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Old 18-Apr-2019, 8:39 PM   #2
Retired A/V Tech
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,719
Originally Posted by dustyz View Post
I have a few pre-amps that have "died" over the years. Both still show voltage from the injectors, but neither show any boost in signal.

Is there a basic troubleshooting guide for the electronics in these things?
There is no basic troubleshooting guide for the electronics in preamps.
Even if you found a bad part, could you remove and replace a tiny surface mount component?

There are external tests you can make like measuring the current to the preamp, measuring the voltage at the preamp when it is connected, and measuring its gain. If it fails those tests, replace the preamp.
If you can not measure it, you can not improve it.
Lord Kelvin, 1883
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