Replacing Two Resistors Solved Three Blinking Problem In SONY LED TV KLV32R402A
While I was getting my TVs rectified with the guidance of my friend at his shop, he also asked for my help in attending to a few of his pending work. That is how I opened this set and just carried out the instructions given by him. The problem in this TV was it just shuts down after a brief display and blinks three times. According to him, the blinking codes 1 to 4 in this type of TV is related to power supply problems.
This TV used an external AC adaptor to provide 19.5V supply. There is a secondary power distribution circuit inside the mother board. He marked two resistors on the board and asked me to remove them and replace with two he gave me. Here is the picture of the board and the marking done by him:
He told me that the voltage at the output of these two resistors should be around 2V and if the value of the resistors increase, this shut down happens as the uController senses the change in current flow and takes protective action. When we measured, the voltage was around 2.67, which was more. The input before these two resistors read the full power supply.
So, here is a clue to those who are facing similar problems in this type of TVs. I just carried out the replacement of these two resistors, one 82K and another 10K (incidentally, the 10K resistor was not black and looked like a cap!). The TV worked ok, with a few horizontal lines on the top. As the person who brought the TV was a technician, who only wanted this problem to be solved, as he was capable of resolving the lines, we closed the TV and allowed it to run for some time.
Mission accomplished, with satisfaction………….(Well, you can guess, I need not have to say (LOL) (Sorry as I could not cover the entire process with more pictures!)
This article was prepared for you by Parasuraman Subramanian from India. He is 72 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 T-CON Board IC Complaint And Backlight Issue Resolved In SONY BRAVIA KLV-32S400A
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Anwar Shiekh
August 12, 2022 at 9:28 pm
You have a clever friend
Parasuraman Subramanian
August 13, 2022 at 11:00 pm
Many thanks for your comments!
Babu M S
August 12, 2022 at 10:19 pm
Thank you very much sir.Your given very good article to solve the such a problem.
Parasuraman Subramanian
August 13, 2022 at 11:01 pm
Many thanks for your comments!
Albert van Bemmelen
August 12, 2022 at 10:24 pm
Repairs like these probably only can be solved by engineers who are specialized in fixing these uncommon tv defects in a for them daily base routine!
Parasuraman Subramanian
August 13, 2022 at 11:01 pm
Yes, very true! Many thanks for your comments!
Suranga Bandara
August 12, 2022 at 10:52 pm
Good Job Mr. Parasuraman.
Well done.
Thanks for Share it.
Parasuraman Subramanian
August 13, 2022 at 11:02 pm
Many thanks for your comments!
Waleed Rishmawi
August 13, 2022 at 2:15 pm
a job well done on the repair. that is a new information for me. thanks for sharing. have a blessed day
Parasuraman Subramanian
August 13, 2022 at 11:03 pm
Many thanks for your comments!
Lynn Blakely
August 14, 2022 at 4:35 am
Good Job Parasuraman: using suggestions from someones experience by credit given, then completing the job is rewarding. We would also like to know the rest of the story, about the lines at the top, to complete the repair. It appears your friend already knew both solutions, but being a friend he let you do one of the fixes.
Parasuraman S
August 15, 2022 at 9:39 am
The TV was brought by another technician. My friend did what he was asked to do by that technician. What another technician did is unknown. May be the customer was ok with the lines and he would have let it go. Many thanks for your comments!
Waleed Rishmawi
August 15, 2022 at 7:04 pm
guess what? in my comment I said I did not face this kind of problem before but this morning I had a exactly the same TV and with the same exact problem and thanks to your article I was able to fix the TV. thanks for sharing..have a blessed day
Parasuraman S
August 16, 2022 at 9:21 pm
Vow! That is a strange, but pleasant coincidence! Ha Ha!
Waleed Rishmawi
August 17, 2022 at 4:05 pm
yes I had the same TV but clearly after doing what you did to solve the issue, the TV came on but there was something wrong with the back light as well. so I had to replace one of the LED strips and the TV is up and running. I appreciate the help. have a blessed day
Parasuraman S
August 18, 2022 at 5:05 pm
Please replace all the strips at a time. There will be mismatch in current drawn between old and new LEDs. It will fail again soon, otherwise.
Waleed Rishmawi
August 20, 2022 at 2:29 pm
Parasuraman: I replaced the faulty strip only with the same exact one from another broken TV, the customer is not interested in paying for replacing the whole lED strips on that TV. have a blessed day
Parasuraman S
August 21, 2022 at 3:20 pm
OK! So, you can enjoy a second service on the same TV for same complaint soon! (LOL) Thanks to this customer!
Osman
August 16, 2022 at 3:35 am
Can we check MOSFET on board ?
Parasuraman S
August 16, 2022 at 9:23 pm
Yes. But if there are resistors connected between legs, it might not show correct reading. You have to use an analogue multimeter and check with probes and interchange them to know the result. Even then, resistance through other active or passive components can misguide.
Yogesh Panchal
August 19, 2022 at 6:44 pm
Directions are Must to reach the destination...as your colleague helped you with proper directions.
Parasuraman S
August 19, 2022 at 9:19 pm
Yes, very true!