUR or AUSDLJR
P802
Main Boards Used in the 32LD350: EBU60850009 32LD350 AUSWLJR and AUSDLFR EBR66049702 32LD350 AUSDLJR EBU60850010 32LD350 AUSDLUR EBU60850003 32LD350 CUSDLH EBU61005102 32LD350 CUSWLH and CUSWLHO
EAY60869101 32LD350 CUSWLH or CUSDLH or CUSWLHO
Key Board p / n : E B R 6 5 8 6 3 6 0 2
MAIN BOARD
SK100
P600
P2401
AC In J2
P3000
J1
IR p/n: EBR64965302
Speaker (Front Right)
Speaker (Front Left)
p/n: EAB60961401
p/n: EAB60961401
25
November 2010
32LD350
LCD-DV
p/n EAY60868901 P201
Disconnect P201, P203 and AC In SK100.
Press in gently on the two tabs to release lock SMPS Used in the 32LD350: EAY60868901 32LD350 AUSWLJR or AUSDLFR or AUSDLUR or AUSDLJR
Remove the 4 screws indicated by the arrows.
SK100
CUSWLH or CUSDLH or CUSWLHO
AC In
26
November LCD TV
32LD350
Press inward on the two locking tabs and pull the connector out.
p/n EBU60850009
Flip the locking tab upward, pull the LVDS ribbon out.
P402
Disconnect P402, P802, P600, and P2401
P802 Remove any tape holding down any cables. Remove the 4 screws indicated by the arrows.
Remove decorative plastic and remove the board.
N/C
Decorative Metal Plate
N/C
P600 NOTE: Always check on top and behind the Large ICs. And look for a piece of Chocolate (Heat Transfer Material). Be sure to transfer to .
After removing the Main, there are tabs sticking through the Main board holding the Metal plate in place.
P2401
Main Boards Used in the 32LD350: EBU60850009 32LD350 AUSWLJR and AUSDLFR EBR66049702 32LD350 AUSDLJR EBU60850010 32LD350 AUSDLUR EBU60850003 32LD350 CUSDLH EBU61005102 32LD350 CUSWLH and CUSWLHO
27
November LCD TV
32LD350
Ballast comes with the Panel
Remove the 6 screws indicated by the arrows. Remove the Inverter Cover.
Disconnect CN1.
,
.
NOTE: If Servicing the Board, return the screws to provide stability and grounding. CN1 Lift the Board up slightly on the right side and slide the board to the right to release the board from the Backlight connectors.
Backlight connector
28
November LCD TV
32LD350
Cushion pieces behind the Inverter
NOTE: After removing the Inverter, pay Inverter. Make sure to return them to there correct positions if they should fall or pull off with the board.
Connectors to the Backlights. The Inverter board slides into these connectors.
Cushion pieces behind the Inverter
29
November LCD TV
32LD350
p/n EBR64965302 Disconnect J1 and J2 connectors. Remove the 1 screw and pull the board forward.
J2
30
November LCD TV
32LD350
Troubleshootin : This section of the manual will discuss troubleshooting.
a better understanding of how to diagnosis and resolve problems.
