Descripción: Libro muy completo de reparacion LCD en ingles
Descrição: Libro muy completo de reparacion LCD en ingles
Libro muy completo de reparacion LCD en inglesDescription complète
wa
WIN8 click dr si TRAGI IN JOS apare all apps; Oct 23-24, 2006 Service Seminar CS Promotion Center Panasonic AVC Networks Company Contents 1. LCD Line-up for Y2006 2. Chassis Structure…Description complète
Algunas reparaciones de tv LCD comentadas
Descripción completa
LCD TV infoFull description
Algunas reparaciones de tv LCD comentadasDescripción completa
WIN8 click dr si TRAGI IN JOS apare all apps; Oct 23-24, 2006 Service Seminar CS Promotion Center Panasonic AVC Networks Company Contents 1. LCD Line-up for Y2006 2. Chassis Structure…Full description
Guia de reparacion de TV LCDFull description
Descripción: Guia de reparacion de TV LCD
AC-DC LCD TV Power Architecture and LED Backlight
LCD TV Power Architecture and LED Backlight •
LCD-TV Market – Power Reduction Trend – Edge LED LCD TV Backlight
•
26” to 42” H-V LIPS Reference Design
•
46/47” Power Reference (PSU) for any Backlight solution – Interleaved Frequency Clamp CrM PFC with NCP1631 – Quasi Resonance Valley lock out Flyback Converter with NCP1379 – ECO Standby SMPS Solution with NCP1053A
•
46/47” Backlight solution – LIPS Inverter – Edge LED Driver
•
Conclusion
LCD-TV Shipments by Size
Source: Displaysearch 2Q 09
Power Reduction Trend •
Regulatory reduce power consumption in active and standby mode
•
New technologies focused on improving efficiency
Source: Sharp
•
Proposed ENERGYSTAR TV regulations (V4.0) will lower average power targets
Power consumption reduction ~ - 50% over 2 years
Proposed ENERGY STAR rev4.0 Standards
Very few LCD-TV pass proposed new standard, most are Samsung LED
Target Effective Date: May 2010
LCD-TV LED Backlighting
Source: DisplaySearch July 2009
LED TVs is forecast to grow to 20-32% (~64 M#) by 2012
Comparison of LED LCD TV Backlight Options LED driver
Merit
Concerns
Edge-lit LED BLU
Direct-type LED BLU
High voltage Boost, buck, linear with Vf adjustment
Boost or Buck plus Multi-channel linear
• High Power Efficiency • Good system reliability independent LEDs performance. • Cost down of system • Slim LCD TV
• • • • •
• System Noise & EMI • Using lots of external components (Inductor, capacitor, diode)
• Thermal limitations • High system cost due to number of LEDs and # of Drivers • Picture artifacts
Edge LED > 90% ?
Deep blacks, better contrast Local dimming Scanning for higher frame rate Low power consumption Complex signal processing
Power Architectures Remain Varied Signal Power Flyback Resonant HB 30 – 80 W
PFC CRM Interleave FCCrM CCM 70 - 400+ W
ECO Standby <5W
Backlight Power Flyback / Resonant HB 24V / 150V+ for LED HV-LIPS for CCFL / EEFL 50 – 300 W
Traditional 24 V Backlight and HV-LIPS approach Thin TV design impacts solutions choices as well
32” HV-LIPS Reference Design • For 32” (highest volume size) with possible extension to 26/42” – Available since March 2009 – For CCFL ( >> 95% of backlight) with possible extension to EEFL – Single PCB with LCD and Inverter Power Supply
• Very Cost effective solution – No extra Standby SMPS – Straightforward CrM PFC
• Key ON Semiconductor ICs – NCP1607 as CrM PFC controller – NCP1351 or NCP1219 as Flyback with low power standby mode
