By Jestine Yong on September 14, 2024
Received computer for not turning ON, checked on my setup found same problem.
Opened the computer found very dusty in side. So first of all I used my vacuum cleaner to blow off dust from inside the computer, for testing I connected it again on power, but still same problem.
Checked SMPS for working by disconnecting Motherboard found OK. For testing ATX SMPS alone without motherboard, we have to short PS_ON (Green wire with the Ground Black wire) on main power connector.
On Power ON, ATX SMPS FAN start rotating this confirms SMPS is Working.
(This is on an average idea; this test does not confirm that all voltages on ATX SMPS are available on the Connector) but chances are 75% it confirms the SMPS is in working condition.
Here I found SMPS is working ok. Now removed RAM Modules Cleaned & tested again but same problem. For further testing removed Motherboard. On visual inspection nothing found doubtful.
Now removed CPU FAN.
Removed CPU
Found some CPU Contacts are discolored.
Cleaned Using Eraser & IPA.
Installed CPU Back to socket & Applied thermal paste.
Connected CPU FAN & re assembled everything back.
Applied power & pressed the On/OFF switch on computer & found CPU FAN starts spinning & heard beep sound of the life.
Connected Monitor for testing & now found display on the Monitor.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Note: You can check his previous repair articles on Someone Asked How to Find Dry Solder Joint
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