RCA XL100 portable with a dark screen

[zeno]

The part is a coil.
Try adjusting the G-2 control.
Measure G-2 use a meter good to 1KV. Normal is abt 400VDC.
Measure the cathodes. If they are up to 200 VDC the set
has a video problem. If apx 120-150 VDC video is normal.
Longshot, pull & check the CRT socket for overheating. Some
early RCA in lines would get a poor fillament connection.
Last is a dead CRT, more on that later.......

73 Zeno
LFOD !

[Sealtest]

Originally Posted by zeno

The part is a coil.
Try adjusting the G-2 control.
Measure G-2 use a meter good to 1KV. Normal is abt 400VDC.
Measure the cathodes. If they are up to 200 VDC the set
has a video problem. If apx 120-150 VDC video is normal.
Longshot, pull & check the CRT socket for overheating. Some
early RCA in lines would get a poor fillament connection.
Last is a dead CRT, more on that later.......

73 Zeno
LFOD !

Sorry about my lack of experience regarding Tv's (I mostly just repair audio), so a lot of that went over my head. Where is the G-2 control and what is it?

The cathodes are the pins on the tube, correct? When poking around with a meter I can only get a few volts off those. The neck board seems to be receiving low voltage. So far nothing on the main board has stuck out, and the power supply seems to be alright.

This Tv is just so attractive looking when sitting on my bench that I have to keep messing with it. Hopefully it'll live again.


Also, earlier in the thread I mentioned seeing snow. Must have been my eyes playing tricks because I can't see any snow at all, though the screen does put out some static.

[zeno]

G-2 usually on the HV transformer or a seperate white block that
plugs into the CRT socket. Almost always its near the focus control.
Sometimes its called "SCREEN".
Be sure you have a good ground. Use either the CRT shielding
or the shielding around the IF stages. There also should be a
layout chart in the back to help you.

73 Zeno
LFOD !

[zeno]

OK gents its a CTC87A. RCA's 1st non modular SS 13". Remember
those boxy ones with all the FBT's ??

Anyhows the G-2 A.K.A. screen control is on the right rear by the
horz & vert hold controls.

CRT voltages
pin 12 G cathode 133V
pin 3 B cathode 128V
pin 8 R cathode 128V
pin 9 G-1 19V
pin 10 G-2 350V
pin 1 focus 7.5 KV !! HV probe only !
Look for a way off voltage.

73 Zeno
LFOD !