Mouse no horizontal movement - a1200

11 November 2009, 13:03

After having bought several a1200 mainboards on Ebay. I finally got one working.

On problem : the mouse does not move horizontally.
vertical ok, buttons ok
The mouse works with no problem on my a600
I replaced the mouseport on the a1200 with a new one (It is an a1200 with wired mouseport, not the fixed-on-the-mainboard one)

So far no luck...

Any suggestions ?

Bamiga2002 · 11 November 2009, 15:13

Replace the mouse port ribbon cable from motherboard mouseport if your mobo uses that (mine does).

11 November 2009, 15:16

I replaced that ribbon cable already.
I sometimes got mouse movement with the new cable , thought it was fixed but...
The horizontal movement died again

Photon · 11 November 2009, 18:39

Tried with another mouse? If it's the same problem then, perhaps you need to replace a chip. Could be bad contact in the mouse port too ofc.

Jope · 11 November 2009, 21:12

The mouse cable might also be broken.

Photon · 11 November 2009, 23:33

Yeah, at least for PC it usually affects the point where the cable goes into the mouse, you can try to cut off 10cm and solder it to the right points inside the mouse. But if you can, try with a known working mouse so you know where the problem is!

Or try the mouse in another Amiga, if it works then the mouse is okay ofc.

12 November 2009, 10:00

The mouse works in my a600

The mouseport in the a1200 was replaced by a new one

problem remains

Merlin · 12 November 2009, 12:34

Faulty capacitors could be pulling down the supply voltage to the CIA chip that controls horizontal movement. The fact that you say that it occasionally works would support this. I would be looking to replace the capacitors as it's not an expensive fix and they will die eventually anyway.

13 November 2009, 07:57

Seems like a logical explanation.

I will have to boost my (de)soldering skills

Thank you

11 November 2009, 13:03	#1
TomVS Posts: n/a	Mouse no horizontal movement - a1200 After having bought several a1200 mainboards on Ebay. I finally got one working. On problem : the mouse does not move horizontally. vertical ok, buttons ok The mouse works with no problem on my a600 I replaced the mouseport on the a1200 with a new one (It is an a1200 with wired mouseport, not the fixed-on-the-mainboard one) So far no luck... Any suggestions ?

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11 November 2009, 15:13	#2
Bamiga2002 BlizzardPPC'less Join Date: May 2004 Location: Finland Age: 46 Posts: 3,210	Replace the mouse port ribbon cable from motherboard mouseport if your mobo uses that (mine does).

11 November 2009, 15:16	#3
TomVS Posts: n/a	I replaced that ribbon cable already. I sometimes got mouse movement with the new cable , thought it was fixed but... The horizontal movement died again

11 November 2009, 18:39	#4
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,655	Tried with another mouse? If it's the same problem then, perhaps you need to replace a chip. Could be bad contact in the mouse port too ofc.

11 November 2009, 21:12	#5
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,911	The mouse cable might also be broken.

11 November 2009, 23:33	#6
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,655	Yeah, at least for PC it usually affects the point where the cable goes into the mouse, you can try to cut off 10cm and solder it to the right points inside the mouse. But if you can, try with a known working mouse so you know where the problem is! Or try the mouse in another Amiga, if it works then the mouse is okay ofc.

12 November 2009, 10:00	#7
TomVS Posts: n/a	The mouse works in my a600 The mouseport in the a1200 was replaced by a new one problem remains

12 November 2009, 12:34	#8
Merlin AmiBay MegaMod Join Date: Mar 2007 Location: Manchester, UK Age: 62 Posts: 1,163	Faulty capacitors could be pulling down the supply voltage to the CIA chip that controls horizontal movement. The fact that you say that it occasionally works would support this. I would be looking to replace the capacitors as it's not an expensive fix and they will die eventually anyway.

13 November 2009, 07:57	#9
TomVS Posts: n/a	Seems like a logical explanation. I will have to boost my (de)soldering skills Thank you

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