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BW screen getting warm

Posted: Wed Mar 14, 2018 3:22 pm
by Wailer
Hello fellow modders,

I noticed that my bw display is getting warm after some time.
The heat i believe is emitted by the pcb, its not the graphics chip but the capacitors surrounding the voltage regulator.
Has anyone noticed this, or is this normal.

My screen runs on 5v with no modding needed.

Re: BW screen getting warm

Posted: Thu Mar 15, 2018 7:39 am
by tinkerBOY
The BW screen I used on my first build gets hot to the touch on the graphics chip but I play with it almost everyday without any problem. Although it works with 5v out of the box I still modified it to directly work with 5v. Much more power efficient this way.

Re: BW screen getting warm

Posted: Thu Mar 15, 2018 10:30 am
by Wailer
Ok, thanks for the info.
My build isn't completely finished so maybe I'll remove the voltage regulator anyway.
It's good to hear that heat development isn't causing any problems.

Re: BW screen getting warm

Posted: Wed Mar 28, 2018 1:55 pm
by Hex
Hey can you post pics of your display pcb ?

Re: BW screen getting warm

Posted: Wed Apr 04, 2018 12:57 am
by Wailer
Hex wrote:
Wed Mar 28, 2018 1:55 pm
Hey can you post pics of your display pcb ?
20180217_150800.jpg
20180217_150800.jpg (4.99 MiB) Viewed 2588 times

Re: BW screen getting warm

Posted: Wed Apr 04, 2018 9:27 pm
by Hex
See the empty holes on the right side? The top most is 3.3v and bellow that is GND. That should power your lcd nicely. Use that and the composite input (3 wires in total) for the LCD. That should do

Re: BW screen getting warm

Posted: Fri Apr 20, 2018 12:14 am
by Wailer
Hex wrote:
Wed Apr 04, 2018 9:27 pm
See the empty holes on the right side? The top most is 3.3v and bellow that is GND. That should power your lcd nicely. Use that and the composite input (3 wires in total) for the LCD. That should do
Good suggestion, hadn't thought of that I will give it a try.
If i understand this correctly this should bypass the on board regulator, and that (at least the capacitors surrounding the regulator) is the main source of the heat development.
👍

Re: BW screen getting warm

Posted: Fri Apr 20, 2018 1:20 am
by Wailer
Here's another pic of the back of the pcb.
To bad there's no further (silkscreen) info on the four extra connector's.
But there are a lot of test-points worth checking out...
back.jpg
back.jpg (630.58 KiB) Viewed 2472 times

Re: BW screen getting warm

Posted: Mon Apr 23, 2018 5:19 pm
by Hex
You can use the 5v test point for 5v or use the 3.3v i suggested. The IC runs on 3.3v and the entire board works on 3.3v so it should not be a problem. This is useful if powering directly from 3.7v battery without a boost circuit.