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Old 15th July 2012, 11:27 PM   #11
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That would seem to indicate that the problem is with transistors Q124-Q127 or the resistors connected to those transistors. It could also indicate that the board itself is conducting.
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Old 18th July 2012, 12:40 AM   #12
timwebb is offline timwebb  United States
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where are these two? im over looking them.
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Old 18th July 2012, 12:47 AM   #13
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They are on the driver board. Q124 and Q125 are the MPSA42s that commonly fail.
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Old 21st July 2012, 09:32 PM   #14
timwebb is offline timwebb  United States
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the MPSA42s on this card are in q35 q36 q40 q41. ive replaced them all due to the legs were discolored from heat. can a resistor be defective if it still read correct?
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Old 21st July 2012, 11:58 PM   #15
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Generally, there are only 2 transistors between the MPSA42s. Are you sure that you have the transistors in the correct locations?

If you shine a bright light from the back of the board, are there any areas between the solder pads that won't pass light?
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Old 22nd July 2012, 06:33 PM   #16
timwebb is offline timwebb  United States
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i changed the two resistors between the MPSA42 transistors and it works now.
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