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iPad Pro 11" 2nd model.
Itunes No. 9 error occurred, so I removed NAND. And I checked the components.
Among the rails that power the NAND, PP1V8_EXT_SW1 is abnormal. The diode value is very low at 0.040. This power rail is the rail that comes...

The speaker also doesn't output boot sound. So I noticed another issue.
When I try to restore in apple configurator, error 21 is output. It wasn't booting properly in the first place. According to repair wiki, error 21 is ROM or NAND error,

[URL]https://logi.wiki/index.php/DFU_Mode_Restore_(Macs[/URL])

([B]21[/B][COLOR=#202122][FONT=sans-serif][SIZE=14px]- Resolved with SoC ROM replacement. On macbooks with an M1 processor, this error also means problems with NAND chips such as:[/SIZE][/FONT][/COLOR][LIST][*]Failure of one or two NANDs.[*]Mismatch between the NAND...

Haptic feedback on the trackpad works, and the app configurator on other MacBooks recognizes this MacBook.(not DFU status) That is, the power is turned on normally. However, nothing is output on the screen. no backlight, no image.

Both screen and screen cables are fine.
The result of the logic board check is as follows.
PP1V8_S2 = 1.8v
PP3V3_S2 = 3.3v
PP5V_S2 = 5v
PP3V8_AON_VDDMAIN = 3.8v​
PP5V_SW_LCD = 0v
PP3V3_SW_LCD = 0v
PPVOUT_LCDBKLT = 0v
LCD_PWR_EN = 0v
PMU_SYS_ALIVE = 1.8v

There is no short circuit in...

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When replacing the screen of this MacBook model, the DP855A chip must be moved from the existing screen for the screen to operate properly.
However, when I removed the DP855A chip from the existing screen, I must have done something wrong and the chip broke.
Testing the chip pins with a multimeter revealed a short circuit inside the chip.
Is it impossible to repair this? I couldn't find a programmer...