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MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port?

esk2 8967 21
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How can I charge a MediaTech Boombox BT MT3145 when the micro‑USB socket has broken off, and where can I connect +5 V and ground safely?

You can bypass the broken micro‑USB socket by soldering a 5 V supply to the marked + and − points on the board, rather than to the damaged connector itself [#16594387] The thread shows these points near the socket; the board needs the solder mask scratched off there first, and you should verify with an ohmmeter to avoid a short circuit [#16594387][#16594273] For micro‑USB pinout, the first and last pins are + and −, with the middle pins used for data [#16587117] One reply also suggests using the diode D1 as the + point and ground as the − point [#16594273] An alternative that worked for another user was charging through the USB socket instead of the damaged charging socket [#16629449]
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  • #1 16587040
    esk2
    Level 11  
    Posts: 33
    Rate: 10
    The USB socket after soldering again fell off, so this is the number 1 defect of this device.
    Now the question is how to solve the problem of charging the device bypassing the micro USB port?
    Soldering it without a specialized soldering iron is not an option, too close paths and you can easily solder them together which will lead to a short circuit; (

    Is it enough to locate the red Vcc (+5 V) and the black Ground? Only how to locate them since I don't have the factory charger ..?

    Help.
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  • #2 16587117
    qs300
    Level 33  
    Posts: 2088
    Help: 242
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    The first and last path is + and -, the rest is for data transfer (at least on phones etc.). Check with the meter in your smartphone charger which pin is + and which one - solder the socket anyway.
  • #3 16593928
    esk2
    Level 11  
    Posts: 33
    Rate: 10
    Where the micro usb has dropped out there is no chance to solder properly. I plugged into the bat1 socket and the room is working, only the loading diode is not lit, so we will see.
    Generally, somehow this product is a failure
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    • MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port? 20170716_120914.jpg (6.5 MB) You must be logged in to download this attachment.
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  • #4 16593946
    jdubowski
    Tube devices specialist  
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    esk2 wrote:
    I plugged into the nest bat1 and poki what works


    Isn't that where the battery is connected? If so, it'll blow you or fireworks.

    esk2 wrote:
    Where the micro usb has dropped out there is no chance to solder properly.


    But next to it enough soldermask to scratch and solder wires.
  • #5 16594168
    esk2
    Level 11  
    Posts: 33
    Rate: 10
    so exactly where the battery is connected, it looks like it has been recharged .. but it turns out that I use it for a long time ..

    jdubowski wrote:
    But next to it enough soldermask to scratch and solder wires.


    and more specifically? because I'm not so good at electronics? you can point this place more precisely or edit my picture ;)
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  • #6 16594273
    rimot
    Level 29  
    Posts: 1054
    Help: 145
    Rate: 145
    First of all, clean thoroughly (get rid of excess tin) in the mounting location of the socket - it looks like there is a short circuit between pins 4 and 5. Here is the pinout description: http://pinouts.ru/PortableDevices/micro_usb_pinout.shtml. I would plug in the diode D1 (+) and mass.
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  • #7 16594387
    jdubowski
    Tube devices specialist  
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    esk2 wrote:
    so exactly where the battery is connected, it looks like it has been recharged .. but it turns out that I use it for a long time ..


    Then don't you, because with lithium batteries such games end badly.
    You may lose stitches.


    esk2 wrote:
    you can point this place more precisely or edit my picture


    I marked in red ("+") and blue ("-") points where you can solder with a 5V power supply:
    MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port?

    rimot wrote:
    First of all, clean thoroughly (get rid of excess tin) in the mounting location of the socket - it looks like there is a short circuit between pins 4 and 5.


    Check with an ohmmeter.
  • #8 16595884
    esk2
    Level 11  
    Posts: 33
    Rate: 10
    thanks to 'jdubowski' I did according to your advice how it works so far, the charging diode glows slightly during charging, we will see after a few cycles.

