how to repair LG32ln4900 no sound issue

LG LED TV (Model: 32LN4900) No Sound Issue – Diagnosis & Repair Guide

An LG LED TV (Model: 32LN4900) was brought into the workshop for repair. Although the picture was displaying correctly, there was no sound output. To address the issue, a systematic diagnostic process was followed, and the details of the procedure are outlined below.

Fault Finding

1. Testing the Speakers:
The first step was to test the TV’s speakers to ensure that the sound problem was not caused by them. The tests confirmed that the speakers were functioning properly.

2. Inspection of the Audio Amplifier Circuit:
After verifying the speakers were in good condition, a thorough analysis of the audio amplifier circuit was performed. During this process, it was observed that:

The circuit incorporated an audio amplifier IC, NTP7513.

This IC was receiving a 24V Vcc supply.

All other related components were in proper working condition.

However, the IC was heating up excessively, which indicated an internal malfunction.

3. Fault Finding Conclusion:
Based on these observations, it was concluded that the problem was primarily due to a fault in the audio amplifier IC NTP7513 (IC Chase Number: IC301).
Faulty Component Number: NTP7513

Fault Finding Image Description

An image documenting the fault-finding process is attached with this article. The image clearly highlights the fault area on the audio amplifier circuit where the issue was evident. Additionally, the faulty component (NTP7513) and other pertinent details are marked, providing clear guidance on the diagnosis. This visual aid serves as a valuable reference for future troubleshooting and repair tasks.

Repair Process

Replacement of the Faulty IC:
After confirming the fault, the defective audio amplifier IC was removed and replaced with a new, correctly functioning component.

TV Testing

Following the installation of the new IC, the TV was tested again. The post-repair testing confirmed that the sound issue was completely resolved and that the TV’s audio performance was restored to optimal levels.

Customer Guidance

If you experience issues with sound or any other functions in your LG LED TV or other electronic devices, please refrain from attempting to diagnose the problem yourself. Our experienced technicians utilize state-of-the-art diagnostic tools and technical expertise to accurately pinpoint issues and provide prompt solutions. We advise that, at the first sign of any malfunction, you contact our service center immediately so that your device can be repaired quickly and safely. Our primary goal is to deliver top-quality service, maintain your trust, and enhance the performance of your electronic appliances.

Conclusion

This repair experience underscores the importance of a methodical approach to diagnostics and the timely replacement of faulty components. The no-sound issue in the LG LED TV (Model: 32LN4900) was traced back to a malfunction in the audio amplifier IC NTP7513, which was successfully resolved by replacing the component.

Final Thoughts

In conclusion, even a minor component failure can significantly impact the overall performance of your device. Accurate fault finding and effective repair procedures are essential to restore and maintain your electronic equipment’s performance. This case serves as a valuable reminder for prompt professional intervention to ensure continued reliability and efficiency.

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