31
November LCD TV
32LD350
This switch mode power supply develops Stand By 3.5V At power on, it develops 12V and 24V for the Main board And 24V for the Ballast. This power supply draws less than 1 watt during stand by mode. The fuse F501 reads 0V (from hot ground) during this time. When the controller chip receives the POWER-ON . , on. The Primary fuse F501 now reads 388V. P201 Connector: (To Main Board) 12V is routed out P201 pins 17, 19 and 21 and 24V is routed out P201 pins 2, 3 and 4. P203 Connector: (To the Ballast) 24V is routed out P204 pins 1 through 5. Other SMPS Used in the 32LD350: EAY60868901 32LD350 AUSWLJR or AUSDLFR or AUSDLUR or AUSDLJR
32LD350 CUSWLH or CUSDLH or CUSWLHO
32
November LCD TV
32LD350
p/n EAY60868901
Cold Gnd Hot Gnd
3.15A/250V STBY 0V Run 388V From Hot Gnd
F100
Hot Ground Shock Hazard
AC Protect
33
November LCD TV
32LD350
32LD350 Television Start Up Sequence Primary side fuse: Stand-By 0V Run 390V
AC In
Bridge
Relay
1 5 Rectifier
Stand By 3.5V Reg
No AC Det in this model
5
5
5
7
T-CON Inside Panel 12V LVDS Along with Video On LVDS cable
7
6
12V
8
8
2
P o w e r O n
+3.3V_AVDD _MPLL IC400
1.8V_AMP IC601
5V_Normal Switch IC406
IC103 Q108
3
12V
3.3V_Normal Switch IC405
RL_ON
PWR_On/ Off_1
5
12V Switch Q409
LVDS Video
Variable by Cust Menu for Backlight And Picture Content
6
7
5 2
PWM-DIM Digital Dimming Manipulates Backlight Brightness
Q405
5V_USB IC401
Inverter On Starts the Ballast. Backlights Light. Manipulates Backlights
Audio_AMP IC600 Q401
INV On
T o B a c k l i g h t s
8
INV On
5
7
BR1 Fixed Analog Dimming
24V
5
BALLAST 24V 24V B+ for the Ballast
Q402
MAIN BOARD
Reset of Main Board
24V Regulator
12V/24V Regulators
POWER _ON
2
5
POWER SUPPLY (SMPS)
12V
Stand By 3.5V At point 3 TV is in Stand-By state. Energy Star compliant. Less than 1 Watt
S e c o n d a r y
P r i m a r y
Inv On/Off LVDS Panel Control
Mstar Microprocessor IC100 Also Video Processor
4
34
Ft Control
Power Button Or Remote Key
November 2010
32LD350 3D-LCD
Note: When AC is applied, the SMPS “MUST” be producing STBY 3.5V on pins 9, 10, 11 or 12 of P201. If 3.5V Standby is not being generated, make sure AC is arriving at the connector SK101. If it is, the SMPS is defective and must be replaced. There is no need to continue with the . AC Should not be applied at any time while adding jumper or While unplugging connectors as damage to the circuit Board may occur. (b) Unplug P402 on the Main Board to make insertion of the Jumpers easier. Use P402 Side to insert resistors
Pin 1 is the Brown Wire
TEST PROCEDURE: (A) Add a jumper between (3.5V STBY) pin 7, 8, 9 or 10 and Pin 1 (PWR_ON). Apply AC. This will turn on the power supply, relays will click. a) Check that the 24V and 12V power supplies are turned on, , , The Backlights should turn on at this point. If the 24V and the Inverter On command is arriving at the Ballast, but no backlights, then see Ballast Section for further testing. (B) Remove AC power and Remove Jumper. SMPS and Ballast are OK.
36
November LCD TV
32LD350
Press in gently on the two tabs to release lock P201
P201 Connector “SMPS” to “Main” P402 Pin 1
Label (1)
PWR-ON
STBY
Run
Diode Check
0V
3.28V
1.16V
Odd pins are on the left.
2-4
24V
0V
24.19V
0.73V
5-8
GND
Gnd
Gnd
Gnd
9-12
3.5V
3.41V
3.41V
Open
13-15
Gnd
Gnd
Gnd
Gnd
nc
nc
nc
pen
12V
0V
11.97V
Open
0V
3.32V
Open
0V
11.97V
Open
0V
0V
Open
0V
11.97V
Open
A-DIM
0.3V
4.49V
Open
(4) A-DIM Pin 22 (To P203 pin 13 Silk Screened P WM-DIM) Is not used.
PWM-DIM
0V
0.65V~3.25V
Open
(5) PWM-DIM Pin 24 (To P203 pin 14 Silk Screened Error_Out) can vary according to incoming video IRE level and OSD Backlight setting Output from the Video Processor IC100. Range 0.65V to 3.25V.
17 18
(2)
INV-ON
19 20
12V (3)
ERROR
21
12V (4)
22
24
(5)
Diode Mode values taken with all Connectors Removed
(1) PWR_ON Pin 1 Turns on 12V, 24V to the Main and 24V to the Inverter P203 Pins 1~5. 1~5 (2) INV_ON Pin 18 (To P203 pin 12) Turns on the Backlights. (3) Error Pin 20 (From P203 pin 11 Silk Screened A-DIM) Goes high g when the backlights g are told to come on. Goes back low when they come on. If it goes high again on the 5th attempt to fire the backlights, the set shuts off.
