Samsung UN55KS800DF

[Jtroutt19]

Hey guys this unit power cycles with no image but backlight does come on and then shut off. Unplugging the cable in the picture makes the backlight stay on but no response other than that from it. I am assuming main board is faulty wanted to double check before I spent money. Thanks!!

[CapLeaker]

Re: Samsung UN55KS800DF

Main board trouble indeed! One more test. Put all the boards back into the TV and disconnect the WiFi module and power the TV on. Another thing you can try is to freeze the EEProm on the main board with a can of air upsidedown and see what happens.

[William1967]

Re: Samsung UN55KS800DF

Know error with these sets.
Possible culprits are mainboard (- in combination with the one connect box ) or display.
This set does the same when the FCC cables are disconnected so there is no need to try that. We saw several of these where the mainboard and one connect box were defect, some even have a defect mainboard in combination with the display.

[Jtroutt19]

Re: Samsung UN55KS800DF

Ok purchased new main board. Now I'm getting a display but it's showing up like this?

[CapLeaker]

Re: Samsung UN55KS800DF

does the OSD work?

[Jtroutt19]

Re: Samsung UN55KS800DF

no the OSD does not work.

[CapLeaker]

Re: Samsung UN55KS800DF

Can you borrow and oscilloscope? Probe the LVDS cable between the main and Tcon, while flicking the menu on and off. If you see a difference on the oscilloscope while flicking the menu on and off, your next stop is the Tcon. Measure around the Tcon for voltages.

[Jtroutt19]

Re: Samsung UN55KS800DF

Borrowing an O-scope is prolly gonna be a problem. Not sure I know of anyone with one. I will ask around.

[CapLeaker]

Re: Samsung UN55KS800DF

maybe proceed to check on voltages on the Tcon

[Jtroutt19]

Re: Samsung UN55KS800DF

So this doesn't have the normal tcon board.

[budm]

Re: Samsung UN55KS800DF

It has integrated T-CON into the LCD panel tab bonding board.

[realdealthill]

Re: Samsung UN55KS800DF

Im having the same exact problem, with the same exact model...

[CapLeaker]

Re: Samsung UN55KS800DF

ouch! that sux... I hate TV's like that...

[William1967]

Re: Samsung UN55KS800DF

Are the BN94-xxxxxX numbers the same on both mainboards?

[RAMartens]

Re: Samsung UN55KS800DF

I have same model. Tried 2 sets of P.S. & Main. Board #s match. Ver. # match. Same symptoms. Why do back light stay on ( no dark areas ) with #20 plug disconnected from main if display can be the problem? Shouldn't set light up w/o one connect attached? Is it excessive draw by back light causing cycling? Thanks.

[realdealthill]

Re: Samsung UN55KS800DF

I Ordered complete set of boards from SJ for about 90.00,got them in yesterday.Swapped them all out.. Tv works perfect now. Cant beat it for only 90.00!