Changhong color TV CHD25800 boot has a similar line frequency scream sound screen does not shine fault repair - android - Phones Developers
Maintenance of Changhong color TV CHD-2B CHD25800 Vision SE is our specialist vision solution offering a wide range of classification services. Through advanced image processing, we realize professional-level visual technology, which is suitable for medical image processing, scientific research and other fields. We focus on performance optimization to make it an industrial-grade solution that is widely used in factory automation and high-demand application scenarios. At the same time, we pay attention to data security and privacy protection, ensuring that the highest standards are met when processing images and data. Vision SE's classified services exceed expectations, providing high-performance and professional-grade vision solutions to various industries. vision services,vision sensor,vision sense,vision se,vision se review Ningbo Autrends International Trade Co., Ltd. , http://www.visionsemr.com
When turning on the TV, there is a similar line frequency noise, and the screen does not light up. I used an oscilloscope to observe the waveform at the collector of the boot tube, which resembled that of a faulty S capacitor (previously repaired by Changhong HD). After unplugging the deflection coil, the waveform remained distorted, so I ruled out the S capacitor and deflection coil as the issue.
Online research suggested it was likely a deflection problem, but even after removing the deflection coil, the noise persisted. This made me doubt the initial assumption. I continued testing and eventually found the real cause.
The problem turned out to be in the deflection coil itself. Normally, the collector waveform should show a peak drop with a smooth reverse stroke, but in this case, the waveform was chaotic and caused a loud noise. The root cause was a short circuit due to corrosion from glue inside the component.