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Ur tv convergence are dead that why.The convergence board require the 2 STK convergence ICS and some or all it resistors must be change to solved convergence problems.The shop will cost u $300-350 for parts and labors.
Well repair of TV depends on your own skills and if you have any experience of electronics stuff repair then it would not be difficult. This kind of repair requires good parts soldering in PCB expertise.
Your Sony KP-51HW40 seems have problem with convergence out ICs (two ICs) that would be replaced. Both ICs STK392-560 are located on D Board and available in Part Store. Thanks.
This is your Picture tubes getting very weak.( low in emission ) You have three in there and I guarantee they are no longer available so I would start thinking about investing in a new set, but use that one until you can't stand it anymore.
I'm working on the same problem. I posted a little about this problem under another question for the 53XBR200. From what I've learned so far with experimenting and studying the schematics is that the problem is with the BR board which is the module that handles upconverting. PIP video goes through the BM board/module. You can pull the BR board out of the set and still have the TV work as long as you keep it in PIP modes. Likewise, you can pull the BR board out, but the set will turn off if you try to go into any PIP mode. The problem with static on every input only remains in full-screen video. As you've noted, all inputs work fine as long as you remain in one of the PIP modes. It does look like the BR board is discontinued. I would like to know how to get a replacement/repair if anyone knows about this. My only hope to get this set functional again is to either force the video to bypass the BR board, or repair the BR board itself. If it's a discrete component on the BR board (capacitor, resistor, transistor) then it might be possible to salvage a repair. If it's one of the upconverting chips, then we might be SOL. I've tried to jump the video signals around the BR board, but this didn't work and the picture looked distorted. I think the problem with this idea is that the video processor might be expecting 480p/960i video and by bypassing the upconverter I'm sending 480i video into the video processor. I'm going pursue this idea some more as it might be the only way to salvage the set from the trash bin.
Sounds like a bad solder connection. When you lose video, does the on screen display still work, and if so how about your picture in picture? If no OSD or PIP works then you may be loosing your High Voltage to the picture tubes. Some circuit board assemblies are no longer available from Sony for this model so you may be out of luck if the problem is more than a bad connection.
When you say you have tried all the inputs you are not clear if you mean tuner, vcr, dvd, aux, etc. If you are talking about only the cable input it sounds like you have a bad tuner. To obtain picture in picture there are 2 tuners in your set. This would explain why the small picture is ok while the main picture is bad. You should be able to swap the signals (see your ops manual). Try this. If the snow moves the one tuner is bad. If you have put other signals in (besides cable)such as dvd then the problem is in the matrix circuitry where the two signals merge. Either problem should be easy for a good tech to solve and not cost a whole lot.