Motorola ts907 low hv

[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.

[Yamamaya42]

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.....




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?



.

I agree with adding this resistor, you should also stick on the ceramic heat sink using thermal conductive epoxy as I mentioned, save the coil as best as you can.

[timmy]

Originally Posted by Yamamaya42

I agree with adding this resistor, you should also stick on the ceramic heat sink using thermal conductive epoxy as I mentioned, save the coil as best as you can.

With injecting video point b would the agc affect that video since it follows to the video amp.

[Yamamaya42]

Originally Posted by timmy

With injecting video point b would the agc affect that video since it follows to the video amp.

Yes and no.

If the video fed in was up to the level needed at that point, 5v ptp, it would start to fool the AGC into thinking that there is good video coming in and start to do it's thing, but since it is low at 1v, it is still like a weak/ no signal from the tuner.

[Username1]

Originally Posted by Yamamaya42

Yes and no.

If the video fed in was up to the level needed at that point, 5v ptp, it would start to fool the AGC into thinking that there is good video coming in and start to do it's thing, but since it is low at 1v, it is still like a weak/ no signal from the tuner.

This I believe is a definite NO - Mostly because the voltage of the signal is
too small as Yamama said, but mostly because the sync pulse is not
"syncing" anything.... In your screen shot it looks a lot like a Whometco
home theater image after they turned on the late night pay service.
In this pay service they use to suppress the sync pulse and the
picture locked on any semi-dark part of any image.....
What you got was a pretty scrambled image if
you were not a paid subscriber....

You had a better lock with the tuner subber on V2. That might have
done a little for your AGC, and well worth checking.... If you had
nothing else to do......

DAMM another freaking page!!!!!


.

[nasadowsk]

Originally Posted by Username1

DAMM another freaking page!!!!!

This thread needs s sticky, or its own forum. Its pushed a few other interestingnposts down a bit…