Where would they be on the signal board. The Signal board is the one where everything plugs into right? Also were would I get the right coupler replacements?
I also was thinking about replacing the STK392-110 IC'S and the 6.8 ohm 1 watt flameproof resistors on the Convergence board because of the halo efect issue. Do you think this is a good idea or will fix the green halo effect?
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Re: Yes i need more help on these opto-couplers
The halo effect is due to the green and blue CRT coolant being congealed this is a common problem. Red will not have the same condition. As for the opto-couplers they are located on the large signal board in the middle of the board all lined up in a row they will have board location numbers of 7412, 7406 and 7413 . 7412 is usually the culprit the part numbers for 7412 is 9322-105-14682 7406 and 7413 are the same part number 9338-894-15682
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Thats caused by the small signal board located on the right side of the set ( Green board with the RCA plug inputs on it. Very common issue with that chassis. The board will have a barcode sticker with an as222 number. You can get replacement boards and any part needed for that model from www.tvrepairworld.com
Check the small signal boards solder connections. The small signal board is the large green circuit board on the right when looking in the rear ( Has all the inputs on it ) Famous for solder issues on the
ITC222 small signal boards.
check the thin ribbon cables that go from the deflection board to the small signal board they are both right next to each other if those arent seated properly the small signal board will not get any supply voltages from the deflection board
The hypeboard has failed. There are about 12 capacitors (surface mount) that need to be replaced. Unless you have very good soldering skills you shouldn't attempt the repair. The hyperboard will be marked with MVPU14 I believe. It should be located directly behind all your input connections in enclosed in a metal can. It is about 8" inch square module that plugs into the signal board.
The metal housing will need to be unsoldered from the signal board, before you can remove and service the hyperl board.
The Color Signal on this Model Series travels across three boards before being sent to the CRTs. The 3DYC Board, Signal Board and the Terminal Board. Most likely, the 3DYC Board or the Signal Board is causing the problem. I have had intermittent solder connections on the 3DYC Board to cause no color problems. This Board plugs in and is located on the left front of the Signal Board as you look from the rear of the chassis. If you feel you are not up to the task to work on the set, call a Mitsubishi professional. To find one, call Mitsubishi at 1800-332-2119.
I hope this helps,
KP-43HT20 has 2 tuners, one is main (TU2) and 2nd is called sub tuner (TU1). Both tuners are mounted on A board located on right side of TV.
In my opinion, main tuner (TU2) is not working and causing No Signal message.
Let me know if you want to repair tv by yourself.to provide you more technical info.
What I've found is that not all models have a PIP module that is removable. Some of the models have a PIP IC (IC6P01). It's built into the signal board. You can't see it unless you remove the shield cover. There is also a plate cover on the underside of the signal board. It's soldered on. This information will help identify your particular model.
I also have a built in PIP circuit. I repaired my set by replacing the following electrolytic capacitors. (C2P02 47mf 35v), (C2P03 100mf 16v), (C2P04 47mf 50v) (C2P05 100mf 16v) and (C2P08 100mf 16v). These capacitors are located on the right side of the signal board, where the signal board connects to the main board. They are located next to heat sinked voltage regulators, one of them being IC2P01 (9v IC regulator). I'm not sure which capacitor was the actual culprit, however it's been said that C2P05 fails a lot in these sets. Anyway, good luck with the repair.