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Hello,
I have this board 820-2879 that I persisted in repairing ...
It works on battery
On charger it supplies 2.6V on PPBUS_G3H
SMBUS_CHGR_SDA do not pulse
SMBUS_CHGR_SCL pulse
I replace R5280, U7000, D6950
I think it is a faulty SMC but I want to know your opinion before putting in the...
In the company we have a lot of A1706 / A1708 screens with similar problems.
There appears to be a problem with the PCB of the screen.
Are there any solutions or devices for calibration?
Most are in very good condition with some random issues like the blue streak in the photo ...
I have...
Hello,
Today I'm working on a board that came back from a customer because it no longer works after about 3 days ...
I cleaned the board so well that I no longer know what was repaired ... It seems that there was a short circuit on PP1V2_S3 because traces of soldering shows that I injected a...
Hello,
I have 820-00923-05 3.3ghz motherboard
The board seems to be working fine in safe mode.
However, it does not start in standart mode.
The verbose says:
** In memory panic stackshort succeeded ** bytes traced 222160 **
transmitting kernel state, please wait :
100.. recorded panic...
Hello it's me again, yes I have a lot of problems this week ^^
I have an 820-00165 board which has been restored. About 10 power rails were repaired ...
Now it starts and blocks when starting. First 3min on screen 1 and then infinitely on screen 2 ...
The problem persists during Mac OS...
Hello,
On this board all the power rails for the PM_SLP_S4_L power supply are present but the CPU does not send the signal.
PPBUS_G3H 8,58V
PM_BATLOW_L 3,31V
SMC_RESET_L 3,39V
SMC_PM_G2_EN 3,42V
SMC_ONOFF_L 3,42V
PM_RSMRST_L 3,25V
PM_PWRBTN_L 3,41V
PCH_DSWVRMEN 3,3V
PCH_INTRUDER_L 3V...
Hello,
I don't know what to do on this board anymore ...
The wifi works randomly, I cannot determine why ...
I measured the diode resistance linked to the wifi system but I cannot find any anomaly. What can you advise me to measure?
Thanks in advance
David
Hello,
I come today with this board with which I measured good values everywhere.
Only PPVCC_S0_CPU is not present
So I made the measurements of U7200 which should send to PPVCC_S0_CPU
CPU_VR_EN 0v OK
CPU_VIDSOUT 1.04v OK
CPU_VIDALERT_L 1.04v OK
CPU_VIDSCLK 0.365v INSTEAD OF 1.04V
CPUVR_ISUMP...
Hello,
As I explain in the title I have an 820-00281 board on which the XA and XB ports do not get 20V
The card works on TA and TB
The measures are as follows:
PP20V_USBC_XB_VBUS = 5V
PP3V3_UPC_XB_LDO = 3,3V
PP1V8_UPC_XB_LDOA = 1,8V
PP1V8_UPC_XB_LDOD = 1,8V
PP1V1_UPC_XB_BMC = 0V ( diode...
Hello,
Today I am on an A1466 model 820-00165 motherboard.
All voltage and resistance measurements look good.
I noticed C4002 and C4003 ripped off, so I replaced.
The fan is running but the card does not read USB, no LCD backlight.
With thermal camera I noticed U3900 heats abnormally 46 ° C...
Hello,
For this board, I saw 8.5 OHM on PP1V_S5G.
On a functional card I measure 1.09k OHM
I think CPU dead, I injected 1V on PP1V_S5G (I don't know if this is the right thing to do) and the CPU barely heats up.
Confirm if you have another idea or if the board is for the trash?
Thanks in...
Hello,
Do you know if there are solutions to check the status of iCloud lock on a non-functional mother-board?
In order to avoid making repairs only to find that the board is unusable.
Do you also have solutions for complete unlocking Apple ID on motherboards (no bypass solution) ?
Thank you...
Hello,
All coils are good except PP1V2_S3_REG
I confirmed a short circuit on PP1V2_S3
I inject 1V and nothing is heating up. I don't want to inject more to avoid further damage.
Do you think of a possible RAM problem, if so I start with which one?
thank you in advance
Hello,
I have this A1708 board which does not go up to 20V
The USB-C controller area is clean
The u2800 area very damaged, I replaced U2800 and do some retrofitting, now very clean
Now I have these abnormal measurements:
Q3100
PPDCIN_G3H = 5V (GOOD)
UPC_XA_GATE1 = 7.25V (NOT GOOD)...
Good morning all,
I am new to the forum.
I have several 820-00165 board with the same problem :
PM_SLP_S5_L = 0v
SMC work, main power rails work
I accumulated these boards because I was running out of time to working them
What do you recommend to check first?
Thanks in advance :)