Star Trek: The Next Generation
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Quoted from ozdinak:Does this mean the LM339 has gone bad? If so, which LM339 is the culprit? There are two (U4, U6) on the Fliptronics board.
Yes, most likely U4 LM339 is bad.
You can check U4 pin14. If that pin stays low (~0Volt), it is probably bad.
If you decide to remove U4, you can start with only to clip pin 14 and see if "stuck closed" disapeared.
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