Trying to fix my 19-in Sanyo CRT TV

[JohnCT]

Originally Posted by Benyamin39

There is a power regulator (IC601), would that be what I am looking for?

That isn't really a power regulator IC despite what the schematic says. That is a precision voltage reference feedback IC that feeds the opto coupler.

The first thing to check is capacitor C609 in the primary circuit. Also, get a magnifying glass and bright light and look for any circular solder cracks on the transformer pins.

John

[Benyamin39]

Originally Posted by JohnCT

That isn't really a power regulator IC despite what the schematic says. That is a precision voltage reference feedback IC that feeds the opto coupler.

The first thing to check is capacitor C609 in the primary circuit. Also, get a magnifying glass and bright light and look for any circular solder cracks on the transformer pins.

John

Thx. I need to have get the ESR. Using the ohmmeter on 2000k, I can only see that the resistance rises steadily (but slowly at 4kohm per second). I checked also the solder cracks on the Transformer (T601 I believe). Overall the PCB solders look neat (at least compared to a 1990 JVC TV that I opened recently, for which there were also wild solderings done there back then; had I known I would have been more careful on the brand to purchase). After all the Sanyo TV is only 15 years old.

I will keep investigating once I got the ESR. Hopefully it is an electrolytic capacitor.