Picofly fly away to heaven for 3 Oled Switch "Zelda ToK" .. [Help Plz!]

[crazycrash_hum]

HI everybody

I Tried 3 time to make the hardmod picofly on switch butttt... i've got 3 time the same problem (with LED indication), This one : *== No eMMC CMD1 request (poor wiring, or dead CPU)

Can you help me because i don't understand my problem...

Let's make a resume of the situation :
The components :
-I use this Wire ( not Kynar wire maybe it's the problem ?) : 38AWG for the CLK point, 32AWG for the 3.3v, and 36AWG for the other points (GND, Dat0, CMD, RST, CPU)

-RPZero : i made a full install software in first step with v2.73 fimrware uf2

-I use 47 R resistances and and I checked with the multimeter if the 3 resistances was indeed 47 ohm. So this it's Ok

- For the 2 First Switch i used this Mofsets but for the last one i use Adaptator V2 like this one :

- I use this Dat0 adpatator

Now we can pass to the soldering points :
So we got 7 points of soldering

-GND :

the GND is perfectly soldered

-3.3v :

the 3.3v is perfectly soldered

- The Dat0 :

for this i use the multimeter in diode mode to get this value (between 0.5 and 0.8), what do you think about that ?

-CMD :

There is a thing to use the multimeter and check that is ok ?

- CLK :

it was a tricky one but soldering is done.
There is a way to check with the multimeter if it's ok ?

- RST :

the RST is perfectly soldered

- CPU :

This was a hard port because of the tiny soldering but i made a very good soldering so ...
there is a way to check that with multimeter

So the CMD and the CLK or the CPU need to be check maybe with multimeter if you have any tips ?


I hope you can find any solutions to this problem, the CPU is dead or anything with this LED Patern ?

any help will be appreciated

thank you

 

[randy_w]

Your CLK soldering looks a bit suspicious, the large blob of solder could have shorted it to ground if you accidentally scratched the soldering mask on surrounding ground plane, and the pointy solder ball could touch the metal shield and short it to ground.

But first of all you should check all points' diode reading, they should be:
A,C,D: 0.5-0.8V
B: 1-3V, some multimeters may show as open circuit
SoC SP1/SP2 capacitors: one side is ground (0V), the other side's reading is very low (0.01-0.02V iirc, but NOT short to ground).

Also, try to disconnect the chip and see if your switch boots up normally. If not then you might have damaged your console.

 

[crazycrash_hum]

A very big thank you !

For you the CLK may touch this ? What is circled in blue?

I don't understand your second paragraph,
What is this point ACD ? And B ?

With the ship Inside, the oled screen doesn't light up..

Thank you for your help

 

[randy_w]

What is this point ACD ? And B ?

A - CMD
B - RST
C - DAT0
D - CLK

ABCD are silkscreen marks on hwfly chips.

For you the CLK may touch this ? What is circled in blue?

The metal shield is ground. They should NOT touch each other. Tidy up your CLK point, remove excessive solder and add more flux to prevent forming pointy solder ball. Cover it with some green UV solder mask once you verified the connection.

 

[crazycrash_hum]

A - CMD
B - RST
C - DAT0
D - CLK

ABCD are silkscreen marks on hwfly chips.


The metal shield is ground. They should NOT touch each other. Tidy up your CLK point, remove excessive solder and add more flux to prevent forming pointy solder ball. Cover it with some green UV solder mask once you verified the connection.

Thank you, i do a check when i will be able to !
and i return here to inform you

 

[deeps]

you can just check your clk against gnd before removing. if it reads 0 it needs to be fixed, otherwise not

 

[fragged]

I see no problem here...

 

[crazycrash_hum]

the clk should be at 0,5V ? because i check it and i am at 0,004V

So, this is the problem ?

@randy_w

Post automatically merged: Jul 8, 2023

Big thank you for this :

you should check all points' diode reading, they should be:
CMD,DAT0,CLK: 0.5-0.8V
RST: 1-3V, some multimeters may show as open circuit
SoC SP1/SP2 capacitors: one side is ground (0V), the other side's reading is very low [0,866v) (0.01-0.02V iirc, but NOT short to ground).

 

[randy_w]

the clk should be at 0,5V ? beacause i check it and i am at 0,004V

So, this is the problem ?

@randy_w

Post automatically merged: Jul 8, 2023

Big thank you for this :

you should check all points' diode reading, they should be:
CMD,DAT0,CLK: 0.5-0.8V
RST: 1-3V, some multimeters may show as open circuit
SoC SP1/SP2 capacitors: one side is ground (0V), the other side's reading is very low [0,866v) (0.01-0.02V iirc, but NOT short to ground).

Yes, you shorted it to ground. Remove all excessive solder and redo it. You may need to use some solder mask or kapton tape to cover ground plane around it if you exposed them.

 

[crazycrash_hum]

I desolder everything and the console does not boot up.
So i think there is anywhere an item that has burned out..