Hello dear Badcaps gurus,
I was hoping someone could help me on my fault finding missing.
I saved an old, "broken" TV that my parents wanted to throw out from the recycler as I´m a strong believer in fixing stuff instead of throwing it out.
The patient is a Samsung LE40B750.
The symptom is "screen going dark after a while". The sound is still fine when it occurs.
Its not the signal source. First tests show its the backlight that dies. If I use a strong flashlight I can see the picture.
The time till it turns dark is not constant. It seems to be temperature related. If the TV was off for a while it might run normally for a couple of hours. If it has been on/connected to power for some time it might go dark after a couple of seconds.
Turning it off and on, without disconnecting the power cable, will solve the issue for a few seconds before it reoccurs.
Visual inspection of all boards didn´t reveal any blown capacitors, burned spots, or anything else that, at least with my limited knowledge, would look obviously broken.
I did some research in the forum first of course and apparently some similar issues with this model where fixed by cutting JP852.
I cant seem to find it on my powerboard however. My powerboard is a H40F2_9HS BN44-00284A in Rev 1.2 so I assume this fix was probably for a different revision.
I attached pictures of the boards. Maybe someone has a good idea?
Many thanks in advance for anyone willing to help.
I was hoping someone could help me on my fault finding missing.
I saved an old, "broken" TV that my parents wanted to throw out from the recycler as I´m a strong believer in fixing stuff instead of throwing it out.
The patient is a Samsung LE40B750.
The symptom is "screen going dark after a while". The sound is still fine when it occurs.
Its not the signal source. First tests show its the backlight that dies. If I use a strong flashlight I can see the picture.
The time till it turns dark is not constant. It seems to be temperature related. If the TV was off for a while it might run normally for a couple of hours. If it has been on/connected to power for some time it might go dark after a couple of seconds.
Turning it off and on, without disconnecting the power cable, will solve the issue for a few seconds before it reoccurs.
Visual inspection of all boards didn´t reveal any blown capacitors, burned spots, or anything else that, at least with my limited knowledge, would look obviously broken.
I did some research in the forum first of course and apparently some similar issues with this model where fixed by cutting JP852.
I cant seem to find it on my powerboard however. My powerboard is a H40F2_9HS BN44-00284A in Rev 1.2 so I assume this fix was probably for a different revision.
I attached pictures of the boards. Maybe someone has a good idea?
Many thanks in advance for anyone willing to help.
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