Keyboard Failure
The keyboard was the problem in another computer service call I made. It locked up in the middle of a program and wouldn’t do anything. This is the problem description I received. I took the keyboard with me to my service center and I plugged it into my computer and verify the problem. The keyboard would not respond at all. I noticed the number lock, caps lock, and scroll lock LEDs did not light when the computer booted up; ordinarily, during boot up these LEDs light momentarily. I wondered if the keyboard was getting power.
I remove the screws from the back of the unit and separated the two halves. The keyboard cord terminated into a five pin connector on a PC board. The circuit board had a few components, a microcontroller, and if you support components. The silkscreen on the board indicated the signals and voltages at the connector. I checked the connector to see if it was receiving power from the 12 supply. Noble did was present. I suspected an open in the keyboard cord. I flexed the court while I monitored the voltage. At one point midway in the cord I managed to obtain a reading momentarily.
Since I cannot find a direct replacement, I purchased the board extension cable and cut the connector on one end. I re-terminated the connector internally and test the keyboard; the keyboard worked fine. Keyboards are relatively inexpensive, but in some cases they can be repaired economically. It may be beneficial to exchange the defective keyboard for a customer and repair theirs for another job.
The personal computer can be an exciting and challenging piece of equipment to troubleshoot. On the other hand, it can also be time-consuming and frustrating. If you need help of experts, please visit Cincinnati Computer Repair. The personal computer, like all other consumer products, is changing rapidly.
