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Did you make mistakes when repairing electronic?

By on July 14, 2012

I've got an email from one of my ERG members about "Did you make mistakes when repairing electronic?" and  "During your mistakes your skills improved overtimes?".

My answer to him was:

Uncountable-Yes I made tons of mistake and I've improved my skills overtime.

Here are just some of the mistakes that I have made that I could think of at this moment

1) Did not discharge the big fat primary side capacitor and causing 2 holes on my hand

2) Did not check the electrolytic capacitor polarity after replacement. The cap blown immediately I turned on the equipment

3) Forgot to fix back the Monitor Anode cap causing it to spark at the ground and burnt out the Horizontal Output Transistor (HOT)

4)  Did not check for dry joints in other circuit area till the set have to be sent back second time for repair

5) Did not use isolation transformer and the electrocution almost got me killed (dealing direct with live source back in the 90's)

6) Transistors and diodes placed the other way round shorting the components again

7) Did not test the equipment after repair throughoutly (burn in test) and this cause the customer have to send it back for second repair

8 Did not keep extra spare parts that is commonly use. It will be a waste of time running to town just to get one piece of part

9) Did not carefully check for solder bridge between components lead and this had caused the equipment not to work after repair

10) Bought cheap transistors (below market price) and it turned out to be incompatible even with the same part number.

I have made those mistakes and I have learned from it. I hope you also could learn from it without having to go through the above experiences. If you have mistakes that you have made we would like to hear about your story- please make a comment below thanks.



  1. John (Deaf Guy)

    July 15, 2012 at 4:08 am

    Frankly, you don't hide and you have passed the test during mistakes. We must make mistakes to corrected ourself to the next steps. The better we do will greatly approved our skills overtimes.
    Thanks for your continues feedback in learning all about electronic repair.
    John (deaf guy) 

  2. bogie

    July 16, 2012 at 12:50 pm

    I was in the night shift in my regular job and when i get home my friend brought a home theater that was dead and he ask me to repair emmediately. The unit was 110v so after some voltage testing i found that the problem was the regulator.After replacing the bad parts that i had found so its time to test the unit then BOOM!!! I mistakenlly plug it to 220v the varistor and fuse was exploded and a piece of glass of the fuse hit on my upper right eyebrow and emmediately the blood flow. The unit was not repair on that day.
    Lesson: Do not do electronic work when tired mostly sleepless...ha..ha..

    • Jestine Yong

      July 16, 2012 at 9:38 pm

      Hi bOGIE,

      Yes you are rigt and please do not repair any electronic equipment when we are in hurry or tire. This means a goggle also would help in protecting our eyes.



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