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Blinking Standby Light + No Display

Hi guys

I’m working on Samsung TV UN60J6200AF.

When I plug in power cord, the red standby light lights up.

I measured on the power supply board, and even without pressing the power on button I am getting on CNM803 (which goes from Power supply to Main board):

UD = 2.3V

PMW_BLU4 = 3.3V

PS_ON = 4.4V

A13V = 12.75V

I looked at the manual and all the voltages are correct. But.. why is my TV not on standby mode and goes straight into full power mode?

When I unplug the main board from the power supply, LED lights are supposed to come on. However, non do come on.

I then measured at the LED connector CNL802:

D+ to D - = 419 VDC

And yes, that’s 419VDC lol.

Is it safe to assume all my LEDs are burnt? Also CNL802 only has one positive and one negative connection. I’m assuming all the LED strips are connected in series.

Does anyone know what the DC output voltage supposed to be to the LEDs? Should I try to light up the LEDs with a tester next to verify they work?

Any other ideas what to try?

All your help is much appreciated.

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@alberte70492 all of this sounds actually quite right. You seem to have some concern about the voltage to the LED's. Even that sounds reasonable. This "LED lights are supposed to come on. However, non do come on." including the voltages listed by you, would lead me to check the backlight LED's. Most likely you have a failed array of them and replacing should actually fix your TV. It is always good to verify the strips with a designated LED backlight tester. So, if you have one, go for it.

Is it safe to assume all my LEDs are burnt?

No. If the array is wired in series, even a single failed LED can have this effect.

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Thank you, I will open the TV and have a look with a tester.

Will reply back once it’s done.

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Looks like LEDs are fine!😂😳

On the LED connector I’m measuring with multimeter:

D+ and D-: 419 VDC

D+ and S-: 300 VDC

D- and S+: 0 VDC

From this measurement it looks that LED has a short. But I wanted to verify LEDs are good or not, so using SID LED tester MODEL: KT4H, I injected 210V between D- and S+ and the full backboard LEDs lit up. The voltage on meter dropped to around 113V. Then I injected voltage on D+ and S-, and the full backboard LEDs lit up. The voltage on meter dropped to around 113V same as the other loop. And all the LEDs seemed to be lit!!!

Lastly I tried to put the TV in LED force mode by unplugging the main board from the power supply, the LED lights are supposed to come on. However, non do come on.

I believe my problem is inside the power supply board. Any advice you could give me to try and locate the problem?

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@alberte70492 perfect. You know now for sure that the LED strips are working. YEs, you are right, the backlights do come on with the mainboard disconnected. That would mean this is a power board problem. Just to verify this, I measure the voltage for BLU when TV turned on and when off on the connector. Ultimately it sounds like the power board not turning the backlights on.

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@oldturkey03 thank you so much for your reply.

I was able to measure, when TV is plugged in, and motherboard cable is disconnected:

PMW_BLU4 = 3.3V

When the motherboard is connected I get:

UD = 0.065V

PMW_BLU4 = 0.1V

PS_ON = 3.3V

A13V = 12.75V

What is the power monitor Blue? Is that a chip that I supposed to pulse control voltage to IC?

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@alberte70492 that is for your Pulse Width Modulation (PWM) backlight dim but it can also turn your backlight totally off. Do this, disconnect the right side ribbon to panel driver board. See if that gives you a backlight. Reconnect and now the Left side. Anything?

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