LED Watch Repair
The complaint of my LED watch was no light. It seems like no power and could be due to sign of low battery problem.
The first thing to do is to open up the back cover and start checking it-see the photo below:
I took out the battery and check with my voltmeter and it was measured good- 3.06 volt.
Next I checked the two buttons for good contact and both contact buttons were checked to be good.
After checking the battery I found that the crystal oscillator one of the leads seem to be rusted and not in good contact with the circuit board. I took out a penknife and scrap off the rusty area applied fresh solder onto it-see the photos below:
I really got a surprised that my watch was working again-see the photo below. This means in the future if your watch is giving problem it can also be due to bad crystal oscillator if the battery check to be good.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Note: You may check out previous post about fixing active speaker in the below link:
https://jestineyong.com/panasonic-portable-stereo-component-system-repair/
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Parasuraman S
June 19, 2017 at 9:09 pm
Good Work! Yes, I have found a similar rusted crystal in the watch. It is due to sweat get in or moisture formed due to body heat!
Albert van Bemmelen
June 19, 2017 at 11:41 pm
Never seen such a watch before. Quite a unique repair, Mr.Suranga.
In my common cheap LCD watches moisture often oxidizes the battery contacts. With green contacts (oxidized copper) as a result. I often just have to open my watch and clean the battery contact and afterwards it runs again for a couple of years. (The battery itself is still fine in those cases but just gets a bit green on one side, but even new batteries tend to oxidize without ever having been used).
And if I'm not mistaken someone told me that they therefore do not use Gold contacts in refrigerators but Silver instead?
Gerald Musy
June 20, 2017 at 12:18 pm
What an interesting watch Suranga. I have never seen one like this.
The crystal is a good tip that I will keep in mind.
Thanks for sharing
Cheers,
GM
Mark Tembo
June 22, 2017 at 9:49 pm
Nice article, brief and educative!
Thanks.
Yogesh Panchal
June 22, 2017 at 10:06 pm
Good Job! Suranga.
Dilum
September 2, 2017 at 10:22 am
Good work bro..!