Re: HP ESG3000A backlight issue revisited....your thoughts please?
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Here is brightness driver... Milan
Hi Milan,
I think that schematic is for the actual LCD contrast on the screen itself.
What I am battling with is the LCD BACKLIGHT driver which had a very thin fluorescent tube (CCFL) driven by a high voltage inverter module (as shown in my picture).
Its the 'dimming' control voltage that seems to be causing me grief as the YouTube chap states he measured 0.2V d.c. to 4.7V d.c. from dim to full brightness whereas I measure (minus) 0.24V to (minus) 1.33V
for the same level of control.
My question is how does one sig-gen seem to have a positive control voltage range whilst mine is a negative going control signal when the CCFL inverter module is the same in both instruments.
And can anyone explain this difference PLEASE?
Dave
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