This machine was repaired with the assistance of one of our students, who reported that the machine had no no-load voltage. This is a single-phase 220 single board IGBT machine. We first disconnected the high voltage and applied 310V. We measured the drive waveform of the tube using an oscilloscope and found none. Next, we … Read more
In automotive repair, we often encounter automotive English, which we find difficult to understand. Here are some terms for everyone to collect. Window Glass Lifter Tie Rod Assy Back Door Stay Assy Oil Pressure Sensor Water Temperature Sensor Door Lock Assy Carburetor Repair Fitting Drag Link Assy Oil Pump Fuel Pump Thermostat Sensor Complete Gasket … Read more
The LCD TV has a black screen, and the backlight is not lit. If you shine a flashlight on it, you can see that the screen is displaying images normally. This indicates that the LCD panel is not damaged, providing the necessary conditions for repair. Remove the backlight from the LCD panel. At this point, … Read more
The socket comes in two versions, both offering the same functionality. The framed version requires manual swapping of the locator frame when encountering chips of different sizes; the frame-less version directly utilizes solder balls and base positioning holes, eliminating the frame-swapping step. Super positioning without a locator frame: for chips of different sizes, positioning is … Read more
RT809H Programmer Tutorial: EMMC Offline Writing Method Apply a bit of soldering flux on one side of the EMMC, use a hot air gun to heat evenly, and remove the EMMC chip. Let the removed EMMC chip cool aside, and observe the chip pins for any solder balls. If necessary, add solder or solder balls. … Read more
Today, I am repairing a backlogged board sent by a Taobao user, the Changhong ZLS47HIS-V1 motherboard, some small capacitors are missing. The main chip is MSD6A818, powered by 12V+24V, with a Nor Flash+EMMC combination. The symptom is that the power light is on but it won’t boot. Connecting to the programmer, the printed information is … Read more
Sometimes we encounter a situation where a previously functioning USB drive or SD card suddenly shows “access denied” or “cannot read” when plugged into the computer. Often, important files are stored on the USB drive, and formatting is not an option. What should you do? Today, “Computer Matters” will teach you a trick that can … Read more
I declare that I am not a repair master, just an ordinary user! First, let me wish all the masters a Happy New Year! Now, back to the point. I have a Xiaomi 3 with a 64GB memory whose screen is broken, and it seems a waste to throw it away. Since I often browse … Read more
Author: zhangtao2: Testing equipment is an indispensable part of our daily production and life. Once these devices malfunction, how should we inspect and diagnose them? Here are some summarized experiences to share with everyone. 1. Observation Method Utilize visual, olfactory, and tactile senses. Sometimes, damaged components may change color, bubble, or show signs of burning; … Read more
In the daily management of laboratories, the diagnosis and repair of instrument equipment is an important task. With the increasing variety of equipment, the characteristics of faults are also showing a trend of diversification. This article will systematically introduce the fault diagnosis process and repair methods for instrument equipment, providing practical references for laboratory management. … Read more