Fix Samsung SyncMaster 931 BF power cuts out turns off, won’t come on, buzzing noise. Easy Repair!

Published by bargainspares on November 21st, 2011 - in News and Articles

board 300x268 Fix Samsung SyncMaster 931 BF power cuts out turns off, wont come on, buzzing noise. Easy Repair!

Samsung SyncMaster 931 BF Replace the caps outlined

I sat here at my computer tonight and tried to turn on my monitor, it’s been getting a bit temperamental over the last few months, you have to keep turning it on and off and on to make it stay on when you first power up the computer. Well tonight it just wouldn’t stay on, luckily I run a dual head monitor set-up so I could still compute, but still I want my screens working as they should. Maybe I’m expecting too much, after all I did buy the pair for £40 on ebay second hand. They were only manufactured in June 2007 so I would expect more life out of them yet, after all those TV’s from the 70′s are still burning strong after 4 decades, so why shouldn’t my monitors?!!

badcaps 300x248 Fix Samsung SyncMaster 931 BF power cuts out turns off, wont come on, buzzing noise. Easy Repair!Anyway, try not to cut a short story long! I’ve fixed it, in less than an hour, including getting the parts, here’s how…

1) Firstly unplug the cables and remove the stand using the 3 screws.
2) Put the screen on the desk face down, remove the 3 screws at the bottom of the case.
3) Unclip the rear of the case from the front, remove the rear out of the way – be careful with the clips.
4) Unclip the wires that all go under the metal box in the centre, you’ll have to unclip the shiny metal box on the left.
5) Lift out the whole metal back control box assembly
6) Undo the 3 screws that hold the power adapter board in place and unclip the last wire
7) Go to maplins and buy:-

2 x DT70M (1000uf 25v Radial Electroltic Capacitor) @ 44p each
1 x DT66W (470uf 25v Radial Electrolytic Capacitor) @ 31p each

8 ) Unsolder C113, C112 and C316 from the board, you will notice the tops are bulging as per photo, remembering polarity direction
9) Solder in the 3 new capacitors in their places
10) Put the whole thing beck together making sure all the wires are plugged back in
11) Enjoy your Syncmaster monitor all over again!

newcaps 300x279 Fix Samsung SyncMaster 931 BF power cuts out turns off, wont come on, buzzing noise. Easy Repair!Also from reading on other sites, many of the other models of monitor have the same issue and also some of the LCD TV’s. The power board won’t fire up all the internal electronics right if those caps are bad. Mine was also making a high pitched buzzing noise on certain brightness levels which now has gone away with the new caps. I should buy another set in case the other one fails, which I bet it will. I bet those capacitors are cheap to make sure the product doesn’t last too long.