Let’s look at some of the basic questions we have regarding the motherboard:
1) How can the component defect on the defective motherboard be diagnosed?
A burn sign is a sign of confirmation for damage, obviously, but what should we do if visual signs don't exist? Use a multimeter to poke around?
How do you know what to look for with what voltage setting? In order to find the missing voltage on the motherboard, you need to know the power sequence of the motherboard.
2) Is it because of a bad capacitor or a circuit shorting?
Normally every capacitor is for filtering or coupling purposes on the TV motherboard, but if it seems that with the ground, they give a beep sound we need to check the root cause sequence of this section, as most of the time, it's due to poor connection/circuit shorting.
3) How to perform the repair at the component level?
So, on the motherboard, you found the bad capacitor or component, so you now have to solder one new one without disturbing the components. Use good soldering tools always to avoid problems.
Clever advice on motherboard diagnostics:
Usually, to diagnose a defect on the motherboard requires little experience but you can definitely find the solution if you have patience and basic electronics knowledge. Basically, we measure motherboard voltages and the voltage on the motherboard ranges from 1V to 12V. The north bridge for example requires 1.05V, 1.2V, 1.5V, 1.8V, 2.5V, depends on north bridge generation.
All kind of signals, like PCIRST, CPURST, CLK, is also to be measured. In order to control the sequence and the poor contacts, we measure the resistances of each AD line from north to CPU/RAM.
Some easy steps necessary for a mainboard check:
- Ensure that the main power (step down voltage), which is 3V and 5V, is ready. In some cases, one of the above-mentioned voltages can be found on the circuit, so don't panic, as the circuit may be different. (Schematic is going to give you the exact idea.)
- The regulators of all sections operate/not short of ground.
- Switching circuit is OK, involving IO/Keyboard controller and south bridge.
- The power sequence is OK, which can be seen several times when the current spring up and down. (Refer Schematics for Power Rail)
- All the important signals are not missing.
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