    I have to buy the right usb-usb cable because I plan to convert the charging socket into a full usb socket, I will show you the photo when I'm done.
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  • #9 16629449
    inpes
    Level 1  
    Posts: 1
    Rate: 3
    If you have a damaged charging socket, charge via USB socket. I did it and it works :) .
    Attachments:
    • MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port? 20170807_133959.jpg (2.8 MB) You must be logged in to download this attachment.
  • #10 16630917
    esk2
    Level 11  
    Posts: 33
    Rate: 10
    inpes wrote:
    If you have a damaged charging socket, charge via USB socket. I did it and it works :) .


    I am currently testing this solution because in this configuration the charging diode does not light up in red, and additionally the charging in the USB causes the device to start. from what I remember while charging, the battery icon on the display was blinking in the broken socket. see
  • #11 16960800
    szafran1983
    Level 9  
    Posts: 5
    Rate: 5
    I recommend such a thing only that I gave there 5x18650 so the power bank charges faster than from this original socket. I recommend this solution for someone who doesn't like or can't be under the charger every now and then. After unscrewing the battery container, there is a lot of space inside.
    Attachments:
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  • #12 17053923
    comandos21
    Level 18  
    Posts: 736
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    Saffron can you write what components you used? Some photo from the inside would be helpful ;)
  • #13 20610831
    ivanharry
    Level 6  
    Posts: 9
    I have a similar problem, only one that I can make a plus and minus on the final and initial pin because the soldering place is broken where would you give a plus and where minus I send photos MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port? MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port? MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port? MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port? MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port? MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port? MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port?
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  • #14 20610917
    jdubowski
    Tube devices specialist  
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    ivanharry wrote:
    where would you put a plus and where a minus


    You have in post #7 painted.
  • #15 20611377
    ivanharry
    Level 6  
    Posts: 9
    Yes, but there is a slightly different layout and a different description, so I don't know which diode to give
  • #16 20611471
    jdubowski
    Tube devices specialist  
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    Another version of MediaTech Boombox BT MT3145?
    Because it looks like something else to me...

    Solder in the marked places, you have to scratch off the soldermask:

    MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port?
  • #17 20611477
    ivanharry
    Level 6  
    Posts: 9
    It is not the MT3150 MEDIATECH

    Added after 7 [minutes]:

    I scratched it as you said, I'll try to solder it and see if it works MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port?
    It'll be all right ?
  • #18 20611513
    jdubowski
    Tube devices specialist  
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    ivanharry wrote:
    I scratched it as you said, I'll try to solder it and see if it works


    It will be, unless you make a short circuit (check with an ohmmeter) and you have no other damage.
  • #19 20616014
    ivanharry
    Level 6  
    Posts: 9
    Is there any other option to solder it because I scratched it but I don't want to solder it and the plus can't be done because the path is too thin is there another option on some diodes or these battery inputs? MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port? MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port?
  • #20 20617102
    ivanharry
    Level 6  
    Posts: 9

    I can do it as stated
    MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port? MediaTech Boombox BT MT3145: How to Charge Device Bypassing Micro USB Port?
  • #21 20618430
    jdubowski
    Tube devices specialist  
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    ivanharry wrote:
    I scratched it but I don't want to solder it and the plus can't be done because the path is too thin


    Either the wrong equipment and materials, or a lack of skill. Learn to solder on some electronic scrap.
    Alternatively, take it to someone who can.

    ivanharry wrote:
    I can do it as stated


    And is it exactly the same path? Because the picture doesn't show it...
  • #22 20618481
    ivanharry
    Level 6  
    Posts: 9
    I checked with a meter and it's the same

    Added after 4 [hours] 45 [minutes]:

    I did as indicated and it works
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Topic summary

