Pda Led backlight troubleshooting diagram for ULx module below

NO

Change UL1_0x

module

Brightness\ [ control doesn't work

NO

Check

,/BACKPWM signal HIGH or\

NO

Check X001, R156, C160, V160

R155, X001

335 Hz square wave *

][ YES

NO

Check X001, R156, C160, V160

PDALEDS voltage >= 14 V (overvoltage protection limit)

NO

Change UL1_0x

module

Check LED assembly, X006 connector

NO

Change UL1_0x

module

* Note! BACKPWM signal HIGH when maximum brightness level setting.

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