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5 Volt Line Not Stable in LCD Monitor

By on June 22, 2013

I’m having trouble pinpointing the fault of a non powering LCD monitor, the +12V line checks good (stable 13V) But the +5V line gives me a non stable reading with a DMM, I’ve tried an analog meter and the needle waves rapidly. I’ve changed the Schottky diode and filtering caps but the problem persists.¬†does it have anything to do with the transformer or I should look elsewhere, what do you advice?

Answer:

Try break the 5 volt line to see if it still fluctuates. If still fluctuates then the problem is in the power supply- it could be bad filter cap, leaky output diode and etc. If after breaking the 5 volt line and the 5 volt is stable then probably ahead of the 5 volt line (usually mainboard) have some leaky component.

 

 

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