Intermittent White Display Problem Solved In SONY LED TV Model KDL-43W800D
This TV was brought to me with a complaint of white picture by a regular customer. I switched it on and found it to be working very well. He told me that it was intermittent. So, I kept it on and checked for any such problems for two days and could not find any and returned the TV. But it was brought back with the same complaint but with five blinking codes this time.
So, I knew that the TV required opening and further investigation. Five blinking in Sony is an indication of panel related problems.
In order to get access to the T-Con board, we need to remove the mother board and metal plates and yen number of associated fittings. Finally the T-con board was located under the mother board:
One of my techie friends told me to check the voltage of the 1.8V regulator IC. I found it to be missing. But while checking, the TV started working indicating that dry solder was the problem. I retouched the pins with fresh solder upon which the TV worked for some time and again it went into ‘coma!’ Since the exact replacement of the buck IC which converts 3.3V to 1.8V was not available, I used AMS1117-1.8V which is rated for 1A. The IC used in the T-con was rated for 1.5A. The difference was that the IC used in the board was having, pin 1 as input, pin 2 (heat sink) as ground and pin 3 as output.
But AMS1117 has Pin 1 as ground, Pin 2 (heat sink) as output and Pin 3 as input. So, I could not fix it in the same place. So I fixed the replacement IC on a copper clad sheet in order to keep it cool. Then cut the two legs of the IC on the board and wired the replacement IC appropriately. I used red wire for 3.3V input, black wire for ground and orange wire for the 1.8V output. Let us have a look at connected pictures:
I kept the board on a plastic case temporarily as it should not touch the ground by mistake and allowed the TV to run for sufficient time as a test. The IC was not getting hot and I felt confident that it would work fine. Then placed a few pieces of LED backlight sticking tapes at the bottom and covered the top with thick double sided insulation tapes so as to ensure that it does not touch the metal plate of the mother board which would be on top of it. Then stuck this board close to the T-con board and replaced the mother board and associated fittings like before. I tried to take a photo of the board fixed under the mother board and perhaps you could make out something from it:
I allowed the TV to run for several hours and even tested it next day morning before giving delivery.
Mission accomplished with vigor and enthusiasm which resulted in extreme satisfaction that got qualified for entry into the collection bag!
This article was prepared for you by Parasuraman Subramanian from India. He is 74 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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You may check on his previous article on Futile Attempts By A Techie Necessitated Panel Replacement In MI LED TV L32M5
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19 Comments
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Waleed Rishmawi
July 19, 2025 at 6:33 pm
Very creative repair. Good one. Have a blessed day
Parasuraman S
July 19, 2025 at 8:22 pm
Thanks, dear friend!
Imoudu
July 21, 2025 at 4:24 am
I notice the R45W ic was not soldered off t-con,while the 3 wires from 1117 was soldered to joint R45W on board, why this method,I thought the original ic is defective,which necessitate to use 1117.
Parasuraman S
July 21, 2025 at 9:45 am
I had mentioned that I cut the legs and used the points to solder the 1117. I did not want to remove the IC causing strain to the T-Con Board. I would have removed it, if a replacement was available. Moreover, the 1117 has different pin configs, and should be fit in a place to dissipate heat generation. That's why I used this method! Many thanks for your comments and querry, dear Imoudu!
Albert van Bemmelen
July 19, 2025 at 6:46 pm
Not being able to find the components with the exact right pinconfiguration is always a bummer. But it didn't stop you there even from using a max 1A available regulator instead of the original 1.5A one. Assuming you measured the max current that would go through the T-con board to be safe?
Parasuraman S
July 19, 2025 at 8:23 pm
No, I did not measure. I just relied on the advice of my techie friends! Many thanks for your expert comments, dear Albert!
Humberto
July 19, 2025 at 7:24 pm
Good repair Parasuraman, I really confess I do not like to repair TV sets
Parasuraman S
July 19, 2025 at 8:24 pm
Well, interests vary! Many thanks for your comments, dear Humberto!
Mark J
July 20, 2025 at 2:52 am
Parasuraman another great repair job. Your the Sherlock Holmes of electronic repair.
Parasuraman S
July 20, 2025 at 9:54 am
Ha! Ha! Many, many thanks, my dear Mark!
Mark
July 20, 2025 at 2:13 pm
Well done Parasuraman.
Yogesh Panchal
July 21, 2025 at 5:05 pm
Good Job!Sir,
Arranging exact replacement parts is a challenge nowadays, and you need to have the ability to think out of the box.specially for this type of component where part of the body is internally connected to one of the live pins & body also becomes live.if by mistake it gets touch to chassis while installing it will make job more difficult to repair.
Parasuraman S
July 21, 2025 at 8:10 pm
Very true, dear Yogesh Bai! We need to be extraordinarily careful! Many thanks!
Natarajan
July 21, 2025 at 7:32 pm
Mr.Parasuraman
Thanks for a nice article. Sharing the problem you have encountered
in fixing a faulty TV set.
With regards
Natarajan
Parasuraman S
July 21, 2025 at 8:11 pm
Many thanks, dear Natarajan!
Anthony Paterson
July 22, 2025 at 10:30 pm
A creative repair whose efficacy will be determined by the TV's continued operation. Well done!
Parasuraman S
July 23, 2025 at 7:33 pm
Many thanks! Let us keep our fingers crossed!
Muykit
July 24, 2025 at 2:03 pm
Keep on keeping on. Please keep on giving us more on TV repair, the Jestine Yong electronic articles, even without video, have greatly improved my previously low repair knowledge. I've focused my interest mainly on TV repair. I cant thank you enough. Gods blessing.
Parasuraman S
July 24, 2025 at 6:35 pm
Many thanks! Don't worry! There are already many in the queue! Await its release periodically by Jestine Yong!