20 July 2015, 23:15 | #1 |
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Amiga 500 REV 5 Don't Boot Screen White and Grey
Hi,my Amiga 500 motherboard REV 5 don't boot the screen goes white, grey, white, but the startup screen doesn't appear,Try removing all socketed ic's and pushing them back in,swapped all sockted chip from another working A500 with the same negative result.
The chip swpped is: CIA PAULA DENISE CPU KICKSTART Is there anyone who can help me? |
20 July 2015, 23:41 | #2 |
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Hi Danko!
Try cleaning all sockets. I had the same problem with REV 6 and CIA socket. |
20 July 2015, 23:43 | #3 |
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21 July 2015, 11:40 | #4 |
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does it boot a floppy when you insert it when the whitescreen remains?
Does the empty drive click? Does it react to a reset over keyboard? Can you connect over composite to see if it makes a difference display wise? |
21 July 2015, 21:12 | #5 |
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Tested amiga without keyboard and floppy drive connected to exclude any cause, when connected to the floppy drive and insert a floppy no drive click or loading,the screen goes white, grey, white, but the startup screen doesn't appear.
Last edited by danko; 22 July 2015 at 09:39. |
22 July 2015, 17:01 | #6 | |
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Quote:
Just uploaded AmigaTroubleshooterPART 1 and 2 to the zone. Its in PDF and pic format, check it out. The pic versions are a tad blurry so have included the "more readable" PDF version as well. Pay particular attention to Part 2 under heading - -Power up Problems 1. No Workbench Prompt: There is a lot of info there that should be helpful. Had the same exact problem on one of my A2000's some 15 years ago. Think the problem was a small resisiter on m/b that died. Yours could be something else. Keep us posted on your progress. |
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20 September 2015, 13:41 | #7 |
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Hi,sorry for the latey,in according with AmigaTroubleshooter:
POWER UP PROBLEMS 1. No workbench prompt: Screen goes from dark grey to light grey but does not display 8520 U7 Odd CIA (U300 A2000) 8364 U3 Paula (U200 A2000) EMI 1301 1ohm resistor (R309 Rev. 6A/7 boards; R200 A2000) 8370 - 8372/8375 U2 Fat Agnus (U101 A2000) 74LS32 U37 Replaced 1 Ohm 1 Watt resistor and amiga works fine,but after power off and want to power on the problem occurs again, I have to wait a bit to make it work I do not understand. |
20 September 2015, 20:20 | #8 |
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A500 will boot without the even CIA in place so remove it and try to boot. try all your CIA chips in Odd CIA socket. Remove keyboard, unplug all peripherals, unplug floppy drive and any expansion cards etc
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21 September 2015, 10:33 | #9 |
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Hi,try without even CIA at power on black screen and unplug all,only motherboard connected,try CIA chip removed from working amiga the problem still the same.
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07 August 2019, 22:58 | #10 |
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