Sony KDL-46HX750 Power Supply Repair Faulty MIP2H2 IC Replacement

Sony KDL-46HX750 Power Supply Repair Faulty MIP2H2 IC Replacement

Sony KDL-46HX750 LED TV recently arrived with a serious issue: it was completely non-functional. The TV wouldn’t power on, and even the pilot light was off. This indicated a likely power supply issue, which we resolved by replacing a faulty component, the MIP2H2 IC. Below is a detailed account of our diagnostic and repair process.

Problem Overview

When the TV was brought in, it was in a dead condition—neither the screen nor the standby pilot light showed any signs of power. Upon initial testing, it became clear that the 3.3V supply voltage was missing, which is critical for the TV’s startup circuit to function.

Fault Finding Process

A step-by-step investigation of the power supply board was conducted to identify the exact fault.

Checking the Fuse:

The fuse on the power supply board was tested with a multimeter and found to be intact.
The 220V AC input was confirmed to be reaching the board.
Inspecting the Main Capacitor:
The main capacitor was checked and found to hold the correct DC voltage, verifying that the rectification stage was working properly.

Tracing the 3.3V Circuit:

The circuit responsible for generating the 3.3V voltage was analyzed.
The MIP2H2 IC, which steps down and regulates the voltage to 3.3V, was tested and found to be receiving power from the main capacitor.
All surrounding resistors and capacitors were inspected for damage, but they were in perfect working condition.
Confirming the Fault:
Despite proper input voltage and functional surrounding components, the MIP2H2 IC failed to output the required 3.3V.
This confirmed that the IC itself was defective and needed to be replaced.

Sony KDL-46HX750 Power Supply Repair Faulty MIP2H2 IC Replacement
Ic replace

Repair Process:

Replacing the Faulty MIP2H2 IC
Once the fault was confirmed, we proceeded with the repair:
Removal of the Faulty IC:
The defective MIP2H2 IC was carefully desoldered from the board to avoid damage to the PCB traces.

Installing a New IC:

A brand-new, high-quality MIP2H2 IC was soldered in place with precise connections to restore functionality.

Testing the Board:

After replacing the IC, the power supply board was tested with a multimeter. The 3.3V output was successfully restored.
The repaired power supply was reconnected to the TV, and the TV powered on normally.

Observations and Learnings

This repair highlights that the MIP2H2 IC is a common failure point in the Sony KDL-46HX750 power supply. Despite proper functioning of other components, the IC itself is prone to damage over time due to electrical and thermal stress. Regular maintenance and timely replacement of such components can help prevent extended downtime and further damage to other parts of the TV.

Visual Reference

To help other technicians and customers understand the issue, here are detailed images of the
process:

Voltage Testing:

Sony KDL-46HX750 Power Supply Repair Faulty MIP2H2 IC Replacement
3.3 voltage test point

Conclusion

If you are experiencing power-related issues with your Sony KDL-46HX750 or other Sony LED TV models, our experts at the Sony LED TV Repair Center in Lahore are equipped to provide fast, professional, and reliable service.

Sony KDL-46HX750 Power Supply Repair Faulty MIP2H2 IC Replacement
Sony KDL-46HX750 Power Supply Repair: Faulty MIP2H2 IC Replacement

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