Samsung LN52B630 LCD TV keeps reseting

[grumps13]

Hi,
I tried looking at some of the threads in this forum and I could not find one that matched my problem. I have done some research online on my problem and it seem that quite a few people have this same issue. My TV turns off and on. I know I have a capacitor issue because I contacted Samsung and was told that my TV was not manufactured in the time period that would qualify it for repair at no charge. So I was looking for someone that could show me the steps needed to replace them. I don't think it that difficult to do and out of warranty repairs are crazy. Any help would be appreciated.

[johnboy1313]

Re: Samsung LN52B630 LCD TV keeps reseting

I have yet to have a capacitor issue on a samsung. I'm not saying they don't happen, just that it's not always the case. An obviously bad capacitor looks like a can of soda that froze and the end bulged out. Capacitors can be bad but not look it too.

The first thing you need to do is post good clear pics of each board in the TV and one of the whole set from the back. Also, please describe exactly what the TV is doing.

[grumps13]

Re: Samsung LN52B630 LCD TV keeps reseting

johnboy1313,
I have yet to open up my TV but according to general public regarding this issue with Samsung LCD TV's, everyone keeps pointing to a capacitor issue. There was even a class action lawsuit for this issue. I was hoping someone already had posted this issue and had the instruction on how to repair it. I will try to open up my TV to see if I see bulging caps but basically my TV will randomly turn off and on. It began doing this 2-3 months ago and then all of the sudden worked fine for a month before it went back to doing the same thing. Sometimes it doesn't turn on and gets stuck in this continuous loop of trying to turn on.

[tom66]

Re: Samsung LN52B630 LCD TV keeps reseting

Bad capacitors affected the 2007 and 2008 Samsung range of LCD TVs, this includes the "R86"/"R76" UK series, the LNT4xxx series, and the LxxxA400~700 series LCDs.

[budm]

Re: Samsung LN52B630 LCD TV keeps reseting

For example: This 46" model had cycling on/off (cycling Samsung start up tone and RED POWER LED) problem due to bad caps.
http://s807.photobucket.com/user/bud...?sort=3&page=1

[truep]

Re: Samsung LN52B630 LCD TV keeps reseting

I've seen lots of samsungs with bad caps, they have various symptoms. In your case, I would replace all of the caps n the cold side (35 V and below) on the power supply.

[budm]

Re: Samsung LN52B630 LCD TV keeps reseting

Yes, you should replace them as a set not just the one with bulging top, use good caps like PANASONIC FM/FR/FC series.

[grumps13]

Re: Samsung LN52B630 LCD TV keeps reseting

So I managed to open up my TV and to my surprise I don't see any bulging caps! I have attached pictures of the back of my TV so someone can suggest anything else I can try.

[johnboy1313]

Re: Samsung LN52B630 LCD TV keeps reseting

Unplug the grey harness from the mainboard and plug the tv in. I'm not absolutely sure, but I'm thinking the backlights should come on and stay on. If this is the case, your mainboard is the problem.

[grumps13]

Re: Samsung LN52B630 LCD TV keeps reseting

I did unplug the harness cable and the backlights came on... How certain are you that it's a mainboard issue?

[tom66]

Re: Samsung LN52B630 LCD TV keeps reseting

How long does it turn on for? Do you ever see a picture?
If it keeps making SAMSUNG chime on and off, check here:
http://www.youtube.com/watch?v=7Xz-iSaEAb8
That was shorted t-con board.

[grumps13]

Re: Samsung LN52B630 LCD TV keeps reseting

It does turn on and sometimes for a very long time. I checked out the video and my TV does the same thing. I'm going to try what was suggested on the video and will post my results. thanks.

[grumps13]

Re: Samsung LN52B630 LCD TV keeps reseting

Thanks to Tom66 I've isolated the problem to the timing control board. I'm going to google the part number and purchase the part. Does anybody know of a good website? Thank you to everyone, this forum is really helpful. My next project is to figure out why my 65HM167 rear projection TV keeps burning up the lamps. I've replaced it at least 5 times. Can I keep using this thread or should I post a new one?

[tom66]

Re: Samsung LN52B630 LCD TV keeps reseting

For the other TV, make a new thread please.
What is full part # on T-con? Is it like "2009........"?

[grumps13]

Re: Samsung LN52B630 LCD TV keeps reseting

It's Samsung LJ94-02729L T-Con Board. I found this out by checking shopjimmy.com...

[tom66]

Re: Samsung LN52B630 LCD TV keeps reseting

I would search by 2009FA7M3C4LV0.4. I had a hard job finding this with the TV in the video but eventually got it for £50 (about $80 US.) Is that TV producing normal sound with the T-con unplugged?

[grumps13]

Re: Samsung LN52B630 LCD TV keeps reseting

Yes, when I unplug the T-con board the chime sound is normal. when I plug in the board the chime sound tries to go but stops and it keeps trying until I unplug the power cord.

[tom66]

Re: Samsung LN52B630 LCD TV keeps reseting

You can try hooking up a source to the inputs to confirm all of the main board is working, pressing SOURCE button on these will flick between sources.

[grumps13]

Re: Samsung LN52B630 LCD TV keeps reseting

So it seems that my issue is not resolved. I replaced the t-con board and it turned on initially but it's back to the usual. It turned off by itself and tries to turn on multiple times until it finally does. does this mean that it the main board?