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Originally Posted by YamahaFreak
So, I have two issues with testing the buffer chips. A) My meter doesn't have a 'beeper' function, and B) many of the traces on the buffer boards are covered by glue, which I don't want to disturb unless necessary. (See photo) If it matters, while the set is powered up, all ten of the buffer chips' heat sinks get at least measurably warm to the touch.
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You can just use the ohms function but you have to watch the meter for a low resistance instead of just listening for a beep.
I would probably just test the ones that are exposed, it's at least not worth removing the protective coating. If you really want to completely test them you may be able to disconnect the flex cables and get into the socket connectors that way but I don't know that I'd recommend that, the cables can be very fragile and you certainly don't want to destroy an otherwise good panel by messing up a cable!
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EDIT: I don't see any connections between the YSUS and Y-buffer boards, other than two small cables. Could the large metal plates I'm seeing between the boards actually be the connectors/conductors? 
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Yes, it looks like on that model the top and bottom metal bars are ground and the middle one is the Yout signal. There shouldn't be any continuity between ground or Yout to any of those lines to the panel. Personally, I think I would just test what is exposed for obvious shorts.
If you do repair the Y-Sustain board yourself just be sure to order the correct IPM by the part number on it or it's equivalent. There are different versions by different manufacturers (like an LG number and an STK number) which are functionally the same and interchangable but the two on the board are probably different from each other so make sure you get the correct one if you're not changing both (or make sure you put the right one in the right place if you do change both) as there are some modules that have the same pin locations and functions but are lower power and may work for a short time in the high power position but then blow up.
You certainly don't want to have that happen after all your hard work!
