Mainboard Repair Instructions

Mainboard repair instructions Prepare supplies: Card test main (indispensable) if conditions are equipped with a "main test card" type of port 80h and 84H support, LPT port is always possible (or even the type used for desktop and laptop). View more “Complete Testmainboard Card .”

P2 Series PCI slot supports only Port 80H and 84H - CPU type: The most common is Socket 478, and 775 sockets. - RAM kinds: the most commonly used is the SD-RAM, DDR, and DDR2. - The good kind of power. - Straight-heat burner, VOM meters, computer power supply. - Other equipment should be equipped with expensive than the big stores you: machine loading ROM BIOS chip (about $ 500-1000), oscilloscope, computer chip (around $ 2,000), stand foot chip (approximately $ 150), pin grid to chip the type (about 15 U.S. dollars / piece). - Parts replacement fillings: Mosfet, IC source, chipset, SIO chip, LAN chip, Sound chip, the BIOS ROM chip, the power filter capacitor type... 1. Error physical injury: - A technical IT experience while holding a suspected broken mainboard will closely see if they are "physical injury" or not? The scratches, which can cause short circuit or broken circuit. The ram slot, PCI slots, AGP, PCIX ... a short-circuit or not. Many machines are running, remove the

RAM test is a computer "go away" back down to kill the main RAM. But the fact negligent actions were not properly exposed to the short slot dies each main result.

- Error fire, explosion or line focus is very easy to detect with the naked eye and I have mentioned in the article “motherboard and the pan base " - The stain due to the intrusion of insects such as stickers, mouse ... will cause flicker unstable even lead to death slowly and mainboard. - The mainboard toilet clean and thoroughly original observations are very useful for repair work mainboard. 2. Error sources not click: - The main reasons:    

Mosfet die PS-On the island, linking the SIO chip. Broken quartz 32k to chipset South. Bare feet or error chipset Nam. Bare feet or error SIO chip.

- Common source circuit size has 3 main forms:

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- First, check the source of 5V (or 2.5V) at the foot switch (PWR as shown). If it detects loss of power by the SIO chip or chip-level NAM. Dry or replace the chip, the end of this step must be the source of 5V at the foot switch. - Check that the circuit size of the source of any type: Scan from the foot of green to the SIO chip (as illustrated). If there is a way to measure = 0 will lie in the type 2 or type 3.

- If all lines are> 0 it will be in a form. Then trying to find a child failed Mosfet (usually short will cause the power adapter to run right, or off) the area between the green wire and SIO chip.

- If you are 3 forms must be rather difficult to chip or chip SIO. Remember to replace the true value of the IC. Usually Wxxxx or ITxxxx.

- If you are getting a bit tired in the second form, because the second chip and chip SIO Nam to click OK all the new sources. - Addition quartz many cases of faulty chipset Nam is also the chip does not work. So instead of challenging him before processing chipset Nam. 3. Check out the line-level sources for RAM: (No need to plug CPU) - Insert carefully into the slot PCI Card main test. Size PS ON, observe the LEDs on the Main Card TEST. - The report led the standard +5 V power,-5V, +12 V,-12V, 3.3V. - Note the way for 3.3V SDRAM main use will directly use this resource if lost, check the VDD pin (6, 18, 26, 40, 41, 49, 59, 73, 84) of the RAM slot (See the article " The pinout of the PC Interface ") for the position of the pin. Or check the battery's 3.3V PCI slots. - Private DDRAM use only 2.5V source to the circuit will have circuit voltage 2.5V from 3.3V or 5V power (Check the FET around the RAM slots and the same each VDD pin (7, 15, 22, 30, 38, 46, 54, 62, 70, 77, 85, 96, 104, 108, 112, 120, 128, 136, 143, 148, 156, 164, 168, 172, 180).

- The true source for DDR2:

- The true source for DDR3:

- If you lose, then continue to check the RAM FET around legs, or IC oscillator FET power for these children. Change or replace FET IC. - Capacitors for power filtering RAM or ammunition to the main line flickering at run time and not often unprovoked RAM error. 4. The circuit supplies power to RAM, Southbridge, North bridge, AGP slot, PCIX: - In the RAM:

- In the chipset:

- Type 1:

Type 2:

Type 3:

Type 4:

- Form 5:

- Form 6:

- Form 7:

- Form 8:

5. Check the power supply to the chip and the AGP or PCIX Nam: - Similar to RAM, around the South with a chip or few chip FET power the South. - Similar to AGP, and PCIX. In some cases the same for the chip AGP Nam. - For most motherboards, you just plug the power adapter without CPU that can enable the source to check. Then we will measure the power for RAM. If the source is not OK for RAM, they must fix this before until last OK as the next step. 6. Check power supply for CPU: - Power RAM OK, I will plug the CPU in and click the source. - Note, when not mounted on the CPU power supply to the CPU by 0v. - Check power line for the CPU. (FET to children around the CPU socket mounted, measured at the feet of copper wire to wrap around a core ring will have the corresponding power source for the CPU).

