No back light 5" LCD

[dhusolo]

I have a 5" LCD with panel due and the back light isn't working. The touch screen works, just no back light. I found the resistor for R6 is missing. I have another LCD and when I measured the resistance it was 3.3. Could I get away with soldering another resistor in or is there another work around to get the back light to work.

[T3P3Tony]

if thats the same 5inch screen that i have then R6 is fitted so you could try refitting it.

[zapta]

EDIT: this is probably the wrong schematic. Please ignore.

According to this schematic R6 should be a short.

https://raw.githubusercontent.com/dc42/PanelDue/master/PCB/V3.0/PaneDue-3.0-schematic.png

https://github.com/dc42/PanelDue/blob/master/PCB/V3.0/PaneDue-3.0-schematic.png

[T3P3Tony]

Thats the schematic for the Paneldue control board, not the LCD screen (which is from a third party). Atleast thats what it looks like - that does not look like the PanelDue 5i.

[dhusolo]

@zapta so does that mean i can just solder a bridge to those 2 pads?

[dhusolo]

@t3p3tony what do you mean by refitting? I don't have the resistor anymore

[T3P3Tony]

@dhusolo good point - fitting a new one!

[zapta]

@t3p3tony said in No back light 5" LCD:

that does not look like the PanelDue 5i.

Yes, I think you are right. The original picture here is of the LCD board (?), not the plug-in controller.

[zapta]

@dhusolo said in No back light 5" LCD:

@zapta so does that mean i can just solder a bridge to those 2 pads?

I may made a mistake. I assumed that the picture you sent is of the plugin controller but it may be in fact a picture of the LCD board.

[dhusolo]

@zapta it's of the actual LCD

[dc42]

Yes that resistor is part of the backlight circuit. Its value on my 5" TFT screen is 2R7.

[dhusolo]

@dc42 Thanks! so that means it's a 2.7 ohm resistor.

Figures I don't have any 2R7 surface mount resistors. I'm assuming they don't have to be surface mount resistors and the more common metal film would work

[A Former User]

@dhusolo said in No back light 5" LCD:

more common metal film would work

sure, if you can mount it, it'll work just fine. regular through hole will also have a greater power rating, 1/4w for through hole vs 1/8w or less for the smd