Samsung LE40M87BDX - 15 Minuets To Standby

[AlbertRoss]

Hi all,

T.V turns on o.k and continues to run for approx,. 15 minuets and then clicks off to standby. I've timed this procedure 6 times now and every time almost to the 15th minuet it clicks off to standby. Pressing the front on/off switch will turn the t.v on again but after 15 minuets, same thing happens.

The only components I've replaced are three 47uF 50V caps which were giving me very weird readings when on the board, CM851, CM854 and CM881 (next to CN801)

The power board in this t.v came from another identical Samsung LE40M87BDX and it did the same thing in that one.

[tom66]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

It's not something silly like the sleep timer is it? Try a factory reset.

If the PSU board carries the fault, try tapping the heatsinks - common problem with Sammys is cold joints on the power transistors, can cause the TV to shut down.

[AlbertRoss]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

As you will see from the photo, I've entered the service menu o.k. Should anything happen when I highlight 12# and press on the remote?

All that appears to happen is, the TV button on the remote will flash and the service menu stays on the screen?

Just tried the t.v again and still the same!

[tom66]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

Since the problem travels with the PSU, I would guess the PSU is at fault...

[AlbertRoss]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

Yes, I'm pretty sure of that to. I've done a reset, made sure the sleep timer was off and then set the sleep timer to 30 minuets to see what would happen but still turned off after 15 minuets, very strange!

[tom66]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

Check the cold joints as I recommended, on the bottom of the PSU.

[AlbertRoss]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

Will do!

[GriffterUK]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

Hi there

Did you ever resolve this issue?

I replaced the capacitors and it seemed to fix the problem because the TV worked for 24 hours, but then it started switching off and on again pretty much every 15 minutes. I decided to then replace the enter PSU board (assuming something on that was causing the caps to blow in the first place) and this time it worked for much longer - about a week BUT low and behold the issue has come back AGAIN! I'm pretty much at a loss now - any ideas would be much appreciated as I really like the TV and don't really want to have to buy a new one!

Thanks.

[drpj23]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

Well it seems the powersupply is still the culprit.
I would first check for those cold solder joints tom was talking about.
If it is doing an even interval, you could try heating/cooling to see if it speeds/slows the problem.

[ben7]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

Look for cold solder joints elsewhere, like, where the cable that connects the mainboard to the PSU.

[tw2005]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

As you will see from the photo, I've entered the service menu o.k. Should anything happen when I highlight 12# and press on the remote?

All that appears to happen is, the TV button on the remote will flash and the service menu stays on the screen?

Just tried the t.v again and still the same!

I think all that reset does is reset the panel time. Notice how it shows only 5 hours now.

I did this once on a Samsung plasma and that's all it did as far as I could tell.

[jpalmeida]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

Hi!
Have you solved that problem?
I have the same problem, already bought a new psu but the problem came again after a week or so.
Best regards.
Joao Almeida
Portugal

[selldoor]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

Is your problem it switches off after 15 minutes?

Try heating gently with a hairdryer to see if heat makes it switch off quicker.

Try extra cooling to see if it stays on longer.

[satnam]

Re: Samsung LE40M87BDX - 15 Minuets To Standby

Hi,

I have the same problem here

....does anybody know the fix please.?