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Re: picture shrinks horizontally every few seconds.
You are changing parts in the wrong circuit. The problem is in the vertical circuit. Look for the vertical IC and resolder the pins first. It should be an LA7837 or something similar. Also, check the 100ufd and 47ufd caps in the same circuit.
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It seems that the electrical relay's, it getting completed is not able to create the high voltage required for proper display. Hence on switching it on, the power LED will immediately light up but since the circuit is not completed it switches to standby and then off. Get the relays replaced and make sure you connect the main power chord to a 15 Ampere rating wiring usually the line meant for A/c and hot water Geyser(called as high power line)..........sodeep
In older CRT televisions the horizontal power supply can start to degrade causing the picture to shrink.
Take it to a qualified repair man to have him replace the particular components that are starting to die. This repair will require identifying the particular component and replacing it.
Often times just finding the bad component can take hours of troubleshooting by a skilled technician.
Tho, before you take it in try ruling out one simple issue like bad mains voltage. Try plugging it into a different outlet in a different part of the house.
If the picture is short top to bottom then the vertical is your problem . Check the caps in this area as they tend to become weak can't fill the verticals height . The transistor you talk about if it reads 1 ohm from the collector to the base or the emitter then the set would not work , But it will read 1ohm from the base to the emitter . Check the vertical . Good luck
This set has a common problem with th main fuse opening for no other apparent reason... One of the few exceptions to my corner-stone statement that a fuse is never the cause only a symptom..
Don't replace it though with the same type grade, use a 6.3a slo-blow gma type - available at Radio Shack... Try that and if everything works you're back in business.. If not we nee to find a cause...
Sure, Why not?
It is worth the effort.
If the set is 'dead', it is the easiest to repair.Only 'tampered' sets pose problems.
It could be a simple blown Fuse, or the Power Regulator IC.
This should not cost you more than $100-150 as Technician charges + 15-20$ for spares.
It could also be a defective Horizontal Outut Transistor and short cicuiterd FBT, (tho' it seems remote), but if yes, add another $100.
definitely worth calling a professional techie