LCD TV screen flower screen judgment method - android - Phones Developers

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

MOS power IC full range

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

The so-called flower screen, it is common for the screen to have an image, but the image is covered with a bit shape, sheet shape, mosaic interference. The parts that cause such faults are: TTL or LVDS signal forming part of logic board, LCD screen, computer board (the small screen is mostly TTL signal, the big screen is mostly LVDS signal, hereinafter referred to as LVDS signal). When troubleshooting this fault, first distinguish whether the fault is in the logic board and LCD section, or in the LVDS signal section of the computer board. Open the user menu, observe the image flower screen, and see if the user menu is accompanied by the malfunction of the flower screen. If the user menu is normal, only the image appears to be blooming. The problem is generally on the interlaced to progressive line of the computer board and the scaler processing chip circuit. Generally, it can be repaired by soldering. (For the chip in the BGA package form, we can press the chip, and observe whether there is a significant change in the screen screen phenomenon. If the change is obvious, it is usually caused by the solder joint of the chip, and the special tool, such as the heat gun, is given to the IC. Heating, re-welding the bad contact foot). If the user menu is opened and the on-screen menu also has a flower screen phenomenon, it can only be judged by substituting the computer board and the logic board. The screen has a faulty screen and an irregular screen, which is often caused by poor contact of the LVDS patch cord. Clean the cable. The faulty rate on the logic board is mostly due to the damage of the power circuit on the logic board. The data and components are scarce. At this stage, only the whole block can be replaced. If there is no obvious short circuit on the logic board, the insurance can be replaced. Try and see if the fault is eliminated.