First, the LED display panel appears the whole screen is not bright, the reason for the dark bright
1. Visually, the 26P line and power supply module LEDs are normal between the power connector and the Unit board.
2, use Multimeter to measure the unit has no normal voltage, and then measure the power supply module voltage output is normal, if not, the Power module is judged bad.
3, measuring the power supply module voltage Low, adjusting fine tuning (power module near the light of the fine-tuning) to achieve the standard voltage.