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Topic: Losing SerialLCD backlight (Read 1 time) previous topic - next topic

floresta

#15
Nov 26, 2009, 12:30 am Last Edit: Nov 26, 2009, 12:31 am by floresta Reason: 1
Grumpy:

Did you take the time to look at the datasheet for the device he is using?  Following his link it took me all of two minutes to find this: "Pulse width modulation of backlight allows direct control of backlight brightness and current consumption".

Therefore his setup does not need a serial resistor and that is why there is no place to put one.

Don

mowcius

Hmm, anyway, I am pretty sure that a resistor is not needed anywhere...

Any other ideas?

Mowcius

floresta

Quote
Any other ideas?

Just a guess... check the solder joints on the backlight connections between the two boards.  This would be pins 15 and 16 which are probably the two closest to the center of the display.  Look for 'cold' solder joints which usually look dull and grainy as opposed to bright and shiny.  You could also try a little torque between the two boards.

Don

brum

He's right you know Mike, I have exactly the same display and no resistor is required to be added.

mowcius

Quote
He's right you know Mike, I have exactly the same display and no resistor is required to be added.

Yeah I didn't think I was going mad!  ;)

I will leave it a bit and see if it wants to start working again. I don't need if for at least a week or so...

Mowcius

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