Tablet Battery what is White, Red, Black cable, can we connect charge cable direct to motherboard

i have purchased both TP4056 and LM2596 and i was about to use TP4056.

But then i came to know that TP4056 can not be used to charge and load at the same time, so it wont serve the purpose

I will go with LM2596

Is there any other module that can be used, instead of 4056, some thing that can charge and load at the same time with safety feature...
Power bank circuit of mi power bank is designed that way !
 
Ok so I removed the battery and connected the LM2596 module buck converter to the motherboard..

I get 3.7v to the module and motherboard.. but tablet is not starting up.. the red LED is blinking in tab.. which means Tablet is indicating a low battery level...

Is there any way I can fool tablet to think battery is connected..

  • IMG_20210929_155807.jpg
 
so i removed the circuit from battery and it looks like a ling thin circuit, i connected the circuit to the board again without battery and connected the power cable to + and and -

but again nothing works, i checked with the multimeter that circuit is getting 3.7 volt but from there to motherboard, no power.

why

circuit is working fine, then i connected the power cable directly to the motherboard without the circuit, it is getting 3.7 and i increased it to 4.3 volt but still no power

i will try with new usb cable, again
ok, so removed the circuit from the battery and it look like this one


qRIQTDO.jpg



i tried several other ways, like connecting the charger output directly to the motherboard, positive and negative, but no sucess

then i tried a 10k resistor and 10k thermistor and connected negative and white , ..

see

here i connected 10k resistor


JCQZ5m2.jpg



i tried with 10k thermistor


Nt3kYqu.jpg



then i connected the circuit back to its original connection but wihout the battery and sent power from charge to positive and negative on circuit


lxOAOFm.jpg



i tried the buck converter also,

but its maximum output i could increase to 4.3 volt only becuae it was connected to 5V charger


6rzw7ff.jpg



what else i can try

i think i will change the power cable

using a buck converter with 5V charger is limiting the output to 4.39V max

i am thinking to connect 5V directly from the charger with a new thick cable ?

any suggestion
 

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