Re: WG6100 monitor lv2000 problem

 I didnt check them while it was operating, im not stupid, and they
check out fine now as I mentioned. I checked them right after the power
was disconnected, must have still had some curent built up in it. After
it sat a while the resistor values were fine. They also check out fine
in circuit. I have checked out many in circuit and have had no problem.
    The resistors are not the question anymore. I cant get the voltage
down to +/- 26 vdc. It wont go that low. The lowest I can get is +/- 40
vdc. That value will increase the longer it has current running through
it. Could something besides the LV2000 be causing this or is it the
LV2000 itself possibly. Could the high voltage going through the LV2000
cause there to be not picture? Anyone? Anyone?.
Dan

solarfox@texas.net wrote:

>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.
>-----------------------------------------------------------------------------
>"So I ask again: What was it you hoped to teach us? It occurs to me that
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>know what you just started.
>
>But you're about to learn."
> --(Leonard Pitts jr., newspaper columnist, Sept. 12th, 2001)
>----------------------------------------------------------------------------
>solarfox@DON'TMESSWITHtexas.net (Gary Akins jr.)
>http://solarfox.home.texas.net/
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Received on Sun Feb 3 09:00:06 2002