(Topic ID: 240495)

TAF backbox GI one string not lighting up

By harryhoudini

4 years ago



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#1 4 years ago

The orange/orange-white string (I think it's J121 pin 2 and 9 or something like that) isn't lighting up. Measuring voltage the yellow/white-yellow string has around 7-8v I think and the orange has like 1.5v. The fuse (F114 I think) is ok. What would cause low voltage? I can't see why the yellow string would have full voltage and the orange would not. Could it be the triac or transistor (I think those are the two other things on the circuit)?

#2 4 years ago

You measuring AC ? Hot to common, not to ground.

Quoted from harryhoudini:

What would cause low voltage?

Bad solder joints on board. Burned connector at board or trancformer.

LTG : )

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#3 4 years ago

Thanks, it was the obvious J115 not seated or starting to go out. It took a few tries but it's seated and working now so probably need to replace it.

#4 4 years ago
Quoted from LTG:

You measuring AC ? Hot to common, not to ground.

Bad solder joints on board. Burned connector at board or trancformer.
LTG : )

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