Samsung un55nu6950 power light blinking

[sputnikoff]

I have a Samsung UN55NU6950 Power/Main Board BN96-46947A .I have ruled out the lamps as the culprit.I connected a new set and same results,just a flashing power light.When i put meter on q9101c in diode test mode the lamps do a quick flash with power from main cap as the unit is unplugged.Is there a kit for this issue or? I had similar issue with tv that had f28g diodes gone(leaky).This mosfet test good.Q9201c and q9101c.All diodes test ok.

[Davi.p]

Re: Samsung un55nu6950 power light blinking

Well, watching that board Samsung is become Chinese, horrible..
Have you tested the original lamps with a backlight tester? Maybe test stripes are different and doesn't work. Probably the lamps controller ic is faulty, i already saw that horrible glue, i think that can make disasters, probably it's another progr. obsolescence technique by Samsung. I have already seen those types of chips failing in earlier Samsung, same glue..

[sputnikoff]

Re: Samsung un55nu6950 power light blinking

I will post some more pics,but I tried a new set and original with lamp tester all same results.All lamps come on on both sets with same configuration of probes

[Davi.p]

Re: Samsung un55nu6950 power light blinking

Describe the blinking led.. and try to read the led driver ic mark

[sputnikoff]

Re: Samsung un55nu6950 power light blinking

Led flashes probably once every 2 seconds repeatedly.Here are more pics of board.

[Davi.p]

Re: Samsung un55nu6950 power light blinking

first must measure power supply outputs on the diodes out of secondary of transformer, must be commen measures, 3,3v - 5v - 12v...

[sputnikoff]

Re: Samsung un55nu6950 power light blinking

seems like whenever i use diode test on either q9201c and q9101c with power plug removed so there's charge in b+ cap it pulses the lamps.So its leaning towards that chip under clear adhesive.