Now, most of the monitors are liquid crystal displays, so there's a very intuitive change in the presentation of the images and in the improvement of the graphics, not only in the data on contrasts, reduction, etc., but also in performance parameters and the physical experience of users. And on the board of the lcd, which is an important player, it is believed that many consumers know very little about it, so let's come up with some information today about the lcd panel。
I. Introduction to lcd panels
Lcdtv is designed for a 22-37 inch lcdonitor lcd monitor, lcdtv lcdtv-based television. Single (+24v) double (+24v,+12v)。
Ii. Characteristics of the lcd power panel
The input voltage of 100-265 vacs is characterized by low power loss, low size, efficiency, job stability and high reliability. There were protections such as overflows, short circuits, etc。
Iii. Attention to the use of lcd panels
P-power is a two-way output and is not suitable for single-group voltage; to ensure stable power operation and useful life. Please don't overutilise
Pa-6615b for three sets of voltage output: cn2-1, 2 = 12 vcn2-9, 10 = 5 vcn3-5, 6, 7, 8 = 24v > thunderstorm day is best not used or damaged
Iv. Lcd panel maintenance
Symptoms: powerboard output voltage is normal, but press switch
Let's start in the first order
There's an anomaly in the ocular plate, there's an anomaly in the electronized hand touchboard, see if there's an anomaly in the temperature, sometimes the processing chip has a bad temperature, and it's just a touch
Then i used to check all the power on the drive。
Since power panel output is usually only 12v and 5v, there are several dc/dc stabilizers on the drive to convert the voltage required for the drive。
(a small number of machine-type power panels will also output the power of 3. 3v, 2. 5v etc. To the drive)
In general, 5v, 3. 3v, 2. 5v, 1. 8v etc. Measured the input and output voltage of several steady-pressure chips, which, if caused by power problems, quickly found a failure point。
If all the voltagers are normal, go ahead and find out
The power supply is normal, so all the buttons on the keyboard should already have the voltage, and then we'll use the one-size-fits-all watch to measure whether when you press the switch, the voltage on the key has been pulled down to 0v, and if not, the key is broken, and the other button will fix the failure
If there is a switch voltage jump, then the switch button is ruled out, the check continues, the power is available, and then the clock required for the chip work is checked. (different crystal vibrations are required for different processing chips)
It's best to have an oscillator to see the wave shape。
The clocks needed to work on the mcu chip are also available, and the conditions required to re-examine the chip work are complex, as the chip PDF is difficult to find and, even if found, may vary from manufacturer to manufacturer and take time to define。
This is the case of the lcd power panel, the use of attention, and the analysis of characteristics and maintenance examples. In addition to presenting the performance parameters of the lcd power panel from a professional perspective and the components of the evaluation, we understand that it is a high-power, small-sized, efficient component, and also through frequent malfunctions on it -- the power plate output voltage is normal, but a detailed analysis was performed and a specific treatment solution was given。
