Sanyo CPT3240 no image troubleshooting

[vol.2]

It could be a component in the power supply or something downstream loading it down. Either is possible.

Originally Posted by ostlar

I've checked it thoroughly for cracked solder joints four times now, I see nothing.

That means nothing. Many, possibly most, cracked solder joints can only be seen with a microscope. What happens is that they heat up and expand as and then start to develop a layer of corrosion at the interface

You could have cracked solder joints all over the place and end up chasing your tail around looking for a ghost

There are some electrolytic caps marked "NP" which I'm guessing is non-polar?

Yes. NP or BP both mean non-polar or bipolar. Same thing.

I think you need to hunt for the schematic. You need to see what's connected to that resistor that's smoking and test it all

I tried to find a manual and struck out as well. They might know something over on the antique radio forum.

Another thought is that this chassis is probably used by a different US retailer like Sears or some department store, and you would have infinitely more luck finding that service manual, if you could figure out what the alternative model/chassis number is. I took a quick look on Sam's for something that might match and couldn't find it, but maybe someone here or elsewhere might recognize it

without the schematic, I wouldn't be too much use for you doing remote troubleshooting. Username1 and Zeno are the heavy hitters here, and they might have some things to try

Best I can suggest at this point is to look what the resistor that heats up is connected to by traces and start testing everything you find. There's definitely a bad part in there if it's smoking