Toshiba 55LF621U19 vgh avvd problem

[liquid556]

Looking for advice concerning no picture. has back lights and sound. i have vgl -7.89. vgh low at 11.85 and no avvd voltage found, i have few other voltages marked in the pictures. Can anyone tell me which test point is avvd.

All voltages i found are marked in the pictures. No caps were shorted, so maybe someone can point me in the right direction to help narrow the issue down

[dskall]

Re: Toshiba 55LF621U19 vgh avvd problem

Did you try disconnecting right side?

[liquid556]

Re: Toshiba 55LF621U19 vgh avvd problem

yes. i also tried the tape method on each one

[dskall]

Re: Toshiba 55LF621U19 vgh avvd problem

If no shorts you may have a bad dc to dc IC.

[liquid556]

Re: Toshiba 55LF621U19 vgh avvd problem

alright thanks. do you know any good web site i can order tv board smds. one more question. can you verifiy which test point in the photos is suppose to be the AVVD test point.

[dskall]

Re: Toshiba 55LF621U19 vgh avvd problem

Your vgh looks like vin, not vgh. There are no standard terminology for this.

[liquid556]

Re: Toshiba 55LF621U19 vgh avvd problem

alright. il try changing the dc to dc and see what happens.

[dskall]

Re: Toshiba 55LF621U19 vgh avvd problem

May not be bad voltages. I would check data lines first and see if you have any voltage on them.

[liquid556]

Re: Toshiba 55LF621U19 vgh avvd problem

ok. i will check those out today