Motorola ts907 low hv

[timmy]

Lol got it.

[timmy]

When I got tubes for the set I had got 2 6eh7 tubes GE and I usually test them and in testing them they were completely dead no reading at all. Just never know what you might get. Someone should come up with solid state versions of tubes or if it can be done at all.

[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,