Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old September 29th 05, 08:21 PM
Dave D
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"Asimov" wrote in message

There may be issues with tube biasing. Perhaps some off value
resistors or supply voltage. Turning down g2 might do it in a pinch.

He's talking about TFT monitors ;-)


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Old September 29th 05, 09:06 PM
Alex Bird
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QJD1 wrote:

My options to repair my monitor are now
(in that particular order):

0. Acquiring schematics and other relevant information
1. Checking circuitry for defects or faulty components
2. Adding variable resistor (pot) in the dimming circuit
3. Applying black Sharpie magic marker (or similar) to the tubes
4. Mounting anti-glare screen in front of a monitor.

I don't know if it counts as a repair, more a mod really!

If it has double tubes top and bottom, you could halve the brightness
by simply disconnecting one of each. Cut the connector with a sharp
blade to connect one only. When that tube dies, you can just swap to
the reserve!

This photo shows a connector cut (to fit a different socket)
White wire is common.

You'd need a fairly serious pot to vary that supply, probably a
regulator controlled by a pot. You could also connect a PWM signal to
the enable/inhibit input on the inverter board for a potentially more
reliable result!

Good luck,

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