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Check C2P05[ location on convergence board]. This is a 16volt 100Mf cap that is bad. And check out C2V29 [cap value is 16volt 22 Mf.] And still while you're at it, resolder the pins on the convergence ICs.Should fix your TV!
Ok this problem is coming from either your tv sets vertical circuit or the tuner itself is faulty, most likely the problem is coming from your vertical circuit with bad solder on the vertical ic or you have a faulty capacitor which can also cause this problem what i would suggest unless you have electronic experience on troubleshooting electronic components is to take it to near by tv repair shop and have then troubleshoot this circuit to see which component is giving you this problem, thank you,hope this helps.
I have the same TV built in 99. My problem is similar but the vertical hold gives out when the tv warms up about 5 minutes. I will attempt to locate the vertical hold circuit and replace any parts I suspects may be the problem. I suspect a cap is leaking or transitor around IC700 is degrading when warm.
I have seen this many times. There is a 9 volt regulator on the small signal board that causes this. The regulator goes bad and the 9 volts starts dropping, especially at start-up when the regulator is cold. If the voltage is below 8 volts then the picture gets dark and the vertical becomes unstable, with the picture squeezing down and/or rolling. As the regulator warms up the voltage starts rising back towards 9 volts and the symptoms start clearing up. There are 3 regulators in a row on the board and the regulator in the middle is always the bad one. Replacing that regulator should cure your problems but it should be replaced by someone experienced in servicing Mitsubishi projection TV's because pulling the chassis out is quite tricky.