My A13-LCD43TS ist not very bright, far away from the 400cd/m2 stated in the data sheet (I know that the touch panel absorbses some light but can't be that much).
Scope shows that even at 100% pwm duty the TFT LED voltage is only 20V, datasheet and switching regulator schematic says this should be 28V.
Whats wrong here?
Recently tested the brightness of the two 4.3 TFT with touch versions:
New LCD-OLinuXino-4.3TS: 174lx
Old A13-LCD43TS : 70lx