Mulja tv repair portal

Equipment Repairs => LCD TV forum => Topic started by: All Mod Cons on April 16, 2015,11:12:56

Title: Samsung LE46M87BD Power cycling
Post by: All Mod Cons on April 16, 2015,11:12:56

Hi All,
I have a Samsung LE46M87BD. It powers on and works fine for about 5 minutes. Then it starts a cycle of powering off and powering back on again every 17 seconds.
I've checked the caps on the power board. They look ok but I replaced 2 x 2200uf 10v, 2 x 1000uf 25v and 1 x 1000uf 10v anyway.  Unfortunately after this I still have the same fault.

Could anyone please suggest what else could be wrong or a candidate for changing?
Thanks, 

Title: Re: Samsung LE46M87BD Power cycling
Post by: watteau on April 17, 2015,05:27:42

Hi,
Worth checking the 1000ufd SMD's on the main PCB.
Near the large screening plate (and also the one under it),
these are getting common for type of fault.
Regards

Title: Re: Samsung LE46M87BD Power cycling
Post by: All Mod Cons on April 19, 2015,14:04:23

Hi Thanks, do you mean the other circuit board, rather than the power board?  I can't see these devices on there. But also can't see a screening place on the power board.

Thank you     

Title: Re: Samsung LE46M87BD Power cycling
Post by: All Mod Cons on April 20, 2015,13:29:19

I've just reseated all cables between the boards and it's been upd and running for about 90 minutes now with no issues.  I wonder if a loose cable could have caused this kind of fault.

Title: Re: Samsung LE46M87BD Power cycling
Post by: All Mod Cons on May 03, 2015,13:29:55

Problem reoccurred, in the end I went for a new power board, only £26 including delivery. All sorted now with no power cycling issues.