Before I dump this Panel...

[Ancient1]

Hi

I was working all day on a 42" with no backlight = Driver is bad . LED Tester. Image exists

As I was reassembling, I discovered faults on the screen ( used the LED Tester to power the strips).

Right distribution board, 2 Flexs, near them:
The one near the center has 1" line on screen. Pressing on the board-side or Panel side of the Flex bonding place results in some change, I sensed heating one time, but main fault line remains
The other, pressing on the Panel to the Chassey and the lines disappears 99.99%

I tried taping but this didn't change anything really.

I inspected the Flex , board side ( the Panel side is between 2 layers ) with x10 magnification and saw nothing.

I'm about to throw it away, perhaps I'll try to fix the ( Single ) Main board

So I decided to seek 2nd opinion What do you think ?

* I'm thinking now that perhaps the Backlight power and the Panel stripes are connected .. The driver has stby V but fails to go High enough . PWM issue ? DIM ? - some line from the CPU area isn't correct

[nomoresonys]

Re: Before I dump this Panel...

if applying a little pressure on the the tab bonds makes the picture clear up, shims will probably restore the contact and give you a good picture.

[nomoresonys]

Re: Before I dump this Panel...

video example there: https://www.youtube.com/watch?v=purk_SyiT44

[Ancient1]

Re: Before I dump this Panel...

As I write : this method , that I already know of, works on the stripe near the edge. NOT on the one in the middle - though it has some effect.
This , and because of the priximity to the Flex, is why I figure the bonding issue isn't fixable. And it seems to be the bonding because Taping ( in groups, all tracks ) had no real effect.