how to repair 5 blink-sony klv 40bx450
A Sony LCD model KLV-40BX450 recently came to my workshop for repair, displaying the infamous 5 blink fault. This fault is commonly observed in Sony models and is usually linked to the panel itself. In this detailed guide, I’ll explain how I identified and resolved the issue step by step. Whether you’re a professional technician or an enthusiast, this guide will help you tackle the problem effectively.
Understanding the 5 Blink Fault in KLV-40BX450
The 5 blink fault is a diagnostic error code used in Sony LCDs like the KLV-40BX450. When the TV detects an internal fault, it shuts down and flashes the standby light five times repeatedly. This is typically caused by a malfunction in the panel, though other issues can also contribute. Proper inspection is essential to determine the exact cause.
Fault Finding Process for KLV-40BX450
1. Initial Inspection
After opening the unit, the first step was to inspect the LVDS (Low-Voltage Differential Signaling) strip. This strip connects the main board to the panel. I tested the LVDS strip and found that it was functioning correctly without any issues.
2. Checking Panel Voltages
Next, I supplied external power to the panel and measured its DC-to-DC voltages. All the required voltages were present, indicating that the panel was not shorted.
3. Inspecting the Scalar Strip
I then moved on to the scalar strip near IC2. After carefully examining the components, I found that the resistors and capacitors were in working condition. However, the inductor coils labeled B1 and B9 had increased their values significantly.
These inductor coils are responsible for supplying power to IC2. The increased values were disrupting the power supply to the IC, which was likely the root cause of the fault.
Repairing the Fault in KLV-40BX450
Replacing the Inductor Coils
To fix the issue, I replaced the faulty inductor coils B1 and B9 with new ones of the correct specifications. After replacing the coils, I powered on the TV to check the results.
To my relief, the TV turned on without any blinking fault and started functioning perfectly. This confirmed that the issue had been successfully resolved.
Visualizing the Fault
To make this repair process easier to understand, I’ve included a detailed image of the fault area. The image highlights the faulty components (B1 and B9) and their locations on the scalar strip. Visual references like this can be immensely helpful for technicians and hobbyists alike.
how to repair 5 blink-sony klv 40bx450
Conclusion
The 5 blink fault in Sony KLV-40BX450 is often related to the scalar strip components, particularly the inductor coils. By carefully diagnosing the issue and replacing the defective parts, you can restore the TV to working condition.
If you’re dealing with a similar fault or need assistance, feel free to reach out to our workshop. We specialize in Sony LED and LCD repairs and are here to help you with any issues you might encounter!
how-to-repair-sony-klv-40r302c-dead-tv
