1979 GTE Sylvania GT Matic CX9164W chassis E24-3

[pac.attack76]

Ah, ok, I'll check and update.

[pac.attack76]

I'm not getting anything with it out. Just the #1 at far left.

[zeno]

Your meter has a diode / transistor test, the diode symbol.
Look up that function in the manual, too long to type out.
OR look for some tubes teaching it. You will be using it !

Zeno

[JohnCT]

Originally Posted by pac.attack76

I'm not getting anything with it out. Just the #1 at far left.

If the transistor is reading open with it out of circuit, then something else is wrong. If this has a separate damper diode, the diode would be the next suspect because of the punctured tripler. Note that some transistors had the damper diode built in. Yours being an earlier SS design probably has a separate damper behind the horiz output socket (most) or on the main board close to the horiz output.

Is there a schematic on-line? (I scrapped all my paper schematics and most of my SAMS about 15 years ago)

John

[pac.attack76]

I'll see what I can find.

[pac.attack76]

I can't find a schematic and I have no idea where the damper is on this 😞

[Alex KL-1]

The diode damper probably will be the largest cased diode near the flyback, connected at least to some pin of it, sometimes in parallel with HO transistor, and other side (cathode) generally is ground on simple TV's (if is separate, like John said).
Of course, for some TV's, other or others diodes can be associated to primary winding, but is more common on newer TV's (like supply for RGB video output). So is good to check diodes nearby the flyback to be sure.
Another potential part suspect can be the pulse capacitor, the one that tune the flyback pulse, and is rated at least with 1600V (some nF), also near the flyback, and probably at same line with HO transistor. Polypropilene on newer TV''s, and perhaps something-with-oil on older TV's. Normally this fails open, but to be sure, is good to check.

[JohnCT]

Originally Posted by pac.attack76

I can't find a schematic and I have no idea where the damper is on this 😞

It might be right on the back side of the socket of the horiz output. It can either be a black barrel body or a grey round ball - either will have fairly thick leads.

Electrically, the cathode of the diode will be connected to the collector (metal case) of the horiz output and the anode connected to the emitter of the transistor (ground). If you look behind the socket, it should be there.

If it's not, trace the wire from the collector (screws are collector) to the main board to locate the diode.

Clip or unsolder one end, reinstall the horiz output, and see if the short to the case is gone. If it is, the diode is shorted but do NOT run the TV without the damper connected or you will immediately destroy your horiz output which right now is still good.

John

[pac.attack76]

Can't find anything in that mess. So much going on in there. I took a few shots hoping someone recognizes something. I see the back side of the output, screws and wires running down.