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