• LX6503 Microsemi Backlight controller – Full Bridge High Voltage Inverter without High Side Driver (discrete circuit) – Jin balance solution
32” HV-LIPS LCD TV Block Diagram
HV-LIPS LCD TV Complete Solution
12 CCFL 175 mm x 330 mm x 25 mm All-in-one board with current balancer Green Point Reference design documentation: http://www.ONSemiconductor.com/pub_link/Collateral/TND3 60-D.PDF
46/47” Power Reference (PSU) • Higher power LCD-TVs from 40/42” to 52”/55” • Project focusing on power stage only – – – –
ECO standby “OFF mode” Interleaved frequency clamp CrM PFC Up to 70 W Flyback Up to 200 W for backlight
• Low profile design – 1st phase: < 13 mm – 2nd phase: < 8 mm
46” LCD TV Power Block Diagram
46” LCD TV Power Solution Unit (PSU)
Low Profile design < 13 mm / 17.5 mm total
46” LCD TV PFC Solution • Up to 300 W Interleaved Frequency Clamp CrM PFC – Better EMI and EMC – Lower Irms for output C – Better for SLIM design – Standard parts (= 32”CrM)
• New controller NCP1631 • Easy SLIM narrow range version
Interleaved FCCrM PFC for > 200 W & SLIM design
PFC Summary
46” LCD TV PFC Schematic 3
BD1 GBU806 Gnd_Lug CN401
D1 1
-
+
L2 200uH
C3
C1 0.47uF 450V
C4
Y 1nF
5 6 *
nc 9 8 7
11 *
2
50uH
2
L1
1
C2 0.47uF 450V R1 1M
Y 1nF
R2 1M
3 4 10 9 7
6 *
D3
L3Q2
MUR550APF
275V
1
8.7mH
Q3 BC808-25LT1
R15 1M
CFS28 1
3
R42
1
68u
47
R3 X2 1uF
R12
NA
1K
O_UVP
275V 0.065 2 W 5%
2
C10 NA R39
1K
INSTALL
1 C11 NA
R11
J106
MMSD4148
R28 1M
8.7mH
C12
Backlight Input Power and Signal
R24 1K5
R30 24K D8
3 L5
450V
47 R20 1M
4
CN003 4324-07S 1 2 3 4 5 6 7 8
450V
R13 1M
10K
R6
2
68u C6 +
R7
10K
3
L4
Q4 BC808-25LT1
3
2
3
R10 1M
R43
1 R9 1M 4
C7 10nF 500V
1 3
D5 MMSD4148
C8 +
D6 MMSD4148 2
Q1 STP9NK50ZFP 2
R8 1M
2
PFC_OUT
R5 1M
Q2 STP9NK50ZFP
CFS28 1
NTC 2R5
PFC_OUT
2
X2 100nF
RT1 D2 MUR550APF
L2Q1
R4 1M
L3 200uH
2 1 *
C5
1N5406
4
FB_PFC
R16 22K ZCD1_10
R17 150K
R18 150K
R19 150K
IC1
NCP1631
R14 22K
R23 150K 4 5 6
RELAY1 BO_PFC
RELAY2
7 8
C21
C13
Rt
DRV1
OSC
GND
Vcontrol
Vcc
Freq-Fall Back BO
DRV2 Latch OFF
OVP/UVP
CS
VCC4 PFC-OK
14 R27 47k
13
Q6
12 11
C15
10
100n
1 2
4 3
220n
R29 120K
C19 C17 1nF
C18 220p R31 20K
R41 270K
O_UVP R33 39K
Q5 1 BC856ALT1
POWER_BOOST
BC856ALT1
9
680n
220n
R25 15K
1
R38 1K
C20 SW1
R26 2K2 2
R22 150K
16 15
10n
C22
R34 10K
NA
R37 1K
R36 10k
+
R35 0 C16
RELAY SPST 10u 50V D11 1N4007
2
R21 150K
PFC-OK
3
3
ZCD1
FB
1
2
FB_PFC
ZCD2
2
1
3
ZCD1_1
PC001A
SFH817A
F1 FUSE 6A-250V
F2
4R7 1W
Standby_supply LINE_NEUTRAL
RV5
90-264_VAC_INPUT TVR10471KSY
L
FG
CN001 4333-W05ST
FG
FG
N
+
+ C24 3.3 uF 400V
C25 3.3 uF 400V
46” LCD TV QR Flyback Solution • Flyback converter – Up to 70 W max – Up to 3 output with 4 A Max
• Quasi Resonance Flyback Converter – Reduced EMI – Best safety behaviors
• New NCP1379 controller – Valley-lockout system – Variable frequency mode for ultra low power mode – Over current protection with auto recovery internal timer
46” LCD TV PWM Fixed F Flyback Solution • PWM Fixed Frequency Flyback converter – 50 kHz Fixed frequency – Allow natural CCM
• New NCP1252 controller – Adjustable switching frequency with skip mode – Adjustable soft start – Over current protection with internal timer
• Alternative solution to previous QR mode – Both designs • on the same PCB • with the same switching frequency • with the same key parts
QR Valley lock-out or PWM Flyback SMPS up to 70 W
46” LCD TV Flyback Schematic T200 750875731 1
PFC_OUT R251 33K 2W
C200 10n 500V
*
D201 1N4937 do41d
