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Your Hitachi Tv has some loose sodering problem I thins. To ensure that, you just put a gentle hit with your palm, on the top or side of the cabin of your tv, when it shuts down. Never hit with any hard materials. Only your palm shoud be used. If it comes alive, or tries to come alive, surely there may some loose soldering points inside the printed circuit board of your tv. If it doesn't the fault may be in the horizontal output section of your tv, and must have some sort of skill, knowledge about the schematic diagram of your Tv, and a lot of patience. If you have these, just open it and find whether the horizontal output transistor [usually can be located very near to the Line Output Transformer [LOT], gets overheated, after some minutes after switch on. Never touch it when the TV is live, ie with power applied to it. Turn off and unplug it from wall socket before you do this. If it overheats [there may be some heat has but the temperature should be bearable for us with fingers]; tgere may be some fault either to that transistor or the LOT. Replace the transistor with same type and number first. If the transistor replaced also gets overheated, LOT is faulty. Replace it with the same type and number. Insist on same type and number, when replacing LOT; because it is the critical part in your TV. ok.
Try unplugging and waiting about 2 min. Then retry. There is a self protection circuit which is what is stopping the unit from coming on, but it can be triggered by many things. [Units this old are famous for the capacitors (electrolyte dries out and then they blow), but that is just the most common problem. I would look the capacitors over and see if they give any indication of being "blown" (discoloring, etc.) and replace them if they do.
they should have the manual you are needing, they only have a fraction of the manuals listed that they have based on popularity. If you go to the site and click on the contacy button and indicate the model number of your set they will let you know within minutes if they have the manual, and if they do they will instantly list it for you on their site.
1. A Cold solder in the Video Output stage power supply.
2. A bad Electrolytic Capacitor in the above Video Output stage.
I generally do not waste time in attempting to locate faulty capacitors. There will be only 6-8 pf them in the above stage / section,m and the klot of them would collectivelyt not cost more than 3-4 $ equivalent, in india. Just blindly replace the lot, and the set is ready in 30 mins.
Dunno how much they will cost in your country. Try to look for a 100mfd, 160V Capacitor. Close your eyes and replace. generally does the trick.