Riddled TV Repair Forum

Mike · Guest

Well i ran into a curbside find today. cabinet needs work because of the way they hauled it out of thier place and put it in the curb.
However, aside from that. the set is dead. when you plug it in and press power, a relay clicks, and then you hear a faint upward chirp of the power supply firing up, then the relay clicks off and goes out. no sound, no pix.

im well aware of the yoke problem with the yoke connect boards needing resoldered, and then the STKs also needing resoldered, but i dont think this would have caused a dead set.

any ideas?

Google

Mike · Guest

well i got everything done on it. the TV works really great. i resoldered
every board all the joints. took hours to do that. the only problem is when
you hit power button, it still cliks on, and right back off.

but sometimes if you hit one of the heatsinks on the board, or hit the main
power transformer with a screwdriver or a stick, itll power up and work
fine. sometimes it wont. but i dont get it. all the joints are good. there
must be a hairline crack somewhere im not seeing.

Jon · Guest

Mike, I had a rca one time that had a loose wire wrap around one of the
terminals on the Power supply transformer . Could not see it until I removed
the entire tranformer and looked at all the pins where the wires solders to
the pins. May want to remove the transformer and inspect it really close if
its that type.

Good Luck!

John

Eric · Guest

Hi Mike look at the heat sinks as some has circuits going through the
heat sinks..Check them good..Eric

Bill · Guest

Hello Mike,

Look at each of the solder pads for each
leg of the transformer. Sounds like one
of them is broke where the solder pad
actually meets the solder trace itself.

Google

Mike · Guest

yea i pulled the tranny out. it looks ok. i hit the enamel wire up with a
fresh coat of solder anyway because they use that RoHS lead free crap
nowadays.

i went through it with a magnifying glass and there is a transistor on a
heatsink near the horiz osc section of the circuit, and you could see a
hairline crack onthe collector. so i sanded down some of that green
protectant paint and soldered from the collector down the trace a little
bit. goign to take the board back out there to the TV and hopefully this
fixes it.

Mike · Guest

yep that fixed it. stupid crack on the transistor eyelet. hehehe.