Hitachi 50HYT62U no picture

[Bloopeta]

Hitachi 50HYT62U, has backlights but no picture, just completely blank screen, any ideas anyone??

[nomoresonys]

Re: Hitachi 50HYT62U no picture

See if you have about 12 volts on each side of the fuse on tcon board.

[Bloopeta]

Re: Hitachi 50HYT62U no picture

See if you have about 12 volts on each side of the fuse on tcon board.

12.08v on each side

[nomoresonys]

Re: Hitachi 50HYT62U no picture

Try unplugging the wifi module, check for any change.

[Bloopeta]

Re: Hitachi 50HYT62U no picture

Try unplugging the wifi module, check for any change.

Tried that, no change.

Also tried holding power button for 60 seconds, plugging in tv, and continuing to hold a further 60 seconds

[nomoresonys]

Re: Hitachi 50HYT62U no picture

Any chips on the tcon or mainboard getting really hot?

[budm]

Re: Hitachi 50HYT62U no picture

What do you get on the screen if you only have one ribbon cable between LCD panel and the T-CON connected one at a time?

[Bloopeta]

Re: Hitachi 50HYT62U no picture

What do you get on the screen if you only have one ribbon cable between LCD panel and the T-CON connected one at a time?

If I unplug the left ribbon, I get no change.

If I unplug the right ribbon, I get the attached pic

[Bloopeta]

Re: Hitachi 50HYT62U no picture

If I unplug the left ribbon, I get no change.

If I unplug the right ribbon, I get the attached pic

Just hoping its not the LCD panel thats at fault :/

[nomoresonys]

Re: Hitachi 50HYT62U no picture

Guess you could test your caps on the driver board for shorts or very low ohms.

[budm]

Re: Hitachi 50HYT62U no picture

The LCD panel has integrated T-CON board and also located at the bottom edge of the LCD panel which is easily damaged by the cleaning liquid, so inspect the T-CON/Tab bonding board for damages and also check the caps resistance as suggested.

[Bloopeta]

Re: Hitachi 50HYT62U no picture

Guess you could test your caps on the driver board for shorts or very low ohms.

The LCD panel has integrated T-CON board and also located at the bottom edge of the LCD panel which is easily damaged by the cleaning liquid, so inspect the T-CON/Tab bonding board for damages and also check the caps resistance as suggested.

Doesnt appear to be any damage to anything. Which baord is the driver board??

[budm]

Re: Hitachi 50HYT62U no picture

"Doesnt appear to be any damage to anything. Which board is the driver board??"
So you remove the LCD frame to get to the T-CON/Tab bonding boards?

[Bloopeta]

Re: Hitachi 50HYT62U no picture

"Doesnt appear to be any damage to anything. Which board is the driver board??"
So you remove the LCD frame to get to the T-CON/Tab bonding boards?

Yes, Ive had the screen out n checked the backlights whilst I was on

[budm]

Re: Hitachi 50HYT62U no picture

Show us the pictures of the boards that are connected to the LCD panel..

[Bloopeta]

Re: Hitachi 50HYT62U no picture

Show us the pictures of the boards that are connected to the LCD panel..

Hope these help as hard to fit all in pic with being long

[nomoresonys]

Re: Hitachi 50HYT62U no picture

Yep those are the driver boards.

[Bloopeta]

Re: Hitachi 50HYT62U no picture

Yep those are the driver boards.

Great, so which bits do you need ohm readings from?

[budm]

Re: Hitachi 50HYT62U no picture

There are many caps on those boards, you have done them before in other threads, did you not?

[Bloopeta]

Re: Hitachi 50HYT62U no picture

There are many caps on those boards, you have done them before in other threads, did you not?

No, I have never done anything with these boards before