37
November LCD TV
32LD350
P203 P203 "SMPS" to CN1 “Ballast" Pin
Label
STBY
Run
Diode Check
1-5
24V
0V
24.19V
0.73V
ERROR
0V
0.59V
Open
INV_ON
0V
3.31V
Open
A-DIM
n/c
4.5V
Open
P-DIM
0V
0.65V~3.25V
Open
11 12 13 14
(1)
(2)
(3)
(4)
1
(1) Error Pin 11 (To P201 pin 20 Silk Screened A-DIM) Goes high when the backlights are told to come on. Goes back low when they come on. If it goes high again on the 5th attempt to fire the backlights, the set shuts off. (2) INV_ON Pin 12 (From P201 pin 18) Turns on the Backlights. (3) A-DIM Pin 13 (From P201 pin 22 Silk Screened P WM-DIM) Is not used. (4) PWM-DIM Pin 14 (From P201 pin 24 Silk Screened Error_Out) can vary according to incoming video IRE level and OSD Backlight setting Output from the Video Processor IC100. Range 0.65V to 3.25V.
Diode Mode values taken with all Connectors Removed
38
November LCD TV
32LD350
SK100 "SMPS" to AC IN Label L N
STBY
Run
Diode Check OL
120Vac
OL
F501 Bottom Left of SMPS
F100 F100 5A/250V AC IN
F501 3.15A/250V L
N From Hot Gnd STBY 0V Run 388V
L
SK100
rea ng t e vo tage on r g t a ter power off, it takes a very long time to bleed down to the reading given here.
F100 (Diode Check) Red or Black Lead on Fuse (Open) Other Lead on Hot Ground Diode Mode values taken with all Connectors Removed
39
November LCD TV
32LD350
The Ballast receives 24V from the SMPS on CN1 pins 1~5. The Inverter On (INV ON) command arrivin on CN1 in 12 starts the Ballast drive si nals, 120Hz . P-DIM is delivered from the Main board through the SMPS to the Inverter on CN1 pin 14. The Ballast responsible for delivering approx. 1.2kV to each of the 8 Cold Cathode Florescent bulbs. This is accomplished by 8 step-up transformers, 1 for each lamp.
Cover On
Cover Off
40
November LCD TV
32LD350
Top Half
Bottom Half
CN1
24V Fuse
41
November LCD TV
32LD350
Q110 Q104 Q106 Q108 Pin 1 Pin 2 Pin 3
Pin 3 at 2MSec per/div
Gnd 9.03V 4.58V
Q103 Q107 Pin 1 Pin 2 Pin 3
Pin 2 at 2MSec per/div
Q101, 3, 4, 6, 7, 8, 9, 10 confi urations are the same. 12.74V p/p 80% PWM-DIM
28.92V p/p 80% PWM-DIM
Pin 2 at 2MSec per/div
Pin 3 at 2MSec per/div
1 3 2
24.16V 9.03V 0V pp
-
.
pp
-
Checking T103 ~ T110
U1 n Pin 2 Pin 3
Gnd 24.07V
Warning: Pin 4 has 1.2Kv p/p
43
November LCD TV
32LD350
44
November LCD TV
32LD350
Center Right of the Board Just under CN1 Connector
Inverter (Main)
CN1
o e o e ec Open (Red Lead on Fuse) 0.9V (Black Lead on Fuse)
7A
45
November LCD TV
32LD350
46
November LCD TV
32LD350
CN1 "Inverter Main" Connector To P203 "SMPS" Pin
Label (1)
14
P-DIM
STBY
Run
Diode Check
0V
0.65V~3.25V
Open
12 11
INV_ON (3)
ERROR
.
Not Used
pen
0V
3.31V
Open
0V
0.59V
Open
0V
24.19V
Open
Inverter On Control
~ 1
1~5
24V
(1) P-DIM
Pin 14. PWM_DIM can vary according to OSD Backlight setting and the incoming video IRE level. PWM-DIM is Output from the Video Processor IC100. Range 0.65V to 3.25V. (2) A-DIM
Pin 13. Not Used
(3) ERROR
Pin 11. Normal low. Goes high when the Backlights are told to turn on by INV_ON. After backlights fire, go back low. Will repeat 5 times then shut off the set. Diode Mode values taken with all Connectors Removed
47
November LCD TV
32LD350
The Main board receives its operational B+ from the Power Supply via P402. There is only one LVDS cable that feeds to a Panel Interface board. The LVDS cable feeds 10 bit . been prepared for the Panel’s H and V boards. This is done in the panel itself. The Main board also includes the Tuner, Audio and Audio/Video inputs and selection circuits. Input Voltages from SMPS. •
STBY 3.5V (P402 pins 9~12)
• •
12V pins 13 and 14 24V pins 17, 19 and 21.
