Symptoms of 6 Blinks Error on Sony KDL-40W660E
When handling the Sony KDL-40W660E 6 Blinks Error Fix, the symptoms are very clear and consistent. As soon as the TV is plugged in, it shows the Sony logo, then restarts by itself. After restarting, the logo appears again, and the TV turns off once more. This cycle repeats three times in a row, and after that, the six blinks error appears on the standby light. This clearly shows that the backlight is in protection mode, which keeps the TV from turning on normally. The screen stays completely black during this process, indicating that the TV will not work properly until the main backlight issue is fixed.
Diagnosing 6 Blinks on Sony KDL-40W660E
In the Sony KDL-40W660E, the LD Board is designed with separate sections handling different functions, including the audio amplifier IC and the backlight PWM IC, while part of the power supply is also integrated into this board. During the detailed diagnosis of the 6 Blinks error, it was observed that the backlight circuit was not functioning properly, causing repeated shutdowns. The issue was traced specifically to the BD9423EFV IC on chassis 9000, at pin 49, which was responsible for the backlight operation. The exact repair steps for this pin will be discussed in the following paragraph.
BD9423EFV IC Pin 49 Fault Fix
The 6 Blinks fault on the Sony KDL-40W660E was carefully traced to pin 49 of the BD9423EFV IC, which serves as the Low Voltage Malfunction Detection pin on the LD Board. This pin is connected to a voltage divider circuit consisting of two resistors, one going to ground and the other receiving the main 19V power supply. The resistor carrying the 19V supply had failed, with its original value of 120K having increased excessively to around 2.5M, disrupting the reference 5V at the pin. Replacing this resistor successfully restored proper voltage and fixed the 6 Blinks error, stabilizing the backlight and allowing the TV to operate normally again.
- The main fault in this TV was the 6 Blinks error.
- Pin 49 of the BD9423EFV IC was identified as the critical point affecting low voltage detection.
- A voltage divider resistor connected to 19V supply had failed, increasing from 120K to 2.5M, disrupting the 5V reference.
- Replacing the faulty resistor restored proper voltage to pin 49 and stabilized the backlight, resolving the 6 Blinks error.
- Repairing the original circuit instead of replacing boards preserves the TV’s quality and longevity.
My Experience with Sony LED TVs
In my experience, the 6 Blinks fault in Sony LED TVs is mostly related to the backlight. Usually, a faulty backlight string triggers this error, while only in rare cases is the issue caused by a problem in the backlight circuit area. A skilled technician should diagnose the fault step by step, considering every detail from start to finish. Any circuit issues should be fixed within the original board rather than replacing it. Many technicians replace the inverter board for convenience, which can shorten backlight life and affect reception. For more insights, readers can check our other 6 Blinks articles on the website.
KDL-40W660E LD board imageÂ
The picture of the complete LED board is given below, which contains the power supply, sound amplifier and backlight driver circuit. We have a detailed article On this IC titled BD9423EFV IC PDF Pinout & Diagram In this article we have explained this IC in detail. In the images below, you can see the voltage divider resistance that we have marked, which is causing the six-blink fault in this case. Sony LED TV Repair Center Lahore will continue to write original fault finding articles for you so that technicians and users can benefit from the content we share.Â
My fellow technician friendÂ
Note: This fault was solved by my very dear friend. I wrote it. It would be rude not to write his name here. That’s why I am writing this paragraph. My friend’s name is Saif-ur-Rehman. He is in DG Khan.Â
Conclusion
In conclusion, the Sony KDL-40W660E 6 Blinks Error Fix requires careful diagnosis and a step-by-step approach. Most of the faults are related to the backlight, usually caused by a faulty backlight string or issues in the backlight circuit area. As discussed, pin 49 of the BD9423EFV IC and its voltage divider resistors play a key role in triggering this error. Fixing the original circuit rather than replacing boards maintains the TV’s quality and longevity. By following proper repair steps and considering all backlight and circuit details, technicians can effectively resolve the 6 Blinks error.
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Shaukat Ali has over 30 years of experience in LED TV repair, specializing in chip-level repair work. He is an expert in Sony LED TVs, and also repairs other major brands like Samsung, TCL, Orient, and Haier. His expertise includes display panel faults, motherboard issues, power supply circuits, T-Con, and HDMI faults. Based in Lahore, he shares real-time fault finding cases from daily repair work to help technicians and learners with practical experience.
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