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Logitech Internet Pro Desktop Keyboard Repaired
Fault symptom: Some keys are not working.
I was typing a letter in Word and I found some keys were not working so with doubt of dust I have removed the cap of the key and looked inside for dust but everything was ok, no dust in key area.
After putting back the key cap again I have checked by typing each letter and to my surprise the row from Z to M was not working.
So I opened the keyboard for further inspection.
Checked PCB for burn out and dry solders but everything seems ok
Now it is time for further investigation hence I have start tracing the track by continuity testing. Everything is fine near the suspected area. While inspecting the trace location I found some traces going towards upper side Multimedia shortcut key area.
So I moved a head towards Multimedia short cut key and started testing continuity on traces; there I found the continuity is losing the signal on one location while inspecting through magnifying glass I have noticed the trace coating is damaged for reconfirm for the fault again I have checked with Multimeter and I found the culprit area .
Now the problem is this trace are not normal copper traces where you can just solder jumper wire directly.
This trace are Conductive Paint so how to repair this trace? It needs special conductive paint pen; few years back for this type of problem I have ordered the pen “ONLINE” but this type of pen is not having more shelf life and it got dried within 3 months. Do not buy if you are not having regular work like this.
You can get two new keyboards instead price of the conductive pen.
Here I have used one old trick which was used earlier for repairing calculators; yes using simple Pencil just rub the pencil lead on damaged trace paint and you have done with the patch.
After the patching work completed I have checked the keyboard for working and I felt glad to save one unit from scraping. It worked perfectly fine.
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 in the link below: