Samsung UN60J6200AFXZA....no backlights but a picture

[DXseekerMO]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

Can you post sharp pictures of your power supply board top and bottom.

Sorry was this for me?

[Cschares87]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

BN44-00670A is the power supply ill get some pictures when get home.

[budm]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

Interestingly enough I had over 400v indicated on one pin to the LED's on my TV.

Power supply model BN44-??????
Pictures of the board will help.
400V! to me that looks it is not seeing the load (LED).

[budm]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

BN44-00670A is the power supply ill get some pictures when get home.

May be you should start your new thread because we are trying to work with you and OP at the same time and we get confused.

[dick_barton]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

Sorry, answer was for DSchares87 but Bud is correct to suggest that he/she start a new thread to stop confusion.

[DXseekerMO]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

Ok now that I know, I'm done working on this TV so if that poster finds it convenient to post their question here it's OK with me if that helps?

[Curtis.schares@gmail.com]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

Here are some pictures of the power supply, the Diodes look like they got hot. But they tested ok. Thanks!

[Curtis.schares@gmail.com]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

I would have made my own post but the form rules don't let you. I apologise.

[dick_barton]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

If your board is as attached then it says the led voltage is 201V. If you are reading higher than this then it would be indicative of faulty led(s) or an open circuit in the led string connectors or connections.

What voltage do you have on Pin 2 of CNM803 (PWM_DIM)

Photo courtesy of Shopjimmy

[Curtis.schares@gmail.com]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

I don't remember exactly but it was 13v or 5v I think. I did the flash light test and could see the menu no problem. I thought it was the LEDs but the hot spot on the board had me concerned the power supply could be bad also. I was just wondering if there was any way to test the LEDs to make sure they are bad before I order new ones. Thanks.

[budm]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

Those tow hot spots are part of the LED driver circuit, so may be it got hot due to some of the LEDs shorted out first and then finally went open circuit, so something like this you need to check the LEDs to make sure they are OK or not.

[Curtis.schares@gmail.com]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

Thanks but how do I check the LEDs to see if they are open?

[budm]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

https://www.badcaps.net/forum/attach...2&d=1522432537
See those 4 LED test points TP1 ~ TP4 in the LED drivers section? You will very skinny probe tips to get to the test points.
TV is OFF, then you will leave the black probe on the chassis, red probe on TP1 then turn on the TV while watching the DC Voltmeter to see how high it goes up too, this will happen fast so you must keep your eyes on the meter, record that reading then, turn the TV off and repeat the same procedure on TP 2, 3, and 4.
Or you can spend about $30 ~ 40 for the LED tester which will give you Forward Voltage (Vf) reading of each LED string to see if they are all the same or not, I would get the LED tester to make it much easier to locate the problem, it is not 100% but better than nothing.

[Curtis.schares@gmail.com]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

I've tested all of those they are 320V, I think they are supposed to be around 200V. I tested the LED strips for an open and I found one that does not test the same as the others. It is open when they others have a reading. So I'm almost sure I have an open on one of the strings. But why are all the strings black and not half when it has 2 different supply that feed them? Thanks.

[CapLeaker]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

an error in one string turns off all back lights.

[tahoe]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

Hi I need help with a UN60J6200AFXZA
- installed New LED strips from Shop Jimmy..
- No Backlights when Main Board is disconnected.
- Replaced LED Diode, D9001C and MOSFET Q9001C
O Volt reading (between Black and Grey wires on LED connector) when LED cable is disconnected
- Replaced QP801CS and QP802CS
Still O Volt reading (between Black and Grey wires on LED connector) when LED cable is disconnected
Any ideas?
thanks

[HutchAmpMan]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

Interestingly enough I had over 400v indicated on one pin to the LED's on my TV.

Do you have an LED tester? If not, they are only about $30-$0 from Amazon. It will let you know if you have bad LEDs. With that voltage you mentioned (it's the unloaded voltage from the PSU) it probably is an open LED strip.

[Diah]

Re: Samsung UN60J6200AFXZA....no backlights but a picture

Hi I need help with a UN60J6200AFXZA
- installed New LED strips from Shop Jimmy..
- No Backlights when Main Board is disconnected.
- Replaced LED Diode, D9001C and MOSFET Q9001C
O Volt reading (between Black and Grey wires on LED connector) when LED cable is disconnected
- Replaced QP801CS and QP802CS
Still O Volt reading (between Black and Grey wires on LED connector) when LED cable is disconnected
Any ideas?
thanks

when you disconnect the MB from PCB, the BL socket should be in place then the BL circuit on PCB turn on... your work after replacement parts always with out BL socket.. and this is wrong as LED strips in total are part of the circuit