RCA CTC175 no color

[radiotvnut]

My ex-TV repairman friend brought me a few more BPC TV's today. Among them was a 20" CTC175. He told me that the CRT was bad. I'm thinking "OK, no problem, I've got an excellent tube that will fit this set". I didn't even bother to plug it in but I checked the tube and the red and blue were very weak.

After changing the tube; I had a color picture minus the green. Some checks revealed that there was no green signal coming out of the jungle IC (LA7810). OK, no problem. I've got a known good IC on a CTC177 that I just parted out (or, it functioned OK in the CTC177).

After changing the IC, I was greeted with an excellent BLACK AND WHITE picture! No color except for the menu. I rechecked my soldering and couldn't find anything wrong. I guess it's time to fire up the scope and see what's going on; but, that will have to wait until tomorrow. I hope I don't have to change that 64 pin jungle IC again! That was not a fun experience!

Before I proceed to fix this no color problem, does anyone have any information that might be useful?