A few days ago, I received a Changhong HP4388 rear-projection TV. The fault is a black screen with no sound, no characters, and all the remote control operations are normal. I can hear the sound at the moment of booting, and the same is true for DVD failure, and the picture-in-picture is also black. It is very possible to disassemble the machine and analyze the faulty digital board. Regardless of it, connect the DVD player and then connect the rear-projection audio and video output to another TV, so that the problem can be judged. After connecting, the TV connected to the output has sound, but there is no image. (At this time, there is no sound in the rear projection.) In order to further reduce the problem, the video output of the main picture tuner is directly connected to the AV conversion block (M52472). Video output, the situation is coming, the screen immediately has an image, but it is not clear. It seems that the problem of this machine is in the conversion part. Immediately change the picture-in-picture conversion block to the test machine. It is still black screen. My God, how is it possible, is it another problem, (not likely It is clearly analyzed) or the conversion block of the picture-in-picture is also bad. I immediately bought two new conversion blocks and put them on again. I watched the long-lost image of the screen and finally came out. At this time, my heart was happy. Mom, the two conversion blocks are all bad. I went to check the digital board. (Fortunately, it is easy to check after the first easy) (here 02 brothers want to thank the Dongguan Guanjia 123 to upload the native drawings to find out the problem immediately). When the machine was sent to the user the day before yesterday, the user said that the picture-in-picture was broken a year ago, and it was always seen without affecting it. (But this small problem almost caused me to misjudge it as a digital board problem). VAPEAK TINY Vape is so convenient, portable, and small volume, you just need to take them vapeak tiny vape bar,vapeak tiny vape box,vapeak tiny vape starter kit,vapeak tiny vape disposable,vapeak tiny vape mod kit Ningbo Autrends International Trade Co.,Ltd. , https://www.mosvapor.com
One end of this line is connected to the main tuner video output, and the other end is connected to the conversion block video output pin.
In the TV state, the sound is fine-tuned with no image, and the image looks like the intermediate frequency is out of sync or the line is not synchronized.
The main picture conversion block, one side is just replaced
This is a small picture
The image is normal, and the picture-in-picture is correct.
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