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devices: Any Projection TV with a Convergence Amp board
If I knew which Mitsubishi Projection TV you're looking at, I could help quite a bit more. In general, the "convergence chips" on a typical Convergence Amplifier board are actually two STK's mounted to large heat sinks. "STK" is electrical engineering slang for "Convergence Amplifier Integrated Circuit".
Verify the model number. Some of these Mits. family have bad picture tubes, and oil spills out onto the signal board. Look inside front panel, RHS tube, look below it onto signal board. If you see an oil puddle, then tv is toast!
You have either bad convergence ICs or just bad grounds on the IC. I would go ahead and replace the ICs and check those small ohm resistors, as you have to pull the signal board out anyway. For futher instructions see the website www.TvRepairKits.com. They may have what you are looking for. Be sure you have the TV model number next to you. Thanks for asking and show a few hands of support!
not sure which part you need main board (where flyback lives) is part no. 930b903002, power board ( where convergence IC's live) is part number 930b904001, signal board ( where tuner lives) is part no. 930b905001-55. I checked with encompass.com they have all three in stock.
THERE is no convergence ICs on these sets it does have convergence board it has serveral ALuminnin heat sinks on it If comcast was at fault it would have fried your SSB board which will shut TV down Cost of Board is 352.00
You need to replace the surface mounted voltage regulator IC (small black square chip with a metal tab on one end, and two legs on the other end.) it is on the main board, right behind the signal input board. It's a BA09FP regulator IC, you can purchase this on mouser.com
it requires a bit of disassembly, but it is relatively easy to do. it is component number IC9C25. It could be bad, or just have bad connections . This IC supplies 9 volts to the terminal board. Try resolding it first.
also check resistor values on the chips and resolder the tuner as this can cause problems as they heat up , then replace any electrolitic capacitors in the video circuts selector ic
i will be back to see what you get
Sorry, but when the coolant leaks down onto the small signal board, that board will never work right again. The fluid penetrates the board itself since the board is double sided and has many feed-throughs. The fluid gets under the surface mount parts and just eats through the copper traces, part leads and board itself. After trying many times to clean and restore those boards, not one has ever worked right again. The boards are NLA from Mitsubishi, so the set is done.