Hi Guys ( and gals... don't want to stereo type ;-): I have a friend with this toshiba model.... issue: in the picture there is a red horizontal line. How easy is this fix? Were poor solder joints an issue on these like the ones that plagued the older Pioneers?(too easy a fix ) IC replacement no doubt... Would you have a part number?
Thanks in advance for your attention to this request...
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If you are connecting the unit by componet cables (RED,GREEN<BLUE) check the cables first to make sure all are connected. If you find they are ok then your red tube may not be lighting up. If you are using a cable box try connectioning the set direct to the cable outlet on your wall. You could also be missing red drive signal to the CRT, in which case service is needed.
The most common cause is the emission of the CRT electron guns are decreasing. They are going out of range and of proper balance in relation to each other for the AKG (Automatic Cathode [K] Gain) circuits in the CRT drive circuits to compensate for proper colourbalance and colour tracking.
A less frequent cause are components going defective in the CRT bias and drive circuits.
I would be considering a new TV set with this type of fault condition. The cost of servicing this would be expensive.
Hi Guys, Looks like your advise took care of the problem. I adjusted the power knobs for each of the RGB guns on my Sony 51 inch projection TV. The color looks great and I don't seem to have the blinking indicator light bugging me any more. I will be sure to suggest you folks to anyone with these type of technical questions.
This problem sounds like a short inside the picture tube itself unless a driver transistor failed that drives the red gun in the CRT. You may have to take it to an authorized repair facility if the picture tube is still in warranty.
Toshibas are notorious for developing shorts in the inernal guns of the picture tube. In your case the green gun is shorted to G1. The noise you heard was an internal arc between the elements.
It is unfortunate however, the repair of this problem usually requires the picture tube to be replaced. Sometimes a savvy technician with sencore picture tube rejuvenator can remove the short. This however usually does not last. Scrivitron