How to retire Konka color TV - android - Phones Developers
I was working on a Konka HDTV, and noticed that the indicator light was on, but the screen wasn’t working. I checked the cover and found that the main voltage was only 20 volts. After disconnecting the load, the voltage returned to normal. Based on standard checks, the line tube didn't seem damaged. However, even after removing the down tube, the voltage remained very low. But when I disconnected the high-voltage package, the voltage came back to normal. Could the high-voltage package be faulty? I took a closer look at the grounding pin (4th foot) of the high-voltage package and noticed a little solder residue. I removed the package for further inspection and found that all the pins were intact—except the ABL pin. So I decided to replace the high-voltage package. I ordered a new one from Taobao and waited several days for it to arrive. Once installed, the high voltage came up, but the screen still wasn’t bright. I measured the filament voltage again, and it was normal. The +14V and -14V also seemed okay. Waited a while, but the filament still didn’t light up. Rechecked the filament voltage—it was still normal. What’s going on here?
I decided to remove the back panel and measure the resistance of the filament. It looked fine at first, but then I realized the filament was actually open-circuited. I couldn’t believe it at first. I used a high-resistance meter to check again and confirmed it was indeed broken. After talking with the user, I had no choice but to give up on the repair. It's not uncommon for filaments to break in these kinds of TVs, but I'm still wondering how it's connected to the high-voltage package. Could there have been a short between the grounding pin of the high-voltage package and the main voltage, which directly affected the filament? This is something I need to think through more carefully.
A battery connection cable are the type of wire used to connect a battery to an electronic device. The are usually made of conductive material, such as copper or aluminum, and has a pair of connectors that connect one end to the positive end of the battery and the other end to the negative end of the battery.
The main function of the battery connection cable are to transmit current and electrical energy. They direct the current from the positive end of the battery through the positive connector, and then transmits it to the electronic device through the cable. At the same time, the negative connector directs the current from the electronic device back to the negative end of the battery, forming a circuit closure.
Battery connection cables are usually of a certain length and flexibility in order to provide a flexible connection between the electronic device and the battery. It may also have a protective housing to protect the cable from damage or wear.
When choosing a battery connection cable, you need to consider factors such as current transmission requirements, battery and device connector types, and cable length and material. Proper selection and use of battery connection cables can ensure a reliable connection and power transfer between the battery and the device.
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