When receiving a mainboard, what to do, what to check first, what to do later to help repair quickly and do the right disease. Instructions for checking the mainboard not up for beginners.
1. Briefly ask the customer about the status of the mainboard, is it faulty or not? long time no use error? or get hit by the set… From there, it will help to fix it faster. For example, a lightning strike often kills the LAN IC and the South chip. If you don’t use it for a long time, it may be because dirt makes contact with the CPU and RAM is not good. So this is very important, accounting for more than 50% of success in fixing it.
2. Preliminary physical check outside the mainboard: Check if the mainboard is fused, burned, burned, rusted the IC pins, broken the circuit, broken the CPU socket pin. From there decide whether to fix or not to waste time. For example, if the mainboard is hit hard and breaks the circuit below, it is very difficult to fix and it takes time to fish copper wire. In addition, it is also necessary to see what the mainboard model is, and if you do it for a long time, you will experience this brand mainborad or have an open CPU socket, or the Asus mainboard will often die with the APW7120 RAM oscillator.
3. Plug in the power and test. If the source cannot be activated, it is necessary to check that the source circuit is in what form, is there a phase reversal mosfet? The power jack is on the SIO IC or the South chip. From there we will localize and repair that area. Refer to the article: Mainboard can’t be powered on.
4. The mainboard can be powered on but not powered on, it is necessary to measure the mainboard voltage in general : check the RAM source, RAM bus source ( vtt ), chipset source south and north, CPU power. If the source is missing, I will fix it in that area.
5. If the mainboard is full of voltage levels, it is necessary to check if the mainboard has clocked? Check if the motherboard has a system reset signal. If there is a reset signal, we proceed to remove the BIOS and download a new BIOS version on the homepage and reload it.
6. In case the mainboard runs erratically from time to time, it is necessary to clean it, see if the centipede pins of the IC are rusted, short-circuiting or open. Discharge the filter capacitors with quartz pins near the South chip ( 32.768 KHz ), quartz IC CLock (14.3 KHz ). Solder the pins of multi-pin ICs such as IO, Clock, ICs that fluctuate CPU, RAM, chipset… Reheat chipsets South, North, CPU socket…
Those are the steps to check when fixing the mainboard does not come up, wish you success.
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