Initially happened with an especially bright image. became more frequent especially when cold. the picture skews in from the sides (variable depending upon the brightness of the signal image) - then shuts off. have had to watch snow for 10 mins to "warm it up", then could switch to a signaled channel. now will not stay on.
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it could be an electrolytic capacitor or the vertical output I.C. in the vertical circuitry,if you remove the rear cover tap on the board in different places and see if the picture fills out or atleast jitters like it might fill out,then it could be just a cold solder joint,then remove the main board and resolder all joints and this should repair the condition you have
hello. it sound's like you have a picture tube that is shorting out from a something arking in side of your set.!!! eather on the (CTR PIN COUSHION).!!! OR ON THS CHASSIE.!!! THAT WHAT MAKING IT DO THAT.!!! TIME TO GET A NEW SET.!!! HOPE THIS HELP'S YOU.!!! "GOOD LUCK"
I noticed a bright horizonal line about 1/4 in.wide centered in the middle running from side to side. Audio is fine. This just all of a sudden happened it was not gradual.
it is due to vertical section failure.
please minimise bright to protect crt.
1 check supply to vertical section.
2 check for ic failure in vertical section
3 check vertical output section parts.
Is it fixable or dumpable?? Please HELP!!!!
yes it is fixable
it is common problem not major one.
your problem is in focus control ckt.please check
1 focus wire going to crt base from flyback transformer is loose or foreign material deposited in crt base near that wire.
2 focus control mistuned.
3 if tv is old than crt is weak.
hope this will help.
Some of the problem could be a weak or damaged picture tube - especially if it encountered rough handling in the move. Other possibilities are bad capacitors in the power supply and deflection circuits which are common with this aged set. No adjustments come to mind that could permanently fix these symptoms.
I think the solution to your problem is adjustment, not of the brightness but either the `contrast' which is probably too high, or the `sharpening' if your set has this function.
Too much sharpness will cause a shimmering effect, especially where you see an edge between colours.(due to ringing at a very high video frequency).
Too much contrast can start to turn the video signal upside down, causing noise on the peak white in the picture.
Another cause is if the RF signal into the aerial socket is too large,
This can be corrected by an attenuator, costing about £2.
6dB or 10dB can be tried.