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Thank you so much sir

please tell me why any microcircuit like sound, wifi, network needs not only vph but also low voltage 2.8, 2.6 and so on

Thank you very much ❤❤❤ impressive

Thank u sir

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Maybe EDL point shorting that why pm ic get some voltage through to the vph line? 🤔🤔

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Thank you very much

Hi good stuff. I believe when the battry connects, there will be an issue on the battry id line. Once power button press that's why it does not generate the buck voltages. Once connect the charger vbus line will activate and power ic generates the buck voltages. Once usb connects the charging symbol has to show on display. So phone has to do some work I mean for example power shoud go to display, cpu has to do some calculation to show precentage, ram should founction, for that reson every componets should recive the voltages that is why when connect charger buck voltages will generate.

Great job

Very informative tutorials. Learnt lots of things by watching your video series. To answer the question, there might be short in battery line means short between battery connector and charging ic or line disconnection between battery pin and charging ic or battery id line issue. fails to create divider circuit. Once the battery connect, battery id line should get 0.9v. If not getting the 0.9v CPU not detect the battery connected. So buck voltages will not generate. Once charger connects cc1 / cc2 lines will activate with charging ic, CPU reads the info through sdlc and sdac then vph generates through the vbus line,power ic enables the buck voltages.

Thank you very much ❤ keep posting more videos

You are Soo amaizing

Well detailed, thanks very much sir

Great content. Please my Borneo schematic v7 13 patch compatible search is not working. What do i do boss? Any guideline will be much appreciated

A very good explanation of the best charting programs ❤❤❤❤

This is a deep knowledge,, sometimes VBAT cannot activate Bulk and LDO because it is protected by divider circuit but Vbus is direct... VBAT requires power ON

Love this channel english nize❤❤

You the greatest teacher thank you sir❤❤

You the best sir

You the best❤

You the best sir ❤

Deep knowledge sir

I’m watching the video through a translator and perhaps I misunderstood the question, if you asked why the phone won’t turn on when the battery is low, but if you connect the charging cable it will work, I think that to turn on the power ic you need a voltage of 3.7-4.2 and if the battery is low it won’t work, and when we connect the charging cable, the inductor on the vph line, through the generation of a PWM signal from the charging chip, will grow from 3.7 to 4.2 and then the power ic will be able to turn on additional lines if I wrote it wrong, tell me

am going to watch all your vids in the name of allah, good chip level repair courses. thanks.

One of Faults there is disconnection to battery line to charging IC so when battery is installed charging ic dont have input voltage to generate vph so when connect to charger its works correct me if im wrong great content keep up

English full course available?

Power ic generated secondary lines because all the ldo sections are control by power ic....

Dp dm line in fix in cc connector..... Its go to cpu... Cpu sense or check (power ic out put lines ) Vbat line la not fix dp and dm

Sir realy i dont know the answer for that question...... I am very interest for know this amswer.... And one more request.... Dont speak fastly..... I cant not understand sir.... Just speaak slowly.... Thank u sir.... Congrats for ur work.... U are a mentor....❤

Because the charger VBus enters the DC TO DC, the PMID confirms that the 5V of the VBUS are really present, the DC TO DC activates the VPH from the bistrack. The HPV enters the PMIC and the DC TO DC also sends the VSYS OK which allows the PMIC to create the Buck Voltage and LDO Voltage. If the phone is dead the DC TO DC cannot create the HPV and the VSYS OK, for this lesson it is the Fault N which allows the second PMIC to create the buck and the LDO

Because the charger VBus enters the DC TO DC, the PMID confirms that the 5V of the VBUS are really present, the DC TO DC activates the VPH from the bistrack. The HPV enters the PMIC and the DC TO DC also sends the VSYS OK which allows the PMIC to create the Buck Voltage and LDO Voltage. If the phone is dead the DC TO DC cannot create the HPV and the VSYS OK, for this lesson it is the Fault N which allows the second PMIC to create the buck and the LDO

Probably battery is blocked for safety to not get drained.

Bro i am from Bangladesh.... Keep your video in English. It follow international standard. Love from Bangladesh ❤

Vbus makes vph and the vbat doesn't because the vbat side of the dc2dc ic is faulty (faulty dc2dc ic)

Great video sir. The reason why it will generate bulk and LDOs voltages when plug in charge but no voltages when power button is pressed, is because the vbus produces direct current while the battery will only produce direct current when the Dc-Dc ic and pm ic are okay.

To the question according to the bq ic tutorial. It's because of power good line, this line active only when charger is connected.

when can we expecting secondary line short solution?

I think it because there's problem in the vbat line or the vbat line is shorting.

You are doing a wonderful job sir please keep it up

Power key circuit faulty

When a charger is connected we get always 5v . And the pcb is designed always on for charging section, vph + system ok generated so pm gets activated, but when battery inserted, 1st condition it must be charged to certain level to activate vph, then dctodc ic should detect or sense battery through thermal and id lines, if the voltage level is ok then it produces vph ,power on voltage generated and when pressed sy ok sent, then pm gets activated and secondary voltages generated

You are genius and keep it up 👍

When charger connect with phone then dm, dp lines sense cpu and charging ic also switching the voltage through we know from boot cap and vph from coil and charging section active in power ic, so buck voltage produce power ic when charger connected and without battery no charging section active in power ic only vph line is active and goes to power ic when we press power button then voltage ground and powee ic active then produce buck voltage that i know but you are master of this line i am not and i am 57yrs old and you are master and genius person of this line from my side God bless you 🙏

Sir good knowledge ❤❤good teaching