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Topic |
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ConsoleCowboy
Starting Member
23 Posts |
 Posted - 22 Oct 2002 : 18:48:26
I have a variation of the checkerboard problem on a Classic II. Additionally to the usual checker pattern, there is also vertical line about 1/8" large with color contrasting with the background checkerboard (the vertical line is black when passing over a white square and vice-versa. There is also horizontal smudge also alternating with the background square. It is really hard to describe, but here is a photo (sorry for the bad quality it is a cap from a Hi8 camera) :http://www.photoaccess.com/share/gSlideShow.jsp?imgIndex=3&jrunsessionid=1035336510031281654&cb=PA&svr=web3&ID=AF78C5350E7 I noticed on the cap near the flyback transformer on the analog board seem a bit loose. It is also quite tilted ont side. Since the cap is cover with a rubber sleeve that dried and glue, it is hard to tell. Since I am a bit afraid of getting zapped I don't want to play too much with it. Here is a photo of the offending capacitor : http://www.photoaccess.com/share/gSlideShow.jsp?imgIndex=0&jrunsessionid=1035336510031281654&cb=PA&svr=web3&ID=AF78C5350E7 Thanks for your help, I'll take any tip that could help save that poor Classic ! :wq |
ConsoleCowboy
Starting Member
23 Posts |
Posted - 22 Oct 2002 : 18:50:30
I forgot to mention that I already tried to clean the SIMM contact and reseat the ROM chips. That is about all I did yet.:wq |
Mac_wt
Starting Member
Belgium
4 Posts |
Posted - 29 Oct 2002 : 09:31:56
I think a checkerboard display is usually caused by a dead battery. Did you check that?--------------------------
Classic, Performa 630, Duo 250, Quadra 610 (+ Performa 5300, Powerbook 1400, iMac 266, iMac 400, TiBook; but those don't count here) |
ConsoleCowboy
Starting Member
23 Posts |
Posted - 16 Nov 2002 : 09:02:40
quote:
I think a checkerboard display is usually caused by a dead battery. Did you check that?--------------------------
Classic, Performa 630, Duo 250, Quadra 610 (+ Performa 5300, Powerbook 1400, iMac 266, iMac 400, TiBook; but those don't count here)
Yes, I just tried with the working battery from my IIsi. Still don't work  :wq Edited by - ConsoleCowboy on 16 Nov 2002 09:02:59 |
ConsoleCowboy
Starting Member
23 Posts |
Posted - 16 Nov 2002 : 09:20:15
Does anybody have the schematic for the Classic II analog board ? I plan on ether resoldering or replacing the loose. I would also look at other potential problem on the analog board. Thanks !:wq |
Trash80toG-4
NIGHT STALKER
USA
2899 Posts |
Posted - 16 Nov 2002 : 12:18:46
Check the schemati links on gamba.jt  ™.
Trash Hauler: call sign: eight-ball
C.O. AC-130H SpecOps 68kMLAAF |
jag
Starting Member
22 Posts |
Posted - 14 Aug 2003 : 15:46:22
Again, this is *EXTREMELY* common, you either have badly seat ram or ram card or a component on the mb has gone south. I've seen it HUNDREDS of times over the years.jag http://www.jagshouse.com-classic Mac site Mac goodies for sale. 128, 512, Plus, SE, SE30, Classic, CII, CC, II, IIX, IICX, IICI, IISI, IIVX, IIFX, MacTV, 575, 660AV, 840AV, Q700, Q900, Q950, 6100 - 6500, 7100 - 7600, 8500, 8600, 9500, 9600, iMac G4 |
tomlee59
Starting Member
USA
46 Posts |
Posted - 14 Aug 2003 : 16:59:22
Again, an analog board problem isn't going to cause a nice, regular (digital) checkerboard display. You may indeed have an analog problem, too, but fix the checkerboard problem first. It's on the logic board.
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jag
Starting Member
22 Posts |
Posted - 27 Aug 2003 : 19:12:09
Yes it is, I've seen it as noted in my previous posts: )http://www.jagshouse.com-classic Mac site Mac goodies for sale. 128, 512, Plus, SE, SE30, Classic, CII, CC, II, IIX, IICX, IICI, IISI, IIVX, IIFX, MacTV, 575, 660AV, 840AV, Q700, Q900, Q950, 6100 - 6500, 7100 - 7600, 8500, 8600, 9500, 9600, iMac G4 |
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Weird checkerboard boot screen on a Classic II
68k of the Week: kastegir's PowerBook 180.