First post, by matze79
- Rank
- l33t
Hi
have a little Problem with a Device like this: https://www.youtube.com/watch?v=7JS3K324Q5w
here a a Picture of my issue,
here are some more:
http://www.dosforum.de/viewtopic.php?f=1&t=9960
i have this little Bondwell B310 Laptop with 40Mb Harddisk and Harris 286 12Mhz CPU.
It had a defective Capacitor in the negative voltage for the LCD Contrast.
but after i replaced the capacitor, the new one got hot and died too.. (polarity right)
On + of C4 i read a Voltage of -12.5V.
Has someone encountered a similar Problem and knows what i have todo ?
looks like some sort of charge pump, which generates the negative voltage.
The trace runs to a coil and to the diodes
Thanks for all Help
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