This’s continuation of my experience as per article 973 of 29/7/22. The picture below (SMPS) is the cause of the damage.
As at the time I use it as external power to test LG dvd player, I had forgotten this same psb had previously damaged dvd from which it was extracted last year. So after the damage to the two led tv’s, I decided to repair the original psb of the LG dvd, below picture:
The repaired lg dvd also below:
I take this opportunity to thank all my techies friends who contributed their suggestions to me in the previous article. I did follow all suggestions and these has help me successfully.
The sony dvd/tv/radio player panel was just transferred to another brand device(GIEC) after a techie friend informed me the microprocessor of the sony is damaged. Picture below:
Now let see how LG 32″ LED TV was repaired. Let me first note that early this year I replaced the panel on this tv when it has a broken panel issue, and I use a panel from another LG model for replacement and this necessitated all those modifications and black tape you see. Now lets go on.
I check all voltages points on main board, all good, AV input to ground 75 ohms, all other components o.k. Then I move on to T-con board, check voltage input 12V o.k, vgh, vdd, vcom etc are all o.k except vgl which was 0.38 instead of -5V. Then I did finger touch on components, to my surprise, IC TPS65175 and IC 3NP are burning to touch, so I suspect problem must be between T-con and panel.
I then dislodge connector from T-con to panel side board and switch on and touch the two IC, no more hot, so this narrow problem to panel area. Then I check on panel side board, see what I observe picture below:
The panel cof area has slit and turn black as result of burnt I guess! So in other to know what went wrong, I connected everything back and switch on, guess what, the slit opening turned glow. If you observe the picture well, you will see some tiny thread like tracks inside the transparent film, so it was three threads out of these that had turned black and bridge together as a result of burnt and cause the panel to white with vertical lines.
SOLUTION: So as I notice the three burnt tracks are touching each other as result of burnt, I used razor blade to cut the three burnt tracks away completely and use thin transparent tape to cover the area. Then connected everything together again and switch on, guess what? TV boot and LG logo show up. I then connected external antenna to antenna input, see the result below:
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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A very detailed explanation of how you were able to fix the pending problems, that was indid an excellent repairs work. I love the step by step details given and your patience in tackling the problems one after the other, No giving up at all. I was actually expecting to here the solutions given to those compounding problems that almost looks frustrating.
A very good one indid. Keep on the good work Sir.
I was quite surprised to see this repair that mentioned "Then I move on to T-con board, check voltage input 12V o.k, vgh, vdd, vcom etc" and "all my techie friends" was this time not from dear Parasuraman, but from you Imoudu! It made clear that you are now very advanced in fixing tv panels! Well done indeed! And glad to see that you not only fixed the dvd power unit but now also all previously damaged devices because of that external defect smps unit.
Albert van,
Well,I guess you are one of my techie friends and all those who are on board on this platform.Thanks for your comments and have a nice day.
It's so encouraging to note improvement in your repairs,I have improved too but now What is left is to have courage to write some articles here to help others.Thank to Jestinè for great platform.
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Tayo
September 3, 2022 at 12:24 pm
Impressive repairs Dr. Frankenstein!
GIFT ELIJAH
September 3, 2022 at 1:06 pm
A very detailed explanation of how you were able to fix the pending problems, that was indid an excellent repairs work. I love the step by step details given and your patience in tackling the problems one after the other, No giving up at all. I was actually expecting to here the solutions given to those compounding problems that almost looks frustrating.
A very good one indid. Keep on the good work Sir.
Tito Kanshulu
September 3, 2022 at 2:41 pm
When you had cut the area, didn't the tv show anything as an after effects of the cutting? I want to understand on that part
Albert van Bemmelen
September 3, 2022 at 4:50 pm
I was quite surprised to see this repair that mentioned "Then I move on to T-con board, check voltage input 12V o.k, vgh, vdd, vcom etc" and "all my techie friends" was this time not from dear Parasuraman, but from you Imoudu! It made clear that you are now very advanced in fixing tv panels! Well done indeed! And glad to see that you not only fixed the dvd power unit but now also all previously damaged devices because of that external defect smps unit.
Parasuraman S
September 3, 2022 at 9:08 pm
Excellent hunt down to catch the prey! Well explained too! Many thanks for sharing to put this matter to an end!
Babu M S
September 3, 2022 at 10:14 pm
Fantastic way explained the defect.Many many thanks for sharing.
Imoudu.O
September 4, 2022 at 4:53 am
Gift
Hello my friend,thanks for the comments and have a nice day.
Imoudu.O
September 4, 2022 at 4:59 am
Tito
I did test the tv for about 3 hours on different days and it did not show any after effect,however time will tell in future.
Imoudu.O
September 4, 2022 at 5:09 am
Albert van,
Well,I guess you are one of my techie friends and all those who are on board on this platform.Thanks for your comments and have a nice day.
Imoudu.O
September 4, 2022 at 5:14 am
Parasuraman.S,
Thanks for your contributions to the success of this repair,have a nice day.
Abigail Karonga
September 4, 2022 at 8:40 pm
It's so encouraging to note improvement in your repairs,I have improved too but now What is left is to have courage to write some articles here to help others.Thank to Jestinè for great platform.
Henrique J. G. Ulbrich
September 5, 2022 at 12:52 am
Really great repair, Imoudu. Greetings for your patience. Shure, you are an expert. Just one doubt: I couldn´t understand what the word cof mean.
Yogesh Panchal
September 8, 2022 at 12:03 am
Excellent! step by step Repair.
Here Key word is "patience"