Check the capacitors on the motherboard Desktop Computer

Modified on Tue, 09 May 2023 at 09:50 PM

When examining a failed electronic device, the failed capacitors can easily be recognized by clearly visible symptoms such as bulging and leaking.


Bulging of the vent on top of the capacitor. (The "vent" is stamped into the top of the casing of a can-shaped capacitor, forming a seam that is meant to split to relieve pressure build-up inside, preventing an explosion.) Broken or cracked vent, often accompanied with visible crusty rust-like brown or red dried electrolyte deposits. Capacitor casing sitting crooked on the circuit board, caused by the bottom rubber plug being pushed out, sometimes with electrolyte having leaked onto the motherboard from the base of the capacitor, visible as dark-brown or black surface deposits on the motherboard.

The leaked electrolyte can be confused with thick elastic glue sometimes used to secure the capacitors against shock. A dark brown or black crust up the side of a capacitor is invariably glue, not electrolyte. The glue itself is harmless.


The only thing that can be done to fix this problem is to replace the motherboard. But it has to be the exact motherboard that you replace it with. The reason is because Microsoft Windows 7, 8, and 10 documents the motherboard serial number when you install the Operating System. So if you change the motherboard, your Operating System will not load because your replacement motherboard has a different serial number. In most cases it’s best to replace the entire computer.

Good Capacitors are ALWAYS flat. 1 bad Capacitor can cause the whole motherboard to go bad.

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