Magnavox Model #MS3250 C321 Chassis#32T800 7629
Just a little warning this is a long post because it's a complicated story but I summarized as best as I could while still getting all the important facts in.
I posted a little while ago about a problem with my TV turning itself off. At that time I was getting a black screen with colored lines across the middle and the TV would cut off shortly after being turned on (the power indicator light, though, would remain on). Since then some things have happened.
My television now has a grey square with white lines on the screen (it doesn't fill the entire screen)and the sound is normal. I had a "professional" do a house call to troubleshoot the problem and after testing it he said that the problem was with the IC (model #TDA6107Q/N2; part number on partstore.com= 935257650112). This part is found on the circuit board near the picture tube. The change in the picture I mentioned above occurred after he opened the back and did his troubleshooting.
Well I waited a week for the repairman to return and fix my TV and kept getting excuses about other jobs he had. I expressed my frustration to a friend and he offered to replace the part if I ordered it since he once studied electronics. He figured that even though he hadn't used the knowledge in TV repair all he was doing was replacing a part so he just needed the basics anyway. He came to look at my TV to see if he could install the part. At that time, he felt that there might also be a power problem since the TV would just turn itself off. He thought one of the electrolytic capacitors might have blown which would also explain the "popping" sound I heard before all this trouble began. He looked to see if any of the capacitors were blown and found one that might be the culprit. He then tested the capacitor with his voltage meter (or something like that; I know nothing about electronics) and found that it was not putting out the correct capacitance value stated on the side. So I ordered both the IC and the capacitor.
He replaced both and my TV is having the same problem. Absolutely no change! He also used his meter to test the resistor, R3340, which I saw was the cause of a similar problem in another post and he said that the circuit was closed. I didn't really expect the capacitor to solve the problem since my friend is, in essence, an amateur but the TV repair guy, despite his unprofessional behavior, is supposed to know his stuff! I mean the guy spent quite a bit of time testing stuff on the circuit boards. I have considered trying another repair shop to see if they can troubleshoot the problem but I really don't want to go to any additional expense if this is actually an expensive repair like a blown picture tube or something (not to mention lugging a 36 inch TV down 3 flights of stairs). I'm hoping I can get some help on here before I end up trashing a good TV that's easy to fix.
Thanks for reading and any help you can give.