In process of VGA mod on CC

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Joined: Jul 13 2007
Posts: 2

I am in the process of doing the VGA mod on my CC. I have an LC 575 motherboard that I want to use as well.

First I isolated pin 8 with a dremmel type tool. Then I soldered a wire from pin 8 to pin 12.

I then Isolated pin 20 on the analog board by dremmeling the pin in this manner:

pin
22 20 18
21 | 19
connector
^
| I cut right there, figuring it would be isolated

I then dremmeled pin 25 at the bottom (towards the connector) to isolate that (or so I assumed). I then soldered pin 20 to (d'oh) pin 26. I got video, but it was really messed up, and the OS 7.6 boot CD gave me a bomb (bus error) with the LC 575 motherboard. Noticing I didn't solder pin 20 to pin 24 I dove in again to fix that.

I then soldered pin 20 to pin 24 with some wire and put everything back together. I now have NO video...

Here's what I thought might have caused it:
1) pin 25 is not isolated because I only isolated it on the bottom, not the bottom and top as pictured here:

http://www.colourclassicfaq.com/img/connector.jpg

2) I messed up the solder joints surrounding pin 26 through pin 18 as I did get solder very hot around there. I didn't have the right tip on the first time. I DID find my fine tip though...

3) I broke the CRT in some manner...

I've checked to make sure I plugged everything in. I just don't know where else to check, or how to check if I've killed my color classic.

Any tips or advice is appreciated!

Thanks,
John

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Offline
Joined: Jul 13 2007
Posts: 2
looks like my text diagram di

looks like my text diagram didn't work right. I will post pics tonight, but I isolated pin 20 by dremmeling straight down to the connector if that makes sense.

I should also note my board does NOT have J78/79 on it.