Motorola ts907 low hv

[timmy]

This is what I got and it would flicker to almost a picture but this is it.

[timmy]

This is all I get

[Yamamaya42]

since video input was OK, this may be a Tuner or IF problem.

[timmy]

This picture was taken just before shutting down and pulling the 6hs8 tube

[Yamamaya42]

unfortunately if this IS an IF failure, there is no way to track it down unless you know someone who has a piece of equipment like a Sencore VG 91 Universal Video Generator, and can trace which area has the fault.

It also takes exp to use.

If it is the tuner, yo can try to use a sub tuner like.

https://tinyurl.com/2fabnfdu

i have one of them and they DO work!

[Yamamaya42]

since you have no alt way to feed in a tuner source. a start would be a new set of tuner tubes, if this has not been done already.

esp the mixer/osc

Sams shows 2 diff tuners so you will have to look for what you have.

That pic you posted looks like a very weak input signal that the TV can't lock on.

as stated above, this can be because of Tuner and/or IF section.

[timmy]

While it does look like a weak signal but it will flicker and get really clear and a picture will almost appear I was able to see a person but then it went back to the snowy image.

[Yamamaya42]

Possible AGC problem?

Has the new V6 (6HS8) been put in?
This is the point one would use a scope to look for the 450v signal on pin 3 of V6, and the others.

Is the AGC line at tuner plug .4v? (pin3)
Bad M1/C8/C18/C14?

What is the video source? ( macrovision problem? )
have you tried changing the rf modulator input from CH 3 to 4, and see if 4 is any better?
Sometimes there is just too much rf interference on CH 3, and trying another may help.

[timmy]

I didn’t get the 6hs8 tube yet and the sound at one point seemed better on channel 4 and I use cable and the same line is good on all my other tvs.

[timmy]

I believe I changed those 3 caps already but m1 is a fuse wire if that’s bad then no power to the set.

[Yamamaya42]

Originally Posted by timmy

I believe I changed those 3 caps already but m1 is a fuse wire if that’s bad then no power to the set.

that should have been K1, the couplet for AGC, I saw it wrong, the schematic is a bit fuzzy. :/

[timmy]

Where did you see k1 I can’t find it.

[Yamamaya42]

http://suzaku.live-evil.org/k1.jpg

it can be located via page 6 on the SAMs, left side 1/2 way down,

[timmy]

Ok that’s the network that has several legs on it I believe.

[timmy]

If that’s bad I Doubt I could locate that part it looks like it could be made up it’s all resistors.