Don't Miss

Visit To Car Factory

By on August 9, 2011

Today my partner and I went to a foreign car assembly factory in Shah Alam. Before we were allowed to enter the maintenance workshop we were asked to wear safety boot, safety helmet and a jacket that have the word "Visitor". The reason we went there was because we were asked if we could repair certain circuit boards for their welding control timer board. After careful inspection of the SMPS board, it should not be a problem in repairing it because most of the parts can be found from the market except the switch mode transformer. The board are using the PWM UC3844 IC, TL431, CNY82 opto and a common power FET.  This SMPS board is powered by 24 VAC instead of the 230 VAC. Besides the SMPS board they also passed to us another type of boards for other type of machine. They asked us to repair the 4 boards first and will continue to give use more boards if we could repair the 4 boards. Please click Read More to see the photos:

car factory

power supplies

car factory plant



  1. beh

    August 10, 2011 at 7:35 am


    these jobs are nothing compar to your background in electronics
    and experince in the field of repaire. i am sure you are successful
    like always
    best wishes

  2. admin

    August 10, 2011 at 7:37 am

    HI Beh,

    Thanks and hope to get more business from them after successfully repair all those boards.


  3. beh

    August 10, 2011 at 10:11 am

    i am sure you can repaire all of boards much better than first day of use
    and they will understand who are you . now it is too soon for them
    hope to that date

  4. arjunaidi

    August 10, 2011 at 11:58 am

    Hi Jestine,

    what tools do you bring to such visits?

  5. admin

    August 10, 2011 at 9:48 pm

    Hi Arjunaidi,

    I did not bring any tools because the management wanted to see us and check if we could repair the boards or not. I told them that i have to bring the boards back and will let them know later. I have just ordered a 24 volt transformer just to power up the SMPS.


  6. Bernard Lim

    August 11, 2011 at 4:10 am

    Hi Jestine,

    Wow should be a big job for you Master, by the look at these boards for you Jestine is not a problem , regarding the transformer it's always the difficult part. In repairing when there is no such spare parts then no matter how good we are it's still no use, like a phrase can see but cannot eat haha. have u try the China market for the spares, if u need i can show u some, maybe u also have known the dealers already. Wish you the success and i always know Jestine Boleh haha

  7. admin

    August 11, 2011 at 10:02 am

    HI Bernard,

    You are right, if no parts no matter how good you are there is nothing can do about it. At current moment i did not source parts from China because i do not have a big quantity. I would usually source from the local supplier. Yes you can forward to me the address to my email and i appreciate for that.


  8. Dante Rossi

    August 14, 2011 at 4:11 pm

    Hello,need some info please.I have a SMPS with UA3844 4N25 TL413
    Supply does not start,checked all parts and changed
    UA3844 and Mosfet.Any help?
    Also need the underlayer component layout and I'd,diodes
    May be reversed.
    Thank You

  9. admin

    August 15, 2011 at 5:07 am

    HI Dante,

    Make sure the power IC is receiving good voltage and that no shorted secondary diodes as well.


  10. Amir Mukhtar

    September 18, 2011 at 4:02 am


    There are two observations have seen in visit..

    1. Happily and exciting visit done for repair tasks and this is very
    Important and full of facilitation..
    2. Keen Interests are showing in repairing services. which is remarkable and reward able.

    therefore, I appreciate your services and satisfactorily works which have been providing consumers and corporate customers.

    Well Done.

    A student and Learner
    Amir MUkhtar

  11. Nelson Caballero

    July 3, 2013 at 10:08 am

    The way I see those boards are basic ckts. Im sure you can do it. Im 99.9 sure you can do it, except those xformers if those are avail.

    • Jestine Yong

      July 3, 2013 at 2:50 pm

      Hi Nelson,

      Yes I have done the repair and not tough.



Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.