Main Cause of 2 Blink Error in Sony KDL-40CX520

Sony KDL-40CX520 2 Blink Error Solution This set came to the LED TV repair workshop for repair. As soon as I switched on the set, it started blinking 2 times. The customer said that this set was completely accurate, but suddenly it went to a 2-blink error. I told him to give me some time; I will diagnose it and let you know later. I thought there must be a fault in its power supply. this article, we will go ahead and diagnose and trace this fault step by step.

Power supply test

I checked its power supply first; for this, I enabled the power supply and checked its voltages, especially the 12-volt supply, because in these models, if the main 12-volt power supply is disturbed, it goes into a set-2-blinking error protection. To enable this supply, I connected its main 3.3V to the power-on pin. With this method, you can test the power supply well. Anyway, my supply was completely accurate. Now the next step is to test the main board.

• Test the power supply thoroughly to ensure it is working properly. 

Diagnose 2 Blink Error in Main Board

How to trace the Sony KDL-40CX520 2 Blink Error fault on the main board Let’s talk about it. The system IC needs a reference that it gets from the main 12V. For this, voltage divider resistors are used. R1 and R2. This voltage divider determines how much voltage signal the system IC will receive. In the main boards of this series, this voltage can be from 1.6 to 2.1 volts. Now how do we search for this voltage divider? There are so many resistors on the main board.

• Search for your desired voltage divider on the main board.
• The resistance of this voltage divider is very carefully measured. 

How to Identify Reference Voltage Fault

How to Identify Reference Voltage 2 Blinking Error In the main board, I have my own formula. The voltage divider resistor is made up of two resistors. First of all, you have to search for such resistors, one of which goes to ground and the other to the main power supply, 12 V. I will also explain the method of identifying them. Set your multimeter to buzzer and connect your voltage divider to the twelve-volt power supply. The resistors that will make the supply

connection will be your R1, and the other will be ground. R2. Their center point will be going to the system IC. In some models, there is also 100 ohms in series here. In this way, you can diagnose every blinking fault. There can be three or four such voltage dividers in the Sony LED TV circuit, each of which has its own responsibility. For example, 3 blinks, 4 blinks, or, in some models, there is also a reference of 6 blinks – 5 blink.

Fixing 2 Blink Error KDL-40CX520

Now coming to this specific 2-blinking error, in this set I found R1 22K of its voltage divider whose value had increased a lot, due to which this fault was being generated. The ground resistor R2 was fine. I replaced both of these and installed the main board in the LED TV. After rechecking everything, I switched on the TV, and my 2-blink error was fixed. I tested this set thoroughly and delivered it to the customer.

• Fault 2-Blink Error.
• Solution Voltage Divider Resistance Fault.
• Replace 22k-R1 resistance 2 blinking red light fault fix.

Conclusion

Fixing 2 Blink Errors KDL-40CX520 As you can see, in this article we have fixed a common but difficult fault. I am sharing my experience so that what I have written may make someone’s work easier, and those who are new to the task may be interested in finding the original fault. It is not necessary to change the board but to change the entire board. What a difficult task it is. If you have any questions about this article, you can ask in the comment box. 

FAQ

1. What does 2 blink error mean in Sony Bravia LED TVs?

A: In a Sony LED TV, 2 blinking errors mean there is a problem with its power supply.

2.Is 2 blink error always related to the main board problem?

A: This error usually occurs on the main board, depending on the model.

3.How can I check the reference voltage in Sony KDL-40CX520?

A: I have written the article above on the same, and it contains full details.

4.What is the permanent solution for 2 blink error in Sony LED TVs?

A: Only a good and professional technician can give you a permanent solution. Once the fault is fixed properly, it will not

👉 If you want to read about the LG 32LK330 Restart Problem Fix, click here.

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