Grundig 40VLE4421 - no picture

[betmen]

Re: Grundig 40VLE4421 - no picture

There are almost 2 mistakes at Chassis Ty.
Defective mainboard or defective lighting.
The lighting is definitely to blame for you.
Your LED strips are called ZCC606 and these always cause problems when repairing them. Always exchange completely.
Any software that posts "diah" here is from my forum iwenzo.de
Your software is old, but has nothing to do with your mistake.
https://www.dropbox.com/s/omflqxh0a2...02.00.rar?dl=0
LG Thomas

Thanks,
I was at holiday until now,
I will try to get new LED strips...

[betmen]

Re: Grundig 40VLE4421 - no picture

I finally fixed the backlight, I tested one by one led diode with the instrument in diode mode and the 39th out of 40 in total was broken, When tested with the led tester it lights up again and then shows as if it is good. Then I connected it to a rectifier with a stronger current and then it stopped working, I guess this happened all the time before.
I replaced that diode and now the backlight works every time.
As this was my fifth time disassembling this TV, the screen cracked last time, but there was a picture when the backlight was working.
Now when turning on the GRUNDIG inscription appears, then a black screen appears, then GRUNDIG again, which quickly fades and only a black screen remains. neither the menu screen nor the TV responds to the remote.
I'm confused if it's because of the cracked screen or if it's the motherboard?
The TV does not have a separate T-CON board.