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There is little to go on in what you provided. If the boards are the same part number in the service manual they should work. Do not assume the markings on the boards are complete. The most common problems in these sets with the signal board are due to coolant leaks, but there are many possibilities, including a misdiagnosis to start with.
 

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Any shop that could not repair the board because of "intricacy of the microchip solder attachments" is being lazy or does not know what they are doing. These chips are tedious but not terrribly hard to change. The bigger problem is usually availability. Are you saying that they could not pull diagnostics using the INPUT and MENU button combination?
 

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I don't think that there are any chips with more than 84 pins on this particular board. Yes, most can be replaced, easily if you have the right equipment, and with care many can without special equipment if you have the skills.

Many shops will beg off on a repair if they don't get to an obvious problem quickly, then give you some answer that sounds like it might make sense but is really just a lot of nonsense excuses for not getting deeper into it. Now it may be cosly to repair a complex problem, but they should just say that.

Without more detail and troubleshooting, there is little that can be said about your problem. The first thing that I would do is put it back together and try to pull the diagnostics. MENU + INPUT on the front panel held simultaneously for 5 seconds should result in a 2-digit blink code. If you don't get that, then you have to start with the power supply and micro.
 

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Sounds like you have an intermittent problem and perhaps a convergence failure. I would read the first 10 posts of the convergence repair sticky in the DIY repair forum carefully.
 

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Please start a new thread for YOUR problem.

Read the first ten posts of the convergence repair sticky very carefully:
http://www.hometheatershack.com/for.../5600-crt-based-rptv-convergence-repairs.html


It is always a good idea to call around to the shops in your area to get an idea of who is really familiar with these sets and what they might charge. If you do not feel confident in your ability to do the repair you might have some good options.
 

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Look again for coolant damage to the connectors between the boards or on one of the other boards.
 
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