at my Wits End, New Membrane for A500 and Keyboard Still not Fixed :-(

nathanm1991 · 01 June 2018, 14:16

Hi There People I was just wondering if I am Missing something or just being Plain Stupid but I bought a new Membrane for my A500 as Return, Enter and Right Shift Doesn't Work and is Still Exactly the Same now with my New membrane in. Could I try anything else that may fix this?

Thanks

Daedalus · 01 June 2018, 14:20

Hmmmm, well the membrane is usually the problem, but a problem with the membrane connector on the keyboard PCB, or with the keyboard controller IC, could have the same effect. Check for bad solder joints or cracked traces on the PCB itself. It's entirely possible that you have a faulty controller chip.

nathanm1991 · 01 June 2018, 14:38

is the Controller Chip Attached to the Keyboard itself? I had a bit of luck with the enter key that has come back to life just no Right Shift or Return Still lol but I will check the solder joints now. The membrane is now brand new so I have eradicated one problem at least

nathanm1991 · 01 June 2018, 14:39

Going to try the old membrane in another a500 with a completely unresponsive keyboard as I am thinking now that this membrane may still be ok

nathanm1991 · 01 June 2018, 16:22

I Swapped the Keyboard Controller over From another and Return and Right shift are still the only ones not working. Should my next port of Call be to have a look at the Contact pad Beneath the Keys themselves?

nathanm1991 · 01 June 2018, 16:58

have near enough Sorted it, Swapped out a few pieces from the dud keyboard and now have return and right shift wahoo. enter and 0 on numerical pad aren't working at the moment so going to swap the contact pads out of another. Very happy now :-)

chue · 01 June 2018, 17:07

You could also try some electrical contact cleaner spray. Just make sure you use the kind that will not harm plastic.

nathanm1991 · 01 June 2018, 17:28

Success!! All keys are working now I just have to push 0 and enter quite hard but the rest is now sound :-)

Daedalus · 01 June 2018, 22:57

Sweet

Sounds like it's a tired old keyboard, maybe had a couple of drinks poured over it at some point. Glad it's sorted now anyway!

nathanm1991 · 02 June 2018, 13:56

thanks buddy

Jope · 04 June 2018, 09:06

The old paper trick works well here.

If the rubber pads connected to the key plunger are shiny, use a piece of paper from your printer (fold it a few times so that there are no sharp edges), wipe the rubber pad with the paper until it is no longer shiny. Clean off any paper dust with compressed air, be sure there is no dust on the membrane, reassemble.

nathanm1991 · 29 June 2018, 00:33

Just Found this old Post of mine, Thank you all for the Help unfortunately the Plungers were too Far gone, Another Kind member is now helping me as I couldn't find this post, Made a new one after Discovering Faulty plungers and have now got 5 coming soon :-)

01 June 2018, 14:16	#1
nathanm1991 Self Diagnosed Noob! Join Date: Apr 2018 Location: Malvern, Worcestershire Age: 32 Posts: 704	at my Wits End, New Membrane for A500 and Keyboard Still not Fixed :-( Hi There People I was just wondering if I am Missing something or just being Plain Stupid but I bought a new Membrane for my A500 as Return, Enter and Right Shift Doesn't Work and is Still Exactly the Same now with my New membrane in. Could I try anything else that may fix this? Thanks

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01 June 2018, 14:20	#2
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,379	Hmmmm, well the membrane is usually the problem, but a problem with the membrane connector on the keyboard PCB, or with the keyboard controller IC, could have the same effect. Check for bad solder joints or cracked traces on the PCB itself. It's entirely possible that you have a faulty controller chip.

01 June 2018, 14:38	#3
nathanm1991 Self Diagnosed Noob! Join Date: Apr 2018 Location: Malvern, Worcestershire Age: 32 Posts: 704	is the Controller Chip Attached to the Keyboard itself? I had a bit of luck with the enter key that has come back to life just no Right Shift or Return Still lol but I will check the solder joints now. The membrane is now brand new so I have eradicated one problem at least

01 June 2018, 14:39	#4
nathanm1991 Self Diagnosed Noob! Join Date: Apr 2018 Location: Malvern, Worcestershire Age: 32 Posts: 704	Going to try the old membrane in another a500 with a completely unresponsive keyboard as I am thinking now that this membrane may still be ok

01 June 2018, 16:22	#5
nathanm1991 Self Diagnosed Noob! Join Date: Apr 2018 Location: Malvern, Worcestershire Age: 32 Posts: 704	I Swapped the Keyboard Controller over From another and Return and Right shift are still the only ones not working. Should my next port of Call be to have a look at the Contact pad Beneath the Keys themselves?

01 June 2018, 16:58	#6
nathanm1991 Self Diagnosed Noob! Join Date: Apr 2018 Location: Malvern, Worcestershire Age: 32 Posts: 704	have near enough Sorted it, Swapped out a few pieces from the dud keyboard and now have return and right shift wahoo. enter and 0 on numerical pad aren't working at the moment so going to swap the contact pads out of another. Very happy now :-)

01 June 2018, 17:07	#7
chue Registered User Join Date: Feb 2018 Location: United States Posts: 81	You could also try some electrical contact cleaner spray. Just make sure you use the kind that will not harm plastic.

01 June 2018, 17:28	#8
nathanm1991 Self Diagnosed Noob! Join Date: Apr 2018 Location: Malvern, Worcestershire Age: 32 Posts: 704	Success!! All keys are working now I just have to push 0 and enter quite hard but the rest is now sound :-)

01 June 2018, 22:57	#9
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,379	Sweet Sounds like it's a tired old keyboard, maybe had a couple of drinks poured over it at some point. Glad it's sorted now anyway!

02 June 2018, 13:56	#10
nathanm1991 Self Diagnosed Noob! Join Date: Apr 2018 Location: Malvern, Worcestershire Age: 32 Posts: 704	thanks buddy

04 June 2018, 09:06	#11
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,914	The old paper trick works well here. If the rubber pads connected to the key plunger are shiny, use a piece of paper from your printer (fold it a few times so that there are no sharp edges), wipe the rubber pad with the paper until it is no longer shiny. Clean off any paper dust with compressed air, be sure there is no dust on the membrane, reassemble.

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29 June 2018, 00:33	#12
nathanm1991 Self Diagnosed Noob! Join Date: Apr 2018 Location: Malvern, Worcestershire Age: 32 Posts: 704	Just Found this old Post of mine, Thank you all for the Help unfortunately the Plungers were too Far gone, Another Kind member is now helping me as I couldn't find this post, Made a new one after Discovering Faulty plungers and have now got 5 coming soon :-)