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Identifying and Replacing Burnt SMD in MX08 Monster Truck RC Toy from China

kil0F 8700 19
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How can I identify the burnt SMD motor-driver chip in a cheap MX08 RC monster truck board, and what can I use as a replacement?

The burnt part is most likely a motor-driver H-bridge IC; one reply identifies the MX08 section as an H-bridge similar to the L9110, and another says the MX1515 is a double bridge while the MX08 drives one motor [#16818807] [#16823856] A datasheet for the L9110 was linked for reference, so you can compare its pinout and application circuit with the damaged board [#16821873] Later replies say the MX08 datasheet is available and that the L9110 can be used as a replacement if the pins/leads match [#18730744] [#18730866] The thread also warns that this is only a pinout-based substitution and not a confirmed drop-in equivalent, so you should desolder the damaged chip, photograph the pads, and verify the connections before fitting a replacement [#16818807] [#16826756]
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  • #1 16816757
    kil0F
    Level 10  
    Posts: 7
    Rate: 2
    Board Language: polish
    Hello,

    This item worked in a cheap radio controlled toy (Monster Truck from China). A friend connected a more powerful battery and burned the system.
    The circuit board is about 40x32 mm, the elements are on both sides.
    The power supply is a set of 4.8V rechargeable batteries. The original battery capacity is 700 mAh, and ultimately 2600 mAh.
    I was able to find very little about the burnt element - some markings are invisible.

    It's probably a layout like this page:
    www yoycart com/Product/42747566143
    or

    pl aliexpress com/store/product/Free-shipping-10pcs-MX08-DC-motor-driver-chip-SOP-8/1980358_32675130315 html


    I tried to take better pictures but I don't have a good enough camera:

    ] Identifying and Replacing Burnt SMD in MX08 Monster Truck RC Toy from China

    Identifying and Replacing Burnt SMD in MX08 Monster Truck RC Toy from China

    Identifying and Replacing Burnt SMD in MX08 Monster Truck RC Toy from China
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  • #2 16817095
    dr.master
    Level 39  
    Posts: 5112
    Help: 512
    Rate: 916
    Board Language: polish
    Russian forums suggest that it may be a replacement umf5n .
    Of course, not available in PL, you have to look for the parameters of some available substitute.
  • #3 16817262
    Anonymous
    Level 1  
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  • #4 16817844
    kil0F
    Level 10  
    Posts: 7
    Rate: 2
    Board Language: polish
    My element must have 8 legs, not 6 as in the given example.

    dr.master wrote:
    Russian forums suggest that the replacement may be umf5n.



    I managed to find out that it is a control element of a DC electric motor. Unfortunately, I still don't know what element (diode?) it is.
    Maybe let's start with that?
  • Helpful post
    #5 16818807
    wojtek 9007
    Level 40  
    Posts: 3939
    Help: 711
    Rate: 844
    Board Language: polish
    Hello - this is an H-bridge in one IC - similar to the L9110 system.
    Please desolder the damaged one and take a photo, it will be possible to determine it more.
    Of course, a photo of the board. This L9110 is for sale.
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  • #6 16821358
    kil0F
    Level 10  
    Posts: 7
    Rate: 2
    Board Language: polish
    Thanks Wojtek, it looks like we're getting closer to something concrete. The hints from Google Ads also coincide with your assumptions.

    Can you tell me how to find the schematic of the circuit you have given?

    Google Ads gives me the following suggestions:
    link

    link
  • #8 16822255
    Anonymous
    Level 1  
  • Helpful post
    #9 16822450
    wojtek 9007
    Level 40  
    Posts: 3939
    Help: 711
    Rate: 844
    Board Language: polish
    Hello - http://forum.cxem.net/index.php?/topic/133302-%D0%BF%D0%BE%D0%B8%D1%81%D0%BA-%D0%B0%D0%BD %D0%B0%D0%BB%D0%BE%D0%B3%D0%B0-mx08-%D1%81%D1%85%D0%B5%D0%BC%D0%B0-%D0%BD%D0 %B0-rx2/
    And ;
    https://www.yoycart.com/Product/534715248586/

    Added after 3 [minutes]:

