Strange behaviour with EDM-033

[rp39]

Hello,

I'm still having some troubles getting an EDM-033 board working correctly.

WiFi/BT board was already changed and seems working correctly (no shorts and good voltages 1.8V and 3.3V on caps).

I'm getting these consumptions : 480 mA then 170 mA after 30 sec, which should be 320 mA then 10 mA. Seems that there are 160 mA going somewhere... UART codes : 80810001 Power sequence error and 80C00136 WiFi/BT device not found.

I realised that there's perhaps a missing resistor or cap on the board. Could you confirm or not?

Thank you

 

[stetofix]

It depends on the southbridge type 61GG or 69GG, if the 1 Ohm resistor under your marking is connecting the line to ground or must be placed on the both pads.

I bet you still have a problem with your WiFi chip. Check the both voltage line for the WiFi and the WiFi chip itself.

 

[rp39]

SB is 61GG.

Voltages around WiFi board seem good (1.8V and 3.3V). I didn't check the chip itself.

 

[rp39]

Should 1 Ohm resistor be present with 61GG SB ?

 

[stetofix]

At the edm-03x pcbs a 1 Ohm resistor is placed at (A) or (B) depending on the southbridge 69GG (A) or 61GG (B) on board.
At your pcb a 61GG is soldered and so position (B) is used. So I assume everything is correct in this place.

(Only for the ones, which look for a way to replace a 69GG with a cheaper 61GG: It is necessary that the data on the NOR is editied too. It is not possible to only swap a 61GG in the place of a 69GG)

I would put my focus back at the WiFi module.
Is the replacement WiFi module the right one? (J20H100/AW-XM501 or J20H104/AW-XM546)

 

[rp39]

Thanks stetofix, it is clearer.

Yes, the WiFi board is the right one (see a previous thread). I get all the good voltage values.

I have a problem on a SBV IC on one side, the other side is OK. I'm waiting to receive the parts and see if it resolve the problem.

 

[stetofix]

I'm a bit confused.
You wrote both voltages for WiFi are present but you have now a problem with one of the SBV dcdc converters?

 

[rp39]

Well, all voltages (1.8V and 3.3V) on caps near WiFi board are OK (TPS62822 IC are OK).

One SBC IC (TLV62090) is NOK.

 

[stetofix]

Can you post a picture from the board and the location from the NOK SBV on the board?

 

[rp39]

Yes, here the 2 sides