Looks normal; compare with good board, just in case.
Check the voltages from pages 69 & 70.
Be sure all is good around U7100.
Check the voltages from pages 69 & 70.
Be sure all is good around U7100.
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820-01598 No Boot
- Thread starter ClerkenwellMacs
- Start date
ClerkenwellMacs
Member
Don't have a good board to test against.
I am getting 0v on CPUCORE_FCCM
CPUCORE_FCCM - GND 123 in diode mode.
Must have measured CPUCORE_PWM1 - 2.5v twice by mistake.
What should FCCM be?
I am measuring around U7100 and will go over pages 69-70
I am getting 0v on CPUCORE_FCCM
CPUCORE_FCCM - GND 123 in diode mode.
Must have measured CPUCORE_PWM1 - 2.5v twice by mistake.
What should FCCM be?
I am measuring around U7100 and will go over pages 69-70
ClerkenwellMacs
Member
So is that the measurements for all the channels marked In or Out on U7100?
Check power pins for U7100 and integrity of surrounding components.
ClerkenwellMacs
Member
Getting the following at U7100
CPUSA_PWM - 4.7v
CPUSA_FCCM - 5.05v
Is this below the threshold for triggering U7270?
Getting my head round the order, am I right in think the below?
U7100 provides CPUSA_PWM CPUSA_FCCM which turn on U7270 which then provides PPVCCSA_S0_CPU
This comes on before the other CPU voltages?
CPUSA_PWM - 4.7v
CPUSA_FCCM - 5.05v
Is this below the threshold for triggering U7270?
Getting my head round the order, am I right in think the below?
U7100 provides CPUSA_PWM CPUSA_FCCM which turn on U7270 which then provides PPVCCSA_S0_CPU
This comes on before the other CPU voltages?
Last edited:
ClerkenwellMacs
Member
Ok got you, of course its not. I will provide what you initially asked for.
Thanks
Thanks
ClerkenwellMacs
Member
U7100
Pin Voltages - Let me know if labels make things easier and I will add them. (Positive to Ground)
1 0
2 0
3 1.4
4 2.05
5 0
6 0
7 0
8 0
9 0
10 0
11 0
12 2.49
13 2.49
14 0
15 1.55
16 2.05
17 0
18 0
19 0
20 0
21 0
22 0
23 5.07
24 0
25 2.47
26 2.46
27 2.28
28 0
29 4.57
30 0.09
31 0
32 0.09
33 0.09
34 5.05
35 4.79
36 0
37 0
38 0
39 0
40 0
41 12.52
42 5.07
43 1.03
44 0.1
45 0
46 0
47 1.62
48 1.78
Pin Voltages - Let me know if labels make things easier and I will add them. (Positive to Ground)
1 0
2 0
3 1.4
4 2.05
5 0
6 0
7 0
8 0
9 0
10 0
11 0
12 2.49
13 2.49
14 0
15 1.55
16 2.05
17 0
18 0
19 0
20 0
21 0
22 0
23 5.07
24 0
25 2.47
26 2.46
27 2.28
28 0
29 4.57
30 0.09
31 0
32 0.09
33 0.09
34 5.05
35 4.79
36 0
37 0
38 0
39 0
40 0
41 12.52
42 5.07
43 1.03
44 0.1
45 0
46 0
47 1.62
48 1.78
The chip is correctly powered up and enabled.
But is controlled through VIDx and PROGx lines as well.
A problem with T2, or PCH can block it...
But is controlled through VIDx and PROGx lines as well.
A problem with T2, or PCH can block it...
ClerkenwellMacs
Member
The T2 is involved with everything.. Great!
By the looks of it the T2 Chip/U3900 must be powered on for me to have got it into DFU mode but any of the other chips it interfaces with could then kill it and prevent a boot.
By the looks of it the T2 Chip/U3900 must be powered on for me to have got it into DFU mode but any of the other chips it interfaces with could then kill it and prevent a boot.
Last edited:
ClerkenwellMacs
Member
Getting 0.53v on PPVDDCPU_AWAKE which is below threshold of 0.625 for U7800, right track?
I was expected an output voltage, like L7702 and other coils associated to U7800.
PCH is included in the same CPU chip, but we still refer to its blocks as usual.
PCH is included in the same CPU chip, but we still refer to its blocks as usual.
ClerkenwellMacs
Member
PPVDDCPU_AWAKE 0.79v coming out of U3900 into U7800
Then nothing on big coils.
U7710 is responsible for L7702 (I believe) Conclusive but maybe not that relevant.
Pin - v
1 - 0
2 - 0
3 - 0
4 - 0
5 - 0
6 - 0
7 - 0
8 - 0
9 - 0
10 - 0
11 - 0
12 - 4.71
13 - 5.09
14 - 0
15 - 0
16 - 0
Then nothing on big coils.
U7710 is responsible for L7702 (I believe) Conclusive but maybe not that relevant.
Pin - v
1 - 0
2 - 0
3 - 0
4 - 0
5 - 0
6 - 0
7 - 0
8 - 0
9 - 0
10 - 0
11 - 0
12 - 4.71
13 - 5.09
14 - 0
15 - 0
16 - 0
ClerkenwellMacs
Member
All voltages on Page 78 concerning U7800 look good.
And it looks as if U7710 is turned on by CPU_VCCEOPIOSENSE_P and CPU_VCCEOPIOSENSE_N so wouldn't expect anything on L7702.
And it looks as if U7710 is turned on by CPU_VCCEOPIOSENSE_P and CPU_VCCEOPIOSENSE_N so wouldn't expect anything on L7702.
Last edited:
ClerkenwellMacs
Member
Is it worth me pulling off the shield to have a look at U3900 and U7800?
Don't make wrong assumptions.
U7710 expects enable signal at pin 3 and is powered at pins 13 & 14, not 12.
PPVDDCPU_AWAKE is generated by U7800 and powers up T2 chip.
Do NOT touch U3900, you cannot replace it; if is bad, board is trash.
Probably something affected by liquid on the board.
Can be T2, or CPU; not too much hope...
U7710 expects enable signal at pin 3 and is powered at pins 13 & 14, not 12.
PPVDDCPU_AWAKE is generated by U7800 and powers up T2 chip.
Do NOT touch U3900, you cannot replace it; if is bad, board is trash.
Probably something affected by liquid on the board.
Can be T2, or CPU; not too much hope...