Fixed!
The diode (SF28) near the the backlight connector was bad. When I measured in diode mode, it was correct 0.49v one way but not OL when reversing the probes.
Upon closer inspection, the pcb around it was darker due to heat I presume.
Hopefully this helps someone fix theirs....
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EazyBone[USER="477674"]EazyBone[/USER] Thanks for the reply. Yes I tried disconnecting the main board from the PSU and the LEDs do not come on.
Here are some pics. Let me know if you need more zoomed in ones.
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Samsung UN46H5203 backlight issue - stumped
I am trying to fix this tv that has image and sound but no backlight. Replaced all led strips and each strip turns on using a led tester but do not get any backlight when the tv turns on.
I disconnected the main board from the PS but still no backlight.
Looking at previous threads, nothing is jumping out at me and I'm stumped.
Here are the voltage measurements:
ON STATE
CNM803 on PSU from Main
Pin 1 A13v - 13.09v
Pin 2 OD_UD - 3.3v
Pin 3 A13v - 13.09v
Pin 4 BLU_PWM - 1.6v
Pin 5 A13v...
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