An LCD Computer Monitor Repaired- Model: HN19K
This is an old LCD computer monitor that was flickering when powering it up. After a few minutes it shuts down completely and the stand by light goes dead too. From Experience, usually this is a problem in the power supply either the primary or the secondary and it had to do with capacitors gone badly.
To my surprise, I did not see any bulged capacitors in there. In fact, I think someone was working on this LCD monitor but did not get it fixed for some reason. Anyway, it is time to put my ESR meter in action and find out which capacitor is causing this problem.
It took me about an hour and I found about eight capacitors that displayed a high ESR reading. There were five capacitors 1000uf with different volts, two 220uf / 50, 25 volts, and one capacitor that is 2.2uf/50 volts. It took me another half an hour to put the new capacitors in and I powered up the LCD monitor and I could see NO SIGNAL sign being displayed on the LCD panels and that is a great indication that this monitor is working fine. The primary colors red, blue and green were being displayed as well.
I called the customer and he was happy to see it come to life. He explained to me that this LCD monitor was sitting in his storage room for almost a year. He had sent it to a guy to fix it but it was not fixed. I was happy that I was able to fix it and it only took me less than two hours to finish the job. I am so thankful for the ESR meter and I recommend it to any repair guy who wants to cut down on repair time and to increase his repair percentage rate.
As you can see above, the LCD is alive again and it is displaying the picture of my favorite English team Manchester united.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment. Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
By the way if you have any good repair article that you want me to publish in this blog please do contact me HERE.
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beh
July 14, 2013 at 10:26 am
HI MR RISHMAWI
thanks for another good repair from you
but
please tell me did you check the cap s inside the cir cute or out side
beh
Shihab Kably
July 14, 2013 at 8:10 pm
We all recognized high percentage of capacitor failure in modern electronic circuits. some people think it is because capacitors quality is lower than before.
i think it is because these capacitor is being used in higher frequency circuits than before which shortens its lifetime.
what do you think?
Waleed Rishmawi
July 14, 2013 at 10:16 pm
that is the beauty of the ESR meter. I usually check it inside the circuit. it is faster this way. I do not have to take them out, discharge them and then check them. the ESR meter does the job and cut down on repair time.
Waleed Rishmawi
July 15, 2013 at 2:41 pm
Shihab. thanks for the comment. yes, I agree on the quality issue. they used to make them better but on the frequencey issue I am not so sure. capacitors have life period. they work like they are made to work then it stops working simple as that. any comments from others are welcome. we can actually discuss this issue.
Amir Mukhtar
July 16, 2013 at 11:24 pm
Thanks you Again Sir Jestine and Mr. Waleed
The above article is an informative and learnable.
God Bless you
yours Student
Amir Mukhtar Ashrafi
Waleed Rishmawi
July 18, 2013 at 3:53 pm
Amir: you are welcome.
owais akhter
October 30, 2013 at 12:57 am
Nice one article which showing value of using ESR meter. Great job Mr. Waleed. I will be always thankful to Mr. Justine Yong who recommend Blue ESR Meter. This is the best test gear in my workstation. As i think about less life of E-Caps is because of LCD SMPS is fully covered in LCD monitor casing and shielding.I always replace E-Caps with good quality brand with 105 degree temperature.
tahir
November 15, 2013 at 12:02 pm
Thank you sir jestine and and mr waleed the tips are brilliant they really do help a lot thanks