English Amiga Board Amiga Lore


Go Back   English Amiga Board > Support > support.Hardware

 
 
Thread Tools
Old 20 August 2017, 04:27   #1
majestyx
Registered User

 
Join Date: Jul 2017
Location: PA - USA
Age: 48
Posts: 11
Amiga 4000 mouse port - no up or down movement

I swear, it seems like if it wasn't for bad luck I'd have no luck at all. No sooner do I finally get my A4000D/040 into good modern shape, lo and behold, the mouse port decides to stop moving the mouse up and down. It will move left and right, the buttons work too, but no vertical movement.

As a test, I played Speedball 2 in 2-player mode. The joystick port (port 2) works fine - all movements and button works fine. When I plug the joystick into the mouse port (port 1), it moves side to side and the button works, but when I push down, it moves down then quickly reverses and moves up instead. If I push up then down a few times, it will finally move down, but when I let go, it almost always moves up again.

I've tested it with 3 different mice and they all act the same way so it must be the port. Any advice on what's happening and how to fix it?
majestyx is offline  
AdSense AdSense  
Old 20 August 2017, 15:07   #2
cpiac64
Registered User
cpiac64's Avatar
 
Join Date: Apr 2010
Location: Italy
Posts: 861
trace interrupted or 74hct166 dead
cpiac64 is offline  
Old 20 August 2017, 16:42   #3
Daedalus
Registered User

Daedalus's Avatar
 
Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 2,170
Possibly also a short on pin 1 due to corrosion or some sort of residue, or a failure of the relevant pull-up resistor (R981). If pin 1 is constantly active (low), the mouse will never move up or down, but joysticks will behave as you describe. The '166 chip is also a candidate as suggested, but I'd check the stuff between it and the port first.
Daedalus is offline  
Old 21 August 2017, 12:05   #4
alexh
Thalion Webshrine
alexh's Avatar
 
Join Date: Jan 2004
Location: Oxford
Posts: 11,880
Battery acid corrosion is the most common reason for failure. Get it open asap
alexh is offline  
Old 30 August 2017, 19:34   #5
majestyx
Registered User

 
Join Date: Jul 2017
Location: PA - USA
Age: 48
Posts: 11
Even though I had removed the leaked battery and cleaned up the residue months ago, the mouse movement issue just started happening when I originally posted. I'm guessing it did more damage than what it actually looks like. I've sent the motherboard and processor board out for recapping and for work on any additional damage that was done by the battery leaking. Just hoping it can be fixed since other than this, it was working quite smoothly.
majestyx is offline  
Old 30 August 2017, 20:54   #6
Daedalus
Registered User

Daedalus's Avatar
 
Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 2,170
Yeah, it can sometimes be almost impossible to clear leakage fully from a board. It gets under tracks, under components, into vias, all of which can be very difficult to clean up fully. What little is left will slowly eat away at the traces until one day, maybe years later, something fails. The good news is that such a fault should be a simple enough repair, so don't worry too much
Daedalus is offline  
AdSense AdSense  
 


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Jerky Mouse movement on AMIGA CD32 - normal ? Nibbler support.Hardware 29 02 January 2016 21:38
Amiga Mouse Movement over VNC Enverex support.WinUAE 10 15 March 2015 18:28
Mouse no horizontal movement - a1200 TomVS support.Hardware 8 13 November 2009 07:57
Amiga 4000 Mouse Port Bootay support.Hardware 17 23 June 2009 21:24
Jerky mouse movement andreas support.WinUAE 3 02 June 2002 19:14

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 01:04.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Page generated in 0.15083 seconds with 14 queries