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Re: X550jx black screen but cpu heating up
You have board view
Check this signal suspwrdnack is connected to which capacitor or which nodes
Take snapshot and postComment
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Re: X550jx black screen but cpu heating up
Check resistance value of 10 kilo ohm resistor
In ohm rangeComment
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Re: X550jx black screen but cpu heating up
Hmm interesting
At step 15 rsmrst# when goes up 3.3v pch_susack# goes up at step 16 and at step 17
suspowerdnack goes up after 200msec delay so
First check PCH_susack# goes up and it is constant
For few seconds or drops
Second if it drops we found the problem
This resistor is connected to which parts means one side and other side
Replace q3002 transistor
and if you find nothing changed ,
Otherwise , difficult but not recommend as last option
Solution1: use a jumper wire and attach one end where PCH susack# and connect other to suspwrdnack
Solution2
Jump wire from
+3VSUS_ORG to suspowerdnack
If we had complete schematic diagram it could help
Our goal is to provide 3.3 volt at suspwrdnack to check if it works or not
Flashing a good bios also an option with clean me regionComment
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Re: X550jx black screen but cpu heating up
Hold your thoughts I have to check something...
Comment
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Re: X550jx black screen but cpu heating up
Q3002 does not exist,
"ME SUSPWRDNACK" and "ME SUSPWRDNACK EC" is just connected trough R3071 and its a 0 Ohm resistor.
I will check what you suggested and get back.Comment
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Re: X550jx black screen but cpu heating up
Found a Schematic that is not exactly for this modell but whatever I looked up on this was good and correct for my modell too:Comment
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Re: X550jx black screen but cpu heating up
Check voltage at r2134 and r2106
This schematic diagram has power sequence where at step 6 we have sus_pwrgd and step 7 is suspowerdnack
and step 8 is after 200ms pm_rsmrst#
These signals are powered by 1.8vs
I am sure if all other signals are present
This is absent due to one of q3001a or b is working in abnormal condition
Check q3001a mosfet and q3001b it is a dual mosfet 6 pin
N channel so require high voltage in this case 3.3 to turn on and one will work at a time
Check voltage on pin 2 , 3 ,6 ,5Comment
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Re: X550jx black screen but cpu heating up
Sorry if i misslead you, but my previous statement is good:
"ME SUSPWRDNACK" and "ME SUSPWRDNACK EC" is just connected trough R3071 and its a 0 Ohm resistor. Q3001a and Q3001b in this board is not present but jumpwired directly
But you gave me an idea:
previously I have checked PCH_SUSACK# is 3.3v constant so EC give this signal out but I did NOT checked the other side of the R2232 resistor that is going to PCH. I check if I'm home.Last edited by questore; 12-22-2020, 05:00 AM.Comment
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Re: X550jx black screen but cpu heating up
- PCH_susack# 3.3v from start and constant
- ME SUSPWRDNACK goes up to 3.3v then it drops to 0v and stays that way.
(no short on any of them)
What does this mean?Last edited by questore; 12-22-2020, 01:19 PM.Comment
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Re: X550jx black screen but cpu heating up
ME_SusPwrDnAck should remain 3.3 high as per sequence , should never drop down
What is connected to other side of r2232
Which schematic is correct ,this new you attached or posted in previous page
Q3002 is important as per diagramComment
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Re: X550jx black screen but cpu heating up
PCH_SUSACK# is connected to PM_SUSACK through R2232
Unfortunatelly nor the schematic nor the Boardview is perfect for this model.
This is a minimalistic board and most of the components are missing and just connected trough direct 0Ohm resistors.
I'll try to make a good picture with high quality to make you a good baseline of this board.
I have no idea why ME_SusPwrDnAck goes down after 3.3v it does not makes sense to me. Its directly goes to KBC chip.
I have checked and its 0Ohm all the way through from chip to chip. No short to ground.Comment
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Re: X550jx black screen but cpu heating up
Q3002 missing and jumpered trough 0 Ohm resistor R3071 see picture1: SUSPWRDNACK_pic.jpg (516.9 KB).
R3071 pins
1 ME_SUSPWRDNACK
2 ME_SUSPWRDNACK_EC
Made picture of PCH_Susack area balow PCH to make you see how minimalistic this board is
PCH_pic.jpg (533.0 KB)
Attached FilesLast edited by questore; 12-23-2020, 03:17 AM.Comment
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Re: X550jx black screen but cpu heating up
Check at previous step
3vsus, 5vsus constant or dropping for 10sec
If drops we are getting close to faultComment
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Re: X550jx black screen but cpu heating up
+3VSUS is steady 3V
+5VSUS is steady 5V
+12VSUS is steady 13VComment
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Re: X550jx black screen but cpu heating up
When it goes down again tweezers create connection between suspwrdnack and pch_susack and check but carefully
We are providing 3.3 signal to pch to retain susComment
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Re: X550jx black screen but cpu heating up
If it turns on then I have a bad PCH? Just asking ...Comment
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Re: X550jx black screen but cpu heating up
Not exactly sure but another solution is put pq3002 and provide power there as per sequenceComment
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