Set Top Box Remote Control Repaired
Received again one Set top box remote from our residential neighbor, stating Button 1 & 2 are not working. Rest of all buttons are working ok.
I checked Remote with my TV, found same problem as stated below:
So it is time to inspect it from inside.
Opened the remote & tested again but there is no LED indication while pressing key 1 & 2. Removed rubber keypad for inspecting the circuit. Checked traces for any type of damages but everything seems Ok. So First step is to clean the PCB using IPA or thinner.
Here I used IPA. After cleaning I checked again still same problem. Now I applied Hot air using hair dryer & let the PCB cool down. Again using IPA, I cleaned the PCB & dried up it again using hot air, then using Pencil I applied carbon coating on every key contacts & kept the PCB to set it for few minutes.
Now for testing I kept rubber key pad on the remote,
on testing I found now red light is coming on while pressing Keys 1 & 2.
Reassembled the Remote & tested with the TV,
now it is working smoothly.
Handed over the remote to my neighbor for testing it on his TV, & he checked & replied me now it is working 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 on Received Creative SBS 240 Speakers For Repair
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Imran
June 29, 2024 at 4:49 pm
Nice pencil trick.. Thanks
Yogesh Panchal
June 30, 2024 at 10:55 pm
Thanks! Imran
Parasuraman S
June 29, 2024 at 5:01 pm
Using pencil for a recoat of the carbon is something new to me. Shall try it next time! Many thanks, dear Yogesh!
Yogesh Panchal
June 30, 2024 at 11:02 pm
Thank you! Sir,
I was using the trick from school time, Once my father gave me his Casio Calculator for get it repair,i went to near by watch repair shop & there i saw this trick.
sometime real time Practical experience taught you something out of the box.
Anthony Paterson
June 29, 2024 at 5:05 pm
Yogesh, a very useful repair article. What retains the graphite on the underside of the rubber key surfaces - and does it provide a long term repair? Could you have proved the circuit board was OK by shorting out the keypad on the circuit board?
Yogesh Panchal
June 30, 2024 at 11:17 pm
Thanks! Anthony Paterson for your comment.
This is environmental effect where you have heavy humidity weather this type of problem is happen ,Keypad traces are coated with some conductive substance which get degraded because of either heavy use or environment effect.i found 50% problems in IR Remote is keypad contacts & others are of batteries, i never came across circuit failure till the date.About a long term repair.....it works in my cases.
Albert van Bemmelen
June 29, 2024 at 5:55 pm
What carbon coating did you apply Yogesh?
Albert van Bemmelen
June 29, 2024 at 9:54 pm
In the past I found a much better fix after I found a cheap gold marker pen on Aliexpress that better sticks onto those rubber/silicon pads. Other marker pens are still available like these that probably also work.
Yogesh Panchal
June 30, 2024 at 11:21 pm
Albert, Thanks for info but this marker pens does not have shelf life so repair is not economical.
Yogesh Panchal
June 30, 2024 at 11:19 pm
Albert,I Used Normal Pencil.
Waleed Rishmawi
June 29, 2024 at 6:40 pm
good job on the repair and thanksf for sharing. have a blessed day
Yogesh Panchal
June 30, 2024 at 11:22 pm
Thanks! Waleed
Imoudu.O
July 1, 2024 at 4:57 am
Good repair!!