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Xinyuan-LilyGO / LilyGo-EPD47

GNU General Public License v3.0
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Screen goes blank when battery is connected #47

Open hacksics opened 3 years ago

hacksics commented 3 years ago

I have a strange issue. When I connect the 18650 battery, screen goes blank however blue LED is on. I've tested if ESP32 getting 3.3v and confirmed that its getting 3.3v.

What could be the issue?

Also can I solder wires to PH connector and use instead? Does anyone know they use different circuitry ?

LilyGO commented 2 years ago

Hello, have you solved your issue?

benkokes commented 2 years ago

I also have this problem. The unit works when plugged into USB, but if you install a 18650 battery, the screen slowly goes blank. There are a few missing passive components next to the + terminal, could that be the issue? I have not removed any components from this board.

Schnabulation commented 2 years ago

I have the same problem. I can confirm the battery is of type 18650 and fully charged. How can I fix that?

G6EJD commented 2 years ago

Are you sure the battery is making contact with the battery terminals you need to bend them in quite some way to ensure contact, especially if you have the flat top 18650 type of battery.

Schnabulation commented 2 years ago

Thanks for the tip. Yes, I have bend the terminals pretty far so that the battery makes contact. I can also verify that all ESP32 functions (such as GPIO ports, WiFi, etc.) work flawlessly - it's only the display that does not work.

EDIT: This might sound very stupid but I have again tried to bend the terminals so that it definitely makes contact with the battery and now the display works flawlessly. I don't know if previously it was just not contacting enough so that it only had enough power for the processor but not the display - but it's working for me now.

daernsinstantfortress commented 1 year ago

@Schnabulation Did this issue ever return for you? I have two of these boards, and both are now displaying the same symptoms - blank display when battery inserted (with or without external power), but work fine when just powered from USB. I've played with the battery terminals, but to no avail.

Schnabulation commented 1 year ago

Actually this was fixed by bending the terminals and never returned.

daernsinstantfortress commented 1 year ago

Actually this was fixed by bending the terminals and never returned.

@Schnabulation Thanks (and I've just realised that you also responded earlier on the other thread too!)

Today, I soldered on an 18650 holder to the battery terminals and, lo and behold, it all works fine now:

image

I can't work out whether the battery clips are just not very good conductors, or the tension of the battery is upsetting something else on the board, but desoldering them and replacing with this is an easy, quick fix for me and if it turns out reliable (as it seems to be now), then it'll do for me!