Amiga 500 REV 5 Don't Boot Screen White and Grey

[danko]

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?

[Franchute13]

Hi Danko!
Try cleaning all sockets.
I had the same problem with REV 6 and CIA socket.

[danko]

Originally Posted by Franchute13

Hi Danko!
Try cleaning all sockets.
I had the same problem with REV 6 and CIA socket.

Done with clean contact spray without any result.

[dirkies]

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?

[danko]

Originally Posted by dirkies

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?

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.

[stevsurv]

Originally Posted by danko

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.

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.

[danko]

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.

[kipper2k]

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

[danko]

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.

[danko]

Originally Posted by danko

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.

The problem is a original kickstart 1.3 chip.