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Dell Optiplex SX260 Computer Won't Boot Up
Here is an update:
Using a "lo-pwr ohms" (low voltage) B&K meter, I measured about 5.5 ohms across the bank of 2200/6.3 caps numbers C146, C147, C148, etc. Note: This reading is not caused by charging. I switched to "hi-pwr ohms" and the reading dropped to 4.4 ohms. Note: 412mV measured (via a DMM) across B&K meter probes during "hi-pwr" ohms reading. It is possible that one or more of these caps is the cause of this low ohms reading (not normal). There are about 9 or 10 caps in parallel. MORE UPDATE: I failed to mention that there is no sound (beeps, etc.) when I turn on the power. Also, I removed the CPU to do some of the tests. Using an external variable power supply (with current meter) connected across this bank of 2200UF 6.3V caps in parallel (with proper polarity), at 2 volts, less than 250ma. It looks as though this problem has nothing to do with a "shorted" cap/s. Again, Thanks in advance, John |
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