Steelshock 4 v2 controller

[Péter Fodor]

I have got an Steeldigi Steelshock 4 v2 controller won't draw any amp from outlet.
I have disassembled and removed the battery. I have tied to measure some points. The usb connector shows 5 volts. There are test points and shows 5 volts everywhere it should. The battery connector in diode mode shows 0.009v is it ok?

There is an U4 chip place, but no chip, between the battery connector and the charging port.

How should I progress to identify the problem?

Can anyone help me with this?

[stj]

if you plug in the usb, what voltage do you get at the battery connector?
and what is the actual voltage on the unplugged battery?

[Péter Fodor]

With USB plugged in the pins shows 14 mV
The original battery shows 0.01 mV
Replaced with an 3.7V fully charged battery, but the controller won't turned on with it.

[SMDFlea]

The wires at RM1 ,are they soldered the wrong way around

[Péter Fodor]

The wires at RM1 ,are they soldered the wrong way around

Swapped but nothing changed.
The LM1 also in the same order, should I swap them too?

[Péter Fodor]

Considering the traces I think the LM1 is in the correct order.
Here is a picture from the other of the board.

[Péter Fodor]

I tried again to inspect the board with replaced battery and found a very hot components on it.
After it cooled down tested it with IPA and reconnect quickly turned out that is a LTH9 IC Battery Management chip, 600mA single cell Li-Ion Charger.
Can it be hot because I've tested it with Li-Pol battery 3.7V 500mA?
Or because it is faulty?

If it should be replaced I cannot find any page where I can order replacement.

I have found LTH7 can it be a good replacement?

[stj]

do you have a datasheet for the lth9?
i bet they are on aliexpress

[Péter Fodor]

do you have a datasheet for the lth9?
i bet they are on aliexpress

This one I have found.

[Péter Fodor]

I've ordered LTC4045 chips from Aliexpress, as it was an alternative as I see.
Replaced the chip, but no luck.
After replacement put it on charger and showed 40 mA with 0.0 V on the battery. But later the current goes up to 400-500mA, after an hour of wait checked again the battery and it was on 4.0V
I've thought this solve my problem, but the controller still not power on with fully charged battery not even from USB.
What should I check?

[stj]

trace from the battery - it must go to a microcontroller - maybe through a regulator.
and it may go through an inductor or diode that may be bad

[Péter Fodor]

As I measured from the battery, I have found that diode (HSL, D5) cannot measure any voltage at the output. And seems like it has a little crack or I missed It?

If this is the problem, then I cannot find any component like this on Aliexpress or anywhere else.

[stj]

try a 1a rectifier like a 1n4007 just tacked across the pads and see if it works
HS is a 1a rectifier