11
P
3 P
R252 33K 2W
+ 2
+
C207
D207
C208 N
1
N
*
470u 16V
470u 16V
3
D205
R203 33k
R207 4R7
+ C217 47u 25V
R213
470u 16V
P Q201 BC858ALT1
BO
CS
VCC
Q203 STP5NK70ZFP
6
3 470u 16V
470u 16V
V1
+ 8 7
CS
C225
+
2 Q205 BC858ALT1
Q204 BC808-25LT1
R222 1K
Regulation V2
10M 2W
3
R236 4K7
D215 R226 1K
D217
1
VS-Stby R227 1K
C230
470nF
2
R241 R231 16K2
2K2
1 MMSD4148
VS1
VS2
R238 10K
VS2
3
D219 2_5VREF
2
VS1 R233 2K49
D221
P
MMSD4148
R232 6K19
+ R242 2K2
MMSD4148 N
1
TL431BCLPRA
C232 470u 16V
VS1 Regulation R228 1K
CN202 4324-03S 1 2 3
Backlight controller supply to Backlight board
Q207 BC858ALT1
3
2
MMSD4148
R237 10K D216
IC201
VS2
MMSD4148
V1 SFH817A
R223 1K
1
R255
R209 100
PC101A
D211 MMSD4148
1
VCC4
SFH817A
C224 470u 16V
Y 1nF
3
4
R219 2K2
MBRF20L80CTG
Gnd_Lug CN403
R221 0.47R 2W R220 47k
1
10u 50V
470u 16V
3
3K3
100n C216
470u 16V
1
3
C215
220p
C218 100p 1KV
2
1n
2 to220
R218 R249 8K2
VS1 +
C220 N
DRV
C212
10uH 2
+
C219 N
GND
D210
5 MMSD4148
C211 R211 1K
L202 1
R217 27 4
Regulation
10 9 *
R212 1K
P C222 N
R215 MJD200 220 DPAK R216 220
100n
R210 1K
+
C221 C214
7
D209 C210 68p
P +
8
P
3
CS
FB
Q202
D208 MMSD4148
1
P
CT
470
N
ZCD
C213
330p 2
PC101B
R208 2K2
C209 470u 16V
N
470u 16V 5
P
1
VS2 +
ZD201 MMSZ6V8T1 IC200 NCP1379
2
C206
2
D206 MMSD4148
C205
N
ZD200 MMSZ15T1
R206
MMSD4148
10uH
+
N
R214 10k
D203
+
BAV21
470k
L201 1
N
* *
P
PFC-OK
V2
12 6
VCC3
P
R205 1K
to220 MBRF20L80CTG
CN201 4324-11S 11 10 9 8 7 6 5 4 3 2 1
Flyback power to Signal processing and Audio board
46” LCD TV QR Flyback Waveforms •
QR mode with valley lock-out – With valley lock-out for low P – With lower frequency by P Max
•
Top Trace – Vin = 400 Vdc Pout = 34 W – 1.75 A at 42.7 kHz – V max = 572 V
•
Bottom Trace – Vin = 400 Vdc Pout = 70 W – 2.62 A at 39 kHz – V max = 618 V
Valley lock-out is a Key improvement of QR mode
ECO Standby SMPS Solution (1) • Dedicated 5W ECO Power Standby SMPS – Pin < 90 mW for Pout = 40 mW @ 230 Vac – Integrated High Voltage switcher NCP1053A (400 mA / 40 kHz Max) • Hysteretic mode improves • Low frequency mode allows DCM • Limited current reduces possible noise issues Hysteretic, Low Freq & DCM for ECO Standby SMPS
ECO Standby SMPS Solution (2) • Standby relay – Disconnect all “parasitic” standby load (~100-150 mW @ 230 Vac) – Directly controlled by TV µP
• Optional ECO “ON / OFF switch” – Low cost 2A / 10V non-isolated switch – OFF mode: Pin < 20 mW by no load @ 230 Vac
High Voltage LIPS for CCFL / EEFL High DC Output Voltage HB LLC for LED Driver Classical 24 Vdc HB LLC PDP dedicated Power converter
46”LIPS Inverter • Higher power LCD-TVs – – – –
With extension to 40/42” or 52”/55” for both CCFL or EEFL Follow on of 32” LIPS Reference Design Full Bridge fixed frequency ZVS with possible synchronization High efficiency, low EMI and sinusoidal lamp current
• Dedicated LIPS module – To be interconnected with 46” Power Ref Design Step 1 < 13 mm – Microsemi Backlight controller LX6503
• ON Semiconductor IC’s – 2 High Side Drivers NCP5111 – 1 single signal driver transformer
• Low profile design – < 13 mm on top of PCB
46” LIPS Inverter Block Diagram LIPS - High Voltage Back-light Inverter Full Bridge Inverter 2 x High Side Driver NCP5111 OFF in Stand-by
CrM Interleaved PFC NCP1631 400 Vdc OFF in Stand-by
QR Flyback SMPS NCP1379 OFF in Stand-by
12 Vdc 5 Vdc 13 Vdc Audio Power Good
Relay
St-by / ON
Bias Mains Input 90-264 Vac
