Posted By
MikeZ
on 2009-06-04
10:31:47
 |  Re: Why is the TED chip so vulnerable to frying?
I bought 4 plus4s in 1985 thinking I had a lifetime supply of spare parts. Three of them lost the TED chip after 2-3 years. A TED chip alive today is almost 25 years old and way past the initial burn out at the beginning of its life. The cooling ideas are all good. But, you have to ask yourself what else is causing the overheat. After all, that TED chip has been well behaved for many years with no problems, unless in storage all this time.
It's time to get out the schematic and look for bad capacitors and resistors. These other things go bad as well. I recently repaired a plus4 where one of the inverter/buffers for the serial bus was fried.
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