Macbook A2442 Backlight

UngaBungaMacbook

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Join Date: Jan 2023

Posts: 8

Country: Eesti
#1

Macbook A2442 Backlight

12-14-2023, 01:53 AM

Hellou!

Does anyone have any idea how could you test A2442 820-02098 screen backlight without the whole case,it has huge matrix of leds and i have 0 understanding how that all works.
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Macbook Pro A2442 820-02098 No image but has backlight

by Constantinos

Hi all
I have a Macbook Pro A2442 with the 820-02098 from a friend which has no picture on the display, however, the backlight works.
He was streaming a football match on a questionable site, then the site crashed, and the problem emerged.
Initially, he sent it to apple, who quoted him £1323.95 to replace the display, lid angle sensor and top case.
Obviously, he decided against this and gave it to me so that I could have a crack at it.
From initial diagnostics, I connected to an external monitor, I first tried with a HP 22W monitor, and I booted into the boot menu...
- Channel: Troubleshooting Laptops, Tablets, and Mobile Devices
08-24-2024, 09:48 AM
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by survivalbloke

I'm working on a MacBook Pro A2442, board 820-0298-A. This device was liquid damaged and had no power. After I repaired the liquid damage, I find the device powers on and works with external video, but backlight is not working.

Anyway, I really want to improve my fault tracing skills, instead of having to rely on others to always tell me where to look and what to check. In this case, I have a question about navigating schematics. If I wanted to trace the backlight power circuit, how do I find where that circuit begins? If I search for "lcd" in the schamtic, it is listed...
- Channel: Troubleshooting Laptops, Tablets, and Mobile Devices
11-21-2024, 10:46 AM
No Backlight Macbook A1990 820-01041

by Comp_Pro

Hello all,

Am trying to figure out this backlight issue with this A1990 Macbook Pro.

Tests performed:

There is no backlight even with a good screen.
Backlight IC is receiving the correct support voltages.
Fuse F8400 ok
Current sense resistor R8400 ok
Backlight IC is receiving 3.3V on enable pin.
Backlight IC receiving voltage from PPBUS_G3H, aprox 12.5V.
Backlight IC receiving 5V from PP5V_G3S
Backlight IC BKLT_SCL and BKLT_SDA both measure 0.545V diode mode to ground
I2C_BKLT_SCL and I2C_BKLT_SDA both measure...
- Channel: Troubleshooting Laptops, Tablets, and Mobile Devices
05-06-2024, 10:23 PM
MacBook Pro A1909 LCD (no backlight)

by francescoranchi

Hello Everyone,
I'm looking at purchasing a used LCD from ebay for my macbook A1990 2018 15inch which LCD I cracked. Since new / used but working displays cost around 500$ , I found a Grade A+ LCD display for A1990 which has a good price of 110$ but has no backlight.
I would need just to make sure that what I know/my reasoning is correct:

- No backlight means flexgate issue, therefore changingthe flexcable would be enough (I can microsolder to fix the flexgate problem, done it a few times already)
- Seller confirmed its a LCD issue, and not an issue with the...
- Channel: Troubleshooting Laptops, Tablets, and Mobile Devices
12-04-2023, 06:46 AM
Apple MacBook A2337 - No backlight

by tommy97

Hi guys, I've got MacBook Air a2337 with no backlight. Once while testing it displayed with the backlight, however after restart problem come back.

The laptop was tested with fully working screen.

PP5v_BKLT_A/B 5V
PP5v_BKLT_D 5V
PP5V_S2 5V
PP5V_SW_LCD 0.4V
P5VS2_PWR_EN 1.8V
P5VS2_BST_R 8V
P5VS2_SW 5V
PPBUS_5VS2_VIN 5V
PPVOUT_LCDBKLT - Doesn't short 0V
FP800 - Both sides 12v
BKLT_EN_R & BL_PWR_EN - around 1.8v

LP800 0.014V On both sides (should be 12? / no short)
UC300 & UP800 Replaced...
- Channel: Troubleshooting Laptops, Tablets, and Mobile Devices
12-02-2024, 08:26 AM
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Macbook A2442 Backlight

Macbook A2442 Backlight

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