    The most significant information is the PCB itself and the chip placed there
    and its function that it fulfills there (change of the right-left direction)
  • #10 16822475
    Anonymous
    Level 1  
  • #11 16823657
    kil0F
    Level 10  
    Posts: 7
    Rate: 2
    Board Language: polish
    I confirm that the function provided by Wojtek makes the most sense. There are 3 engines in this car. Two for driving forward and backward and one for turning left and right. The part of the engine control system for turning left and right has gone out. the other engines are working properly.
    So it is highly probable (as Feynman used to say) that it is the H-bridge.
    Perhaps it is a specific variation of this bridge because it supports up to 3 motors (two of them have common + and - so we can treat them as one because they are connected in parallel):

    Identifying and Replacing Burnt SMD in MX08 Monster Truck RC Toy from China

    I dug up another post, also from the electrode, regarding the identical system - sorry, but it didn't occur to me that someone would give the full name of the tile:

    https://www.elektroda.pl/rtvforum/topic3252443.html
  • Helpful post
    #12 16823856
    wojtek 9007
    Level 40  
    Posts: 3939
    Help: 711
    Rate: 844
    Board Language: polish
    Hello - the MX1515 system - it is a double bridge;
    http://www.datasheetspdf.com/PDF/MX1515/909509/2
    It drives two motors marked Y.
    The MX08 system drives one motor marked X.

    Added after 4 [minutes]:

    Identifying and Replacing Burnt SMD in MX08 Monster Truck RC Toy from China

    Added after 31 [seconds]:

    Identifying and Replacing Burnt SMD in MX08 Monster Truck RC Toy from China
  • #13 16826510
    kil0F
    Level 10  
    Posts: 7
    Rate: 2
    Board Language: polish
    Does the L9110 chip listed above have the same connections and pins as the burnt MX08?
  • Helpful post
    #14 16826756
    Anonymous
    Level 1  
  • #15 16828526
    kil0F
    Level 10  
    Posts: 7
    Rate: 2
    Board Language: polish
    Thank you for your suggestions. I'll try to desolder the chip and see what's underneath.

    Despair, maybe a little ;) . but knowing me, it's rather stinginess and reluctance to wait 2 months for a package from China for 2 dollars...
  • #16 16833460
    kil0F
    Level 10  
    Posts: 7
    Rate: 2
    Board Language: polish
    yellow are capacitors,
    the voltage connection is + and -,
    orange is silver something
    green are two chips,
    purple - without any markings,
    blue are probably capacitors again,
    the red ones are more resistances

    Identifying and Replacing Burnt SMD in MX08 Monster Truck RC Toy from China
  • #17 17339794
    Tadeusz Pokorski
    Level 2  
    Posts: 2
    Board Language: polish
    I have an MX08 to give away.!
  • #19 18730866
    wojtek 9007
    Level 40  
    Posts: 3939
    Help: 711
    Rate: 844
    Board Language: polish
    Hello - you can, as a replacement (no original to buy), match the leads (pins).
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  • #20 20234282
    kowal011
    Level 22  
    Posts: 463
    Help: 21
    Rate: 266
    Board Language: polish
    Identifying and Replacing Burnt SMD in MX08 Monster Truck RC Toy from China The scaler is present in the SG-90 modeling servos.
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Topic summary

✨ The discussion revolves around identifying and replacing a burnt SMD component in the MX08 Monster Truck RC toy after it was damaged by an overpowered battery. Users suggest that the burnt component is likely an H-bridge motor driver, with the L9110 chip being a potential replacement. The original component is confirmed to have 8 pins and is responsible for controlling multiple motors in the toy. Users share links to datasheets and schematics for the L9110 and MX1515 systems, while also discussing the need to compare pin configurations before attempting a replacement. The conversation highlights the challenges of sourcing components and the importance of accurate identification for successful repairs.
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FAQ

TL;DR: MX08 is a single H‑bridge motor driver used for the steering motor; “The MX08 system drives one motor.” Typical setup also uses an MX1515 dual bridge for two drive motors. Pin‑compatible swaps require remapping. [Elektroda, wojtek 9007, post #16823856]

Why it matters: This FAQ helps hobbyists identify the burnt SMD and choose a workable replacement to revive a cheap RC monster truck.

