Chosen Solution
Hello everyone I have a rechargable speaker, it has 2 input ports for charging. One of them is 6V DC, and another is 220V AC. The 220V one is only for charge which means I shouldn’t turn the speaker on when it’s connected to 220V, I should let its battery charge and disconnect from 220V then I can turn it on. But it’s okay to turn on the speaker while it’s connected to 6V DC. But once it was in 220V, i turned it on, and then it got damaged, it turns on now and can play radio or mp3 musics on a flash disk, but the sound is not clear and is so low, even when I connect headphones to it, the sound from headphones isn’t clear and is so low again. But its “speaker” part is okay as I tested it with another radio, and it was loud and clear. So something in its circuit is dead I think but I don’t know how to figure out which part or parts. I post some pictures of it. Thanks in advance for any help. I have uploaded pictures here but I think they are not visible!! I put links to the images: 1: https://i.imgur.com/CmhTzwf.jpg 2: https://i.imgur.com/FYusH2c.jpg 3: https://i.imgur.com/Kg40AsX.jpg 4: https://i.imgur.com/OL5uFm4.jpg 5: https://i.imgur.com/zCxneUV.jpg
The IC labeled D2822ML is the audio amplifier, and is likely your problem. This needs to be replaced with a new one. What happens is the power supply is supplying a high voltage to the battery to charge it, too high for components like this IC, which can only handle 9 volts. There are many manufacturers of this IC, utilizing the part number 2822.
