UN55D6000 Blinking Standby Light

[Ltank]

Re: UN55D6000 Blinking Standby Light

On the set I worked on the A 5vdc was good but it was the B 5vdc that cycled on/off. A new PS did same thing. Itwas due toast bad LED strip. If all your Leds turn on it may be a current issue. Measure the current of each strip. Compare it to the current rating listed on the PS. Is the voltage to the LEDs correct?

[dssence]

Re: UN55D6000 Blinking Standby Light

Hi so even if all the strips all light up fine by bridging A5v to pwm1 - 4 . You say it could be a current issue. For this I would have to put my dmm in series and I don't think it would tolerate amp measurement of current going through.
What troubles me is that by manually forcing them they light up like it says here.

[w98seeng]

Re: UN55D6000 Blinking Standby Light

Sorry

[darkronin619]

Re: UN55D6000 Blinking Standby Light

Not sure if anyone is still following this…first time post. I have the same unit and believe the LED's are to blame. The main board was replaced one year ago under warranty. Since the LED's are so friggin hard to effectively replace, does anyone want the FRU boards? -OR- does anyone have a good led set they would like to sell? I got the unit for free, and really hate to junk the thing, but this looks like a trip to Costco would be much easier in time and frustration.

[mmartell]

Re: UN55D6000 Blinking Standby Light

ShopJimmy has them listed now for $55 but "out of stock". Maybe contact them and see if they can locate some for you.

The repair itself isn't so bad it's getting to the led strips that's a bitch.

[kevinm34232]

Re: UN55D6000 Blinking Standby Light

So I just got one of these in (UN55D6050TFXZA), the standby light blinks and backlight flashes intermittently, is there a way to test if it it's the LED's or the main/PS board??

[budm]

Re: UN55D6000 Blinking Standby Light

If the power supply PS-ON pin and the Backlights pin have built-in pull-up resistors then you can disconnect the cable between the power supply board and the main board, apply the AC then you will see the backlights come on right away (no need to activate the power switch).

[kevinm34232]

Re: UN55D6000 Blinking Standby Light

If I disconnect the main board from the PS, I get a constant bright blink of the backlight every 3 seconds. With the main board connected it's a dim flash about every seconds.

Although I can't find a service manual for this model, the newer manual suggests that the 2011 model's backlight should stay lit when disconnecting the connector to the main board.

My question is did the backlights blink every few seconds when the problem was confirmed to be bad LEDs?

[mmartell]

Re: UN55D6000 Blinking Standby Light

My question is did the backlights blink every few seconds when the problem was confirmed to be bad LEDs?

Not in my case however many have reported the set to reboot due to failed leds causing the backlights to come up for a short period during the cycle as in your case before the PS shuts down and the cycle starts over.

[kevinm34232]

Re: UN55D6000 Blinking Standby Light

How did you determine the LEDs were bad, did you have to expose them to see that some were out?

I thought these lights were supposed to last a very long time!

[mmartell]

Re: UN55D6000 Blinking Standby Light

Haha yes you have to separate the panel assembly from the backlight assembly. Then you can plug it in and see what's happening.

You can put a meter across each led in diode mode and see which will not light. I bet in your case bad leds will be clearly visible.

[Hookup31]

Re: Samsung UN55D6000 Blinking Standby Light

Picked this up yesterday. Was told it just turned off then would only blink and not respond or power up. Don't know how long it was sitting in that condition but when I got it home it seemed to labour (saw the Samsung logo a few times) but came to life. Watched it a few hours. Turned it on and off a few times during that period with no trouble.

Fired up again today but soon shut itself off and will not power up. Blinking standby light.

Voltage at main filter cap(s) is 390v but every 4-5 seconds there is a subtle "tick" and the voltage pulses. With everything plugged in the voltage dropped by about 40v. With Main board and Inverter (though all I see is a connector that disappears behind the panel) disconnected the voltage seems to rise during the "tick" to just over 400v.

Pics in next post. Any help is appreciated.

Hi, i'm new in the forum but came up with your same problem. Don't know if you still have the problem or the tv but i fix mine moving the potentiometer in the PSU counterclockwise 10 to 15 degrees. It is not that brighth as before but it's been working for four days now. Good Luck!

[kevinm34232]

Re: UN55D6000 Blinking Standby Light

Yes taking it apart does suck! But not too bad just make sure you're patient. I had the hardest time getting the screws out without stripping them, had to drill 2 out.

[kevinm34232]

Re: UN55D6000 Blinking Standby Light

Mine was definitely the LEDs, replaced the right side strip and all good!

Note: After going thru testing each LED on the old strip they were all good. One was shifted and touching the adjacent one, and one had fallen off completely which I may have done when removing. Seems they weren't soldered very well, or heated up too much and moved.

[kevinm34232]

Re: UN55D6000 Blinking Standby Light

OMG put it all back together, connected a source and a few vertical lines down the right side of screen. I was very careful with the panel. They may have been there before I dunno I never got the TV to come on before. What a waste..

[kevinm34232]

Re: UN55D6000 Blinking Standby Light

I got some more patience and took this apart again, the tab bonds are relatively easy to get to. Put some Bergquist thermal pad (recommended by Budm in the past) under the offending tab bond, and got lucky. Hope it holds up.

http://www.digikey.com/scripts/DkSea...70029008143555

[tom66]

Re: UN55D6000 Blinking Standby Light

You probably flexed the tab slightly when putting the panel together or taking it apart. They are so damn delicate. I *hate* taking apart panels. I feel like I'm doing open-heart rocket surgery.

[kevinm34232]

Re: UN55D6000 Blinking Standby Light

I agree, I would not have done this if it wasn't a nice larger TV.

Yea, you know how the ribbons flex around to the back of the panel with that long board attached? They had some masking tape holding it there along with the ribbons to the T-con. I thought it would be a good idea to tape that board to the top of the panel while working on the lights, but maybe that was too much flexing. Hope I never have to do it again.

It would seem so easy for them to design a small access on the sides for the LED strip.

[pablo6414]

Re: UN55D6000 Blinking Standby Light

Hi Guys. I am new here. I am working on sony kdl46hx800 with similar power problem. Got stand_by 3.3v all time. after startup PS does 3 rounds to start and ends shut down with error code (4times blinking red led).Did some troubleshooting, Disconnected harness between tcon and led backlight drivers helps to start power supply , I can here startup sound in speakers but no picture and no backlight. Suspect Tcon or backlight drivers ? Please help to determine problem, THX

[gbalab1]

Re: UN55D6000 Blinking Standby Light

Hi All,

After having read this entire thread and trouble shooting my UN55D6000SFXZA it appears that my LED light bar is the issue. I get all the right voltage levels when checking the SMPS board (standby signals switching periodically on/off) and after removing the connector to the main board (with jumper between A5V_PW and PWM_DIMMING) there is absolutely no light. I haven't opened up the panel to actually confirm damaged individual LED's.

Before I go through the trouble of tearing apart the panel I wanted to see if there are any spare parts available.
Googling the light bar part number for my panel, LTJ550HJ05-C, the part number BN96-16609B shows up but I can't seem to locate any stock.

Does anyone have suggestions, tips? Spare LED strips?

Thanks!