820-3435 NO SSD

[2click]

THIS BOARD DOESNT SHOW THE SSD, SO FAR I HAVE:

PP3V3_S0SW_SSD_FLT = 3.3
SSD_RESET_CONN_L = 3.3
SSD_CLKREQ_CONN_L = 3.3
SSD_PCIE_SEL_L = 0V (WHEN SSD PRESENT) 3.3 WHEN SSD REMOVED
SSD_DEVSLP = 0V
SSD_PWR_EN = 3.3
PCIE_CLK100M_SSD_N = 0V
PCIE_CLK100M_SSD_P = 0V

TRIED A DIFFERENT SSD, SAME RESULT...

 

[2informaticos]

"SSD_CLKREQ_CONN_L = 3.3"
Not good.
SSD must pull down this line when inserted.
Check connector and trace.
Post U3740 voltages.

 

[2click]

SSD_CLKREQ_CONN_L is 0v, I was checking the value with the SSD unplugged....
U3740
1 = 3.4
2 = 1.2
3 = 3.4
4 = 3.4
5 = 0
6 = 3.2
7 = 0
8 = 0

 

[2informaticos]

Values look good.
Check C3710-17, U3710/11, solders, traces, SSD connector.

 

[2click]

C3710-17 are fine
desoldered U3710/11 to see underneath, they look fine and traces where ok. put them back... still nothing... by pressing ALT I get to the boot option, but get no SSD there... I can boot from external drive but can´t see any internal hard drive...

I am using 2 samsung SSD drives, with any of those, when the board turns on, the samsung chip on the SSD gets burning hot...
on PIN 38 of J3700 I get a resistance to ground of 2.9 Ohms is that normal value?

found that L7630 diode mode value is ,026 checking that area... everything seems to be fine... I get PP1V05_S0 with no problems,
P1V05S0_PGOOD = 3.3v

 

[2informaticos]

What is the exact P3V3_S0SW_SSD voltage?

 

[2click]

I´m sorry, removed L7630
diode mode on PIN 1 = ,153 PIN 2 = ,026

P3V3_S0SW_SSD = 3.351v

 

[2informaticos]

0.026 looks to low for this model.
Compare with similar CPU...

 

[2click]

Found another 3435 board and the value is ,124 on L7630

 

[2informaticos]

Then you have a problem with PCH, which explains SSD issue too.