Toshiba 32AV555D - Screen with Lines

[speedypro]

Hi all

We have a toshiba regza 32av555d with many lines; some thick when the tv is switched on at first. If left on for 15mins+ the screen will display 100% ok as in no lines at all. TV is ok if hot

We really don't know where to start. Can someone point us in the right path?

Regards

[tom66]

Re: Toshiba 32AV555D - Screen with Lines

A good place to start is to take the back off, then start heating parts one by one with a hairdryer or other heating instrument. Try focusing your heat on particular areas. If you find the problem goes away when some part is heated, repeat until you are confident the problem is in that general area.

[speedypro]

Re: Toshiba 32AV555D - Screen with Lines

A good place to start is to take the back off, then start heating parts one by one with a hairdryer or other heating instrument. Try focusing your heat on particular areas. If you find the problem goes away when some part is heated, repeat until you are confident the problem is in that general area.

Thanks. Gonna do it now.

[speedypro]

Re: Toshiba 32AV555D - Screen with Lines

Heated everything but nothing.

If the Sky box is not connected, the tv will turn off. When sky box is connected, we left it on for 15+mins and no lines displayed. I dont think its a heating issue...I think. Any pointers to test?

[tom66]

Re: Toshiba 32AV555D - Screen with Lines

TV turning off with no signal is normal.

You will probably need to do the reverse - use freeze spray - as it is a lot easier to concentrate it - I would focus on the main board (which has HDMI and other inputs on it.)

[speedypro]

Re: Toshiba 32AV555D - Screen with Lines

Ok. This picture show when first connected:



And after few minutes, around 10mins+, this:



Then it shows clear and 100% ok.

Im lost.

[cheapie]

Re: Toshiba 32AV555D - Screen with Lines

Did you try freeze spray? (Buy one of those compressed air-in-a-can things, turn it upside-down, and aim it random parts until the lines come back)

[speedypro]

Re: Toshiba 32AV555D - Screen with Lines

Did you try freeze spray? (Buy one of those compressed air-in-a-can things, turn it upside-down, and aim it random parts until the lines come back)

Need to visit ebay. I'll do that and report.

BTW, will it damage the components? Short anything?

[speedypro]

Re: Toshiba 32AV555D - Screen with Lines

Ok I have found the issue! There is a pcb that attaches to the display. See pictures:



and



C1 is damaged. Whenever I put heat over it, the lines on the display are gone. Any schematics for that part?

[tom66]

Re: Toshiba 32AV555D - Screen with Lines

Measure the voltage across it when working properly. From that info you can estimate the capacitance based on size. e.g. 15V across, typically cap will be 25V rated so likely 10uF if 0.12x0.06" dimension (1206.)

[speedypro]

Re: Toshiba 32AV555D - Screen with Lines

Measure the voltage across it when working properly. From that info you can estimate the capacitance based on size. e.g. 15V across, typically cap will be 25V rated so likely 10uF if 0.12x0.06" dimension (1206.)

Spot on. voltge is 14.99v (15v) so I take it the capacitance would be 10uf.

Edit:

We've found another cap with voltage across is 15v. We used it but same display issue. When this area is heated, as in pic below, the display is perfect:



Could it be the resistor the culprit? Nothing is behind the pcb.

[mlmontero]

Re: Toshiba 32AV555D - Screen with Lines

I have the same issue,
How finally resolve this?