Thanks Art for your reply. No I haven't tried removing the conv yok
connections. What bothers me is that normally, you hear a steady "buzz"
when the CRTs are on. I'm assuming that's the current going through
coils sound. But there's absolutely no sound except the normal, clear
audio for for any tv station. But I'll try what you stated. I'm
assuming the convergence yoke connections are the (looking at the
schematic) 7-pin connections with Return and Drive lines on each of H
and A side (not sure what H and A stand for). By the way, when you say
"repair the convergence circuitry" are you implying that I change the
convergence ic's (the TWO STK392-110 ICS)? Believe it or not, about 2
years ago, I changed both of those when I was having some bluish/red
convergence problems and it did the trick. I really don't think it's
the same problem though.

Thanks again. I'll report back after I try this.

Steve

Art wrote:
Have you tried removing the three convergence yoke connections to the

convergence correction circuit and try to switch the set on? It may
come on
with a very distorted, out of registration raster-picture. If it
functions
repair the convergence circuitry.
"stevie0027" wrote in message
ups.com...
Hello. Tried doing a lot of troubleshooting on my 61H70. Have
normal
Sound, but no picture at all. CRTs don't fire. Probed various
points.
Have 220v coming into the CRT Drive boards. Have at least 170v at
pin K
of each of the R,G,B board's V901, V902, V903.

Here's where I'm suspecting the problem. The nominal voltages shown
on
my schematic (if I'm reading the RED voltages next to the pins
correctly) shows that R , G, AND B lines of the 7 pin connector of
the
CRT -D/G board should be at around 3.0 volts. I'm reading 1.5V.
Traced
these lines back to the SIGNAL/CONV board's Q510 VIDEO CHROMA IC
(56-pin, ta1316n or ta1276an) and pins 41, 42, 43 (B, G, R
respectively) should all read around 2.5 volts. I'm reading 0.7
volts.
Did a couple of readings on other pins on this ic and seems to read
normally (eg: pin 30 reads 4.5v as it should).

Question: is this Q510 ic typically the cause of this type of
problems,
or could the other parts around this ic cause it? I would be
grateful
if any of you technicians (or handymen) who have worked on 61H70,
61HX70, 50HX70 and similar models would share your experiences.

Thank you!
Steven L.