(Topic ID: 227569)

How to set your Data East 128x16 display on fire

By Crispin

5 years ago


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  • 15 posts
  • 3 Pinsiders participating
  • Latest reply 5 years ago by Crispin
  • Topic is favorited by 1 Pinsider

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#2 5 years ago

Next time, please use 33k resistors, 33000 Ohms. Or bring the display to someone who knows what he is doing….

#4 5 years ago

You are welcome. This can be an expensive screw up....

Did the HV section on your power supply survive?

Hopefully only the Q1-Q4 transistors and the surrounding resistors died and not the glass or the HV drivers (PLCC44 IC's)…..

#7 5 years ago

I am referring to the display board.

Is the powersupply still delivering 12V, 68V, -100 and -110V?

#11 5 years ago

Don't bother to replace D5 because that one is ok. 71V is an ok reading. Your other readings are probably -151V and -139V (minus). Notice the 12V difference between these voltages which is ok. The 110V zenerdiode went to heaven and probably also the MJE transistor behind it. When you choose to use the LED display it is ok to just remove the fuse.

#14 5 years ago

If Pbpins didn't tell you already: be aware the MJE350 has a ECB pin-out and the MJ15031 has BCE; you will need to turn the MJ15031 180 degrees.

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