I have a HP Z800 with dual Xeon CPUs that turns on, but does nothing after that. Removing the GPU and RAM gives no error code.. the only error I get is 3x beep when I remove the CPUs. I probed the bios with an oscilloscope and there is no activity at all, it basically gets never accessed.
Voltages seem to be all present, I dont see any shots on the board or anything visually that show some issue.
The workstation seem to have works fine till one day it just started with black screen and thats the situation I have at the moment.
I did reflash the bios...
Kloper
Member
Last Activity: 07-01-2022, 01:58 PM
Joined: 02-27-2022
Location: Wien
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Is this inductor still usable?
Hi all,
I found this inductor in a server power supply and I am unsure if its still usable.
First I thought its an exploded diode, but when I removed it I saw the designation L on the PCB and after asking on discord it turned out its a inductor. How ever... it looks to me like its a wrap of thin layers of some material and its flaking off on touch. Also the area where it was, all the components there are covered in some white powder.. like there was an explosion going out from this inductor.
So the question is... is this still usable, and if not... what kind of inductor is... -
Re: A1989 (820-00850-A) Not powering ON, 20V on charger
Reflow didnt work really... I was just too afread to melt the connectors next to it. I did heat the IC for while and components around it started turning shiny but the IC just didnt want to move so I stoped before I melt everything. I dont have microscope to really see well what I am doing there. I will see if I can get somebody who has more experience with this and let him try it, or replace the IC... I feel like Ill just make things worse.
Thanks for you help tho!!! Really appreciate it!!!Leave a comment:
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Re: A1989 (820-00850-A) Not powering ON, 20V on charger
R9082 has 0V
I will try to reflow U9000 today... never did that before, so its gonna be interesting
U9080 I think ill skip since the water never got there. Only a few parts on the edge of board ware effected, atleast visible.
Ill update you after I did the reflow.
Thanks for your help and time!!Leave a comment:
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Re: A1989 (820-00850-A) Not powering ON, 20V on charger
Any idea what else I can check or what could be the problem?
Actually, if U9000 should generate this voltages as soon as the laptop gets power, then thats clearly the issue, or not?Leave a comment:
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Re: A1989 (820-00850-A) Not powering ON, 20V on charger
PPBUS_G3H is present with 12.5V and stabel.
My USBPowerMeter looks stable.
I found 1 pin that shows 20V on the board and it is stabel, how ever, I found a testPin that is jumping around, fluctuating alot cant even get a stabel reading.. its between 1-2 or maybe 0-2V on the TestPin TP(1)SAVE_XB_CC1_ZLeave a comment:
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Re: A1989 (820-00850-A) Not powering ON, 20V on charger
Hi, thanks for the feedback!
PP2V7_NAND_SSD0 is not present, but I was assuming that U9000 is making the voltages for the SSDs, or I understand that wrong?
Update:
I shoot too fast, just realised there are more voltages for the SSDs, how ever non is present.
PP0V9_SSD0: 0V
PP1V8_SSD0: 0VLast edited by Kloper; 02-27-2022, 01:08 PM.Leave a comment:
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A1989 (820-00850-A) Not powering ON, 20V on charger
Hi everyone,
its my first post here!
Just a few things about me so you know who you are dealing with
I am a complete beginner, never did any board level repairs. I have basic understanding of electronics and I do have a good DMM.
I have a dead macbook pro, it had some light water spill at a USB C port and since then its not turning on. I may have make things worse by injecting 1.5V but Ill come to that later.
I do have a boardview and schematic so I will use the names found there to explain the situation.
When I first opened the laptop,...Last edited by Kloper; 02-27-2022, 10:46 AM. -
Re: New Members - please post your introductions here
Hi everyone,
I am Kloper from Austria.
I was always interested into repairs, but had never really time to make it an active hobby, which changed now. I have very basic electronics knowledge and almost zero experience, but thats will hopefully change in the next few month.
I am always open for conversations, so if you have more question, feel free to PM me.Leave a comment:
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