Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm up

[Leplus]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

Need to check main cap with probes across pos and neg of cap. Caution several hundred voltes DCV

Shit, sorry, I had the probes connected to check capacity of a former measure. Let me check again.

My meter is to 750 ACV/ 1000 DCV max. Could he die? xD

[dskall]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

Need to check main cap with probes across pos and neg of cap. Caution several hundred voltes DCV

[Leplus]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

And also, after rebooting several times, tv kept working on EXT 1 (RGB), then I tried to change it to DTV but screen was black like in the videos, and then began the rebooting cycle.

[Leplus]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

Voltage of main cap on power board

Practically 0 (AC)

[dskall]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

Voltage of main cap on power board

[Leplus]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

Some more info if it helps:

- In DTV source, no image and rebooting.
- In EXT 1 (RGB) perfect image and rebooting.
- In EXT 2 (AV) image pumping the colors like in the first video and rebooting.

[Leplus]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

Just replace the 2 caps that i mentioned and get back with the results

Nothing, I replaced them but same result about image and rebooting.

I would be checking voltage regulators on mainboard. What is voltage on your main brown cap?

Mmmm, if you could show me which ones are the voltage regulators because I don't know, let me google it up

The brown cap was under the shield, could I remove the shield with the tv on? Because there are cooling square "things" xD on top of two chips or whatever those are

[dskall]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

I would be checking voltage regulators on mainboard. What is voltage on your main brown cap?

[ducky29]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

Just replace the 2 caps that i mentioned and get back with the results

[Leplus]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

Caps identified in the first picture. There is one that I can't see its number.

[Leplus]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

Replace 52 and 58

Ok, haha, I have to go to buy them now.

I can upload detailed pictures of the power supply if you need. Give me a moment.

[ducky29]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

Replace 52 and 58

[Leplus]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

Can you list all the components in the power supply that start with CM?
(Caps starts with C, Resistors with R etc)

There you go, I think I'm not missing anyone else.

CM851
CM852
CM856
CM858
CM861
CM804
CM807
CM808
CM809
CM812

[vinceroger69]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

yes try heating the mainboard from cold for a good few minutes see if set turns straight on if not try doing the same to the power supply i have had good success in fault finding with this method.

[ducky29]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

I already replaced the caps mentioned before but no change, tv is still failing.

Any other idea?

Can you list all the components in the power supply that start with CM?
(Caps starts with C, Resistors with R etc)

[Leplus]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

try heating/cooling the mainboard and see if you can make fault appear quicker then narrow down the area your heating/cooling.

Yep, I tried that at the beginning but I didn't get anything clear, I'll try again heating from tv cold, I don't have anything to cool it down, just wait and blowing xD

[Leplus]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

This is not even related to the caps. Anyways get back with the results after you finish replacing all the caps that everyone mentioned above, so then I can help you.

I already replaced the caps mentioned before but no change, tv is still failing.

Any other idea?

[ducky29]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

This is related to the caps. Anyways get back with the results after you finish replacing all the caps that everyone mentioned above, so then I can help you.

[vinceroger69]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

try heating/cooling the mainboard and see if you can make fault appear quicker then narrow down the area your heating/cooling.

[Leplus]

Re: Samsung TV LE32M87BD image issue, turns off by itself, works perfectly after warm

because its a common problem with these boards, and there is loads of posts about the these caps.

+1

Nah, I changed both caps but the problem remains, same behaviour like in the videos.

It sucks because at first tv works always, so I have to wait for a couple of minutes to know whether the changes worked or not haha, but then it fails.

Another thing, my friend told me that the night that the tv began to fail, tv turned on by itself two times in the middle of the night until he plugged it out. Just if this info is valuable.

So, any ideas of what more to change? XD

Edit: From the dtv source I don't get any image, just the menus, but from scart source I get image but with the colors pumping until tv turns off.