-
-
Re: Macbook A1932 Intermittent Backlight Issue 820-01521
Hello Mon2 and Piernovv, the problem still persists randomly.
I have an observation here ! Closing the LID and re opening it will always ensure that an Image Appears. It may be for a 10 seconds or a couple of days but it appears. If there was an issue with the LID sensor then Music/Youtube will stop working but that doesn't happen. Laptop works with No Image.
When we close the LID the music stops. So the LID Sensor is working fine i believe.Comment
-
Re: Macbook A1932 Intermittent Backlight Issue 820-01521
Monitor the multiple power rails on the lcd connector when the display is working and when it is not.
The LCD works on other boards or you have tested others on this one?Comment
-
Re: Macbook A1932 Intermittent Backlight Issue 820-01521
Do not have any other board to check.
Disconnected the Audio Board and it works well since the sensor is in the audio board. Now the display doesnot go blank and runs perfectly for hours. Do you think that the tiny board can be the issue?Comment
-
Re: Macbook A1932 Intermittent Backlight Issue 820-01521
See numerous tantalum capacitors on the audio board. Check their resistance to ground.Comment
-
-
Re: Macbook A1932 Intermittent Backlight Issue 820-01521
What is the meter scale used for this resistance check ?Comment
-
Re: Macbook A1932 Intermittent Backlight Issue 820-01521
Can you clarify the scale for this reading ?Getting .670
0.67 ohms ?
670 ohms ?
670k ohms ?Comment
-
Re: Macbook A1932 Intermittent Backlight Issue 820-01521
Using an Analog Meter Now.
Meter Set to 2K.
Resistance at Pin #1 of C0491 and C0492 is .562.
( Battery Disconnected. The Flex from main board to Audio Board Disconnected. Red probe on the ground)
Resistance at Pin #1 of C0491 and C0492 is .377
( Battery Disconnected. The Flex from main board to Audio Board connected. Red probe on the ground)
Resistance at Pin #1 of C0491 and C0492 is .377
( Battery Disconnected. The Flex from main board to Audio Board connected. Red probe on the ground)
Voltage at at Pin #1 of C0491 and C0492 is 12.65V (PPBUSG3H)Last edited by Instafixx; 08-23-2022, 02:11 AM.Comment
-
Re: Macbook A1932 Intermittent Backlight Issue 820-01521
Ok. So 0.562 is 562 ohms, etc. Ppbus_g3h is a good voltage.Comment
-
Re: Macbook A1932 Intermittent Backlight Issue 820-01521
Finally i have pulled out the speaker near the audio board and using it. The hall sensor is totally disabled.
Had sent it to Apple for a Diagnostics - their report suggest that the main board is at fault needs to be changedComment
-
Re: Macbook A1932 Intermittent Backlight Issue 820-01521
See attached. Press the referenced button on your meter till you are in the RESISTANCE scale. The omega / horse (ghoda) shoe symbol will be shown in the bottom right of the display.
Then post a picture again to confirm it.Attached FilesComment
-
-
Hi everyone,
I'm working on a MacBook Air 2020 (A2337, board 820-02016) and running into a strange USB-C issue. I've gone through quite a bit of testing and part replacement, but I'm stuck β hoping someone here can shed some light.
π Original Issue
The machine initially wouldn't negotiate 20V over USB-C β stuck at 5V.
Diagnosis showed PP1V5_UPC0_LDO_CORE shorted to ground.
I replaced U3100 (UF400) using a donor board (A2179), and the machine powers on fine now.
β οΈ New Problem: One USB-C Port Only Works in One Orientation... -
hi
i whant unlock macbook pro A1932 2019 whit ibridge 9,3 ;
i change efi files find on files mina T2 activator 1,4 and use for activation mina T2 activator 1,3 , but fault ssh?
i use mina T2 ramdisk activator 1,0 and 3,0 . but whon t work ?
have you other programme or method compatible whit this macbook ibridge 9,3 for bypass ?
I need help or information?
Does anyone have the minat2 activator 1.4 software?
Or did they use it for bypass macbook air 2019 a1932 with new ibridge 9.3?
Thank yo...03-12-2025, 10:14 AM -
Subject: Help Needed: MacBook A1278 (3115) No PPBUS_G3H Issue
Hello everyone,
I'm working on a MacBook A1278 with the 3115 logic board and facing an issue with no PPBUS_G3H voltage. Here's what I've checked so far:- U7000 Measurements:
- Pin 3 has 0V, even though R7012 shows 16.5V from PPDCIN_S5_CHGR.
- Resistors:
- I measured R7010 and R7011 with one leg disconnected, and both tested OK.
Based on these findings, I believe U7000 needs to be replaced. However, I have a related question:- If I also decide to replace the SMC, do I need to order it pre-programmed,
- U7000 Measurements:
-
Hello there
I have problem with Macbook Pro 15" 2017, model 2017, MB code 820-00928.
I bought it as broken with some artefacts on the screen, first I thought that this is problem with ribbon cable but after inspectiing ribbon cable I know it is fine. I tried to reinstall macOs and then I figured out that this must be something with GPU as installation freezes at the end (when drivers are loaded). I installed Windows and was able to install every each of drivers except GPU driver, as soon as I tried to install GPU driver - black screen and restart.
...11-21-2024, 05:25 AM -
Hello,
I have a problem with an Asus X553MA motherboard. Sometimes the system works fine, but other times the CPU voltage drops to 0V. In most cases, the laptop reboots after a few seconds due to the voltage drop.
Occasionally, it shows the ASUS logo or boots into the BIOS. Sometimes it can stay in the BIOS for hours without issue.
I checked the board with a thermal camera, but I couldn't find any overheating or leaking capacitors.
Unfortunately, I donβt have access to the schematic.
It seems to me that when I bend the board, something changes.
Could this...
Comment