Electronics Repair FAQ & Testimonials-Part 26

Comments Off on Electronics Repair FAQ & Testimonials-Part 26

Hi Jestine ,

Can i check with you ,  if i measure the VCC pin of the power ic UC3842 and i get the reading not constantly example 11.xx dcv jump to 14.xx dcv then go down to 12.xx dcv and then up again , normally which parts did i need to check . Thanks

HI Chong,

It can be the IC itself have problem, the supply vcc line e-cap ESR value have shoot up or even if there is components shorted in the secondary side preventing the ic to start up. I suggest that you check all secondary output diodes first and filer caps, then optoisolator ic then back to the power ic.  Sometimes corresponding components to the power ic also could have problem

Read More

Electronics Repair FAQ And Testimonials- Part 25

Comments Off on Electronics Repair FAQ And Testimonials- Part 25

Hi Jestine!

Good day!

Thanks a lot for your e-mail.

I’m so glad and happy to tell you that I have already repaired a number of electronic equipment with the help of your ebooks.
It’s not only profitable but the joy of self-achievement are wonderful.

Thanks again and I wish you and your family good health and more power to you on your career!

With my best regards,

George




Read More

Electronics Repair FAQ And Testimonials- Part 24

Comments Off on Electronics Repair FAQ And Testimonials- Part 24

HI Roland,

Good day Jestine,

Good day!

I would just like to inquire with regards to a burned varistor. I had a electronic control  board that has burned varistor and the part number was also

burned. Is there any way or technique that I can do to replace the burned varistor. i have measured the varistor and has a value of 27ohms which is i believe that is shorted and keeps on blowing the fuse.

Yes you are right by right it should not have any reading.

Read More

Electronics Repair FAQ and Testimonials-Part 23

Comments Off on Electronics Repair FAQ and Testimonials-Part 23

Hi Gasant,

1)      Does the transformer supply the  Drain leg of Fet with power

The drain is just like a switch controlled by the gate and the supply is coming from the transformer.

2)      Does the Drain leg of the Fet make the run dc circuit.

Run dc ac signal source is from one of the output of the secondary winding in primary side. The primary winding have to be energized in order to get the ac signal source from the secondary winding.

Read More

Electronics Repair Faq and Testimonials -Part 22

Comments Off on Electronics Repair Faq and Testimonials -Part 22

hi
long time and happy new year, we are doing well in KENYA. i need help on this LCD monitor and i have seen this problem on Lcd Tv  eg  if I type the letter A on MS Word, there will be a shawdow A next to it.

HI Ibu,

Thanks and happy new year to you too. In your case if all the output voltages are good and stable then the problem is in the lcd panel.  Try reflow the lcd controller/t-con board and if still the same then you may need to replace the LCD panel.

Read More

Recent Posts

Electronics Repair Archives

Electronics Repair Questions & Answers
General Electronics Repair
LCD Monitor Repair
CRT Monitor Repair
Test Equipment Repair
CRT Television Repair
Testimonials