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D444 LCD inverted driver

I've got a Xerox XA19I Model 900P monitor with a faulty inverter output FET? It is a D444 BE5D4R, is this a FET or something more complex? It is short circuit and can't find any data on it. Anybody got data on a substitute? The makers logo on it is an A with an elipse (squashed circle) going through it. Anyone know of this manufacturer?
Any help would be realy appreciated.

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Re: D444 LCD inverted driver

Have you called short circuit and ask them? Call Redio Shack, they maybe able to help you.

Posted on Nov 27, 2007

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I have got to the bottom of this ,after I got one of scopes out (PM 97) the output of the TL 494 IC was disappearing .The IC seems to crash easily ,I think the oscillator on pins 5&6 actually stops.
I cleaned the whole board with an aerosol of PCB cleaner and heated up the PCB up with a small craft heat gun to quite hot .
I fitted a 0.01 mfd capacitor across the IC pins 12 to 7 to decouple the VSS supply ,because I felt the cause of the IC stopping could be interference based
The monitor now runs for all day with no sign of the backlights cutting out.
I found out this LCD display was made by proview.

Barry Wilkins
john r uk.

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1 Answer

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