Re: 1706( 820-00923-a) touchbar mac pro 2017 boardview and schematic please
thanks for sharing!
willumpie82
Member
Last Activity: 11-21-2021, 03:15 AM
Joined: 10-25-2015
Location: denbosch
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Re: [820-00165] mba won't power on after shutdown
well the SMC did sh*t itself, but it worked out, after looking at the schematic I Only needed to fix two connections (most importantly the PWRON line from SMC to PHC) and a pull-up for a powergood signal
let me share some pictures......Last edited by willumpie82; 12-09-2020, 05:14 AM.Leave a comment:
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[820-00165] mba won't power on after shutdown
Hi all,
I have a A1466 (820-00165) on my desk with some wierd behaviour,
It won't power on using either the powerbutton or debug pads. I can only het it to boot (and work perfectly) when I power it down completely (disconnect and reconnect battery) than when I apply magsafe it boots fine. It will als o resume when in sleep.
The problem starts when it is shutdown. it won't respond to powerbutton, debug button, smc-reset etc
I replaced the Trackpad and cable, disconnected the keyboard cable no luck.
When I press the powerbutton on the keyboard...Last edited by willumpie82; 12-06-2020, 07:06 AM. -
A1708 020-00840 liquid damage, no power
Hi All,
I'm working on a case for data recovery of an A1708 board 820-00840
when I received the board it was doing absolutely nothing. I took some pictures of the corrosion and ultrasonically cleaned the board. this revealed some problem areas.
no power via USB-C (stays at 5v 0mA, other port 5v 50mA)
PP3V3_GH, repaired the circuit and now 3,4v present
both CD3215 replaced, PPDCIN_3GH present at Q7030 (usb 5v 10mA)
I did not trust the U7000 (weird impedance at Aux_det) so replaced it
now Aux det is 1,2v and R7015,... -
Re: boardview and schematic 820-3787 for RAIKO
thanksLast edited by willumpie82; 06-05-2020, 02:41 AM.Leave a comment:
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Re: A1466 820-00165 fan spin, no chime vcore present
Hi
The vcore rail and is is 1.8v
also verified all the other rails, all OK
ppbus_3gh = 8,57
PPBUS_S5_HS = 8,57
PPBUS_S5_HS_OTHER = 8,57
PPDCIN_G3H = 17,94
PPDCIN_G3H = 17,94
PP3V42_G3H = 3,42
PPVRTC_G3H = 3,34
PP5V_S5 = 5,109
PP5V_S4RS3 = 5,11
PP5V_S0 = 5,11
PP3V3_S5 = 3,34
PP3V3_S4 = 3,34
PP3V3_SUS = 3,34
PP3V3_S3 = 3,34
PP3V3_S0 = 3,35
PP3V3_S4SW_SNS = 3,34
...Leave a comment:
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A1466 820-00165 fan spin, no chime vcore present
Hi all,
I'm working on a rabbit-hole again, I have a 820-00165 board that has not been damaged (no liquid or other nasty stains).
It came with the story that it runs but freezes randomly, when we looked at it at first it came to the disk selection and then frozen now it won't display or chime at all. I removed the SSD and wifi and inserted a USB drive, no changes.
So opened it up removed the battery and when powering it on it gets fan spin but no chime and no image, looks brain dead to me...
on visual inspection the board looks mint
I...Last edited by willumpie82; 05-26-2020, 02:43 AM. -
Re: A2159 820-01598-06, charging but not running from batt
reply to self,
I suspect the battery board to be toast, when I measure the pads with nothing connected I measure ~12v, when i connect it to the board it drops to about 3v
I found the input circuit... found also that when I apply 12v @5A to the capacitor near the batt flex (with no batt connected) it runs from my fake battery
(see my annotated image I uploaded)...Leave a comment:
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A2159 820-01598-06, charging but not running from batt
Hi All,
I'm diagnosing a A2159 with the following issue
After waterdamage the device won't run from battery, when USB-C is connected it runs fine, battery seems to be charged, battery state is readout correctly, but when charger gets disconnected the machine shuts off.
I think it must have to do something with the circuit that combines the PPBUS_G3H and PPDCIN via the two diodes. In previous models this was done via a BAT30 SOT-323.
I tried to locate the PP3V3_G3H regulator but can't find anything on the board that I can identify as such
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Re: need board view a1398 820-3662-a
thanks for sharing!Leave a comment:
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Re: 820-3437-b j43 boardview needed
hey all,
I already have the schematics and brd file of this 820-3437 but I'm missing the page with the powersupply topology, I checked many copies of this shematic but none of them have this specific page, any clues (or equal-ish board hint)?Leave a comment:
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Re: Hp pavilion dv6000- 6960ej
what if you try to boot a different OS, let's say a ubuntu live USB-stick?Leave a comment:
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Re: New Members - please post your introductions here
Hi All,
As requested, my first post to say hello to the fellow Badcaps members
I came across this website while searching for a MBA schematic, i successfully found it here and it helps me allot!
In my spare time (after wornking at a big chip-machine-manufacturer in the netherlands starts with an A) I do all kind of repairs, from apple to xperias
I replace the glass but also repair on boardlevel and I'm able to diagnose and repair complex BGA parts. but mostly there are some broken ceramic...
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