Arcade Collecting > Pinball
New pin: Lethal Weapon 3 (Update: FIXED)
shardian:
--- Quote from: pinballjim on December 17, 2009, 10:47:49 am ---When measuring DMD voltages, you need to take them off the actual pins on the DMD when the display is plugged in.
--- End quote ---
Is this because the circuitry requires a load to run? This is never even hinted at in the pinrepair guide.
shardian:
--- Quote from: pinballjim on December 17, 2009, 12:01:20 pm ---This is because you need to verify what is actually making it from the power supply to the DMD. No idea what the circuit does without a load, but that's why you're going to measure at the DMD, and if the voltages are incorrect, measure it at the power supply. It's a good habit to get into.
--- End quote ---
I see what you are saying now. You're basically testing the pins at the same time of testing the voltages.
ChadTower:
He's breaking the circuits down into smaller circuits in order to isolate where the problem lies. Start at the source, determine good voltages. Move on to the next possible test point, ensure still good. Keep moving forward until it is bad, then you know the problem lies between those two points. Or, start where it's bad, and keep moving backwards until it is good.
shardian:
Well...I already know the voltages are bad BEFORE the DMD. I measured at the DMD end of the connector!
ChadTower:
I wouldn't be surprised if he's right about needing the DMD present and under power to get proper test readings.
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