Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

[budm]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

It looks like part of the backlights are not on. This set has 4 set of LED driver circuits and 4 sets of LED strings.
What is the P/N of this power supply/LED Driver combo board? BN44-??????
What happen if you turn down the Backlights level (not the Brightness level) in the on screen user menu?

[Jeremie]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

It's a BN44-00428A. The bar doesn't go away when turning down the backlight, but if I turn it all the way up to 20 it causes the TV to power cycle and it won't stop unless you change the input and lower the backlight level again.

[budm]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

I have a feeling you have LED backlights problem, probably due to shorted LEDs.

[Jeremie]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

Is there a fix for that? Or should I just replace the TV?

[Jeremie]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

This morning I started watching a different movie and really payed attention to when the TV would cycle off/on. Any time the screen went dark for more than a second it would power cycle. As long as there is a picture on the screen, it stays on and works like normal.....if it is a shorted LED how do I find and fix it?

[johnboy1313]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

You'll have to open the panel.

[Jeremie]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

I'm attempting to open the panel on my TV but I'm not having very much luck with it, and haven't been able to find much info/how-to by searing google. Can anyone give me a couple of tips on safely separating the panel so that I can check the LED strips?

[Jeremie]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

Ok, I think I found my problem. When I got the panel apart I found that the top left LED looked a little out of place, when I touched it, it fell off. I found a replacement LED bar on Ebay for $80 plus shipping......could this loose/broken connection have been causing the TV to power cycle, or was it just what was causing the dark area at the top of the screen?

[freakaftr8]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

Possibly when there's a dark screen or a black screen the PWM dimmig circuit dims the back lights and sensors and instability in the backlight outputs between a comparator circuit the TV is going to shut down from the dimming of the backlight

[Jeremie]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

I found the part number for the left LED bar, but I can't seem to find anything for the right side. Can anyone point me in the right direction?

[freakaftr8]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

Can you solder it back on?

[Jeremie]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

I'm afraid that's a little beyond my skill level. I honestly don't even see a way that a person could the way that it broke off. I managed to find the part number for the right side, but can't find anyone that sells it. I unplugged the mainboard and then connected power to the P/S board and all but the top section of LED on both sides came on, so I think once I get the new left LED strip installed I'll be all fixed up.

[Jeremie]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

Just wanted to let everyone know that changing the left LED strip did fix my issues. The dark stripe at the top of the TV is gone and it hasn't power cycled off at all since installing the new part.

[johnboy1313]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

awesome

[budm]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

You should turn down the Backlights Level (not the brightness level) to as low as you can, that will run the LED cooler and extend the life of the LEDs.

[freakaftr8]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

Good to hear. nice work !

[Jeremie]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

Well, I'm back to having the same problem again, only this time the dark stripe is more toward the middle of the screen. I'm pretty sure the cause is from an LED that was bent while disassembling the panel assembly. My only issue no is that I can't locate a Right LED bar for the TV. If anyone can help me find a BN96-16622A I would be extremely grateful.

If I can't find one I guess I'll be buying myself a new TV for Christmas....lol

[Vassertvtech]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged

Here are some pictures of what I found. The bottom of the board appears to be normal.

Common problem with cable, part no. BN39-01475H, Google for listing of who may have part. Good luck

[thoma]

Re: Samsung UN55D7000FLXA cycles on/off P/S to M/B cable appears to be damaged



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