Emerson LED LF551EM5 Chirping/Beeping Transformer?

[mikeyd]

I have this tv here and when i try to power it on, the standby light blinks and there is a chirping sound coming from what seems like a transformer. The blinks correspond with the chirps. I have 168V on my smoothing cap on the hot side, and when I try to power it on and the chirps begin, I have 290V. I have an ESR meter and I tested all my caps and they seem ok. I'm not super familiar with how to read ESR though. I also checked for shorts and I cannot find one.

I have only the main board connected to the PSU because I couldn't figure out how to turn on the PSU without the main board.

[mikeyd]

Re: Emerson LED LF551EM5 Chirping/Beeping Transformer?

Pin 4 has 3.3v until the set is on
Pin 5 has 3.3 only on
Pin 6 has 3 only on
Pin 7 has 3v on then drops to 0v
Pin 8 has 3.3v off and 3v on
Pin 15,16,17,18 has 7.7v off and 12 on
Pin 20,21,22,23 has 13.9v off and 21 on

[mikeyd]

Re: Emerson LED LF551EM5 Chirping/Beeping Transformer?

After some more poking around on the PSU, I found this guy shorted. I can't seem to find a replacement part though.

[goontron]

Re: Emerson LED LF551EM5 Chirping/Beeping Transformer?

Logo looks like Pericom Semiconductor. AKA: Diodes INC

Where was it on the board?