LCD or PLASMA 2009
Model
37
Power Supply Backlight Drive Signal Effects
Power Supply Backlight Drive Signal Effects
VBR-B
PWM-DIM manipulates
the ballast drive IC.
VBR-A
BR1 (A-DIM) is not used.
Waveform taken using loose coupling. Clip the
probe to one of the Backlight wires. Use
caution, there is 1.2Kv in the wire.
Slow scope setting to 2.4mSec to see the effects
of PWM on the waveform.
The PWM amount can cause the frequency to be
measured differently.
