Hello, This led tv , customer said sometme tv will work for about 2hrs then the backlight will go off while tv remain on with sound, after i opened the tv to backlight stage, and power on the tv, i fund out that backlight is going off, this backlight is mounted by the side of the chassis and each side contains about 60 diodes led bulbs, sometime half 30 will just go off on each side but when i take off the power cord and put back the same lght will come on again, i has tested all the buld they light fine, only that few look browness, but they all light fine, here is the led driver board. T315HW07 V8 31T14-D06, is there any way to test this back light? from the psu came 24v to led driver
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lg37lv355t backlight off and on
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Re: lg37lv355t backlight off and on
When you test the LED how much current did you drive through the LEDs?
LED may test good at low current, but it will fail at operating current which is 200 ~ 400mA typ.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: lg37lv355t backlight off and on
Originally posted by budm View PostWhen you test the LED how much current did you drive through the LEDs?
LED may test good at low current, but it will fail at operating current which is 200 ~ 400mA typ.
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