Hitachi L26DG07U

[Easky15]

Hello all, I have here a tv a friend gave me, It stopped working for him, No power at all, I had a quick look and AC side seems fine but the DC side is unlabled so I'm not sure which wires to test,
Does anyone know how i would go about fixing this problem,

I've included a few pics so hope that helps,

[Andrew F. Ali]

Re: Hitachi L26DG07U

1. Check fuse first....they are not good?..... NO....replace with same type and rating...does it work now?
2. Check fuse first....they are good?.....YES.....measure for St-By voltage approx. 5Vdc on cable from PSU to Main Bd.....NO St-By voltage?.....Replace PSU....does it work now?
3. Check fuse first....they are good?.....YES.....measure for St-By voltage on cable from PSU to Main Bd...YES St-By voltage approx. 5Vdc present...Press power button to turn on set....Ps-ON signal from Main Bd??

[dskall]

Re: Hitachi L26DG07U

Any pin markings on mainboard or on backside of boards?

[dick_barton]

Re: Hitachi L26DG07U

Power supply circuit board looks very similar but not identical to, however should be a guide.

[Easky15]

Re: Hitachi L26DG07U

Ok, got new Power board and now the set powers up but there is a slight high pitched squeal fro the board and it goes back to standby about 5 seconds after powering on,

Would i be right in thinking that is possibly bad caps?

[dskall]

Re: Hitachi L26DG07U

Sounds like a short on the secondary side