Keyboard stopped working! Ideas on a fix?

[aftyde]

Hi Everyone, my TI console no longer has a working keyboard.  Powers on just fine, comes up with the TI logo screen.  No key works.  It's like the keyboard is completely disconnected.  This is a daily driver.  It hasn't been moved and I love the keyboard actually - opened it up and reseated the cable.  No change.  Still - no key works.  Any ideas on what might cause the failure?  Thank you, Arthur...

[RickyDean]

4 minutes ago, aftyde said:

Hi Everyone, my TI console no longer has a working keyboard.  Powers on just fine, comes up with the TI logo screen.  No key works.  It's like the keyboard is completely disconnected.  This is a daily driver.  It hasn't been moved and I love the keyboard actually - opened it up and reseated the cable.  No change.  Still - no key works.  Any ideas on what might cause the failure?  Thank you, Arthur...

I'd first look at the cable on the TI keyboard where it is soldered to the PCB, that area fails a lot. Then if that is good, I'd change out the 9901 on the TI.

[aftyde]

1 hour ago, RickyDean said:

I'd first look at the cable on the TI keyboard where it is soldered to the PCB, that area fails a lot. Then if that is good, I'd change out the 9901 on the TI.

Can't seem to find a 9901.  I did check the keyboard cable and connection to the board - all good.  Sadly, most of the chips are soldered onto the board.  Checked the PCB where the keyboard cable is connected - seems good.  At least the pins tested OK.  No obviously toasted caps or resistors, no smell or other evidence that the magic escaped.  Any other ideas?

[RickyDean]

6 minutes ago, aftyde said:

Can't seem to find a 9901.  I did check the keyboard cable and connection to the board - all good.  Sadly, most of the chips are soldered onto the board.  Checked the PCB where the keyboard cable is connected - seems good.  At least the pins tested OK.  No obviously toasted caps or resistors, no smell or other evidence that the magic escaped.  Any other ideas?

Look here.

[aftyde]

14 hours ago, RickyDean said:

Look here.

There it is!  Given my eyesight and below average soldering skills - time for a new MB then. 

[Duewester]

@aftyde given the price of eBay 99s (depending on your location) a whole 99 is probably not far off the cost point of a chip or keyboard.

With the kb removed, I'd do a momentary key simulation at a "press any key" location to see if the chip responds.

 

[mrvan]

I feel for you. My console did the same thing a few months ago. I replaced the 9901 and all is well. Seems they may be easy to kill. I touched my console during a period of low humidity = static. Sad part is that I knew the conditions called out at the lab at work and then I went home and touched her.