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Find the vertical IC and check for very small cracks on the solder joints of its pins and resolder (approx. 10 Pins). Also check in the same area for a 1 micro farad at 50 vdc capacitor that goes bad and replace it.
Hmm, you have 2 possibilities that I can think of. First, if the picture color and brightness seem relatively normal, I would replace the CRT driver on the C board. This is attached to the back of the CRT via the pin socket. Second, if you notice a darker picture or faded color during the cycling period... things are not as rosy. This is a good indicator of a High GR (gas ratio) condition. Basically, your CRT is leaking.
Try unplugging it for a minute. You will have to go through setup again (most likely).
Some of these sets have a (software?) issue and the audio drops out maybe once or twice a year-at least that's what I've experienced. No real fix for it.
Jar-Head, bad news, the picture tube has a mild short in the green cathode, tech can come out and try to restore it but it`s usually a futile attempt on sony tubes, sorry to be the bearer of bad news, BMW Rider
this problem is due to blue video circuit.
1 Please check supply to blue video ckt.
2 check crt base for loose.
3 check loose contact & parts related to blue cathode.
4 blue signal coming from processor to blue video.
5 processor it self.
6 at last if tv is very old than check crt also.(possibility is rear)
hope this will help.
Isolate filament voltage from CRT,i.e. unplug
Crt socket from pix tube.Measure filament voltage on CRT PCB.If present,suspect bad pix tube.If missing,solder any/all connects in
filament circuit,meaning CRT board first then
Sounds like you have a problem with the blue gun in your picture tube or its drive circuit.
You might remove the back cover and gently tap on the neck of the picture tube using a plastic
screwdriver handle while watching the screen in a mirrow. If the picture flashes back on or on and off then the picture tube is the problem.
If this is a projection tv you have three separate tubes : red, green & blue.
you'd need to tap the blut one.Gently!!!!
It seems your set has a loose conection in the high voltage circuits,in fact by now it should have many loose conections in different areas like the power supply and the horizontal deflection circuits,if you are familiar with tv service you can use the information as the first step to take,some of the loose conections are hard to see even for the trained technician but the one giving you this problem should not be hard to see,if you are not too familiar with tv service be safe and call for assistance from a servicer a least for an estimate.