Re: LF501EM5F No Power, Chirping/Beeping Transformer

UPDATE:
Fix confirmed.
Changing cap C3214 fixed the issue.

Original symptom:
The tv started "chirping" in cycles every couple of seconds on would not power on.

I have confirmed it is a blown cap on the main board location C3214.
Another tech here confirmed it as a 270pf cap, however voltage is not yet identified.
We ended up scrapping out a similar but smaller Emerson tv with a broken panel but similar main board. it had the same layout. I transferred C3214...

Re: LF501EM5F No Power, Chirping/Beeping Transformer



This is good info... however I need to know the original value of said cap. I do not have, nor could I find the schematics for this board.
and yes, I did plan on upgrading the voltage tolerance....

Re: New Members - please post your introductions here

hey guys and gals,

Im Sam. A electronics tech from K.C. always here to help if i can, and get help when i need it.

Re: LF501EM5F No Power, Chirping/Beeping Transformer




I have this exact TV with the same chirping sound when plugged in.
I replaced a blown power supply about 8 months ago.
I've scoped out this power supply and cant find any bad components. I unplugged the ribbon cable from the main board to the power supply board and the chirping stopped. I'm certain the main board is the issue.

It seems to have been confirmed by you all that the problem lies with the C3214 cap on this main board.

The value is a 270pf......