English Amiga Board

Go Back   English Amiga Board > Support > support.Hardware

Thread Tools
Old 06 March 2008, 02:40   #1
Registered User

scrappysphinx's Avatar
Join Date: Jan 2008
Location: Nottingham
Age: 34
Posts: 463
A500 Boot Problem

Hi Guys, i picked up 2 boxed 500 Machines, both upgraded to 1mb with trapdoor ram, 3 'tank' mouses, 2 joypads, 2 Modulators, original workbench disks v1.3 and v2.05 and a 500 PSU from my local admag paper tonight.
Advert said all in working condition for £15.
Having watched a few standard A500's on ebay fetching around £15-£20 i thought this would be a decent deal.
However upon arrival they guy said that the PSU had blown while testing during the day but the amigas were fine.
I eventually bought the lot for £10.

I got home and tested my 1200 PSU on the 1st 500 and it booted up fine stating workbench 1.3 and the familiar hand/disk logo.
I then tried the 500 PSU on the 1200 and that too booted up fine.
So now i have a working A1200 & a working A500 and two working PSU's.
I then turned my attention to the 2nd 500. I tried plugging in both PSU's but i got nothing on screen and no power/floppy LED.
I thought it might be a loose chip inside so i opened up both the working and non working 500's to look for any obvious differences.
I pulled out, cleaned and reseated all chips on the dead 500 and plugged in the PSU.
I now have power getting the board but the power LED on the amiga just flickers on and off very fast.
When connecting a scart i get a white flash on screen.
I removed all chips from working board and seated into dead board but still get the fast power LED flashing and white flash on screen.
I then took all the chips i had removed from the dead board and placed them into the working board.
Working board still booted up fine so i assume all chips are ok.
I have swapped the ram upgrades over incase it was a dead upgrade preventing boot but still getting same flashes.
On the dead 500 if i get my ear close to the mainboard i can hear a ticking somwhere around the denise or 68000 chip, anyone have ideas?
Could this be a simple fix or is it looking like a dead board?

Many Thanks

scrappysphinx is offline  
Old 07 March 2008, 11:15   #2
Registered User

scrappysphinx's Avatar
Join Date: Jan 2008
Location: Nottingham
Age: 34
Posts: 463

I continued to play around with the motherboard and now instead of a white flash i get a sort of green/blue flash.
The ticking is still there though.
Any ideas?


scrappysphinx is offline  
Old 07 March 2008, 11:31   #3
2 heads are more than 1
CRAZG's Avatar
Join Date: May 2007
Location: Tauranga / New Zealand
Posts: 38
Try resoldering any capacitors in the area of the "ticking".
CRAZG is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Software Failure on boot A500+ desantii support.Hardware 8 10 November 2010 09:51
Random color on boot (A500) 8bitbubsy support.Hardware 2 29 April 2010 09:30
Weird A500 boot-up behavior 8bitbubsy support.Hardware 8 25 October 2009 21:10
A500 Video/Boot problem. Aura Sensation support.Hardware 9 13 February 2008 13:13
A500 doesn't boot when 512k ram added! memothejanitor support.Hardware 1 25 June 2007 11:51

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +2. The time now is 13:01.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Page generated in 0.08938 seconds with 13 queries