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You will have to search for a TV repair shop, and see if they have another 45" Mitsubishi TV of the same model, or close. You may be able to get a replacement screen from salvage. As for the vertical hold, in some cases you may believe the vertical IC is at fault (we will come back to this), may be not. The first suspicion is in the signal board. The signal board is the board with all the RCA jacks and RF connections. Pull this board out and replace Capacitor (location C2V29) this is a 16 volt 22Mf capacitor. Also replace C2P05 which is a 16 volt 100 Mf cap. This will correct your vertical problem. If you can find an ESR meter, I would certainly check all the capacitors in the signal board. You will find several weak capacitors to replace. The two already mentioned are extremely weak or bad. As for the other board (power supply) you may have to resolder the pins on the vertical IC. It will be located on the corner of the board. I do not remember the location. It is mounted on a heat sink, the vertical IC will have a number such as LA78XX. (LA7838, not sure). Resolder the pins on this IC and check the capacitors in and near this IC. I have not received much problems with this power supply. As always, inspect both boards for bad solder grounds and resolder as necessary! Thanks for asking and show all hands of support!
to me its sound like your on the right track. there isnt a physical vertical hold adjustment. more than likely the vertical hold ic has failed. send me your email addy to email@example.com and i will be more than glad to email you a service manual
Vertical hold needs adjustment. Check for vertical hold preset and adjust. If no preset present in the P C B of the TV, try through service mode adjustment. Service mode adjustment possible only by the authorized service provider.
You better take this fellow to a doctor. You have a stamp size IC with about 250 pins that is bad. Only a tech can replace this or reinstall a remanufactured board into this TV. You may ask the tech to use a freeze spray to find this IC first and then he wil decide how to operate!l
Your having trouble with the vertical sync/deflection circuitry. Probably a driver since it clears up after it gets warm. Could be as simple as a cold solder joint but it's not something you can do yourself unless your a tv repairman.
Loss of vertical sync or any other problem with your Mits is
likely caused by bad power supply capacitors....they are made by Rubicon and are notorious "leakers"......very tedious and
expensive to fix...................good set back in the day.......T.