HGC _could_ stand for Hercules Graphics Controller. I don't know.
The display... are you sure you haven't shorted anything with solder?
Have you tried using a VOM in O mode to directly stimulate the display?
Touching it to various pins should get various lines to appear.
>'fixing' my portable '286 box with LCD display (which I think is
_barely_
>classic).
>
>The cable leading to the display had had three of its wires pulled out,
>and I figured that this was the reason for the very weak and grungy
>display.
>
>I managed to solder little bits of wire into the holes and solder the
>stray wires from the cable onto those, but then I realized that I
couldn't
>plug the thing in anymore as the holes (from the underside) had filled
>with solder. :/
>
>And I also realized that my solution was a bad one because the
protruding
>wires would short against the metal frame that holds the LCD panel in
>place.
>
>So I used the connector from the C64 keyboard instead.
>
>Anyway, I got the cable rebuilt. I've tested it with the multimeter
and
>all the wires make contact and go to the right places.
>
>But now I can't get any kind of display from the LCD panel. It doesn't
>light up at all. It looks like it's totally dead.
>
>I put a monochrome display adapter card in the machine, and it will
boot
>up with that and display fine on a monochrome monitor. So the machine
is
>_mostly_ OK.
>
>I'm not sure the power supply is OK, though. It squeals now.
>
>So basically, I've turned an ill-looking display into a dead display,
and
>for some reason a healthy power supply is now sounding sick.
>
>Bleah!
>
>Anyway, the machine has a special card in it for driving the LCD panel.
>It is labeled "LCD & HGC CARD". What is "HGC"? It has an external
9-pin
>port on it and I tried plugging the monochrome display into it, but the
>picture was all distorted so I figured it was using a different
frequency
>or something. The cursor comes out about an inch wide, and none of the
>craracters are recognizable, possibly just from overwritten numerous
times
>in the same scanline.
>
>I don't know where I'll go from here. I'm just taking a breather
>before continuing. I wanted to be rebuilding the TS1016 RAM pack by
now
>instead of still messing with this damn PC. <s>
>
>Oh, and BTW, I electrocuted myself last night when I touched some
exposed
>wiring going to the LCD panel. It surprised me that there was that
much
>juice going through there. My thumb and forefinger are still tender.
But
>the display was still working at that point, and looking much sharper
than
>it had been. But the machine wouldn't close up properly because the
>connector was too thick and that's why I went back in today, just to
>reverse the cable so that the big fat Commodore connector was on the
>inside instead of on the LCD panel end. (Which meant pulling the
connector
>apart and rebuilding it the other way, just so it would fit in.)
>
>I haven't crossed any wires, I haven't plugged anything in backwards,
and
>I haven't dropped anything into the machine, so I don't know what I've
>done wrong.
>
><s>
>
>
>Doug Spence
>ds_spenc_at_alcor.concordia.ca
>http://alcor.concordia.ca/~ds_spenc/
>
>
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Received on Wed Sep 02 1998 - 14:09:37 BST