Repaired Computer For No Turning ON
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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Parasuraman S
September 14, 2024 at 6:37 pm
Vow! That is an excellent professional fix! Well done and thanks for sharing, dear Yogesh!
Yogesh Panchal
September 15, 2024 at 7:54 pm
Thank You! Sir
Albert van Bemmelen
September 14, 2024 at 7:16 pm
Glad to see that none of the cpu contacts were irreparably damaged and that the cpu socket was still fine too!
Yogesh Panchal
September 15, 2024 at 7:59 pm
Albert, this CPU Socket is very delicate,
Pins can easily gets damaged while cleaning & very difficult to put it in line or repair without microscope.But most of the time culprit is CPU Contacts if no one tempered CPU Socket Before.
Waleed Rishmawi
September 14, 2024 at 11:24 pm
For ATX power supply you can use a tester to test all the output coming out of that power supply. I use it slot and it is very convenient for such repair. Thanks for sharing and have a blessed day.
Yogesh Panchal
September 15, 2024 at 8:04 pm
Thanks! Waleed,
By shorting ATX SMPS PS_ON signal(Green Wire) with ground (Black wire) if SMPS FAN is spinning it confirms most of time in 85% cases SMPS working OK.
Maarten Dekkers
September 15, 2024 at 1:44 am
Dear Yogesh, great repair story!
What I have encountered a few times (with certain ,older?, chipsets) is that a drained RTC battery can have the same effect.
It is a quick test with a multimeter before dismantling the whole system 🙂
Yogesh Panchal
September 15, 2024 at 8:15 pm
You are right! Maarten Dekkers
if you want to check the battery,better way is to replace new battery, because sometime old battery showing you Good voltage but it can not deliver required current.There can be many other reasons involved for this type of faults.
Amir
September 15, 2024 at 2:39 am
Good one.
Yogesh Panchal
September 15, 2024 at 8:16 pm
Thanks!Amir
Mark J
September 15, 2024 at 3:12 am
Yogesh good job on the repair.
Yogesh Panchal
September 15, 2024 at 8:16 pm
Thanks!Mark J
Gus
September 20, 2024 at 8:26 am
Great, thank for sharing 🙂
Yogesh Panchal
September 20, 2024 at 10:46 pm
Your welcome! Gus