- Short circuit phenomenon leading to loss of power supply for CPU is very common. 70-80% deaths are caused by main disease. If any shorted FET when turned on will be very warm hands touched. - Next is the IC oscillator source - so often happens, the driver IC to the pin G of the FET. - In some cases the source is not stable but will lead to "cocoon" the source CPU is not the right power supply for the CPU to CPU not running. This error is dominated by CPU power filter capacitors swelling or dry, replace all the best. - View more “power circuit for CPU on the mainboard "I'm more analysis on this circuit. - View more “instead Mosfet equivalent experience "for the mainboard. 7. Check the pulse signal RESET: - After all the roads are good sources: Source RAM, CPU power, power chipset, AGP sources ... we note the reset pulse signal (note that the RESET LED on the motherboard test card). - After checking the power OK LED, RESET LED will flash on and off the clock Reset 0.5 was good. Loss of the reset pulse is reset lamp does not light or shining. - When the reset pulse should take note of reasons:        

CLEAR CMOS jumper is not plugged into the Main Losing power for 1.8 V Chipset Broken Clock Gen circuit (no clock) Losing power for 1.5 V Chipset Loss of signal from the ATX PG levels down Main through a gray wire VRM circuit has a problem (no signal VRM_GD) CPU mounted on Mainboard - VRM circuit does not work Broken circuit voltage for RAM or AGP Card

- Note also: if the above test results are good chip area may have been exposed or faulty leg. Dry or replace the chip Nam.

8. Check the clock for the mainboard and CPU: - CLK LED light on the test card that the main oscillator has good mainboard. - After power to the CPU ok, check IC range (near the quartz). This step should have "oscilloscope" otherwise rather try quartz, dry or replace IC oscillator.

- The position of the clock chip to the motherboard and CPU:

9. BIOS ROM Chip error:  



After all these tests was: pulse Clock, CPU power, RAM resources, power chipset, Reset pulse was OK that mainboard is not running, tough questions. The following errors experienced by the majority is being put to: 1. CPU is not compatible (no support to the mainboard) 2. CPU is not good contact (remove glued, hand hygiene and contact with socket 775) 3. CPU socket mount openings (due to long-term activities and high temperature) 4. Error BIOS ROM chip (ROM BIOS chip off the toilet, if not, try reloading) 5. North Bridge chip family (or close to interesting chip, the chip must have played the new machine to be) If the mainboard has run but the screen suspended above the CMOS is largely due to open Southbridge.

10. Investigation Report on the card parameters main test: - If the above are OK certain card main test will show the POST and POST code display. Table fullest investigation here: http://www.postcodemaster.com/ 11. The main difficulty in editing:

- Parts replaced as the IC oscillator, IO chip, chipset is very difficult to buy or not buy in bulk and buy from China. If bought in VN is very expensive. It is best to collect the main damage themselves to get the map "dot". - Appliances are very expensive (as stated in the beginning) - The above is just some practical experience in the process of lqv77 my work. Articles with reference material and use some images of hocnghe.com.vn Here Attach Some Most Problems in Desktop Motherboard.

May be some debug card can't display same LED status All error Reference from Standard Debug Card This debug card LED can glow using bit voltage (Because of Mobile LED) Debug Card : 4Digit P.O.S.T Debug card Ver. PI0050A

LED RST OSC FRAME CLK BIOS ALL VOLTAGE

STATUS OFF OFF ON ON ON

Solutions: Any of One or More Following Parts Not Working. Check All Parts Step by Step.

Bios Can't Execute POST. Most common problem on dead motherboard Reprogrammed Bios ,Check all Mosfet , voltage regulator ice’s , track cut or dry solder, I/O Controller Ic, Northbridge , Southbridge


STATUS ON OFF OFF ON ON


CPU Can't Heat. Mismatch CPU or CPU not Support, VRM Buck Controller IC, VRM Mosfet Open, track cut or dry solder, VRM capacitor and coil filter, I/O controller can't execute VID Signal for Buck Controller (only for jumperless board) , North Bridge Short or Open.


STATUS ON ON ON OFF ON

Solutions: Any of One or More Following Parts Not Working . Check All Parts Step by Step.

North Bridge Power on Problem

Between the PCI slot and Northbridge Mosfet open, Northbridge dry solder, Northbridge not working, track cut.


STATUS OFF ON ON ON ON


Hold POST Code

Track cut, dry solder, Bios corrupt, mismatch CPU and RAM frequency, I/O controller, mosfet, Clock IC, Northbridge, Southbridge

LED

STATUS

RST OSC FRAME CLK BIOS ALL VOLTAGE

ON OFF ON OFF ON


RESET PROBLEM

Reset Problem means not any one or more controller IC can reset itself before execute post code.

CPU, I/O Controller, Clock IC, Mosfet, Buck Controller IC, Voltage Regulator IC'S, Northbridge, South Bridge

Mainboard Repair Instructions

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