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Samsung Xcover 3 G388F Touch Issue - Non-Working Touchscreen After Fall, Need Diagram

max_gsm 8433 14
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 16676220
    max_gsm
    Level 18  
    Hello, how the topic does not work on the Samsung Xcover 3 G388F.
    The touch is functional because after switching to another phone, everything works as it should. The telephone after the fall, was not flooded, no traces of liquid.
    Maybe some of your colleagues have a diagram for this model.
    Thank you in advance for your help.
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  • #2 16676496
    KamGr
    Level 24  
    Have you tried hard reset? I had it too and it helped me.
  • #3 16676523
    KRY5PIN
    Level 37  
    The phone was down. It has not been damaged or has not dropped February on the LCD where the digitizer is attached ??
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  • #4 16715409
    max_gsm
    Level 18  
    Resetting did not help, and whether it was after a fall is difficult to say because it looks like new, without mechanical damage, but if you connect the digitizer to another disc it's all oki, i.e. the damage is on the disc. Maybe someone knows which element is responsible for touch in this model?
  • #5 16735165
    marrt
    Level 15  
    max you managed to activate the touch, I have a similar case after the exchange of touch no response to touch
  • #6 16735249
    max_gsm
    Level 18  
    I just failed but I already know what the problem is, I can take photos and describe what and how. If someone had a diagram for this, I think there would be no problem with repair.
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  • #7 16735273
    mahamalak
    Level 12  
    Find the schematic and check the layout responsible for the touch, it will probably be replaced.
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  • #8 16735289
    max_gsm
    Level 18  
    There's a problem with the schematic for this model, I can't find anywhere unless you know which system is responsible for the touch.
  • #9 16735363
    marrt
    Level 15  
    max if you can make a short description based on your photos
  • #10 16742438
    max_gsm
    Level 18  
    At the request of "marrt" and for everyone who has a similar problem with touch I made a small description. In the photo there are three very important resistors, each of them should have a value of 2.2 KoHm, if one does not, or its resistance changes, then the touch will not move and as I described in the photo on each of them must be 1.8V .
    If there is no such voltage on one of them, then the touch will not move, and umnie is so that everywhere I have a voltage of 1.8 V except in the one where it is marked with a yellow line, for me on the other side of the resistor is only 0.7 V and therefore touch doesn't work. I can't trace where this resistor is going because it looks as if something is occupied and this 1V is lost. If it turns out that there is no voltage at all on any of these resistors then you need to replace one more element that is on the other side of the board. I hope that this description helps someone put a problem with touch, and maybe someone comes to where this resistor is marked in yellow. Samsung Xcover 3 G388F Touch Issue - Non-Working Touchscreen After Fall, Need Diagram
  • #11 16745540
    Glemark1
    GSM specialist
    In the picture I have marked all the lines responsible for touch.
    Resistors are resistors that pull up data lines, clock etc. to power 1.8 in accordance with the I2C bus specification.
    Samsung Xcover 3 G388F Touch Issue - Non-Working Touchscreen After Fall, Need Diagram
  • #12 16749734
    max_gsm
    Level 18  
    Many thanks to "Glemark1" for the schematic, everything is fine with me and the touch still does not work because the TSP_CLK line voltage on the resistor disappears, instead of 1.8 V I have only 0.7V, I do not know where this line goes because that is the whole problem.
  • #13 16749837
    Glemark1
    GSM specialist
    On the other side of the resistor you will not have 1.8V because there is a generated waveform. Connect the oscilloscope and you'll see. This signal is generated directly by the processor.
  • #14 16749876
    max_gsm
    Level 18  
    I checked on the second board which is fully functional and is 1.8V on both sides of the resistor and on both.
  • #15 16796784
    max_gsm
    Level 18  
    Unfortunately I could not cope with this fault, the motherboard went to parts. Thank you for your help in the subject.

Topic summary

The discussion revolves around a Samsung Xcover 3 G388F experiencing touchscreen issues following a fall. The user confirmed that the touchscreen works when connected to another device, indicating the problem lies within the phone itself. Suggestions include performing a hard reset, checking for mechanical damage, and examining the digitizer connection. A follow-up revealed that the issue may be related to specific resistors on the board, which should measure 2.2 kOhm and have a voltage of 1.8V. A schematic diagram is sought to assist in troubleshooting, with users sharing insights on the importance of voltage levels across components. Ultimately, the original poster was unable to resolve the issue, leading to the motherboard being deemed irreparable.
Summary generated by the language model.
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