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iPhone display circuit repair

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This video mainly explains how to find the displays power supply signals

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and measurement points of the iPhone 12 Promax

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Search method Step 1, find the display power supply in the iPhone 12 Promax component map

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Step 2, find the display power supply in the bitmap and confirm the position number

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Step 3, search for the position number of the display power supply in the circuit diagram,

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and find the corresponding signal

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Step 4, jump to the bitmap according to the position number,

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and find the connected components

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The yellow pints in the bitmap can measure the voltage and diode value

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When checking the circuit, we first open the iPhone 12 Promax component map, circuit diagram, and bitmap

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Find the display power supply in the component map,

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confirm the display power supply position number in the bitmap,

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search for the position number in the schematic diagram

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After finding the display power supply, find the corresponding signals according to the circuit diagram

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Let's find the 4.6V, 7.3V and -7V power supplies of the display power supply output

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A3, B3, and C3 of the display power supply internally mark VOUT1

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is the 4.6V power supply output by the display power supply

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Jump to the bitmap according to the name,

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the power supply is directly connected to the display

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The A5 pin of the display power supply is the 7.3V power supply

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Jump to the bitmap according to the name,

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the 7.3V power supply is directly connected to the display screen by the display power supply

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E5 F5 G5 and E3 F3 G3 of the display power supply are connected together,

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which is the negative 7V power supply of the display

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Jump to the bitmap according to the name,

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the power supply is connected to the display after passing through the fuse resistor R11870

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Lets' find other detection signals below

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First look for AMUX

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The C6 pin of the display power supply is the AMUX signal

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Jump to the bitmap according to the name,

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the signal is sent directly from the display power supply to the main power supply

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Let's find the screen identification signal sent by the main power supply to the display power supply, PANICB

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The E4 pin of the display power supply is the PANICB signal

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Jump to the bitmap according to the name,

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the signal is directly connected to the display power supply from the main power supply

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Let's find the screen identification signal from the display power supply to the display screen, PANICB

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The D3 pin of the display power supply identifies PANIC_OUT,

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indicating that this signal is the screen identification signal from the display power supply to the display screen

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In the bitmap, the signal is directly connected

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The C4 pin of the display power supply is the 4.6V power supply feedback pin,

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and the signal is connected to the 4.6V power supply after passing through the fuse resistor R9131

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If the resistor is damaged, the 4.6V power supply output will be abnormal

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The D2 and D1 pins are the test signals,

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which are only connected to the test points and not connected to other components

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We do not need to measure them during maintenance

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In the bitmap, we can find that this signal also has no connected components

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In this way, we have searched for all the signal pins of the display power supply

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Ok, that's all for this video