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

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:

]

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.

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?

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.

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

Hello - the parameters and the diagram are here;
https://www.elecrow.com/download/datasheet-l9110.pdf

Added after 30 [minutes]:

Here is the diagram and description;
https://abc-rc.pl/modul-podwojnego-sterownika-l9110

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)

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):



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

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]:



Added after 31 [seconds]:

Does the L9110 chip listed above have the same connections and pins as the burnt MX08?

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...

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

I have an MX08 to give away.!

The MX08 datasheet is available here:
http://file2.dzsc.com/product/19/07/19/724863_172341355.pdf
Today I burned the MX08 and I wonder if it can be replaced with the L9110, of course, after matching the pins.

Hello - you can, as a replacement (no original to buy), match the leads (pins).

The scaler is present in the SG-90 modeling servos.