The Main board also develops several B+ sources on the board. STAND-BY VOLTAGES 3.3V_ST (Voltage direct from SMPS)
GENERAL 5V_Normal (From 12V from SMPS) 5V_EXT LVDS 5V USB (From 12V from SMPS) Panel_VCC (12V Not generated, but switched rom e arr v ng rom e . 1.8V (Made from 3.3V_Normal) TUNER and VSB CIRCUIT 24V (From Power Supply) 5V_TU (Made from 5V_Normal) •
• • •
•
• •
• • • • •
3.3V_TU (Made from 3.3V_Normal) 1.26V Made from the 3.3V_ TU +1.2V_PVSB (Made from 3.3V_TU) +3.3V_PVSB (Made from 3.3V_TU)
MStar IC100 Video Processors 1.2V, D1.5V, D1.8V_DDR, 1.26V_VDDP, 3.3V_VDDP, +3.3V_AVDD_MPLL •
WIRELESS VOLTAGES •
•
•
48
3.3V_VCC, -5V_VGL, 27V_VGH, 16V_VDD and HVDD (7.8V) November LCD TV
32LD350
See next page for component identification
VIDEO PROCESSOR IC100 runs Hot. This is normal.
P402 To SMPS
P802 To Panel Interface
USB IC100 HDMI
Headphones RS232 HDMI PC
PC Optical Audio Audio TUNER
P600 To Speakers
P2401 To Front IR
Side Composite Inputs
EBU60850003 32LD350 CUSDLH (The one shown) EBU60850009 32LD350 AUSWLJR and AUSDLFR EBU60850010 32LD350 AUSDLUR EBU61005102 32LD350 CUSWLH and CUSWLHO
49
Nov No vem embe berr LCD LCD TV
32L 2LD3 D35 50
32LD350 Main Component Layout (Front View) L415
P802
IC403
IC401 IC407
P402
IC2 L423
SW100 Microprocessor Reset
L406
IC105
IC1000
MAIN BOARD p/n: EBU60850003
L422 IC1450
IC1
IC406
IC100 Mstar Micro and Video Processor
L421
IC101 Q100 C
E
USB1
B
HDMI
IC1004
IC405
Q7702 X100 D7705 A1 A2
IC600
X1005
E
C
Headphone C
Q1100
12MHz
C B
C
C
E
B
E
Q1105 JK7700 L607
B
L606
JK1104
JK1102
JK1103
JK9800
D1100
25MHz
C
B
E C
B
E
Q1103
A2 A1
Digital Video 18. IF p 17. IF n 16. IF AGC 15. Reset TUNER 14. 3.3V TDVJ-H001F 13. 1.26V 12. GND Analog Video 11. CVBS 10. NC Audio 9. SIF
Tuner Data Tuner Clock
P600
Q1104
Tuner B+
8. NC 7. SDA 6. SCL 5. NC 4. NC 3. 5V
IC5001 3 2
2 1
S I D E A / V
2. NC 1. NC
R-R+L-L+
P2401 Main Boards Used in the 32LD350: EBU60850009 32LD350 AUSWLJR and AUSDLFR EBR66049702 32LD350 AUSDLJR EBU60850010 32LD350 AUSDLUR
Main Boards Used in the 32LD350: EBU60850003 32LD350 CUSDLH EBU61005102 32LD350 CUSWLH and CUSWLHO
50
November 2010
32LD350
LCD-DV
32LD350 Main (Front Side) Component Voltages Serial Flash Memory 0.05V 3.28V 2.26V 0V (Gnd) 0V 0V 3.28V (B+) 3. 3.28V (B+)
IC403
Pin [1] [2] [3] [4] [5] [6] [7] [8]
HDCP EEPROM 0V (Gnd) 0V (Gnd) 3.3V (B+) 0V (Gnd) 0V 3.3V 0V (Gnd) 3.28V (B+)
IC405
Pin [1] [2] [3] [4] [5] [6] [7] [8]
