Hacking Hardware Picofly - a HWFLY switch modchip

[Dee87]

Quick question: can corrupted eMMC cause Black screen?

I think my nintendo switch oled is working perfectly. Except the fact that it's on a black screen the whole time. Maybe my crap Dat adapter screwed up my eMMC.

How to test the switch to prove this? Would it be possible to install picofly and try some result? Hear that if the switch boots in rcm mode, it might be possible to manually inject hekate or rebuild the Nand via the appropriate payload.

If ur emmc is corrupted u will only get a black screnn and console won't boot at all,
U can use a usb-meter to test that.

If its working then and u have a black screen then u bent on or more of the LCD pins .

 

[Kiuxn]

Does anyone know this problem? The speed of 4kib-rate is only half of the normal speed.

 

[jmmc]

Does anyone know this problem? The speed of 4kib-rate is only half of the normal speed.

I have more or less the same results (maybe just a little bit faster) and it works without problems.

 

[Kiuxn]

I have more or less the same results (maybe just a little bit faster) and it works without problems.

So,this situation is normal?

 

[abal1000x]

.

 

[Kiuxn]

How do you know the normal speed?

I installed dozens of switches, and it's the first time I've seen such a low 4K rate.

 

[cgtchy0412]

do you have any examples of it? it is helpful when see some installation without cutting the shield

 

[bilalhassan341]

Sorry I forgot to add mosfet model. I mean for AON7506 mosfet.

Picture from @QuiTim older post. You can search online for the proper diagram and datasheet.

 

[abal1000x]

.

 

[Kiuxn]

Can you test using multimeter the value of resistance in CMD/CLK/DAT0 (The 47ohm)? Maybe the resistor broke, or short circuit, or fluxed, or something else?

An additional 47ohm was added, and the result was the same.

 

[Danook28]

An additional 47ohm was added, and the result was the same.

You soldring 2 more point *sda *scl *???

 

[abal1000x]

.

 

[Kiuxn]

When you measured using multimeter is it correct around 47ohm? or 94ohm when you add resistor after it?

yes.I changed to the new 2040-zero, and the result is still the same.

 

[abal1000x]

.

 

[Kiuxn]

Lets analyze logically.

When the data is big, the rate is high. But when the data is small, the rate is dropped. The difference between the two is, when the data is big, the request to the CMD is not busy compare to when the data is small. The request is only once or twice, then the data stream on to the Dat line. So the DAT line is okay, the CLK is okay, because when its transfer big data the rate is fast.

So i suspect the CMD line is noise, so there will be checksum, error, retry, checksum error, retry until it succeed, then when success the small packet goes to DAT line. And repeat again and again. This reduce the rate of data read from DAT line.

Here is my 1 cent suggestion:
1. Change the cable of the CMD with new one. Maybe the old cable problematic.
2. Try to clean the flux or any dirt around the CMD point.
3. In lite, the CMD point is directly goes to the emmc and cpu with some resistor paralleled to GND, you might check that resistor, it might broke.
View attachment 376193
If you use other device track it yourself in here
https://balika011.hu/switch/
4. Try to reduce little bit the resistance value. Use 33-40 ohms.

Sir, how many ohm is that resistor?

 

[Danook28]

Sir, how many ohm is that resistor?

Multimater 200 kohm read is 027.2 k ohm (resistor read) . Diode read from left 0.612 v from right is 0.364v nintendo switch lite motherbord the one green (x)

 

[cgtchy0412]

Anyone knows this resistor value?

 

[Kiuxn]

0.6,83 k ohm

No, I measured it as 4.7Kohm from another machine.

Post automatically merged: Jun 6, 2023

Anyone knows this resistor value?

View attachment 376197

100ohm

 

[Danook28]

No, I measured it as 4.7Kohm from another machine.

Post automatically merged: Jun 6, 2023

100ohm

064.9k ohm resistor read in 200 k ohm resistor read multimater.

 

[cicci084]

Hello guys, I wanted to order the resistors to use as pulldown, which value and size is recommended? What are there on hwfly flats?