Universal 32″ TV Wouldn’t ‘Power On’
This TV was brought to me with complaints of not powering on. This TV had been repaired by me before (see article 23/2/22). I opened the back case, did physical observation, no sign of any faulty components, so l did voltages test on the combo mother board at various points, these were present: 12V, 5V, 19V, 3.3V, 12V,1.16, but 1.8V was absent.
So I checked on mosfet responsible for switching on 5V to voltage regulator, which in turn generate 1.8V, this fet was good. So I suspected voltage regulator may be faulty, I replaced the 8 pins voltage regulator with a new one.
Then assembled everything together and powered on tv set: wowed it came on beautifully.
This’s the finished repaired work.
This article was prepared for you by Imoudu Onwumah from Nigeria. He is 62 years old and has just 3 years experience in electronics repairs. I started career in hotel industry as a chef, but then I was doing repairs only in electrical repairs as a hobbyist. In 2018, I decided to learn about electronics which through Jestine’s electronics e-books and holding my hand, am an electronics techie today.
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Note: You can read his previous article on TV Power Buttons Got Stuck
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Andrew F. Ali
July 8, 2023 at 9:30 am
Excellent job!!!
Parasuraman S
July 8, 2023 at 9:48 am
Excellent expert fix! Thanks for sharing!
Albert van Bemmelen
July 8, 2023 at 3:04 pm
I checked all articles about this tv to find out what 8 pins power regulator chip exactly was replaced but sadly the photos were too blurry and the type was neither mentioned here?
Tito Kanshulu
July 8, 2023 at 8:29 pm
Excellent job Sir, but you didn't give us the exact number of the regulator.
Yogesh Panchal
July 9, 2023 at 12:11 am
Good fix! Looks like Mosfet Driver which provide gate drive to the MosFet.
Waleed Rishmawi
July 9, 2023 at 12:46 am
Short and to the point but totally agree with Albert, the part number should be mentioned in the article. Have a blessed day.
Imoudu.O
July 9, 2023 at 3:12 am
Andrew.A
Thanks for your comments,have a nice day
Imoudu.O
July 9, 2023 at 3:51 am
Mr Parasuraman.S
Thanks for your comments,have a nice day sir.
Imoudu.O
July 9, 2023 at 3:52 am
Andrew Ali
Appreciate your comments,have a nice day.
Imoudu.O
July 9, 2023 at 3:59 am
Mr Albert Van
Appreciate your observation,the power regulator chip no is 1118 marked on it,you can also find it's datasheet on net,however not all combo tv mother board uses this chip.Have a nice day.
Albert van Bemmelen
July 12, 2023 at 11:14 pm
Thanks Imoudu for providing that information!
Not a controller chip I knew of. Good to know. I will look for that datasheet.
It strangely wasn't mentioned in the previous articles of this tv before either, why I asked.
Have a nice day too!
Imoudu.O
July 9, 2023 at 8:19 pm
Tito and others
My answer to Mr Albert's comments fixes all comments regarding the voltage regulator.Have a nice day all.