Re: WG6100 monitor lv2000 problem

On Sat, 02 Feb 2002 22:53:48 -0800, you wrote:

> I checked the resistor values again and they are fine.
>Must be the values are different right after power is disconnected.
>After it sat a while they were fine. But still I have the voltages
>coming up too high on the LV2000. I cant figure that out. Still no
>picture, but have deflection hum and HV.

        Ummm - well, for one thing, you CANNOT reliably check resistor values
in-circuit, and you _doubly_ cannot check them while the unit is
operating!!

        A standard ohmmeter works by applying a small, tightly-regulated
"sense" voltage across the probes and detecting the current flow through
the resistance under test. Attempting to check a resistor in-circuit will
fail, because all of the other components surrounding it will _also_ get
that voltage applied to them, through their connections to the resistor
under test, and add their series and parallel resistances to the reading.
Checking a resistor in-circuit while the unit is operating is doomed to
fail not just because of the above, but because the resistor now has
_other_ voltages being applied to it, via the circuit itself, which will
swamp out the test signal being applied by the ohmmeter and fool the meter
circuitry into a false reading.

        IOW - if you think you may have a bad resistor on your LV2000 (or
anywhere), to _really_ check it properly you'll have to unsolder one lead
and lift it out far enough that it can't make contact with the board, and
_then_ test it.
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solarfox@DON'TMESSWITHtexas.net (Gary Akins jr.)
http://solarfox.home.texas.net/
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Received on Sun Feb 3 06:13:01 2002