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Huawei P8 Lite: Identifying Memory Card Layout Post Isopropanol Cleaning

kamin23 7236 7
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16720868
    kamin23
    Level 12  
    Posts: 147
    Help: 3
    Rate: 14
    Hello,
    Can you tell which layout is responsible for the memory card? The phone was flooded, I cleaned it with isopropanol. Maybe I missed one item. Huawei P8 Lite: Identifying Memory Card Layout Post Isopropanol Cleaning Huawei P8 Lite: Identifying Memory Card Layout Post Isopropanol Cleaning
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  • #2 16732356
    kamin23
    Level 12  
    Posts: 147
    Help: 3
    Rate: 14
    In the picture I put the transitions on the board. I did not find only where the power comes from.
    Huawei P8 Lite: Identifying Memory Card Layout Post Isopropanol Cleaning
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  • #3 16803644
    kamin23
    Level 12  
    Posts: 147
    Help: 3
    Rate: 14
    Nobody solved this problem? I will add that the SD card works properly in another Huawei P8. I also did factory settings and hard reset.
  • #4 16803784
    helterskelter33
    Level 18  
    Posts: 987
    Help: 22
    Rate: 57
    Look for a voltage stabilizer near the card reader, look at the contact plates if they are tarnished.
  • #5 17822810
    kamin23
    Level 12  
    Posts: 147
    Help: 3
    Rate: 14
    Hello, I got a phone with the same problem, maybe this time I can solve the problem. After flooding, the phone has been cleaned but still cannot read the SD card. Transitions are, only the ldo10 power supply which goes from U301 is missing. Is the U301 to be replaced?

    Added after 1 [hours] 32 [minutes]:

    Huawei P8 Lite: Identifying Memory Card Layout Post Isopropanol Cleaning Huawei P8 Lite: Identifying Memory Card Layout Post Isopropanol Cleaning Huawei P8 Lite: Identifying Memory Card Layout Post Isopropanol Cleaning Huawei P8 Lite: Identifying Memory Card Layout Post Isopropanol Cleaning

    Added after 6 [minutes]:

    Is ldo7 a filter supply? I desoldered the filterek and only 0.5V instead of 3V on ldo7. Ldo7 also goes from u301. Huawei P8 Lite: Identifying Memory Card Layout Post Isopropanol Cleaning
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  • #6 17823203
    plustek
    Level 31  
    Posts: 1427
    Help: 176
    Rate: 200
    Hello. LDO10 appears when the CPU detects a 1.8V GPIO_2_0_SD_DET_N short circuit on TP2318.
    Huawei P8 Lite: Identifying Memory Card Layout Post Isopropanol Cleaning
    Attachments:
    • Alice-Top Failure.xlsx (10.13 MB) You must be logged in to download this attachment.
  • #7 17836431
    kamin23
    Level 12  
    Posts: 147
    Help: 3
    Rate: 14
    Hello, thank you colleague Plustek for the materials he shared. At TP 2318 without a card I have 1.8V and with a 0V card, i.e. correctly. LDO 10 appears and disappears. Impedance between mass and contact plates about 1000, i.e. something is wrong and according to the algorithm you need to replace D2312?
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  • Helpful post
    #8 17836868
    plustek
    Level 31  
    Posts: 1427
    Help: 176
    Rate: 200
    Impedance is given with the meter set to measure the diode, with the meter plus on the mass. The values may vary slightly, with significant discrepancies start from D2312.
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Topic summary

✨ The discussion revolves around troubleshooting the memory card layout of a Huawei P8 Lite after it was cleaned with isopropanol following water damage. The original poster seeks assistance in identifying the layout responsible for the memory card functionality, noting that the SD card works in another device. Various responses suggest checking for a voltage stabilizer near the card reader, inspecting contact plates for tarnishing, and addressing potential issues with the LDO (Low Dropout Regulator) components, specifically LDO10 and LDO7, which are linked to power supply problems. The conversation includes technical measurements and suggestions for replacing components like D2312 if impedance values are incorrect.
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