Re: INSIGNIA NS-50D40SNA14 half screen has image, half is white.Suspecting panel

so it turned out to be the shorted panel. After ripping off one bond tab at the time, tv turned on when last one was removed. I tested voltages on PCB, and they all seemed OK, so tcon was OK.
Case closed.
thanks everyone.

Re: Samsung le40r88bd Clicking, All caps tested ok

It could any board with shorted components (like ceramic SMD caps, or MOSFET for LED supply). I had few Samsung TV's with shorted SMD caps on panels that did exactly that. Disconnect flat cable between panel and tcon board, and see if clicking stops. if not-jumper power supply with logic board disconnected.

Re: INSIGNIA NS-50D40SNA14 half screen has image, half is white.Suspecting panel

will look if it is possible to cut off few voltages feeding driver for that particular area

Re: INSIGNIA NS-50D40SNA14 half screen has image, half is white.Suspecting panel

I had 2 Samsungs before with crappy no name panels that had shorted SMD capacitors, but that was easy-no fuse on Tcon, so power supply was in protection-very easy find, just disconnect 1 module/cable at a time until power comes on.
But this one is not that short. maybe they fail under 14-15V or higher, because meter only applies less than 3volts.
Saga continues, will keep you guys posted.
Thanks

Re: INSIGNIA NS-50D40SNA14 half screen has image, half is white.Suspecting panel

sorry for not posting pictures. It was too late in the night.
This particular panel does not have row drivers, they must be incorporated with column drivers , and 2 sides of panel have different connector pinouts, so swapping cables from tcon is not an option.
Upon closer inspection I discovered one spot in the corner of non-working side of panel that has burn mark on outside plastic film, and it glows white when bad panel is connected to tcon (see picture).
another test I did...

INSIGNIA NS-50D40SNA14
Tcon 5550T12C10
panel AU model 96.50S12.002


At first TV would turn on with just grey screen no image at all. Sound,back light, ports and remote all work fine.
Disconnecting right flat panel cable from Tcon , and cycling the power would produce perfectly fine image on left connected side, and whole white left disconnected side. Took the bezel and metal covers off the panel to expose the board with bonding tabs and drivers, measured all ceramic capacitors-none is shorted.Measured transistors, diodes -no luck.
Could anyone...

Re: New Members - please post your introductions here

Good day everyone. this is very cool forum with lots of info and support. I graduated as electronic engineer in 1997, but was studying electronics and building things since I was 10. (41 y.o now). worked in manufacturing, ran my own repair business in early 2000's, worked in service center, emigrated to North America, where became licensed automotive mechanic, and now came back to work on maintenance and repairs to automatic train control systems for City transit. Also repair any electronics just for fun and challenge.