Quick Facts

What exactly is the burnt SMD labeled MX08 in the MX08/MX1515 RC board?

MX08 is a single H‑bridge DC motor driver used for the steering channel on this truck. The companion MX1515 is a dual H‑bridge for the two drive motors. “The MX08 system drives one motor.” [Elektroda, wojtek 9007, post #16823856]

Can I replace a blown MX08 with an L9110?

Yes, as a practical substitute when the original is unavailable, you can use an L9110 module or IC, but you must remap the input/output pins to the board’s traces. Verify enable, inputs, and motor outputs before power‑up. [Elektroda, wojtek 9007, post #18730866]

Does the L9110 have the same pinout as MX08?

No confirmed one‑to‑one pinout. Trace the local schematic around the IC, compare with the L9110 application, and map signals. Expect differences; treat this as a custom adapter job, not a drop‑in. [Elektroda, Anonymous, post #16826756]

How do I identify the H‑bridge on my PCB without legible markings?

Look for an 8‑pin IC near the steering motor connectors and battery rails. Desolder the damaged chip, inspect and photograph the pads, then trace inputs from the RX logic and outputs to the motor. “This is an H‑bridge in one IC.” [Elektroda, wojtek 9007, post #16818807]

What likely caused the MX08 to burn after a battery change?

A higher‑capacity pack can sustain higher stall currents and longer surges, overstressing the bridge when the steering motor stalls. The failure followed an upgrade from 700 mAh to 2600 mAh on a 4.8 V pack in this case. [Elektroda, kil0F, post #16816757]

How many motors does this truck use, and which chips drive them?

Three motors total: two parallel drive motors and one steering motor. MX1515 (dual bridge) drives the two “Y” motors; MX08 drives the single “X” steering motor. That 2+1 layout is standard for this board. [Elektroda, wojtek 9007, post #16823856]

Quick 3‑step: How do I map MX08 pins to an L9110?

  1. Trace RX logic lines to MX08 inputs and label IN1/IN2/EN.
  2. Trace motor pads to the H‑bridge outputs (A/B).
  3. Wire L9110 Vcc/GND, map inputs to RX lines, and outputs to the steering motor pads. [Elektroda, Anonymous, post #16826756]

Where can I find MX08 documentation or a pinout hint?

A datasheet reference for MX08 was shared in the thread. Use it to confirm pin functions and absolute maximum ratings before testing replacements. [Elektroda, bimbo1980, post #18730744]

What is the L9110 driver that people recommend here?

L9110 is a low‑voltage dual H‑bridge motor driver commonly sold as a small module. The shared datasheet and module page show typical connections and parameters for adapting it to toys. [Elektroda, wojtek 9007, post #16821873]

Any visual cues to map components on this board?

One contributor marked capacitors, resistors, chips, and connectors by color on a photo. Use that to orient yourself when tracing nets on the 40×32 mm PCB. [Elektroda, kil0F, post #16833460]

Is there a known source to buy an MX08 if I don’t want to adapt?

Users referenced marketplace listings for MX08‑branded parts. Availability varies and shipping can take weeks, so plan for delays or adapt with an L9110. [Elektroda, wojtek 9007, post #16822450]

Could the two parallel drive motors overload the board?

Yes. Parallel motors can double stall current. If steering binds while accelerating, supply surges and heat increase, risking another bridge failure. Confirm free rotation and add fusing if possible. The thread notes two drive motors in parallel. [Elektroda, kil0F, post #16823657]

What’s a modeling servo like the SG‑90 doing here?

A user noted a scaler present in SG‑90 modeling servos, highlighting that compact motor drive electronics are common in hobby gear. It’s a point of comparison, not a direct swap. [Elektroda, kowal011, post #20234282]

What should I do before ordering parts?

Desolder and inspect the failed IC area, then sketch the local schematic. Confirm which motor the chip drives and verify supply polarity. Clear photos help cross‑reference with candidate datasheets. [Elektroda, wojtek 9007, post #16818807]

Is there any community confirmation that MX1515 and MX08 share the board?

Yes. A contributor posted that MX1515 is the dual bridge for the two drive motors (“Y”), while MX08 handles the single steering motor (“X”), with images. [Elektroda, wojtek 9007, post #16823856]
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