5V Regulator for USB 11.9V (In) 5.09V (Out) 5.09V (Out) 0V (Gnd) 3.25V (PW R On/Off1) 0.8V 5.05V 0V (Gnd)
IC406
Pin [1] [2] [3] [4] [5] [6] [7] [8]
IC101
IC105
IC401
Q7702
Pin B 0.63V C 0V E Gnd
HDMI 4 Det
D1100
(+1.26V_VDDC) Regulator 0.79V 0V (Gnd) 3.37V (In) 4.47V 3.34V 1.3V (Out) 1.3V (Out) 2. 2.96V (PW R On/Off2_1)
IC407
Pin [1] [2] [3] [4] [5] [6] [7] [8]
(+3.3V_NORMAL) Regulator 0V (Gnd) 11.92V (In) 0V (Gnd) 0.8V 0.84V 2.39V (PW R On/Off1) 3.35V (Out) 3.35V (Out)
IC1000
Pin [1] [2] [3] [4] [5] [6] [7] [8]
(+5V_NORMAL) Regulator 0V (Gnd) 11.92V (In) 0V (Gnd) 0.8V 0.84V 2.39V (PW R On/Off1) 4.98V (Out) 4.98V (Out)
IC1450
Pin [1] [2] [3] [4] [5] [6] [7] [8]
0.8V 0V (Gnd) 3.38V 4.79V 3.35V 1.76V (Out) 1.76V (Out) 2. 2.36V (PW R On/Off1)
Pin [1] [2] [3] [4] [5] [6] [7] [8]
(+1.2V_PVSB) Regulator n/c 3.26V (Enable) 3.26V (In) n/c n/c 1.81V (Out) 1.21V n/c
Pin [1] [2] [3] [4] [5] [6] [7] [8]
5V Routing Pin for IC1100 [A1] 0.07V [A2] 4.98V [C] 4.37V
D7705
51
(D1.8V) Regulator
Pin [1] [2] [3] [4] [5] [6] [7] [8]
5V Shot Protection for USB 0V (Gnd) 5V (In) 5V (In) 0V (USB-Ctl)
IC5001
(+1.26V) for Tuner Pin Regulator [1] 3.3V (In) [2] 1.26V (Out) [3] 0V (Gnd)
Q100
Write Protect for Pin IC101 B 0V C 3. 3.3V E Gnd
Q1100
Earphone Mute Pin 1st Driver B 0V C 2.26V E Gnd
Q1103-4
EARPHONE Pin MUTE B 0V C 0V E Gnd
Q1105
Earphone Mute Pin 2nd Driver B 0.63V C 0V E Gnd
5V (Out) 5V (Out) n/c
5V Routing Pin for IC7701 [A1] 0V [A2] 4.98V [C] 4.71V
November 2010
32LD350
LCD-DV
32LD350 Main Component (Back Side) Layout Layout Q407 Q406 B E
B C
E C S
G
Q409
D
3
Q402
C 2
Q405 B
1 C
Q401
B
E
E 3
2
IC103
1
IC408
2
1
3
IC104 In
IC7702
Gnd
IC102
Gnd
IC400
Out 3
1 2
D7706
IC601
A2 A1
2
C A1 A2
D7703 Q1101 Q1102
C C
IC1100
E
C DS
B
B E
E
B
B
A2
C
E G
D102
C
A1
C
Q600
B
Q7701 Q7703 IC7701
Q5004 C B
IC1201
E
IC1104 IC1105 A1 A2
D1115
C
E
Q2405
52
BE
C
November 2010
C
B
Q2406
32LD350
LCD-DV
32LD350 Main (Back Side) Component Voltages
IC103
Reset Pin Generator [1] Gnd [2] 0V [3] 3.39V
IC104
Pin [1] [2] [3] [4] [5] [6] [7] [8] IC400
IC408
IC601
Q406
EEPROM Mstar 0V (Gnd) 0V (Gnd) 0V (Gnd) 0V (Gnd) 3.31V 3.31V 0V (Gnd) 3.31V
+3.3V_AVDD_MPLL) Pin Regulator [In] 3.35V [Gnd] Gnd [Out] 3.34V
IC1100
PANEL_VCC Pin Control 1st Driver B 0.05V C 0.68V E Gnd
Earphone Amp 2.14V 0V (Gnd) 0.02V 2.19V 2.19V 4.37V 2.19V 2.18V
Pin [1] [2] [3] [4] [5]
Optical Audio Amp 1.64V 3.29V 0V (Gnd) 0V (Gnd) 3.29V
Pin [1] [2] [3] [4] [5] [6] [7] [8]
