Clicking Noise in Computer ATX SMPS
Received ATX SMPS (Circle- Model CPH699-400) for repair with problem it turns off after one clicking noise. Opened the SMPS for inspection on visual testing I found everything is OK there was no physical damage or burning marks.
I have removed the circuit out of chassis for testing I connected to power and turned ON. I can see spark with click noise near driver transformer ……
Above photo- clicking sound and spark happened for a split of second and the power supply shutdown
I have connected series bulb but there was no sign of shorting on starting. After click spark it went to protection mode so I am unable to do any voltage testing.
So I have checked every component by removing one by one.
I did not found any burning marks or any physical damage.
I am having doubt on PWM IC and Supervisor IC but I did not found any datasheet for these two ICs.
It is very difficult to trace the circuit without exact schematic diagram hence put this case on hold.
Need your comments for this problem if anybody is having detail / equivalent replacement of these parts……..
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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