How to fix 2 Time blinking red light on Sony KDL-55HX751
I came to a workshop for Sony KDL-55HX751 LED TV repair. As soon as I turned on the TV, the red light started blinking for 2 times. How to repair the red light blinking for 2 times? In this article, we will go through it step by step.
Cause of the Two Blink Error Fault
- The power supply’s own protection is activated, causing the 12-volt power to turn on and then turn off.
- The main board can also be the cause of this fault, meaning the 12-volt main line is not reaching the reference system IC.
Solution 2 blink step by step
In this case, we will first test the power supply.
Power supply test
An easy way to test a power supply is to disconnect its main jack. now connect the 10 number pin of this jack to the 13 number pin to give this power supply a 12 volt output voltage in the normal way. check the output voltage carefully, this voltage should be twelve to twelve and a half volts. if this voltage comes continuously, then our power supply is fine.
How to fix 2 blink fault on main board
Now let’s come to the main board. First of all, you have to find a twelve-volt line on the main board. From here, the reference voltage will go to the system IC. From this twelve-volt line, a voltage divider resistors system IC. This same voltage divider resistors’ common point will go to the IC at 1.6 volts. how do I search for this voltage divider if I don’t have the circuit diagram? In this model, these resistors are on the back side of the main board. I found these resistors with my multimeter. Check the resistance from the 12-volt line. Wherever the meter beeps, those are the resistances you need.
Fault diagnoses
When I found these resistors, I isolated them from the circuit with my heat gun and checked their value. They have R1 and R2. This is the term used. R1 is positive and R2 is negative. Their common point It goes to the system so that the system IC can know that the main power line is stable. However, in my case, the value of R1 had increased. Its original value was 22K. I changed it and my fault was fixed.
Conclusion
The conclusion is that this fault can occur in the power supply as well as in the main board. As far as my experience is concerned, it mostly occurs in the main board. It is very rare in the power supply. If at some point this happens in the power supply, I will definitely write an article on it and share that fault as well. I have not yet identified this fault in the power supply.
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If you found this guide helpful, make sure to check out our other repair tutorials for Sony LED TVs. Each article is based on real workshop experience to help you diagnose and fix issues with confidence.
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Shaukat Ali
Shaukat Ali is a professional Sony LED TV repair technician with over 30 years of experience. He specializes in diagnosing and fixing complex display and board-level faults. Based in Lahore, he shares real-world repair cases to help both customers and fellow technicians.