Logitech Keyboard Repaired For Not Responding
Customer sent me Logitech keyboard for not responding problem. On testing I found keyboard Num Light is ON but when pressing the button it not show any effect of LED on & Off seems keyboard is hanging while connecting on the computer even it is not responding in POST also.
So opened the keyboard for further inspection…
I have checked and cleaned silicon membrane Key dome sheet using Brush.
Now removed the main controller PCB for inspection
Component side everything seems Ok. Checked components on both the side found Ok.
So just taking chance by reviving carbon coating on PCB using Pencil.
You cannot do anything on contacts paint on plastic, it is not worth (in past I bought conductive marking pen but it dried up as it does not have more shelf life and even after applying it never last for long time) so I made my mind if not success then return it to the customer with advise him to Buy new keyboard…….
First I cleaned both the contacts using “IPA” and revived contacts on the PCB using pencil. Plugged the keyboard to my computer for testing after reassembling……& the keyboard start working.
Saved this unit going to earth fill by repair. Many technicians are not repairing it because they are not getting any return for time spent by them to repair. I have repaired it because it is under my AMC Contract with the customer.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Note: You can check his previous repair articles on Hair Dryer Repaired
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Parasuraman S
February 23, 2022 at 4:56 pm
Good fix and sharing of experience. Many thanks!
Yogesh Panchal
February 24, 2022 at 4:25 pm
Thank you! Sir
Waleed Rishmawi
February 23, 2022 at 5:52 pm
yes, sometimes only cleaning can do the job and that is fun too because the repair is not just fixing big problems. thanks for sharing and have a blessed day
Yogesh Panchal
February 24, 2022 at 4:26 pm
you are Right waleed, Thanks!.
Mark
February 23, 2022 at 6:07 pm
Thanks for sharing Yogesh. Sometimes a poor connection creates havoc.
Yogesh Panchal
February 24, 2022 at 4:28 pm
Mark,
Around 35% repair work are because of Poor Connections.
your welcome.
Albert van Bemmelen
February 23, 2022 at 7:12 pm
In cases like these I always would try to use silverglue if the foil tracks are damaged. And even if the silverglue in the small container bottle has dried out and got hardened it can be made fluid again easily with a bit of added acetone.
Yogesh Panchal
February 24, 2022 at 4:30 pm
Albert,
I will try silverglue see if it works.
Lynn Blakely
February 24, 2022 at 12:56 am
Dear Yogesh: Very good repair. to clean the contacts you used a pencil, did you mean eraser? IPA is always safe, I have used erasers to clean foil, and acetone to clean VCR heads using the the acetone on paper holding the whetted paper against the drum that spins, then turning the head without moving the paper. This was done on stubborn heads that IPA didn't work.The drum would always look like chrome.
Yogesh Panchal
February 24, 2022 at 5:11 pm
Lynn Blakely,
"First I cleaned both the contacts using “IPA” (Do Not use eraser)wipe it with lint free cotton cloth then revived contacts by rubbing Pencil Tip on Trace because pencil tip is made of Carbon & Carbon is a electric conductor.Never use acetone on any type of plastic or chances are high that plastic will melt down or get damage.
Gary Gemmell
February 26, 2022 at 8:02 am
I fix everything too - always look forward to your posts Yogi you do go the EXTRA mile!
>;O)
Yogesh Panchal
February 26, 2022 at 10:33 pm
Gary Gemmell,
You will never get disappointed on this blog,rather Every day we learn something new from articles of our colleagues & professionals.
Thanks!
Anwar Shiekh
March 16, 2022 at 10:58 am
I tend to put silicone oil on contacts as this discourages future corrosion.