Hello, I have a RCA tv model 20F420T, first problem was the set turned off by itself after 20 or 30 minutes, i guess caused for overheating of some component because the time decreased to 10 to 15 minutes after turned on each time.
I check solder points under the board and found a crack solder in pin 11 of flyback. I resolder all terminals of troughole components on the board and the problem still. I change C413,C411,C408,R421 and R510,R511,R512 and C504 on CRT,I check B+ and 200V is ok.
After that I decide change ICs begining with Q815, I found a replacement of this IC but I didn't realized the new IC have a metalic body on its back and caused a shorcut burning R813 and R817.
Now I have two problems, one is to find what causes TV turns off and the first I have to fix is replace burned resistors but I don't know their values so I need the schematic for this model.
Please help me with this! I would apreciate!
