Question about Panasonic Toughbook CF-51 Notebook

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Panasonic CF-51 backlight intermittent

Voltage to backlight falls when backlight fails. All voltages measured at motherboard connector to backlight power supply read the same (referenced to ground) whether light is on or off. Simulating a lid closure (with magnet by reed switch) and then simulating reopening (remove magnet from reed switch) causes backlight to come back on (each time) for about 10-30 seconds before failure. Reed switch has been isolated and known good.

Question: Is there other circuitry on the motherboard that may cause this problem (even with the voltages measuring the same at the motherboard connector) or is the problem in the backlight power supply located in the monitor frame?

Thanks,

k

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  • R Shendo May 09, 2009

    screen barely visible when powered on. closed and opening laptop provides normal lcd brightness for a very limited time. overheating?

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