EDID Data PC 0V (Gnd) 0V (Gnd) 0V (Gnd) 0V (Gnd) 4.7V 4.7V 4.7V 4.7V
IC1104
IC1105
Power_Det Pin 24V, 12V, 3.5V [1] 3.52V [2] 3.35V [3] Gnd (+1.8V_Amp) Pin Regulator [1] Gnd [2] 1.81V [3] 3.31V
Pin [1] [2] [3] [4] [5] [6] [7] [8]
Q407
PANEL_VCC Pin Control 2nd Driver B 0.68V C 0V E Gnd
D102
Pin [A1] 0V [A2] 0V [C] 0V
Mute Routing
IC1201
Pin [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]
RS232 Data Buffer 3.34V 3.48V 0V 0V (-5.37V) 5.39V (-5.37V) n/c (0V) n/c (3.39V) n/c (3.35V) n/c (0V) 3.35V 0V 5.47V 0V (Gnd) 3.37V
Pin [1] [2] [3] [4] [5] [6] [7] [8]
EDID Data HDMI2 0V (Gnd) 0V (Gnd) 0V (Gnd) 0V (Gnd) 4.7V 4.7V 4.7V 4.7V
IC7701
Q409
D1115
PANEL_VCC Pin Switch S 11.97V (In) G 1.84V (Enable) D 11.97V (Out) 5V Routing Pin for IC7705 [A1] 0.03V [A2] 0V [C] 4.69V
53
IC7702
Pin [1] [2] [3] [4] [5] [6] [7] [8] Q401
Q402
Q405
Q600
D7703
EDID Data HDMI4 0V (Gnd) 0V (Gnd) 0V (Gnd) 0V (Gnd) 4.69V 4.69V 4.69V 4.69V
Power On/Off Pin Driver for Q402 B 0.64V C 0V E Gnd Power On/Off Pin Switch 1 3.39V (In) 2 0.89V (Ctl) 3 3.28V (Out) Inverter On/Off Pin Switch B 0.06V C 3.32V E Gnd
Q1101-2
EARPHONE Pin MUTE B 0V C 0V E Gnd
Q2405
IR Buffer Pin 1st Driver B 0.6V C 0V E Gnd
Q2406
IR Buffer Pin 2nd Driver B 0V C 3.3V E Gnd
Q5004
Tuner SIF Pin (Sound) Buffer B 0.163 C Gnd E 0.85V
Q7701
Pin B 0.63V C 0V E Gnd
AMP_MUTE Pin Pin 25 IC600 B 0.08V C 3.35V E Gnd
Q7703
3.5V Blocking Pin for Q7703 [A1] 0V [A2] 3.37V [C] 3.3V
D7706
Pin [B] [G] [S] [D]
HDMI 2 Det
CEC Remote HDMI CEC 3.39V 3.32V 0V 3.26V
5V Routing Pin for IC7702 [A1] 4.98V [A2] 0V [C] 4.69V
November 2010
32LD350
LCD-DV
IC100 Micro/Video Processor Cr stal
IC1004 VSB QAM Demodulator
X1005
X100 Runs all
12Mhz
Runs only
25Mhz
is on
3.61V p/p
3.64V p/p
2.91V p/p
X100
4.59V p/p
X1005
MAIN Board
54
November LCD TV
32LD350
P402
P402 “Main Board" to P201 “SMPS" Pin 1
Odd Pins are Top Row
Label (1)
PWR-ON
STBY
Run
Diode Check
0V
3.28V
1.16V
2-4
24V
0V
24.19V
0.73V
5-8
Gnd
Gnd
Gnd
Gnd
9-12
3.5V
3.41V
3.40V
Open
13-15
Gnd
Gnd
Gnd
Gnd
(2) INV-On Pin 18: Turns on the Backlights
16
n/c
n/c
n/c
Open
17
12V
0V
11.96V
Open
(3) Error_Out Pin 20: (Silk Screened A-DIM) Goes high (3.3V) when the backlights are told to come on. oes ac ow w en ey g . If it goes high again on the 5th attempt to fire the backlights, the set shuts off.
18
0V
3.32V
Open
0V
11.96V
Open
(1) PWR-On Pin 1: Turns on 12V, 24V to the Main and 24V to the Inverter P203 Pins 1~5.
