KDL-46HX750 Main Board Voltage Details A Complete Guide
Sony KDL-46HX750 Voltage Test Points – Detailed Overview If you’re a professional technician or working on repairing a Sony KDL-46HX750 LED TV, this guide is for you. Based on the image provided, we’ve labeled the key voltage points on the main board to assist you in fault diagnosis and repair.
Each voltage rail is essential for the proper functioning of different sections of the main board. Missing or unstable voltages can result in power issues, no display, or system failure.
Voltage Points and Their Locations
- 3.3V Test Point:
This voltage is commonly used for logic-level circuits and ICs. In the image, it is located near the component labeled IC8402P.
- 1.5V Test Point:
Often used by RAM and other low-voltage digital components. It is seen near the connector labeled CN9003.
- 1.2V Test Point:
This is typically the core voltage for the main processor or system IC. Found near the PS54425 power IC.
- 5V Test Point:
Commonly used for USB ports and other peripheral circuits. In the image, it’s shown at the bottom-right corner near the section labeled SC6002.
Importance of These Voltages:
Any missing or abnormal voltage can cause the main board to malfunction.
Checking these voltage points using a multimeter should be one of the first steps in fault finding.
Faulty voltage regulators or shorted components are common causes of missing voltages.
Pro Tips for Technicians:
If the TV does not power on, check the 3.3V rail first. It powers the system logic and control signals.
1.2V missing could indicate a dead or non-functional CPU.
If 5V is not present, check USB circuits or the standby supply section.
Conclusion
Understanding and verifying these key voltage rails on the Sony KDL-46HX750 main board is crucial for accurate fault diagnosis. With this visual reference and explanation, you can save time and avoid unnecessary part replacements.
Written by: Shaukat Ali – Sony LED TV Specialist, Lahore
*Copyright © 2025 Shaukat Ali