Home > Knowledge > Content
Simple LED display screen repair
- Dec 28, 2016 -

1, the whole Board off: the Board no plugged input cable invert input output reverse; the power supply polarity reversed. 2, the Panel does not light transmission to normal: the protection circuit is damaged solution may 4th and 5th foot 74HC138 feet short. 3, three rows one row is not lit: 4953 damaged (one damaged). 4, every other line light line: a signal problem, please check for virtual welding 74HC245 74HC138; 74HC138 1th pin voltage with a multimeter is equal to 2.5V, if you have replaced 74HC138 carefully Flammulina velutipes with ICA signal pathway. 5, a couple of rows on two rows: b signal issues, please check for virtual welding 74HC245 74HC138; 74HC138 2nd pin voltage with a multimeter is equal to 2.5V, if you have replaced 74HC138 carefully Flammulina velutipes with ICA signal pathway. "Giant screens"

Related Products


在线客服