Vertical Lines

Additional: What's the shape and how many pins? Thanks.

Mistake!! I have horizontal lines near top of screen!! Sorry.

the

C.

If you can't find the vertical section, it's reasonable to assume you can't find the dangerous EHT section either. I strongly recommend you find someone to repair it for you.

G=B2

On Tue, 22 Jun 2010 20:08:53 -0400, DB ??o??:

Take it to a repair shop before you hurt yourself or worse.

Listen guys. I have a 2 year degree in elect/electronics. I know all about the high voltage. I've been inside many a crt's without getting fried. I once fixed a crt monitor by replacing a dead cap. I appreciate the concern.

New development: I realized it's as if the picture size has been increased vertically to where the image has returned at the top but upside down. Is there an adjustment or do I need to replace a component? Thanks.

On Wed, 23 Jun 2010 10:18:24 -0400, DB ??o??:

I have a 35 year degree in experience on the job. The structure of your questions are a dead giveaway (no pun intended) that you should not be inside the back of a set relying on your associates degree to protect you. That is unless you wrap it around your hand as an insulator.

I believe it's called vertical fold over. I most likely need to replace a bad cap near the vertical hold IC. Which takes me back to my original question: Where is the vertical hold IC? What's the shape and how many pins? Thanks.

I've already been in there. You're not responsible. Which IC is it? Thanks.

There are two coils on the back of the CRT. The horizontal is connected to the horizontal output transformer (which is also the high voltage transformer, I'm sure you recognize it).

Now just track the connection to the other coil. This comes from the vertical output stage, which is driven by the vertical sync circuit.

If your picture is stable besides of the wrong size, its probably not the vertical IC at fault, but the power amplifier after it, or the power supply.

If there are only a few lines, and they are crossing the picture diagonally, then it's the beam which is not blanked during the vertical flyback. This can be caused by a worn out picture tube, or by the grid bias voltages. I don't know about your TV, but usually there are some potentiometers for adjusting the grid voltages and slightly changing it makes the lines diasppear. That's what it lools like:

Is yours similar to that?

Stefan

of

ou.

Then buy the service manual.

G=B2

Thanks. Finally some useful info. The symptoms look more like when the picture is adjusted to large and it folds back, to where you can see and image in the lines, but upside down. Only about 1" at the top.

On Wed, 23 Jun 2010 10:44:36 -0400, DB ??o??:

If you have a pdf document source for the schematic I'll have a look and let you know.

How do you know it's a bad IC?

Vertical hold? That went away, decades ago.

That's ok, Michael. Stefan knows what I'm talking about, and he's knows what he's talking about too.

On Wed, 23 Jun 2010 14:11:47 -0400, DB ??o??:

It's near the big thing with blue and yellow wires. That is on the side of a thing that looks like a little green round thing but should be black but if not maybe green also. Trace that thing over by the other thing and you might see a thing that matches it. If so look to the left of that thing and underneath another thing. Let me know how it works out for you.

Are you serious?

Brutally honest is the word that came to my mind. ;-)

Jeff

On Wed, 23 Jun 2010 16:12:35 -0400, DB ??o??:

Hell yes!