(2)
19
12V
. 21
12V (4)
22 (4) A-DIM Pin 22: -
.
23 (5)
24 (5) P-DIM Pin 24 (Silk Screened Error_Out) can vary according to incoming video IRE level and OSD Backlight setting Output from the Video Processor IC100. Range 0.65V to 3.25V.
INV-ON
pen
0V
11.96V
Open
0.3V
4.49V
Open
n/c
n/c
n/c
Open
P-DIM
0V
0.65V~3.25V
Open
A-DIM
Diode Mode values taken with all Connectors Removed
55
November LCD TV
32LD350
To the Panel Interface Board Location: Top Right of Board
12V_LVDS Pins 27~30
ote:
e ane as an a t ona oar t at sets on top an ta es t e 12V to generate the 5 usable voltages for the Panel.
56
November LCD TV
32LD350
represent the 10 bit Differential Pair LVDS Signal. All waveforms shown are the (+) part of the differential pair. The (-) part is exactly the same only . All waveforms are at the same 5uSec per/div rate and 100Mv per/div.
57
November LCD TV
32LD350
P802 Connector “Main" to the “Panel Interface“
There are no Stand-By Voltages for the Connector Diode Mode values taken with all Connectors Removed
Pin
Label
Run
Diode Check
Pin
Label
Run
Diode Check
1
Gnd
Gnd
Gnd
16
TXA1-
0.79V
Gnd
2
Gnd
Gnd
Gnd
17
Gnd
Gnd
Gnd
3
N/C
n/c
n/c
18
TXA0+
0.79V
Gnd
4
N/C
n/c
n/c
19
TXA0-
0.79V
1.06V
6
TXA3+
1.14V
0.79V
21
N/C
n/c
n/c
7
TXA3-
1.34V
0.79V
22
LVDS_Sel
2.42
Open
8
Gnd
Gnd
Gnd
23
Gnd
Gnd
Gnd
9
TXAC+
1.25V
0.79V
24
Gnd
Gnd
Gnd
10
TXAC-
1.2V
0.79V
25
Gnd
Gnd
Gnd
11
Gnd
Gnd
Gnd
26
Gnd
Gnd
Gnd
12
TXA2+
1.16V
0.79V
27
Panel_VCC
11.97V
2.59V
13
TXA2-
1.35V
0.79V
28
Panel_VCC
11.97V
2.59V
14
Gnd
Gnd
Gnd
29
Panel_VCC
11.97V
2.59V
.
.
_
58
.
November LCD TV
.
32LD350
P2401
P2401 Connector "MAIN Board" To J1 "IR Board" Pin
Label
STBY
Run
Diode Check
1
(1)
SCL
0V
0V
Open
2
(1)
SDA
0V
0V
Open
3
Gnd
Gnd
Gnd
Gnd
4
KEY 1
3.4V
3.39V
1.52V
5
KEY 2
3.4V
3.39V
1.52V
6
3.5V_ST
3.41V
3.39V
0.9V
7
Gnd
Gnd
Gnd
Gnd
8
LED_B
0V
0V
2.3V
.
pen
10
Gnd
Gnd
Gnd
Gnd
11
+3.3V_Normal
0.02V
3.3V
0.58V
_ (1) (2)
1
.
.
No Clock or Data pulses IR pulses (1.6V p/p)
Diode Mode values taken with all Connectors Removed
59
November LCD TV
32LD350
Q600 (Mute) on back side of the board just above IC600 is Active Low. Normal 3.35V Collector to Pin 25
Use speaker out to test for defective Audio Amp IC600 Note: Normal ½ Audio B+ P600 CONNECTOR "Main" to "Speakers" Pin
LABEL -
SBY
Run
Diode Check
1.8V_Amp Pin 16
Mute Pin 25
Audio B+ 24.17V Pins 32-35
IC600
Audio B+ 24.17V Pins 49-52
.
-
2
SPK-R(+)
0V
12.95V
Open
3
SPK-L(-)
0V
12.95V
Open
4
SPK-L(+)
0V
12.95V
Open
Diode Mode values taken with all Connectors Removed
P600
Circuit Location on the Main Board
R- R+
60
L- L+
November LCD TV
32LD350
The IR board (located on the bottom left as viewed from the rear) contains the IR (Infrared) Remote Sensor and Power LEDs. This board also connects to the Key Board.
