(Topic ID: 266331)

T2 has strange? electrical issue on row

By tezting

4 years ago


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  • 14 posts
  • 6 Pinsiders participating
  • Latest reply 4 years ago by Brtlkat
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#4 4 years ago

Test diodes or could be the transistor that the drives that lamp row. Hard to read from your pic but looks like Q89

#6 4 years ago
Quoted from tezting:

Thank you.
I forgot to mention that it also happens during attractmode. Could it still be the switches in this case? I will change the diode.

No doesn’t sound like it has anything to do with switches. You can test the diodes with a dmm. Sounds like a driver transistor in the lamp matrix as said above.

#8 4 years ago
Quoted from pinmike:

Transistors are for coils and flashers,The reason I said to check switches is because when you activate a switch that lamp associated with that switch should light up and not light up multiple lamps

When a transistor or diode goes bad, generally it shorts on. When a transistor shorts on in the lamp matrix, it will make all the lamps in that row or column appear permanently on, and be very bright.

#12 4 years ago
Quoted from Schwaggs:

Remove the LEDs from the eyes and try incandescent bulbs - see if the problem persists.
Is it possible one of LED lamps in the eyes was installed backwards?
Look for other lamps in that row installed backwards (easy to do with 555 sockets).

How do you install 555 leds backward

#14 4 years ago
Quoted from tezting:

I just finished a complete restoration. So it has been taken completely apart 5 years ago!
Everything is cleaned etc. but before I did that the same LED's where installed and it worked just fine.
When I fired it up for the first time a couple of days ago there where only two problems. This is the last one I need to solve
I really_ appreciate all the people trying to help me with suggestions/debugging.
Here is a video of the second target light that is part of the row "acting up". As you can see its not on all the time or brighter than the others. It just behaves wrong. The other light in the row is also acting "strange". Not on all the time but strange behavior.

Did you test the diode associated to that bulb, as said above a few times.

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