Mark_W's latest activity
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MMark_W replied to the thread Macintosh LCII failure.No, only LC III and LC 520/550 has onboard vram. There's no activity on scsi bus at all? You can also try to insert a floppy disk, see...
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MMark_W replied to the thread Macintosh LCII failure.Is VRAM installed? LC II has no onboard VRAM and if no VRAM is installed, it will boot to a blank screen. Also try a different VRAM...
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MMark_W replied to the thread Colour Classic Display Issues After 84v Mod + Recap.So like I said primary side should be ok, if you see around 10v across pin 4 and 6 on TDA4605 then it should try to start, and you...
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MMark_W replied to the thread Colour Classic Display Issues After 84v Mod + Recap.Did you short BD11 when taking these measurements? If so and voltage across pin 4/6 is still 0 then you found the problem. Soft power...
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MMark_W replied to the thread Colour Classic Display Issues After 84v Mod + Recap.Yes basically what @jonschultz said, you are measuring the voltage regards to cold ground which is floating, you need to measure voltage...
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MMark_W replied to the thread Colour Classic Display Issues After 84v Mod + Recap.53.8v is way too high, should be around 10-20v IIRC. Also ip7 is on primary side so you need to measure the voltage of it regards to hot...
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MMark_W replied to the thread Colour Classic Display Issues After 84v Mod + Recap.Power supply for CRT part and logic board are mostly independent, and from your readings the CRT part should be working fine. 5V...
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MMark_W replied to the thread Mac Classic Help! Checkerboard & Wavy!.So both analog board and logic board have issues. I'd figure out the problem with analog board first, wavy pattern is usually a...
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MMark_W replied to the thread Colour Classic Display Issues After 84v Mod + Recap.DL21/22 voltage is ok, but DF2 voltage is much higher than it should be (8.2V). Did you install the correct zener diode? Also double...
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MMark_W replied to the thread Running the Macintosh II High Resolution Video Card at 512x384?.Does the High-res card actually support 512x384? On this site 512x384 is listed as not supported...
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MMark_W replied to the thread Is it an SE or an SE/30?.If the front bezel says "Macintosh SE" and it's on the lower right corner then it's really an SE. If the "Macintosh SE" text is on the...
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MMark_W replied to the thread Colour Classic Display Issues After 84v Mod + Recap.The screen geometry and color are both way off which is a good hint that something's wrong with secondary voltage outputs from CRT...
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