The IR board receives it operating B+ via J1 pin 6 (STBY 3.5V). The IR (Infrared) remote receiver can be measured (2V) at pin 9 of connector J1 or P2401 on the Main board in Stand-By. During run pin 9 reads (1.98V). . (IC100) via pin C4. The Front Power LEDs are controlled by pins 8 (Blue LED) and 12 (Red LED) of J1. e ey oar s rou e o e oar v a an ou pu on ey an ey (Key 1 pin 4 and Key 2 pin 5). Arriving at P2401 pins 4 and 5 on the Main Board. Then to the Microprocessor Pins A4 and B4.
61
nes,
November LCD TV
32LD350
p/n EBR64965302
Key Board P3000
To Main Board J1
62
November LCD TV
32LD350
p/n EBR64965302
IR board
IR Receiver Diode Check B indicates Black Lead IR Center Leg Ground
(2.8V) R Gnd R (2.34V) (0.68V) B Gnd B (0.65V)
Power LEDs
63
November LCD TV
32LD350
J1 "Front IR" to P4201 " MAIN" Pin
Label
J2 "Front IR" to “ Key Board"
STBY
Run
Diode Check
Pin
Label
STBY
Run
Diode Check
1
(1)
SCL
0V
0V
Open
1
KEY 1
3.4V
3.39V
Open
2
(1)
SDA
0V
0V
O en
2
Gnd
Gnd
Gnd
Gnd
3
Gnd
Gnd
Gnd
Gnd
3
KEY 2
3.4V
3.39V
Open
4
KEY 1
3.4V
3.39V
Open
4
Gnd
Gnd
Gnd
Gnd
5
KEY 2
3.4V
3.39V
Open
6
3.5V_ST
3.41V
3.39V
Open
7
Gnd
Gnd
Gnd
Gnd
8
LED_B
0V
0V
Open
2V
1.98V
Open
(2)
9
IR
10
Gnd
Gnd
Gnd
Gnd
11
+3.3V_Normal
0.02V
3.3V
Open
_ (1) (2)
.
pen
No Clock or Data pluses IR pulses (1.6V p/p)
Diode Mode values taken with all Connectors Removed
64
November LCD TV
32LD350
Key Board p/n: EBR65863602 The Ke board is routed to the IR board from P3000 to J3 and out ut on J1 Ke 1 and Ke 2 lines. Arriving at P2401 pins 4 and 5 on the Main Board. Then to the Microprocessor Pins A4 and B4. On P3000 (Key 1 is pin 1 and Key 2 is pin 3), Pins 2 and 4 are ground. Key 1 / 2 Voltage and Resistance Chart with buttons pressed. Label
Function
Resistance
Voltage
Ke 1
Vol +
17M
1.70V
Vol -
10M
1.09V
Menu
5.27M
0.52V
Enter
0.98M
0.10V
Label
Function
Resistance
Key 2
CH +
17M
1.70V
CH -
10M
1.09V
Power
5.27M
0.52V
Input
0.98M
0.10V
Voltage and Resistance taken with AC applied to the set. o u on presse es s ance is Open and Voltage is 3.4V. Diode Check on Key 1 and Key 2 is O en. Voltage with no key pressed 3.4V STBY and 3.39V RUN
Voltage
65
November LCD TV
32LD350
Speaker pn The 32LD350 contains the Invisible Speaker system. The Full Range Speakers point downward, so there is no front viewable speaker grill or air ports. It uses the dual split magnet style of thin profile speaker.
Installed
66
November LCD TV
32LD350
67
November LCD TV
32LD350
32LD350 LVDS P802 WAVEFORMS
Pin 6
5uSec per/div
Pin 7
625mV p/p
5uSec per/div
Pin 9
561mV p/p
Pin 10
5uSec per/div
548.5mV p/p
5uSec per/div
Clock (TXAC+)
Pin 13
5uSec per/div
Pin 15
535.6mV p/p
5uSec per/div
Pin 16
540.7mV p/p
5uSec per/div
Pin 12
565.1mV p/p
349.9mV p/p
Clock (TXAC-)
Pin 18
534.1mV p/p
5uSec per/div
5uSec per/div
32LD350 P802 LVDS CABLE WAVEFORMS: Waveforms taken using SMTP Color Bar input. All readings give the Scale 100mV and 5uSec per division Time Base related to scope settings.
Pin 19
583.9mV p/p
5uSec per/div
395mV p/p
