Seiki SE39UY04 won't turn on - there's a scorch on the power board. Do I resolder?

[dharmaturtle]

Hi all!

My Seiki SE39UY04 turned off while I was using it and I smelled fried electronics. The red standby LED turns on but pushing the power button does nothing.

There's a scorch mark on the power supply board. Flipping the board over, it looks like the solder at a joint somehow... evaporated. There's very little solder at that joint anymore - certainly not enough to create a solid connection.

Should I stick some tinfoil there and see if it fixes it? If not, wat do?

Thanks!

[nomoresonys]

Re: Seiki SE39UY04 won't turn on - there's a scorch on the power board. Do I resolder

Just resolder that one and the 2 next to it, see how they are cracked, then test it, be ready to turn the power strip off fast, in case it starts smoking again or anything.

[R_J]

Re: Seiki SE39UY04 won't turn on - there's a scorch on the power board. Do I resolder

It just needs to be resoldered, You should also resolder all the transformer connections on that board, and any other connections that use those rivets around the pins. No need for tin foil

[budm]

Re: Seiki SE39UY04 won't turn on - there's a scorch on the power board. Do I resolder

It just needs to be resoldered, You should also resolder all the transformer connections on that board, and any other connections that use those rivets around the pins. No need for tin foil

+1, check and re-solder legs of component that are mounted on the heatsink too. You can see so many bad solder joints on that board.

[dharmaturtle]

Re: Seiki SE39UY04 won't turn on - there's a scorch on the power board. Do I resolder

Sounds good, I'll have access to a soldering iron next week.

Does anyone have an idea of how/why this occurred? My best idea is that a partial fracture occurred, and the remaining connection wasn't "electrically large" enough to handle the current going through it, and so it turned into a sorta filament and heated itself to the evaporation point. Or something...?

[R_J]

Re: Seiki SE39UY04 won't turn on - there's a scorch on the power board. Do I resolder

It is likely the connection did not get enough solder when they manufactured it, the transformer does vibrate and also the board heats and cools flexing the joint untill it failed and due to the higher voltage on that pin it arced. This has happened on circuit boards for a long time.

[petehall347]

Re: Seiki SE39UY04 won't turn on - there's a scorch on the power board. Do I resolder

remove old solder and give the connections a good clean so the solder sticks .

[dharmaturtle]

Re: Seiki SE39UY04 won't turn on - there's a scorch on the power board. Do I resolder

Resoldering that joint fixed it! Thanks everyone!

Is there a way to edit the title? I'd like to tag it as [Solved]

[nomoresonys]

Re: Seiki SE39UY04 won't turn on - there's a scorch on the power board. Do I resolder

Glad to hear it, thanks for feedback.