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In general, you can't check a resistor in-circuit. Also, digital meters do very funny things when measuring resistances in-circuit. However you can verify if the reisitor is "definitely OPEN", or "MAY BE OK" with an old analog meter. You just can't measure "DEFINITELY OK". If you measure it at value or less than value, it "may be OK". If it measures higher than value, it probably is open or increased in value.
The other caution is that you may accidentally blow the meter by measuring a resistor which may be open, so your meter will get the charge from a capacitor somewhere upstream because the open resistor couldn't bleed that charge down. Always put a clip lead across any resistor for a second to short out any charge before you go try to test it in-circuit. That should protect you from a meter blowing Digital meters will still sometimes read funny because of harmonics in the circuit.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
Last edited by kx250rider; 11-03-2007 at 11:58 AM.
Reason: typo error
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