Stand by SMPS NCP1053A
ON/OFF
5 VdcStand-by
Power (PFC + Flyback + Standby SMPS)
LCD TV Signal processing and Audio amplifiers
46” LED Backlight Power • Higher power LCD-TVs – With extension to 40/42” or 52”/55” – HB LLC dedicated to Backlight power – High DC output voltage to power directly LED drivers
• Separate / Dedicated LED Power module – To be connected with 46” Power Ref Design step 2 < 8 mm
• ON Semiconductor IC’s – New NCP1397 – New – New LED driver controller CAT4206
• Low profile design – < 8 mm on top of PCB (< 12.5 mm total)
Multiple LED Linear Drivers with CAT4026
• •
Up to 6 channels with linear bipolar transistors Linear: “Vf monitoring and supply modulation & control”
Dedicated SMPS to support output voltage modulation
46” Linear Edge LED Driver TV Block Diagram Dedicated SMPS for Backlight with Modulated output voltage
46” Linear LED Driver Backlight Solution
• •
Special technologies PCB size: 250 mm x 165 mm
Ultra SLIM design < 8 mm / 12.5 mm total
HB LLC for Ultra Slim SMPS • Limited number of components • Zero Voltage Switching (ZVS) • Zero Current Switching (ZCS) • Higher power density
High efficiency and EMI friendly for low profile SMPS
Resonant Inductance Location? External inductance
Benefits: • flexibility • EMI • use resonant coil for OCP Drawbacks: • cooling • insulation
External resonant coil is better for ultra slim design
Secondary Rectification Push-pull configuration
Benefits: • voltage drop • Single diodes Drawbacks: • secondary winding • matching • window utilization • Higher voltage rectifiers
Bridge rectifier
Benefits: • one winding • Lower voltage diodes • Matching Drawbacks: • Higher losses
Bridge rectifier is better for HV output applications
NCP1397 - LLC Stage Controller Features: - operation from 50 kHz up to 500 kHz - 600 V driver - Startup sequence via an externally adjustable softstart - Brown-out protection combined with latch input - Disable input for ON/OFF control (skip mode) Benefits for backlight application: • No driver transformer • Simple skip mode • Simple OCP
NCP1397 is cost effective and highly safe solution
New OCP Implementation
• Adjustable delayed fault • Short circuit protection with frequency shift • New Double phase current information from auxiliary winding of resonance coil Res. Coil aux. winding provides accurate and fast OCP
Output Voltage Modulation CAT4026 sinks current from FB divider to increase output voltage
• Linear LED Drivers impact – Dedicated SMPS to support output voltage modulation – Does not allow to get added auxiliary voltages for Audio & Signal processing Single Output Voltage modulated for Linear Driver
HB LLC Schematic for Linear LED Driver
HB LLC Waveforms •
Strong load variation (0 to 100%) on HB LLC with 100 Hz dimming
•
Traces: – Top: Output current from 0 to 1 A (0.5 A/div) – Middle: Primary current 2 A/div – Bottom: Output voltage ripple 2 V/div (120 Vdc)
•
Top picture: 50% dimming – HB LLC works in Burst – Up to 3 Vpeak ripple on Vout
•
Bottom picture: 5% dimming – HB LLC works in Burst – < 0.5 Vpeak ripple on Vout
Edge-LIT LED Backlighting Trends
•
‘LED Light bars’ vary in configuration – Single LED Strings of High Power (~ 200 V+ , 100 mA+) – Multiple LED Strings (up to 4) of Lower Power (~ 100 V+ , 50 mA+)
LED Driver solutions must handle from 4 to 16 channels
Existing Large Panel Backlight Solution Loosely ~100V
