Samsung un48js8500

[Martin0101]

I have a samsung tv un48js8500 that when i plug it to the power outlet o get a black screen but the standby light blinks 6 times.. I switched the tcon and main boards and still have the same issue. If i disconnect the main board from the power board i get nothing but the clicking on the power board.. if i disconect the tcon from the power board i get backlights on and standby light blinks.. anyy helpp

[budm]

Re: Samsung un48js8500

For us to help we will need good clear pictures of the whole backside of the TV showing all the boards, and the straight shot pictures of the whole top and bottom side of the power supply board so we can read the printed texts on the board.
It is hard to do long distant troubleshooting without seeing what we are dealing with.
What is the history of the TV? Any works were done to the TV before?
The more details we get the better chance of finding the cause of the problem.
What is the power supply board P/N? BN44-?????

[Martin0101]

Re: Samsung un48js8500

Power supply board number is BN44-00833A

[Martin0101]

Re: Samsung un48js8500

Pic

[Martin0101]

Re: Samsung un48js8500

Power board

[Martin0101]

Re: Samsung un48js8500

Tcon

[Martin0101]

Re: Samsung un48js8500

Main board

[budm]

Re: Samsung un48js8500

So you remove just the small cable from the T-CON to the power supply board the backlights come on and stay o, correct? That means at least the LED backlights and the LED driver and the power supply for the backlights circuits are OK, and at this point you can turn the TV on and off without problem, right?
That small cables from T-CON provide the backlights dimming control so it sounds like those control signals from T-CON are stuck low ( you can verify by checking those PWM pins DC Voltages on the power supply board with and without the connector CN9003 in place.
Did you also try replacing just the T-CON board only without replacing the Main board?

[Martin0101]

Re: Samsung un48js8500

Yes backlights come on when i remove the small cable fron tcon to power board.. but here is another problem.. i cant turn on or off the tv doing this steps... yes i try first just replacing the tcon and had the same problem.. so thats when i decided to get a new main board and still the same

[Sleddriver]

Re: Samsung un48js8500

OP: I'm currently working on a 48J5000 set, with a BN44-00852A PS. Yours is much more robust than mine! No doubt due to being an 8000 series rather than a 5000.

[Martin0101]

Re: Samsung un48js8500

How do i know what the problem is ?

[nomoresonys]

Re: Samsung un48js8500

Pics. are out of focus.

[nomoresonys]

Re: Samsung un48js8500

http://www.shopjimmy.com/samsung-bn4...wer-supply.htm If your board matches, test all pins on CNM803, theres a legend/map located just below the big number 48 on the board, tells you what the pins are, test in standby and when you hit the power button, report both conditions, example pin 13-A13v, 0 v standby, 13 v tv on, something resembling that, meter set at 20 vdc, black probe to ground, chassis of tv is ok, red probe to pin.

[Martin0101]

Re: Samsung un48js8500

I have already bought new power board maind board and tcon board and same problem

[nomoresonys]

Re: Samsung un48js8500

http://www.shopjimmy.com/samsung-bn4...wer-supply.htm If your board matches, test all pins on CNM803, theres a legend/map located just below the big number 48 on the board, tells you what the pins are, test in standby and when you hit the power button, report both conditions, example pin 13-A13v, 0 v standby, 13 v tv on, something resembling that, meter set at 20 vdc, black probe to ground, chassis of tv is ok, red probe to pin.

Here's the test you need to do, nobody can help you if you can't follow simple test procedures.

[nomoresonys]

Re: Samsung un48js8500

I have already bought new power board maind board and tcon board and same problem

Where did you get these "new boards" from?

[nomoresonys]

Re: Samsung un48js8500

http://www.shopjimmy.com/samsung-bn4...wer-supply.htm If your board matches, test all pins on CNM803, theres a legend/map located just below the big number 48 on the board, tells you what the pins are, test in standby and when you hit the power button, report both conditions, example pin 13-A13v, 0 v standby, 13 v tv on, something resembling that, meter set at 20 vdc, black probe to ground, chassis of tv is ok, red probe to pin.

Here's the test you need to do, nobody can help you if you can't follow test procedures.

[Martin0101]

Re: Samsung un48js8500

I get them from ebay
Okie i will do that

[Martin0101]

Re: Samsung un48js8500

I get them from ebay
Okie i will do that

[nomoresonys]

Re: Samsung un48js8500

Ok, so their "new" from ebay possibly "used boards" that's why they need to be tested.