I'd remove the socketed chips, clean contacts and reseat first

I've had a "Mystic" VGA-modded Colour Classic with LC575 board which has been running fine for a decade, and it's one of my most used 68K Macs.  I was also given a "Takky" VGA-modd…

You can find 10" "flatscreen" monitors out there, but you'll have two problems to overcome. The flat screen won't fit the very curvy bezel that housed the very not-flatscreen Sony …

Well it increases the current tails in the horizontal output circuitry so it swings the beam harder.  But the problem with this, it adds stress to the sweep circuitry so eventuall…

I thought about this. Can you tell me which one is it? Just so you know, I also replaced the VGC chip and it made no difference. Thanks!! Pitou

My guess would be something with the character ROM?

Hello, I have an issue with an Apple IIgs. The text is kind of doubled in Text mode. When I boot a system disk, in graphic mode, everything is fine. I have some experience in elec…

I have read that the flyback transformer in the Color Classic was slightly undersized to began with.  And then, because of venting issues, it became slightly hotter then it would l…

I don't own a CC and haven't done this modification, but I've looked at the horizontal sweep circuits of the B&W compacts in some detail. I think the CRT shouldn't be your…

Hi... My TV is the very last CRT HD Sony TV.  Deep, deep blacks, and pure whites.  Yes, it is only HDMI 1.1, but I love the 1920 X 1080p picture. No motion artifacts. I am gettin…

Yea, I know... I fubared that one up pretty good. But, oh well... 

OK, I love the attempt at being a wiseguy, but TK, you typed THE ENTIRE URL into the google search box.  LMFAO

http://lmgtfy.com/?q=http%3A%2F%2Fwww.micromac.com%2Finstructions%2FCC_Video_upgrade%2Findex.html

Hi... I would like to pull the analog board in my Color Classic.  Any one know of a web site (that is not dead) that has good photos of this?  I have the Mac Service manual, but t…

You try another known good working drive? I would hope so.  Otherwise, did you check the DMA lines that bounce between the SCSI IC, GLU, and VIA? 

I checked all traces going to/coming from the SCSI IC, they are fine.

Time to check traces between the SCSI IC and the SCSI header. They break at the IC. 

The voltages above were the ones coming from the pwr supply. With the RAM they are -5V (6), -11.77V (7), +5.04V (12,13), +12.71V (14) Molex are 12.33V and 5.05V RAM was maybe ju…

so -12 is too low and +12 is two high,  and what are they without the ram?

ATX connector measured voltages are -4.98V (6), -10.47V (7), +5.28V (12,13), +12.62V (14) Molex disk connector voltages are 12.71V and 5.08V

With symptoms like that how is voltage?

This one is a little bigger and you kinda have to squeeze it in the holding area but you can get it in there... at least with this you can replace the battery's when need be... Thi…

Not a bad idea. I'm still using the original pack on mine but I'm sure it will die one day.

Ok so I found a great solution to replace the battery..... Purchase these http://www.ebay.com/itm/180979418921?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT …

Awesome man , Did you get MLCC's on there or stock Panasonic electrolytics? I forgot. I'm sure blob would be happy! I think he just turned 71