For each LED channels! Advantage: Independent Channel Efficiency and LED-Fault handling Loosely regulated input supply Drawback: Cost and Complexity
Existing LED Driver Backlight Solution • •
Large-size panel power Module used for 6 Channel Edge-LIT LED TV Each channel has a Dedicated Driver IC + inductive DC/DC boost + switch 6 Ch = 6 x ( DC-DC Boost + additional switch )
6 Ch = 6 x Driver IC
Multi-channel “Linear” Edge-Lit Solution •
Cost effective solution to address a wide number of channels
•
VF Monitoring to dynamically adjusts Anode voltage
•
Efficiency target range >90%, 94% typ. (varies with LED mismatch)
•
Thermal dissipation addressed by external Power BJT’s
•
Address various LED string faults
“Linear LED Driver”: A cost effective solution for multiple channels
Multi-channel “Linear” Edge Driver Schematic Connection to the 6 Edge LED segments OVP
UVP
DPAK or TO220FP Power stage
Current sense
Optimized Dynamic LED-Anode Control 'LINEAR' POWER DISSIPATION
TYPICAL EFFICIENCY
100%
20
DISSPATION [WATTS]
200V 100V EFFICIENCY
95%
90%
85%
15
10
5
0
80% 0%
5%
10%
15%
20%
LED STRING MISMATCH [Pk-Pk]
• • •
6ch: 200V, 100mA (120W) 12ch: 100V, 50mA (60W)
0% 5% 10% 15% 20% LED STRING MISMATCH [Pk-Pk]
Efficiency depends on LED string matching 200V LED strings (with 10% mismatch) delivers ~ 94% efficiency Thermal power dissipation levels : ~ 5 to 10 watt range
V modulation & control to limit overall Power dissipation
LED Channel Current Matching 0.6%
VARIATION vs BASE CURRENT
CHANNEL MATCHING % 1.0%
0.2%
MATCHING %
VARIATION %
0.4%
0.0% -0.2% -0.4% -0.6% 0
2 4 6 BJT BASE CURRENT [mA]
VARIATION % .
0.4%
0.0% -0.2% -0.4%
Ch1 Ch2 Ch3 Ch4 Ch5 Ch5 -0.5%
CHANNEL
• • • •
0.2%
0.0%
-1.0%
VARIATION vs LED CATHODE
0.6%
0.5%
Initial channel matching tolerance ~ ± 0.5% Variation with BJT Base current : < 0.25% Variation with Cathode to 30V : < 0.15% Overall Channel matching less than ± 2%
-0.6% 3
6
9 12 15 18 21 24 27 30 CATHODE VOLTAGE [V]
Very good current matching < +-2%
Optimized Wide PWM Dimming Range BRIGHTNESS vs PWM DUTY
CURRENT % [FSB]
100%
•
No concept limitation for very short “ON” time
•
CAT4026 Linear Driver is optimized for PWM dimming
•
Strong power variation managed directly by SMPS
10%
1%
0% 0%
1% 10% PWM DUTY CYCLE
100%
Down < 1% for 400Hz PWM dimming
Edge LED Linear Backlighting Summary •
Provides reduced total solution cost
•
VF monitoring minimizes & optimizes power dissipation
•
Minimizes EMI
•
Offers competitive Channel to Channel LED matching
•
Offers competitive wide range PWM dimming with good linearity
•
Supports Fault diagnostics against Open-LED and Short-LED modes
The Linear is a easy to design and cost effective solution
Conclusion • Complete roadmap of LCD TV solutions – 32” LIPS • A cost optimized solution for CCFL from 26” up to 42” – 46” Power • Power for any type of Backlight from 40” up to 55”< 13 or 8 mm – 46” LIPS • < 13 mm with separate LIPS – 46” Edge LED • SLIM < 8 mm with separate LED Drivers with very efficient Linear Edge LED driver solution
• Approach – Synergy by re-use solutions, speeding up the design process
For More Information
•
View the extensive portfolio of power management products from ON Semiconductor at www.onsemi.com
•
View reference designs, design notes, and other material supporting the design of highly efficient power supplies at www.onsemi.com/powersupplies
