"Mark D. Zacharias" wrote in message
et...
|
| "Beemer" wrote in message
| k...
| My Sony CRT TV Model KV-M1420U has developed a problem. After 15
minutes
| of perfect picture, the picture fades out by going through a colour
| change
| to purple then totally black. All channels are affected. Switching
off
| for a few minutes recovers the picture but the situation repeats.
|
| Anyone one got an idea where I should start to look for this thermal
| problem? I am trained and familiar with working with high voltage and
| electronic circuits but I'm not a T.V. engineer.
|
| Beemer
|
|
|
| Perhaps the CRT filament voltage dies off?
|
| Mark Z.
|
|
|
Mark,

Only guessing but is there a heater for each primary or is a common heater
normally used?

Would the heater voltage be around 12V?

Beemer