orient-led-tv-panel-repair
When an Orient Eagle 40 FHD Black stops displaying a picture, it can be a frustrating experience. In this guide, we will walk you through the detailed process of diagnosing and repairing a common issue where the mainboard works fine, but the panel fails to function due to a faulty DT to DC IC.
Initial Diagnosis
The first step in troubleshooting any electronic device is to determine where the fault lies. In this case, the TV was disassembled, and the components were systematically checked. It was observed that:
The mainboard was functioning correctly.
The issue was traced to the DT to DC IC of the panel, which was not working.
This finding indicated that the problem was not with the mainboard but rather with the panel’s power supply system.
Fault Finding Process
To identify the root cause of the issue, the following steps were performed:
Voltage Measurement on the Scaler Strip:
A 3.3V supply was present, confirming that this portion of the circuit was operational.
However, the AVDD supply was missing, which is crucial for the panel’s operation.
Checking for Shorts
The AVDD track was inspected for any shorts, revealing a 1.2-ohm short circuit.
Since the AVDD voltage line connects to all the COFs (Chip Output Flex), the same short voltage was found across all of them.
This confirmed that a short circuit within the AVDD line was preventing the panel from functioning correctly.
Panel Repair Process
Repairing the panel involves addressing the short circuit and ensuring all related components are functioning properly. Here’s how the issue was resolved:
Short Circuit Repair
The short killer method was employed, where a 3.7V rechargeable cell was applied directly to the short circuit.
As the voltage was applied, a ceramic capacitor labeled CD19 on one of the COFs began to overheat, emit smoke, and ultimately detach itself from the board. This indicated that the capacitor was faulty and causing the short circuit.
Replacing the Faulty Component
The damaged capacitor CD19 was carefully removed and replaced with a new one of the same specifications.
Restoration of AVDD Supply
After replacing the capacitor, the AVDD supply was restored to its normal level of 17V.
Testing the Panel
The panel was tested thoroughly to ensure it displayed a picture correctly, confirming the repair was successful.
Final Testing and Results
After replacing the faulty capacitor, the system was reassembled, and the following results were observed:
The AVDD supply was restored to its normal level of 17V.
The panel resumed normal operation, and the TV displayed the picture correctly.
This successful repair restored the TV to full functionality, providing a cost-effective solution without replacing the entire panel.
Key Takeaways
Precise Diagnosis: Identifying the faulty component saves time and resources.
Use of Short Killer Method: This method effectively locates shorts within complex circuits.
Component-Level Repair: Replacing a single capacitor avoided the expense of a new panel.
Conclusion
By following the steps outlined in this guide, technicians and DIY enthusiasts can confidently diagnose and repair similar issues in LED TVs. This process not only saves money but also minimizes electronic waste. If you encounter a similar problem with your Orient Eagle 40 FHD Black, use this guide as a reference for successful troubleshooting and repair.
If you need professional help, feel free to contact our expert repair services for prompt and reliable assistance!
Highlighted Fault Area
Highlighted Fault Area
The fault area has been clearly marked in the provided photo for your convenience. Kindly examine the image to identify the specific section where the problem exists.
