Quote:
Originally Posted by Daave
I took the measurements and compared to the schematic.
Cathodes
Pins 4-13-5 Schematic said 275, I read between 275 and 280.
G1s
Pin 6 Called for 230, I read 171
Pin 12 called for 230, I read 176
Pin 2 called for 220, I read 165
G2
Pin 7 Called for 475, I read 750v
Pin 11 Called for 425 I read 763v
Pin 3 Called for 445, I read 776v
These could all be easily adjusted to the specific voltages by adjusting the gain pots. but my picture disappeared 
These were all read with the simple setup performed and a signal to the tv. I read the filament voltage and it reads on my meter at 6.09 volts, not sure if this is just a variance in my meter or the actual voltage and/or if that small amount would make any difference.
If I understand any of this, the Low G1 voltage combined with low brightness isn't a good thing., as well as the higher g2 voltage required to produce any image. Im still new, but all of that points to a weak CRT to me? Im really open to being corrected though  |
why does that point to a weak CRT, you keep saying that. Sounds more like maybe a HV issue IF by the pic disappeared you really mean it bloomed away.
IF its blooming I would check out the HV. The pic is dark because the CRT is being cut off by the low G1 voltage and the low screens. If you can get a red raster like you had then the CRT is fine.
if you really think its the CRT you should get a CRT tester. Just dont be tempted to rejuvenate it. the LAST thing I worry about is the CRT get everything else working, even a VERY weak crt will produce a watchable pic, not great but you should be able to get everything sorted out as far as color, image, sync, etc....
oh and voltages should be checked with NO signal.