Simple Modification On Sony LED TV
This 32″ Sony LED TV came in for repair with the complaint of stand by power problem and it blinked 6 times. I checked from the Sony error code the meaning of blinking 6 times means and it could be problem in the LED Backlight (weak LED backlight), LED Driver or Display fault. From experience, I had solved this kind of problem before and must replace with three Sony LED strips.
The problem now I do not have such strips. What I had was the LED strip from LG and Singer and they were not match with the Sony LED strips.
Since I do not have the original Sony LED Strip, I have decided to ground the LED drive supply IC protection pin.
Below is the IC part number BD9397EFV datasheet and you can click on the photo to view the datasheet:
Just connect a 10 K Ohm resistor between pin 31 (CP) and ground by following the diagram below:
After the modification and powered On, the display appeared and it seems to have solved the 6 times power blinking issue in this SONY TV.
Conclusion- The above simple modification by adding just a resistor disabled the protection circuit in the IC. What I want to tell you is that, this TV has no longer protection against faulty LED backlight and etc. It is meant to confirm that the actual fault was with the issue of backlight itself only and no other circuit problem. Once I got the new Sony LED strips, I will fix in the original strip and will remove the resistor and I can confirm that with the original Sony LED strip, the TV will run again normally. Have a good day and will see you again in the next article.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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