Samsung un32f5000 no video

[redtux777]

Re: Samsung un32f5000 no video

ok I have a cr2032 off a laptop with leads. with 2.54v life left on it.

Were do test the bulbs?
do I have to take the strip off the metal case?

[tom66]

Re: Samsung un32f5000 no video

2.54V is very flat for a CR2032 (They keep about 3V until 1% capacity left then fall off quickly) so I do not know if that will work.

[redtux777]

Re: Samsung un32f5000 no video

Do I test on the end of the strip or do I have to remove the strip and test them one at a time?

[tom66]

Re: Samsung un32f5000 no video

You will have to test one at a time, they are all in series (like Xmas tree lights) with some series strings in parallel (or in some smaller TVs they are all tied in series... it depends on the design.)

[redtux777]

Re: Samsung un32f5000 no video

Im going to take a shot in the dark and guess its this one...

Now what do I do? Buy a little bulb on ebay?


http://www.ebay.com/itm/100pcs-1210-...item4ad5993eba

[redtux777]

Re: Samsung un32f5000 no video

The back side of the string.

Looks like the plastic lens came off and the led overheated?!?

[budm]

Re: Samsung un32f5000 no video

It got pretty hot didn't it. I hope the other will not go out later on too.

[redtux777]

Re: Samsung un32f5000 no video

So I just snap off the old led and solder on a new one from ebay?

[redtux777]

Re: Samsung un32f5000 no video

It got pretty hot didn't it. I hope the other will not go out later on too.

So because of overheating is it best to replace just the one led? all the bulbs on the strip? replace the strip? Replace all the strips?

Is the overheating from a faulty power board?

Or is this just a design flaw and just replace the one led and pray?

Thanks guys for all your quick responses and great help.

[tom66]

Re: Samsung un32f5000 no video

It's probably a defective LED. Bottom of the barrel stuff.

You need to desolder the LED (it won't snap off easily) then replace it (if you can find a replacement), or you can replace the whole strip.

[1frankwright1]

Re: Samsung un32f5000 no video

It is a pain to remove. I have the same issue on my set.
Here is how you can also test. I used a multimeter in Diode mode as it uses 3 volts to test. I only found one LED that was bad. The other tested good but it would not be a bad idea to replace the whole strip. So far I at least diagnosed and the next step is to look at individual LEDs and or strips.

Thanks to all for info.

I attached pics. The one that I tested bad was the very top strip and led closest to power input.

[pepoexxocet]

Re: Samsung un32f5000 no video

I have the same problem.
I get 120V dc at CM847 and I get 200V dc at pin 12 in CNL802.

[pepoexxocet]

Re: Samsung un32f5000 no video

Also get these lectures at CNM803
Pin Volts
1 12.8
2 4.68
3 12.8
4 12.7
5 12.8
6 4.7
7 12.8
8 gnd
9 gnd
10 gnd
11 5.3
12 5.3
13 5.3
14 3.2

[pepoexxocet]

Re: Samsung un32f5000 no video

Sorry guys... first time in the forum and first post... I didn´t realized there were 3 pages... I will follow the whole thread first and will let you know. Thanks.

[redtux777]

Re: Samsung un32f5000 no video

Solider the new led bulb on that I got at ebay. (20 for $4).
Hard to get old one off.
I got the new one on and it worked for a bit. then shut off.
I think I need a whole new strip.
Hard to tell if I did a good job putting on the new led. And I'm usually good at this kind of repairs.

[redtux777]

Re: Samsung un32f5000 no video

It is a pain to remove. I have the same issue on my set.
Here is how you can also test. I used a multimeter in Diode mode as it uses 3 volts to test. I only found one LED that was bad. The other tested good but it would not be a bad idea to replace the whole strip. So far I at least diagnosed and the next step is to look at individual LEDs and or strips.

Thanks to all for info.

I attached pics. The one that I tested bad was the very top strip and led closest to power input.

Anyone want to sell there strips?
Anyone with broken screen?
Cant find this one on ebay

One tv die so many can live! lol

[johnsi911]

Re: Samsung un32f5000 no video

How did you access the LED strips? It does not appear easy to pull the panel. It may be too late to offer but if I isolate the problem to the LEDs, I may have some to offer. I've measured the voltages on the power supply board and they're similar to your measurements. However, I measured a rather erratic voltage across CM847. It was 120V DC but was +/- 20V which suggest a lot of ripple.