Motorola ts907 low hv

[timmy]

Well sorry for driving you guys crazy but it’s not a mistake the .5 is next to the .25 I looked at the wrong one my glasses are not working for me. .25 is in place and checks good. Back to square one again.

[timmy]

I don’t know if these new caps these days are any good but the original cap checks better then the new so maybe I should try the original cap it’s +20% and see what follows.

[timmy]

The 10ohm resistor is 11.3ohms

[Yamamaya42]

Originally Posted by timmy

I don’t know if these new caps these days are any good but the original cap checks better then the new so maybe I should try the original cap it’s +20% and see what follows.

if the OLD is paper, do not trust it.

now the question remains, is the IF problem still there or not?

I'd guess it's a 50/50 chance.

[timmy]

If I only had an idea what it is that tunes the focus coil. All there is focus coil L42 .25 cap 10 ohm resistor that’s it.

[timmy]

The old cap is those dark red ones. I have to concentrate on this focus issue before getting back to the IF because the L42 is going to burn up then I’m screwed.

[timmy]

The IF problem is still there

[Username1]

If you are so worried about the L42 Temp. then just put a 10 Ohm 10W resistor in
series with it, and check it's temp. and move on till you get a pic on the screen
and then you can figure it out.... I mean like a Good Pic from the tuner
with everything else working.....


I also doubt that any cap. that you replaced where the value is .1 and you put
in a .5 by mistake is causing all these problems... I hate the idea of using a
parts cannon on all these tv's before you get it working by only replacing
electrolytics, but that's what you guys end up doing....

This should be your main focus:

Every TV without a signal should produce snow on Picture & Sound
this one does not. You tracked the signal loss to a specific area, & now
need to focus on why it's getting lost. IF Amp not working? IF amp
turned off because of some AGC Fault?



.

[timmy]

Originally Posted by Username1

If you are so worried about the L42 Temp. then just put a 10 Ohm 10W resistor in
series with it, and check it's temp. and move on till you get a pic on the screen
and then you can figure it out.... I mean like a Good Pic from the tuner
with everything else working.....


.

I thought of doing that but there’s a reason why this is happening and I really wish I could get to the bottom of it then move on to video maybe this problem is related to the video problem.

[Username1]

It is entirely possible both problems are related.... But which is the chicken, and which
is the egg..... And is there a 3ed or 4th problem in there too.....
To figure out what is going on with L42 you might just have to look at wave forms
especially that + - 500V P-P as it would be most telling as to the health of that
circuit. Flyback not hot +, Focus voltage within range +, Screen is focused when
signal makes it through from test points +.

You don't know what that coil's temp is when it working perfectly, like when it
came from the factory.....? Did it run hot anyway...?



.

[timmy]

Originally Posted by Username1

It is entirely possible both problems are related.... But which is the chicken, and which
is the egg..... And is there a 3ed or 4th problem in there too.....
To figure out what is going on with L42 you might just have to look at wave forms
especially that + - 500V P-P as it would be most telling as to the health of that
circuit. Flyback not hot +, Focus voltage within range +, Screen is focused when
signal makes it through from test points +.

You don't know what that coil's temp is when it working perfectly, like when it
came from the factory.....? Did it run hot anyway...?



.

Flyback don’t get hot at all and when I injected the video at test point B the screen was focused and the focus voltage is good and variable. Just all of a sudden the coil fell out of the housing that it was in and it gets so hot you cannot touch it at all and because of this heating the ohms are going up from 35 ohms now to 53 ohms I’m sure it gets warm but not this hot.

[Yamamaya42]

It is still hot after putting in the right size C99?

[timmy]

Originally Posted by Yamamaya42

It is still hot after putting in the right size C99?

Well in a previous post I made a mistake it does have the right cap but I’m Going to try the original cap.

[jr_tech]

Originally Posted by timmy

because of this heating the ohms are going up from 35 ohms now to 53 ohms I’m sure it gets warm but not this hot.

Is that a permanent change of resistance or does the coil return to 35 ohms when it cools down to room temperature?

jr

[timmy]

It’s permanent and when it was at 35 ohms it started getting hot and went up from there.