I changed few leds on led background and tv works for about one year.
It is not much in use.Then stops working again, I checked leds on background, all are ok.
When I light up the screen with lamp there is a picture but background is not working and you can`t se the picture on the screen.
When I touch connector for led background with probes of backlight tester they light up and tester shows 108V. After that TV turn on normaly and picture is ok, backlight is working. After TV is turn of again backligt is not working, just on first turning on GRUNGDIG picture on boot is shown for part of the second and after that is dark screen.
If I again touch connector for led background with probes of backlight tester, TV turn on with picture again. After turn of and on again there is no picture.
Voltages on connector S2401 are:
Pins 1 and 2 - 5,2V,
pins 3-7 - 0V - GROUND,
pins 8-11 - 19,08V,
STBY - 2,75V,
BL+ - 46,3V,
BL- - 0,47V (last two when backlight is working)
When backlight is not working:
BL+ - 18,85V,
BL- - 0V.
other pins are the same.
I changed all electrolites, checked diodes D2402,24112413,2406,2405,2415,2404,2416 on board and they shown ok measurements.
What can be the problem?
It is not much in use.Then stops working again, I checked leds on background, all are ok.
When I light up the screen with lamp there is a picture but background is not working and you can`t se the picture on the screen.
When I touch connector for led background with probes of backlight tester they light up and tester shows 108V. After that TV turn on normaly and picture is ok, backlight is working. After TV is turn of again backligt is not working, just on first turning on GRUNGDIG picture on boot is shown for part of the second and after that is dark screen.
If I again touch connector for led background with probes of backlight tester, TV turn on with picture again. After turn of and on again there is no picture.
Voltages on connector S2401 are:
Pins 1 and 2 - 5,2V,
pins 3-7 - 0V - GROUND,
pins 8-11 - 19,08V,
STBY - 2,75V,
BL+ - 46,3V,
BL- - 0,47V (last two when backlight is working)
When backlight is not working:
BL+ - 18,85V,
BL- - 0V.
other pins are the same.
I changed all electrolites, checked diodes D2402,24112413,2406,2405,2415,2404,2416 on board and they shown ok measurements.
What can be the problem?
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