Samsung UN55C6300SFXZA won,t power up

[budm]

Re: Samsung UN55C6300SFXZA won,t power up

What is the PS 50C96HD?

[tom66]

Re: Samsung UN55C6300SFXZA won,t power up

From what you've said more likely power board than main board.

PS-50C96HD is a plasma... completely irrelevant to this post!

[tibimakai]

Re: Samsung UN55C6300SFXZA won,t power up

Here is my post about a very similar TV:
https://www.badcaps.net/forum/showth...hlight=samsung

[dfergy54]

Re: Samsung UN55C6300SFXZA won,t power up

I think I may have found the problem. Since 12 volt and 18 volt (Vdrv) would not come up when I fed the board pwr up from stby, I took a look at the impedance from the rectifiers for each supply to chassis ground, I found Vdrv at 54 Ohms. Seemed kind of low so I started backtracking through all the Ckts that Vdrv feeds and found where it seemed to originate.

Removed Q9101 and mesured 21 ohms source to drain both polaritys. Found a source for the parts and will order a bakers dozen monday. Will probably replace Q9102 as well just because.

Checked as many more of the Jfets as My eyes would allow and could find no further failures, will check some more monday before I order parts.

Seems the power board did fail again, maybe the main board has something to do with it but it looks like it may be contained on the PSU.

If I made a buck an hour on this one I,d probably have made a whopping 32 bucks.

Wooo Hoo, and it ain,t over yet!
None of these whole boards seem to be available in the secondary channel.
"BN4400358B"

The last time I ran into something like this the parts were gonna cost 25 and I could get a guranteed board for 16.00 with free freight.
Maybe one will show up later if I need it.

I,ll keep you posted.

[dfergy54]

Re: Samsung UN55C6300SFXZA won,t power up

Replace the jfet and it,s back with the living.
I,ll burn in in for a while and hope it,s a done er.

Thanks for the help everyone.

[dfergy54]

Re: Samsung UN55C6300SFXZA won,t power up

Well, it ran about two hours, then heard a pretty loud pop and it went off.
Checking it out I found on the power board (BN44-0358B) that Q9201 , Q9204 and IC9201 all associated with LED dimming were bad. Already had the FQU5N40 Jfets so i replaced Q9201 snd Q9204. I can,t find a source for the chip except across the big pond, S Korea or China. ( SELC2010M, BD31L1GP, Map3201) Schematic calls out MAP3201

I am wondering now if something is amiss with the LED panels associated with Pins 5,6,7,8 arcing internally or to the chassis as I can,t find who was responsible for the Pop I heard.

I was looking at the screen properties when it popped, I noticed contrast was set at 100 percent was preparing to tone it down when it popped.

Any of you that have had any similar problems please respond.
Thanks David

[dfergy54]

Re: Samsung UN55C6300SFXZA won,t power up

This power Board must be a high failure item, not many around, found board from samsung for 125 plus freight, found chip from dubious korean source.
Think I,ll sit on this one a bit and see if parts become more available.

They wanted 10 bucks for the chip and 25 day lead time???

None at mouser or digikey.

Board bn44-00358b
Chip SELC2010M, BD31L1GP, Map3201

[jjanssen7]

Re: Samsung UN55C6300SFXZA won,t power up

Any Update on this Unit? I have the same TV with the same symptoms.