RI signal at 0 S9

[DiskjockeyED]

Hi guys, small question on a hashboard s9 4.21, I replaced a chip, the clock is well at 0.9 but the RI at 0v, the LDO comes out well 1.8v and 2.5v bottom pin.
All the small resistors are at the right ohm. After soldering the chip, I checked the resistors CLK30 CO30 RI30 BO30 RST30 are good in ohm. I conclude that the chip soldering is good?
Any idea where it comes from?

Thanks!

[BitMaxz]

If it's a 0 RI signal I would suggest you check the diagram to check where the RI signal is gone you can check the diagram from this link below.

- https://www.zeusbtc.com/manuals/Antminer-S9-Hash-Board-Repair-Guide.asp

Follow the yellow line for RX(RI, RO) starting from the power source until you found the broken or missing parts or it could be no connection if it doesn't have a connection make a jumper.

[DiskjockeyED]

Hi friend, I confirm that the RI signal stops on this chip (see picture) despite my multiple chip soldering I do not understand.

When you say "jumper" it would be from where to where?

https://ibb.co/ZHFH04L

[BitMaxz]

Based on your image that's not a starting point check the diagram again from the link I provided above. Start from 00 or 01 until you found where the signal has gone.
And please follow the guide from the link I provided above it should help you how to fix them.

[DiskjockeyED]

So I checked CLK (green line from 00 to 63) and RI (yellow line from 63 to chip 28 or I lose RI from here)

The chip 28 is the one I replaced as said above. But the resistances taken at the terminals of this one are correct. (CLK 0.433 CO 0.396 Ri .397 BO 0.396 RST.0316)

I have tested also core to core and I found 0,446v between each chip with next row
https://ibb.co/tQPLJBp

[Rodemi]

Does chip 29 have an output? The RI signal is output by pin 28 of the previous chip and then transmitted to the test point.

[DiskjockeyED]

You're right, the chip 29 had problem. So I remplace it one more time, and all its good now