I’m looking forward to your solution. Great that you took this on. Just wondering if you two were collaborating.
LCD Replacement for the Macintosh Portable
- Thread starter Froggy814
- Start date
Thanks! That would have been awesome to collaborate with him. He seems to have a lot of knowledge about the portable compared to me, but unfortunately I don't have a good way to contact him.
On a side note, do you have a good idea on what type of cable I should use to take the odd connector apple used to make it something else becuase the 2.54 spacing header and cable will just not fit inside the portable's LCD bezel, it's too tall. I was thinking maybe I should use a regular very small/thin flat flex cable like the ones you can find on basically every electronic that connect boards together. Do you have any ideas on that?
Yes. The flat flex cable is a good idea with a small zif style connector.
Great! It'll make the adapter PCB and the controller PCB much smaller too! I just wanted to know if it was a good idea.
Off the cuff, some quick thoughts....
Decoupling capacitors must be as close to the RP2350 as possible and wired one per power pin on the chip. That advice goes for all other power pins on other parts too. Oscillator must be as close as possible to the chip and take caution with the grounding of the caps. Use an array of vias instead of one large plated hole under the RP2350. Trace clearance looks somewhat tight, suggest increasing it and using smaller passives to give you more flexibility. I didn't really look at the rest of the design - switching regulator in the corner looks a little odd, especially inductor - or validate the schematic.
My advice: consider using a pico module for v1 as that will eliminate much of the sensitive critical design work. But if you want to do the laid-down RP2350, I would recommend looking at some tested open source designs and borrowing as much as possible of the layout. Also read the design guide provided by Raspberry PI and take it as gospel, they provide a lot of excellent advice in there.
Decoupling capacitors must be as close to the RP2350 as possible and wired one per power pin on the chip. That advice goes for all other power pins on other parts too. Oscillator must be as close as possible to the chip and take caution with the grounding of the caps. Use an array of vias instead of one large plated hole under the RP2350. Trace clearance looks somewhat tight, suggest increasing it and using smaller passives to give you more flexibility. I didn't really look at the rest of the design - switching regulator in the corner looks a little odd, especially inductor - or validate the schematic.
My advice: consider using a pico module for v1 as that will eliminate much of the sensitive critical design work. But if you want to do the laid-down RP2350, I would recommend looking at some tested open source designs and borrowing as much as possible of the layout. Also read the design guide provided by Raspberry PI and take it as gospel, they provide a lot of excellent advice in there.
Thank you very much for the advice! It's hard to find sound advice, so I just followed the schematic for the Waveshare. Thank you soooooooo much!
Same here!
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