The monitor has not been valuable since the computer's lcd monitor was significantly reduced. Although the monitors have been upgraded from the original 60hz to the present 165hz, i haven't fixed them in two or three years. Because, unlike in the past, a liquid crystal monitor is $23,000, broken, needed a new one or two hundred fixes。
And now? Few people are willing to repair the monitors because they sell them directly to second-hand accessories, buy a new one or pay for better displays。
Yesterday, a liquid crystal monitor from philip, 24 inches, 21 years old, unbridled design, was quite new. Since it was for a unit client, it was only three years before the end of the life, and therefore required maintenance。
The failure of the monitor was the installation of a power plug, the pressing of the monitor's power switch, the failure of the light and the absence of images. A more professional description should be called “nil”, without a sound。
Although the monitor is also borderless, it still uses panels and does not simply glue the liquid crystal screen to the shell, so it still needs to be removed from the front and back shell during maintenance. Although the shells were not fixed using screws, it was hard to untie them, which were so close that it had to be broken with great effort。
Both the tv and the monitor are now highly integrated, and the interior is typically a main panel (power signal processing n-one), a keyboard, a liquid crystal panel。
The monitor did not use an external power source, and the interior used a triad of the main panel, the power panel, the main control panel and the heliboard. When it was removed, it first looked at the entire power plate on the front and back, and did not see any visible cases of burning and blacking of carbide, nor did it see a drum bag in the filtering cap。
In the case of television or monitor “three-nil” failure, the first thing to check is the power source, which is the most vulnerable. The early lcds generally output two sets of voltages, +5v and +12v, and now the led monitors are more energy-efficient, the switch power technology has improved and the switch power chip and the power pipe have been integrated。
In normal thinking, the insurance should first be checked, then the 400v filtering cap should be measured, then the power pipe and the power ic should be checked, and finally the secondary shortki diode. Experience suggests that now, as long as there is no black fever on the switch, direct inspection of the secondary shortki diode, the whole-stream diode, can easily penetrate short circuits, leaving the whole machine without light or sound。
Although the monitor was sub-used with two 5100c stickers of shortki diodes and used together, one of them was hit through a short circuit, leading to the switch on the power source secondary short circuit and no voltage output. That's what it looks like。
I really don't have one on my hands, but i'm afraid i'll have enough power to burn it for a little longer. So both stickers were removed and replaced with two columns of sr51 diodes. Because space allows, there is no need for holes in the pcb plate (which is a double plate) to cut open the green welding layer of the copper plating and then go to tin and weld two sr51 diodes。
When the temperature of the welding points is normal, the electrons measure the sub-voltage of the sr51 end voltage at 17. 87v. Remeasured signal processing, 5v, 3. 3v, 1. 0v voltage is also available。
Placing the panels, adding the tester, displays are normal and blue, and logo appears, indicating that the display failure has been resolved. It will then be necessary to install the monitors, connect the signals, turn them on and test them for an hour。
The maintenance of monitors such as this, although not expensive, is efficient and will allow 30 minutes for the display to be removed and repaired and to be installed and tested with the electric switch. It's just this little sparrow is too little, too little..。
When you think of 10 years, when you're going to fix the crt monitor, you're going to pay $30 for one, you're going to change the pressure pack and you're going to charge $60, $70, and you're going to build 20, 30 monitors and line up. At that time, people didn't earn much, it was $5,600 a month, but it took two or three thousand lcd monitors and hundreds of crt monitors, so people would pay for it。
Now there are fewer people using computers, and those who are able to play computer games are professionals who are looking for performance and comfort and are demanding monitors, so they're broken and replaced。
