Been troubleshooting this one for a few days.
I have all the voltages, 5V, 3.3V, 1.0V, 1.05V, 1.8V, 2.5V VDDP, 1.2V RAM
Board just sits with blinking DRAM LED.
One thing I have found is 1,8V_SPI at the BIOS chip, pin 8 is only 0.9V. It should be 1.8V
My understanding is because this voltage is low, the bios chip does not get enough power to turn on and hence the board is stuck.
Below are some voltages in that area if anyone can shed any light on it.
Boardview attached also.
[url]https://www.badcaps.net/forum/t...
Stevie_belfast
Member
Last Activity: 12-17-2024, 07:06 AM
Joined: 01-26-2015
Location: Belfast
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Gigabyte X570 Aorus Ultra Boardview & schematic
Hi guys
I need Gigabyte X570 Aorus Ultra Boardview & Schematic if anyone has them please!
Thanks in advance!... -
Re: MacBook Pro 820 00923-A seems to boot but no activity
LPC reset, can't find it?
LPC_FRAME_R_L = 3.3V
LPC_CLK24M_SMC_R 1.6V...Last edited by Stevie_belfast; 12-27-2022, 11:37 AM. -
Re: MacBook Pro 820 00923-A seems to boot but no activity
Ok
I am also missing CPU_ZVM_L therefore I'm also missing PPVCCEDRAM_S0_CPU.
So same as you cyber47.
CPU_ZVM_L comes from the CPU, so does this confirm CPU is bad?
From questions asked in your thread cyber47, I checked these rails and they are all 0.9V
CPU_VIDSOUT, CPU_VIDALERT_L, CPU_VIDSCLKLast edited by Stevie_belfast; 12-27-2022, 11:04 AM.Leave a comment:
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Re: MacBook Pro 820 00923-A seems to boot but no activity
Hi Cyber47
Yes as mentioned above, it drops to around 0.8V - 0.9V after 10 seconds or so.
I will have to check those other rails you mentioned.
Hopefully the CPU isn't dead, I don't see how on mine as only PP3v3 was shorted and this was not shorted to cpu vcore....Last edited by Stevie_belfast; 12-27-2022, 09:55 AM.Leave a comment:
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Re: MacBook Pro 820 00923-A seems to boot but no activity
PLT_RST_L is there.
I'll have to try a good bios, but probably dead CPU then.
What a shame.
Well thanks for your help Mon2.Leave a comment:
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Re: MacBook Pro 820 00923-A seems to boot but no activity
Sorry, should have mentioned, all rails seem to be up.
Haven't got it to hand right now but in the kohms, PPBUS_G3H is 13.10V
5V S0 rails are there
3.3V S0 rails are there
RAM rail is there
NAND rail is there
ALL_SYS_PWRGD is up
SMC_LID is there when lid is openedLast edited by Stevie_belfast; 12-24-2022, 06:23 PM.Leave a comment:
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MacBook Pro 820 00923-A seems to boot but no activity
Hi guys
Need a bit of help here if possible.
MacBook Pro 2017 A1706 820 00923-A
Came to me with no image and high fan spin.
Was taking 20V at 220ma, rebooting and back to 20V 220ma.
Found a short on PP3V3_TBT_X_S0 at C2976, little bit of water damage, fixed this and now it seems to go through the full boot order. High fan spin gone.
Takes 20V and goes to 700ma, 800ma, and finally settles at 500 - 600 ma. Seems normal to me. Though the fan does not... -
Re: 820 00850 Macbook Pro Slow performance
Update, just incase anyone else has a performance problem.
Found a dislodged cap, C7908, on PP3v3_G3H_PMU_VINTRC_R.
sluggish poor performance is now fixed and it seems to be running fine now.
Now just have to get past the 2005F error in recovery which seem to be due to WiFi issues.Leave a comment:
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Re: 820 00850 Macbook Pro Slow performance
Ok, strange one this.
Getting hot around QB300, and the caps above it, C7006, C7008, C7009.
Checked for shorts but none that I can find.
All 4 USBC ports work fine and switch to 20V
Other side of the board around Q3100 doesn't get as hot.Leave a comment:
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Re: 820 00850 Macbook Pro Slow performance
No signs of corrosion, very clean board.
I don't have a thermal camera but i'll look for hotspots the old fashioned way.
Yes a windows install would be very painful.
Ok, i'll keep on at it.
Thanks for the reply.Leave a comment:
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Re: 820 00850 Macbook Pro Slow performance
Changed U5850 & U5860 but still the same awfully slow performance.Leave a comment:
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Re: 820 00850 Macbook Pro Slow performance
Thanks for the info and reply,
Forgot to mention, I did replace U5870 from info gained from searching for something similar to this problem.
Cant get into diagnostics mode either, gets as far as entering wifi password then just hangs on blank screen.
I'll have a look at U5850 & U5860, cheers reformatt....Leave a comment:
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Re: 820 00850 Macbook Pro Slow performance
Cheers but i've reset NVRAM a load of times....Leave a comment:
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820 00850 Macbook Pro Slow performance
Hi guys
820 00850 board here, clean, no previous repair.
Had a short on PPBUS, I found the problem, was shorted cap C8150, replaced and macbook boots.
Problem is its very slow.
It would boot to login screen eventually, but mouse and keyboard very erratic and slow to respond.
When I tried Internet Recovery, it takes a few hours then fails on 2005F error.
When I try to boot from USB stick, it lets me select the stick, then just a blank screen and goes no further.
I restored using DFU... -
Re: Hp c14-ce0523sa
Thanks for those files guys, has not made any difference.
Still getting 5 long flashes, 3 short flashes on caps lock and fan at full speed, no display.Leave a comment:
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Re: Hp c14-ce0523sa
Thanks guys, will try those and report back.
Forgive me, still a newbie here.Leave a comment:
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Re: Hp c14-ce0523sa
Sorry!
This is the read I took from it.
Thanks
[URL="https://www.dropbox.com/s/lxsyu2qubmsor3l/Read1.rar?dl=0"]https://www.dropbox.com/s/lxsyu2qubmsor3l/Read1.rar?dl=0[/URL]Re: Hp c14-ce0523sa
Sorry!
This is the read I took from it.
Thanks
[URL="https://www.dropbox.com/s/lxsyu2qubmsor3l/Read1.rar?dl=0"]https://www.dropbox.com/s/lxsyu2qubmsor3l/Read1.rar?dl=0[/URL]Leave a comment:
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Hp c14-ce0523sa
Hi guys
Does anyone have a clean bios image for this laptop.
Cant get the one from the HP website to work.
Thanks -
Re: New Members - please post your introductions here
Hi guys, long time registered.
Only now starting to get into board repair, so any help along the way is most appreciated!
Thanks in advance.
CheersLeave a comment:
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