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Samsung Galaxy A5 - Does not charge, does not connect to the computer

kanar2306 4773 19
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Why does a Samsung Galaxy A5 not charge or connect to a computer after SIM-slot damage, and can the damaged SMD part be the cause?

Yes — the damaged SMD part near the SIM slot can be the reason the phone neither charges nor connects by USB, because it may be shorting the circuit or has damaged the charging/USB path [#16737200] The key suspect identified in the thread is U7002; if you measure 4.9V on L7000 but 0V on C7002, that points to U7002 being faulty and needing replacement [#16737267][#16739137] One reply also notes that the SIM slot/system may have been mechanically damaged and suggests checking the related parts on the board [#16737267] If you do not have SMD rework tools, the practical fix is board-level repair or replacing the whole motherboard [#16737209][#16739141]
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  • #1 16737181
    kanar2306
    Level 17  
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    I warmly welcome...
    I had a damaged SIM card slot in the Galaxy A5. I managed to get it and now everything works, the SIM card sees etc. but charging does not work and does not connect to the computer. USB socket clean. I noticed that one element is damaged by the SIM card slot. Can it be the reason that it doesn't load ?? Everything else works without a problem. I marked this element on the second picture with a red circle ...
    Thank you in advance for your help...
    Samsung Galaxy A5 - Does not charge, does not connect to the computer Samsung Galaxy A5 - Does not charge, does not connect to the computer
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  • #2 16737200
    Pedros050
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    Hello. Clearly you can see that this SMD Chip is damaged. It may be doing some short circuit.
  • #3 16737205
    kanar2306
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    I thought so too. So I have to replace the whole motherboard ??
  • #4 16737209
    Pedros050
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    In your place I would do that. Look for the whole functional board for A5 and the phone will be like new.
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    #5 16737267
    sylweksylwina
    Moderator of Computers service  
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    Without exaggeration, probably just replace the SIM slot and the system, which probably has been mechanically damaged.

    Take measurements on the L7000 and C7002 as the coil has no voltage probably a problem with the USB board, as it is on the coil, and there is no U7002 on the capacitor to replace - that is, the circuit that is chipped in your case.
    Samsung Galaxy A5 - Does not charge, does not connect to the computer
  • #6 16739137
    kanar2306
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    I took measurements and on the L7000 I have 4.9V and on the C7002 unfortunately 0V. So U7002 for replacement ... Unfortunately, I can't do it without the right equipment ....
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  • #7 16739141
    sylweksylwina
    Moderator of Computers service  
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    Take it to the website, you will probably pay less as for a new CD.
  • #8 16739149
    kanar2306
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    The problem is that I'm in Germany and here they will probably want to replace the whole disc and not play in replacing the system ....
  • #9 16739160
    sylweksylwina
    Moderator of Computers service  
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    Unless you find an expert enthusiast or an individual from the phone like specialists who weld from two cars one :)
  • #10 16739173
    kanar2306
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    I think I will win here much sooner than I will find someone like that :)
  • #11 16742215
    kanar2306
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    What should the voltage be on C7002 ??
  • #12 16742283
    sylweksylwina
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    How well I remember 5V, but now I will not check.
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  • #13 16742474
    kanar2306
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    And how to bypass this system and apply voltage from the coil to the capacitor?
  • #14 16742554
    sylweksylwina
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    I do not recommend combining, probably the phone will not charge without the appropriate signals.
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  • #15 16742566
    kanar2306
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    If anything, the disc will be replaceable. I might risk it. :-)
  • #16 16748436
    kanar2306
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    I made a bridge between the coil and the capacitor. When the phone is switched off, after connecting the charger a large battery icon will appear and after a while it will go out, in a moment it will show up again and go off. Over and over again. With zero response turned on, that is, it did nothing. Replacement plate ....
  • #17 16787812
    kanar2306
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    Welcome back...
    I was able to arrange the motherboard and everything is ok but if the display goes out and then I press the on button on the side then the display will only show a green line at the top, the second time I will press the button on the side then it will turn off again and the third time I will press it the display is working normally ... And so every time ... Unfortunately I'm not sure if it was the same on the old motherboard, it has already gone to the trash ... Could it be the fault of the display ??
  • #18 16787853
    Pedros050
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    It can be or tape.
  • #19 16787872
    kanar2306
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    Well, I thought about the tape but I do it very gently, I do not move the phone at all, just press my finger on the button and each time it will turn on after the third press. After the first only green line.
  • #20 16787905
    Pedros050
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    The display starts to fall apart.
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Topic summary

✨ The discussion revolves around a Samsung Galaxy A5 that is experiencing issues with charging and connecting to a computer after a damaged SIM card slot was repaired. Users identified a damaged SMD chip as a potential cause of the charging failure, suggesting that replacing the entire motherboard might be necessary. Some responses recommended replacing the SIM slot and checking specific components (L7000 and C7002) for voltage issues. The author later confirmed a voltage of 4.9V on L7000 but 0V on C7002, indicating a problem with the USB board. Attempts to bypass the damaged system were discouraged, and the author ultimately replaced the motherboard. Post-replacement, the display showed a green line upon startup, leading to further inquiries about potential display issues.
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FAQ

TL;DR: Target 5 V on C7002 when diagnosing Galaxy A5 no‑charge/no‑USB faults; "How well I remember 5V." Focus on U7002/L7000/C7002 before replacing the board. [Elektroda, sylweksylwina, post #16742283]

Why it matters: This FAQ helps DIYers and repair techs quickly pinpoint the A5’s charging path faults and avoid unnecessary board swaps.

