Hey all,

Yesterday in the office something started to smell like dead electronics, I looked over at my coworker and his TV monitor appeared to have died. Today I took it apart knowing the power supply was probably the fault. Turns out I was right, although I expected a cap to have failed, it appears that the transformer was at fault this time. Here are some images of the board (I have already resoldered the connection)
https://photos.app.goo.gl/IqOpRMVod5tyx3y13 (back)
https://photos.app.goo.gl/yPDCzt9ixBTXo1tl1 (front)

I have gone thought and it appears that the caps are fine, the inductors appear to be fine and the fuse is still in tacked. As I was reflowing the burnt solder joint, I also reflowed the other terminal on the same transformer and quickly noticed that the connection seemed quite faulty, As I heated it up the connection gave in as if there was a void under the solder joint.

Anyway I feel pretty confidant that the issue here was simply a poor solder joint that slowly gave way causing arcing leaving a burn mark on the board. However I wanted a second opinion before I put the board back into the display. Is there anything I should check that I may have missed? Is my assumption valid?

Thanks in advanced!

MOD:
Uploaded and tidied your images.

 

You need to remove all that black circuit board, even if it leaves a hole in the board and you need to use wire link(s) to connect things around that point.

I had a similar problem with a high voltage capacitor in the line output of a TV. The capacitor was fine but the board was quite charred.

 

I have gone thought and it appears that the caps are fine...

Caps can get old, develop a high ESR, and cause a power supply to fail without any visual indication whatsoever. They might even still have the rated capacity, but the ESR makes them useless. Just sayin'

 

Thanks Albert, I ended up removing the transformer, using my Dremel to remove the crispy part and jumped the connection with a wire. Plugged it back in today and everything was back up and working. I think my original guess with faulty solder joint was correct. Everyone was very excited . Thanks for the tips!

Wayneh, I thought it would be caps before opening it up due to it being a very cheep TV, however the burn mark was a pretty clear indication of the root issue.

Thanks for the input everyone! Pretty happy to its back up and running!

 

Success by post #4. That must be a record. Well done!

 

I think my original guess with faulty solder joint was correct.

Thermal cycling can cause solder joints to go bad. The The lamp control module in one of my cars needs to have solder joints on some high current traces reflowed periodically.