RP2040 Flex Pad came off is it B,C or somewhere else

BrokenSolder · Apr 24, 2024

Hello,
I hope someone can help, I just received the flex for my oled, i've soldered other points on fine, however with very little heat one of the pads came off, its the one that's supposed to connect to the resistor under the pad labelled D on the flex from the guides, I don't know if this picture will help.

If i can avoid it I would prefer to keep the flex rather than waiting for a replacement, does anyone know if there is any point on the flex i can jumper this resistor to please?

I'm trying to avoid removing the flex and scraping it to see where it goes., if it goes anywhere?

Really grateful for anyone's help

Post automatically merged: Apr 24, 2024

jkyoho · Apr 24, 2024

as long as D point has correct diode reading you are fine. The pad under D label on that resistor is ground point, and can be ignore

BrokenSolder · Apr 24, 2024

jkyoho said:
as long as D point has correct diode reading you are fine. The pad under D label on that resistor is ground point, and can be ignore

Thank you

urherenow · Apr 24, 2024

most pro installers don't ever bother with that flex cable to begin with. It just sucks. CPU flex is the only important one. I think I've seen 2 installers use it 1 time, just for the video. That's about it.

deeps · Apr 24, 2024

urherenow said:
most pro installers don't ever bother with that flex cable to begin with. It just sucks. CPU flex is the only important one. I think I've seen 2 installers use it 1 time, just for the video. That's about it.

nah we don't bother with cpu flex either

BrokenSolder · Apr 24, 2024

Lol thank you, I did all the rest it was pretty straightforward just that pad fell off with me barely even touching it, watched all the videos, tried to read all the guides just to see if anyone mentioned that point, was going to start scraping it to see if I could expose where it went, glad I asked first

urherenow · Apr 24, 2024

deeps said:
nah we don't bother with cpu flex either

well, it's used in most of the videos I've seen (well... for non-Pi chips, I guess). Saves from having to manually add mosfets...

deeps · Apr 24, 2024

urherenow said:
well, it's used in most of the videos I've seen (well... for non-Pi chips, I guess). Saves from having to manually add mosfets...

yeah, I'm just flexing (huehue). No reason to not use the cpu flexes if you have them. The other flexes cause more issues than they solve though.

BrokenSolder · Apr 25, 2024

deeps said:
yeah, I'm just flexing (huehue). No reason to not use the cpu flexes if you have them. The other flexes cause more issues than they solve though.

It would have just been 2 easier jumpers if I didn't use this flex then and maybe something for ground?

deeps · Apr 25, 2024

BrokenSolder said:
It would have just been 2 easier jumpers if I didn't use this flex then and maybe something for ground?

there would be 6 wires to the chip:

- C (dat0)
- A (cmd)
- D (clk)
- B (rst)
- 3v3
- gnd

plus the cpu flex

BrokenSolder · Apr 27, 2024

deeps said:
there would be 6 wires to the chip:

- C (dat0)
- A (cmd)
- D (clk)
- B (rst)
- 3v3
- gnd

plus the cpu flex

So on this flex though it would be easier to just add a small jumper from the trace another from A and a jumper for power and then jump the other flex direct to the board instead of this flex??

RP2040 Flex Pad came off is it B,C or somewhere else

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