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The convergance or y-sus board can become faulty. The capcitors do tend to burn out. It is about a $250 + repair for this. Not all parts can be repaired, but they can be replaced. A capacitor tester and multi-meter are about the best tools for the job. If the price you get is over $250, I simply would replace it instead of repairing it..
this symptons is caused by a breakdown in the vertical deflection circuit. hence, the trouble may be in the vertical oscillator, amplifier or output circuit. in most modern tv the vertical ic is usually composed of these said circuit inside. the ic have many pins, standing on a heat sink and smaller in size. try to check also the capacitors surrounding it. sometimes leaky capacitor may cause this problem. good luck!
You Probably have some failing Electrolytic Capacitors in the Vertical circuit. it will only get worse and can cause the circuit to fail
all together if not fixed. Unless you are Electronically Savvy and know you way around TV circuits do not attempt to repair. Call a professional.
The problem is most likely in the vertical circuit, possibly the vertical IC itself or one of the feeder caps in that circuit. Could be possible poor solder connections on the IC also. Is the problem intermittent?
There are a number of common problems with this unit effecting the following parts:
Dp027 (27v Zener) P/N 244835
Tp022 (Bc648) P/N 198743
Ip001 P/N 257786
Ip050 Ic Voltage Regulator , Zener Diode With 3 Legs Looks Like Diode.
Tp020 (2sk2842) P/N 263692
Tp023 (2sc8550) P/N 257827
This is an ITC008 chassis built in mexico and the problem you're describing should be an inexpensive repair - but my downside opinion is that with this particular unit you could expect the next problem in about one to two years.
Being a certified technician there are few TV's that I would tell a customer to walk away from if they were considering a purchase - but this is one of them. I'm sorry for such a negative review, please don't take it out on my rating for this solution. But if you have it repaired take it in yourself and save a few bucks - and ask the shop to save all the old parts for you.