How to Fix Channel Problem in Sony KLV-40W652D
A Sony KLV-40W652D television arrived at my workshop with a channel-related fault. The issue was that the TV could not display channels properly, and upon closer inspection, I discovered that the tuner was not receiving the required 1.8V VCC supply, which is essential for its operation.
To diagnose the issue, I checked the voltage regulator IC6018, responsible for generating the 1.8V supply. I found that IC6018 was receiving a stable 5V input but was failing to produce any output voltage. This clearly indicated that the problem was with the regulator itself.
Next, I inspected the surrounding components, including resistors and capacitors, to ensure they were functioning correctly. All components were in good condition, confirming that IC6018 was faulty and needed replacement. I replaced the defective IC6018 with a new regulator, which restored the 1.8V VCC output.
After completing the repair, I tested the TV thoroughly, and the channels started working perfectly. The replacement of IC6018 resolved the issue entirely.
Fault Diagnosis Summary
1. Problem: Tuner not receiving 1.8V VCC supply.
2. Cause: Faulty IC6018 voltage regulator.
3. Solution: Replaced IC6018 with a new regulator.
Result
Replacing IC6018 restored the 1.8V VCC supply to the tuner, allowing the TV to function normally, with all channels working flawlessly.

Conclusion
This case demonstrates the importance of precise fault diagnosis in electronic repair. A faulty voltage regulator can lead to critical functionality issues, such as the tuner not working properly. By thoroughly checking the input and output voltages, inspecting surrounding components, and replacing the defective IC6018, the problem was resolved successfully. Proper diagnosis and targeted repair saved the TV from further damage and ensured its smooth operation.
Fault Area Marking
The attached image clearly identifies the fault area and highlights the faulty IC6018 component for better understanding and future reference.

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