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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