Quick Facts

Why won’t my Galaxy A5 charge or connect to a computer after SIM‑slot repair?

Damage near the SIM slot can nick a nearby SMD IC in the USB/charging path. Visual clues include chipped packages or missing corners. As one expert put it, “Clearly you can see that this SMD Chip is damaged.” Inspect U7002 and its passives before assuming a cable fault. [Elektroda, Pedros050, post #16737200]

What should I measure first on the A5 charging path (L7000/C7002/U7002)?

Start at the coil and capacitor that feed the USB/PMIC line.
  1. Measure L7000 for USB input presence.
  2. Measure C7002 for regulated output near 5 V.
  3. If L7000 has voltage but C7002 is 0 V, suspect U7002. These points isolate USB board versus IC failure quickly. [Elektroda, sylweksylwina, post #16737267]

What voltage should appear on C7002?

Expect about 5 V during USB input diagnostics. One expert noted, “How well I remember 5V,” which aligns with healthy charging line behavior. If you read 0 V at C7002 while USB power is present upstream, the charge/data IC is likely faulty. [Elektroda, sylweksylwina, post #16742283]

I read 4.9 V at L7000 and 0 V at C7002—what does that mean?

This pattern strongly points to a failed U7002 charge/data IC. The upstream coil sees USB power, but the capacitor side is dead. Replace U7002 or have a specialist rework it; board swap is the fallback. “U7002 for replacement” summarizes the diagnosis from measured values. [Elektroda, kanar2306, post #16739137]

Can I jumper the coil directly to the capacitor to force charging?

Do not. A coil‑to‑capacitor bridge caused a boot‑looping battery icon and no real charge. The phone needs proper handshake and regulation from U7002. Bypassing it risks further damage and unstable behavior. Use controlled repair, not hard jumpers. [Elektroda, kanar2306, post #16748436]

Should I replace U7002 or the whole motherboard?

If micro‑soldering is available, reworking or replacing U7002 is the efficient, lower‑cost option versus a full board swap. A seasoned member advised service work because you “will probably pay less as for a new” board. Reserve full board replacement for when component‑level repair isn’t possible. [Elektroda, sylweksylwina, post #16739141]

I’m abroad and shops only offer board swaps—any alternatives?

Seek an independent micro‑solder specialist or enthusiast who handles IC‑level work. Forum members noted that finding a skilled individual can avoid costly board replacements that some regions push by default. This route keeps your original board and data intact. [Elektroda, sylweksylwina, post #16739160]

After motherboard replacement, the screen shows a green line and only wakes on the third press—what’s wrong?

That symptom indicates a failing display assembly or flex. One expert replied, “The display starts to fall apart.” If the display lights correctly only on the third power‑button press, replace the screen module and re‑seat the flex. That restores normal wake behavior. [Elektroda, Pedros050, post #16787905]

What is U7002 on the Galaxy A5?

U7002 is the charge/data management IC in the USB path. It negotiates power, regulates voltage, and routes data. Mechanical damage here breaks both charging and PC connectivity. The thread identifies U7002 as the “circuit that is chipped” in this case. [Elektroda, sylweksylwina, post #16737267]

What are L7000 and C7002?

L7000 is a coil (inductor) carrying incoming USB power; C7002 is a capacitor on the regulated side. Healthy devices show voltage on both when charging. Voltage at L7000 but zero at C7002 isolates the fault to U7002. These landmarks speed troubleshooting. [Elektroda, sylweksylwina, post #16737267]

Could the USB sub‑board be the culprit instead of U7002?

If L7000 shows no voltage, inspect the USB sub‑board and connector first. However, if L7000 has power while C7002 reads 0 V, focus on U7002. Measure before replacing parts to avoid unnecessary swaps. [Elektroda, sylweksylwina, post #16737267]

Can a damaged SIM‑slot area affect charging and data?

Yes. Work around the SIM slot can damage nearby SMD components tied to the USB/charging line. In the case discussed, a chipped IC near the SIM slot correlated with both no‑charge and no‑PC connection symptoms. Inspect that zone closely under magnification. [Elektroda, kanar2306, post #16737181]

Is it safe to "bypass" the charging IC for a quick fix?

No. “I do not recommend combining,” an expert warned, because the phone requires correct control signals. Bypasses can cause charge loops, overheating, or further failures. Use proper IC replacement or professional rework instead. [Elektroda, sylweksylwina, post #16742554]

Will a new motherboard restore charging and data completely?

Yes, if the fault lives on the original board. After swapping in a replacement motherboard, charging and data worked normally in the discussed case. A separate display issue (green line, third‑press wake) pointed to the screen, not charging electronics. [Elektroda, kanar2306, post #16787812]

Any quick diagnostic stat to confirm a display issue post‑repair?

Yes. If the screen only wakes on the third power‑button press, and first press shows a green top line, suspect the display or flex. That three‑press pattern matches a failing screen assembly, independent of charging. [Elektroda, kanar2306, post #16787812]
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