17IPS55 Vestel PSU repair.

[zen]

P/N 23396951

Schematic might be handy.

First casualties

Q4 (Magnachip MDF13N50) S/C

As a precaution also replace Q3 which is same type.

Both replace using B version of FET.

[zen]

Re: 17IPS55 Vestel PSU repair.

Replace

U12 (FAN7631), which is the gate drive chip for FETS.

U5 (817) OPTO, which had a strange reading first time I checked it.

Now working on test.

[notallbad]

Re: 17IPS55 Vestel PSU repair.

what fault did the board have?

[zen]

Re: 17IPS55 Vestel PSU repair.

Hi

Customer complained of not powering.

I didn't actually plug the set in myself as i discovered FETS were short on a cold test, which is my normal M.O to prevent further damage.