1-bit mode on Hekate - Please Help

[popgenie]

I’m new to being a DIY electrician and I’m trying to fix the 1-bit mode issue on Hekate for my son's switch. I tried to troubleshoot using a previous thread that mentioned testing the FPC connector with a multimeter. I found that the DAT2 pin is connected to GND. Does this mean the FPC connector is faulty and needs to be replaced, or could there be another reason for the DAT2 pin being shorted?

 

[Hayato213]

Data2 isn't connected to ground, it is connected to the black label point on the left.

 

[popgenie]

Yes, it connected to the black label point on the left, but it also connected to the GND. I tried the other SNS, DAT0, DAT3, DAT1, CLK and CMD which none of them connected to the GND. I'm trying to figure out why this happened and looking for a fix, thanks.

 

[thesjaakspoiler]

It does explain why the sd card goes into 1 bit mode.
If DAT2 isn't working, there is some safety mechanism that automatically goes into 1 bit mode.

Is there no damage on the SD card board or something conducting inside the SD card slot?
Is the connector itself also not damaged with the DAT2 pin having been bent to the GND that is next to it?
It could be faulty connector or some dirt under the FPC connector that started conducting.
But removing and reseating this connector requires a hot air station and the skills/experience to do that.

 

[rull_bull]

Are you using a modchip or RCM??

If you have a modchip, wich one?
Resistor value for cmd, clk, d0?

If RCM, tried to replace sd connection board?

 

[popgenie]

Thanks for everyone's help.

• It is RCM MOD.
• How to measure the resistor value for cmd, clk, d0?
• I tired to replace a new SD connection board, it still have the same issue.
• The FPC connector looks clean and no pins are loosing. From the picture, I measured both blue point connected to GND.

 

[jkyoho]

I have measured Mega ohm range in resistance mode checking on dat2, and 0.592 diode reading. Not on ground for sure

 

[Hayato213]

Thanks for everyone's help.

• It is RCM MOD.
• How to measure the resistor value for cmd, clk, d0?
• I tired to replace a new SD connection board, it still have the same issue.
• The FPC connector looks clean and no pins are loosing. From the picture, I measured both blue point connected to GND.

View attachment 449316

The one your circled isn't connected to ground.

 

[popgenie]

The one your circled isn't connected to ground.

You are right ! But now they connected to ground, that's the issue.

 

[jkyoho]

flip your board and check the other side

 

[impeeza]

You should not test a point "connected to ground" on a assembled board because you are not measuring a connection to ground instead you are reading internal components of different chips and other devices.

be sure all left test points had continuity with one AND ONLY ONE point on the connector, then test your SD Card reader and look if any pin is missing or not connected to the correspondant pin on the reader.

 

[popgenie]

Thanks for everyone’s help again. It has been fixed now! I took out the board and measured the FPC connector. The DAT2 is no longer connected to the ground. I’m not sure what caused this, but I have the following observations from when I took the main board out:

1. One of the antennas was not connected and was hanging under the board.
   
   
2. There is a tiny amount of silicon on the back of the board right at the position of the FPC connector.
3. Another antenna’s wire skin was damaged by less than 1mm, exposing the wire. So, I put a small amount of silicon sealant to cover it.