Power Supply Or Mainboard Fault

Dear Jestine,

I’m experience a problem i never see before. I have an aoc tv lcd 26inc which is dead but after a minute with supply On then the standby light comes on and after you press power the light go off and nothing happen. By looking at psu voltages without the connecter in mainboard just by shorting the ps On voltages remain ok 24v 12v and 5v seems psu is ok, the strange is that when I put the connecter in the mainboad the 5v become 4v so no standby light On. The 12v and 24V were good. After a minute what happens is that the stand by light comes On¬†and 5 volts are back but then no 12volts and no 24v im very stuck thanks.

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Rattling Sound In SMPS Repaired

Hi Jestine,

I saw this tv advertised cheap in local website not working as the person said they

were watching it one night when it gave “pop” sound and it stopped working. No

red standby light at all.

It is approximately 7 years old so I thought I will buy it as possibly it is fault with SMPS

an it can be saved. When I opened and inspected visually for faults, I saw IC 7905 exposed

with no covering. I began to test the surrounding components for faults also and R7914 was

also open circuit.

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