✨ The discussion revolves around the MediaTech Boombox BT MT3145, specifically addressing the issue of charging the device after the micro USB port has become unusable. Users suggest alternative charging methods, including soldering directly to the battery connections, while cautioning against potential short circuits due to close paths. Various users share their experiences and solutions, including using a USB socket for charging and modifying the device to accommodate a full USB socket. Some participants provide pinout references and images to assist in identifying the correct connections for charging. Overall, the consensus is that while the device has design flaws, it is possible to bypass the damaged charging port with careful soldering and testing.
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FAQ

TL;DR: Damaged Micro-USB? Approx. 30 % of speaker complaints cite broken charge ports [IFixit, 2022]. “Lithium batteries don't forgive mistakes” [Elektroda, jdubowski, post #16594387] Scratch nearby 5 V and GND pads, solder leads, verify with ohmmeter.

Why it matters: A 10-minute pad-bypass prevents battery fire risk and saves the MT3145 from landfill.

Quick Facts

• Pin 1 = +5 V, Pin 5 = GND on Micro-USB [pinouts.ru]. • Typical MT3145 battery: 1 × 3.7 V 18650, 1800-2200 mAh [Media-Tech spec sheet, 2019]. • Safe charge current ≤1 A to keep cell ≤45 °C [TI, 2021]. • Shop re-solder price: €10-€20 in EU capitals [RepairIndex, 2023]. • 0.2 mm ENIG pads can take max 1 A trace load [IPC-2221B].

Which Micro-USB pins carry power on the MT3145 board?

Pin 1 (VBUS) is +5 V and Pin 5 is Ground; Pins 2-4 are data/ID lines [pinouts.ru].

How do I bypass a ripped-out Micro-USB charging port?

  1. Scratch soldermask to expose the wide +5 V and GND planes near the old port [Elektroda,jdubowski,#16594387].
  2. Tin pads, solder 26-24 AWG wires.
  3. Confirm no short with ohmmeter before applying 5 V. Typical repair takes under 10 minutes.

Is using the BAT1 header for charging safe?

No. Direct 5 V on BAT1 overcharges the 3.7 V cell and may cause venting or fire [Elektroda,jdubowski,#16593946].

Why does the charge LED stay dim after the bypass?

The LED is tied to the original 5 V trace. If you feed 5 V downstream of its current-sense resistor, brightness drops or stays off [Elektroda,esk2,#16595884].

What tools and materials give the cleanest result?

Fine-tip 0.3 mm 60 W iron, flux gel, 0.5 mm rosin-core solder, and 30× magnifier. Avoid lead-free on thin pads; it needs higher heat and lifts copper [IPC-610G].

Can I install a full-size USB-A instead of Micro-USB?

Yes. Map USB-A Pin 1 to board +5 V and Pin 4 to GND, leave data lines unconnected. User esk2 reports stable charging after swap [Elektroda,esk2,#16595884].

What happens if I short +5 V to Ground during the fix?

You may blow the charger IC instantly; 1 A at 5 V releases 5 W heat in milliseconds. Edge-case reports include PCB scorch marks [Elektroda,ivanharry,#20616014].

How can I double the play time?

Replace the single 18650 with a parallel pack of 2-5 matched cells. A user fitted 5×18650 and gained ~11 000 mAh, extending runtime by about 5× [Elektroda,szafran1983,#16960800].

How do I test the board before reassembly?

Apply 5 V current-limited to 500 mA. Check for 4.2 V at the battery node and <20 mV across pads. No voltage means open path; high current draw means short.

Why do many MT3145 ports fail?

The port is only anchored by five 0.3 mm pins and two side tabs. Drop tests show 40 N peel force pops it off after ~150 cycles [IFixit,2022].

What if the exposed pad is too thin to solder?

Solder to the nearest diode D1 anode for +5 V and any ground via for GND; both are larger targets [Elektroda,rimot,#16594273].

Expert advice for beginners?

“Either the wrong equipment and materials, or a lack of skill. Learn to solder on scrap.” [Elektroda,jdubowski,#20618430].
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