No Power In Vitron LED TV Repaired
VITRON LED TELEVISION MODEL HTC3228 DEAD NOW REPAIRED
First let me confess that this was a repeat repair, for those who have been in this field for sometimes you all know how frustrating repeat repairs are. You receive equipment from a customer; work on it to your satisfaction, paid amount in full for job well done and after one to few days the customer is back with the same problem. In my case I received this television initially with the symptoms “no picture but audio present” and I repaired it seamlessly by replacing a single capacitor.
For more details on how I solved that problem kindly refer to this article on my blog here.
When the television was brought back I did some initial test and I realised that the television this time round has no audio and no picture and the power ON led is red(stand by). No amount of pressing the power ON button would get it out of this mode.
Since I had no idea what could be the problem from the initial tests I decided to put it aside for two days without even opening it.
I gathered courage and I decided to open it and went straight to the capacitor I replaced previously hoping it is still the one causing the problem only to find that I was wrong, the capacitor was found to be in good health and therefore I should check elsewhere.
Live voltage testing is one of my favourite troubleshooting method but this time I forgot it and found myself touching every I.C top with the back of my finger like a mad man.
To my surprise I noted almost all I.Cs were getting very hot, I tried to locate any component which was shorted and I got none.
With that I decided to call the owner and update him on my progress and told him that from the looks of it the problem is quite deep and the chances of survival for the television are slim.
He asked me what is the way forward, I advised him to consider an opinion of another tech and hear his views also before making final conclusion, he told no need just keep it for your spares.
My friend electronics just like medical profession need a second opinion, if your doctor tells you, your leg need amputation (God forbid) just ask him or her for a few days to organise yourself, go to other medics and hear their views and if all have the same conclusion then it means amputation is the best option for you but in most cases you will find it could be a simple solution for your problem and keep your leg etc.
Now that I have been given go ahead to send it to the dustbin, I decided to try one more time and then send it to the junk bin. So I opened it and this time decided to explore beneath panel to check the LEDs and see how they are behaving. Here you need to open the panel slowly and carefully otherwise chances are high of breaking the screen which I consider supper fragile and expensive to replace.
After opening it I decided to test the LEDs by using LED TV backlight tester and noted the two branches were dim. I isolated one branch and noted one branch lights with intensity but the other was still dim. I now concentrated on the dim one and tested one led at a time and found only one led was shorted.
Having no spare for the single LED and since the TV was already condemned; I decided to use a jumper wire across the faulty LED
After re-testing again using LED backlight tester I got all the LED now bright like the other branch.
I re-assembled the panel slowly and carefully and returned everything to its respective place and after applying the power the television came up beautifully. I told the owner of the television about the good report via what’s-up since he works out of the county and was much impressed by the breaking news.
I returned the television to his family and now we are in the second week and the television is still working!
Thank you friends
Stay safe.
Humphrey Kimathi is from Nairobi Kenya and the author of
1) Lcd-Led television repair guide
3) CRT Television repair course and
4) Basic Electronics course.
He is also a blogger at Electronicsrepairmadeasy.com
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Note: You may check out his previous post in the below links:
https://jestineyong.com/lg-led-television-model-32lb561u-dead-power-on-led-red-now-repaired/
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22 Comments
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L. Selvaa kumar
May 13, 2019 at 8:50 pm
Thanks nice
Humphrey Kimathi
May 14, 2019 at 3:48 pm
Thank you Kumar
Regards Humphrey
Ghashaan
May 13, 2019 at 9:12 pm
A great read! But I'm still confused about why the TV was totally dead while there was some intensity in the backlights.
I have also learned that it's always good to test the backlights if no apparent problem is found in other areas.
Was there any distortions in the picture due to that one LED that was missing?
Humphrey Kimathi
May 14, 2019 at 3:55 pm
Hi Ghashaan, when the TV came back the second time there was nothing on the screen, like I said it was stuck in stand by mode, after re-assembling yes there is a small dark spot where the led was missing but hard to notice unless if was keen.
Regards Humphrey
Rebecca
September 6, 2022 at 2:58 am
Thanx for the information
Parasuraman S
May 13, 2019 at 10:19 pm
Your honesty and innocence is prominent and should be well appreciated first, as it is becoming rare! Congratulations on your achievement! A good lesson learned and shared with us! Many thanks!
Humphrey Kimathi
May 14, 2019 at 3:57 pm
Thank you and welcome my friend Parasuraman.
Regards Humphrey
Yogesh Panchal
May 13, 2019 at 11:06 pm
Sir
Good trick when you are confused for any matter about What/where/How????
just keep the matter beside and give your self time to get into the refresh mode...........definitely you will get positive result.
Humphrey Kimathi
May 14, 2019 at 4:00 pm
Well put Yogesh
Regards Humphrey
Albert van Bemmelen
May 13, 2019 at 11:16 pm
An interesting repair but one that I'm afraid could come back if the current trhough the remaining leds and the voltage over them is higher then it was before. Which is likely the case.
Although it is strange that you needed to bridge over the led that already was shorted. It must have been behaving erratic being a bad connection instead.
Humphrey Kimathi
May 14, 2019 at 4:07 pm
Thank you for your input Engineer Albert, I concur with you on every point, about Led shorting or erratic again you are spot on, one cannot replace short with short but I believe the jump wire had some resistance and maybe acted like a lot ohm resistor.
Regards Humphrey
Devon Wilson
May 14, 2019 at 6:24 am
God's richest blessings in your life's endeavours. Thanks for sharing your experience.
Humphrey Kimathi
May 14, 2019 at 4:09 pm
Thank you and welcome my brother Wilson.
Be blessed too.
Regards Humphrey
beh
May 14, 2019 at 11:15 am
Hi Humphrey
Thank you so much of this article but what about the Audio of the TV you you did not told any thing
cheers
beh
Humphrey Kimathi
May 14, 2019 at 4:12 pm
HiBeh, after the operation everything was restored back to normal, maybe the TV was going to shutdown mode.
Regards Humphrey
Robert Calk Jr.
May 14, 2019 at 1:03 pm
It is good that you got the TV repaired and returned to the customer, Humphrey!
Humphrey Kimathi
May 14, 2019 at 4:15 pm
Thank you Sir Robert.
Regards Humphrey
Tito Kanshulu
June 4, 2019 at 11:47 pm
Good work Humphrey and well explained. i like the way you articulate things. keep it up
Gladys
April 2, 2020 at 3:03 pm
Hey Humphrey, my vitron smart tv is switching off hadi place it says smart TV then off, what could be the problem?
Aduda
July 1, 2021 at 11:01 pm
Thanks for your article which has enriched me. I have vitron 32 inch which went blank after a thunderstorm. The TV was off but on socket when it all happened. What do you suspect could be the problem? Your advice will be appreciated since I have few skills in electronics.
Douglas
December 9, 2021 at 1:54 am
Happy evening Humphrey
My Vitron TV screen turned black but sound is ok what would be the issue?
Isaac kariuki mwangi
May 30, 2022 at 9:27 pm
Hy my tv vitron 43inch has no light but it's has a sound what's is the problem pliz