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Dead TV Back To Life

By Jestine Yong on September 23, 2023

This Bush model tv was brought to me by a new customer who was informed about me and his complaints was tv is dead. Opened back case, did visual checks and observe the following damages: Power IC P1014AP1O cracked, resistor-like inductor near ac input opened, input ac glass fuse burnt, 3 e-caps at secondary side defective. Surprisingly the mosfet was intact.

So I got a new power IC from a local store and replaced all defective components, remove fuse and connected l00w bulb to its terminals and power on….what!!! the bulb light was brightly lit and remain lit, meaning there is a short circuit, so who is the culprit?

I then desolder out fet and power IC and connected 3 wire power module and power on…. bulb flashes and off….no more short circuit. So suspection falls on mosfet or power IC, but I suspected power IC more. So I decided to purchase another power IC with different batch number, change the IC with a different batch number, then powered on through use of bulb again…., bulb flashes and goes off…. meaning no more shorted component, this confirms first IC is fake. Then checked secondary output voltages, which are ok:5.03V, 3.4V, 12.14V, 24.37V, 34.41

I then mounted smps on tv, connected all connector wires and power on…. Wow…tv came alive again.

Lets do a little investigation on the two power IC: (a)Looking at the cracked and fake IC, they both look identical with same “four” different numerical batch number while one used for repair on board has additional one capital alphabet ‘G’ to the batch number (b).

On both cracked and fake IC, there is no dot to identify pin 1, while the original on board has dot to identify pin 1 which is the Vcc.

This is 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 LED TV With Bright Spots Light On Screen Repaired

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lcd tv repair

8 Comments

Albert van Bemmelen

September 23, 2023 at 1:31 pm

Very impressive repair Imoudu!
I wonder who sold you this defect P1014AP1O power chip?

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Waleed Rishmawi

September 23, 2023 at 1:31 pm

that is a problem I usually run into which is fake IC's. the problem is when you install new IC and still a problem in the device sometime you never think of the new installed IC is bad so you keep wasting time checking and looking for another fault till you finally realize it is the new installed fake IC is the main problem. things we go through every single day. thanks for sharing and have a blessed day

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- Imoudu.O
  
  September 24, 2023 at 2:02 am
  
  Albert & Yogest.P
  Thanks sirs.
  
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Parasuraman S

September 23, 2023 at 1:49 pm

Yes, the fake components really waste our time and sometimes cause more damage too! Many thanks for sharing!

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Yogesh Panchal

September 23, 2023 at 3:23 pm

Good Fix! Imoudu

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Imoudu.O

September 24, 2023 at 1:58 am

Waleed.R
Falling victim to purchase those fake ic's have effect on our income, and sellers usually don't want to make a refund when complaints is made.Thanks friend.

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Imoudu.O

September 24, 2023 at 2:00 am

Parasuraman.S
Thanks sir.

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Tito Kanshulu

September 28, 2023 at 6:17 pm

Thanks Imoudu for the nice rapair. Fake components have flooded African markets these days. I feel if you there is someone in the group with the knowledge of genuine parts should one share, so that we are kept in the know. Maybe Jestine can tell us one or two things

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