How To Use Multi-meter and How To Find Faulty in Schematics - Logic Board Repair Foundation Course 

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We are preparing a technical maintenance teaching video，will be more detailed

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@@CINOTechnology ✨ congratulations may god bless you abundantly 🥰may all ur dreams come true ❤️...I need help wanted to know about mother board can we repair it if it drained in swimming pool (S10) ..can we get our data back

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If the VPH_PWR is pulled down by 0.3V, look for current leakage by connecting it to the DC power supply. Finding current leakage is difficult because all the capacitors, diodes and Ics on the VPH_PWR line may cause leakage. However, there are two circuits that most likely to cause current leakage. First, it is necessary to confirm whether the DC power supply voltage is VPH_PWR or VBAT. The simplest method is to adjust the DC power supply voltage to within 2.8V, if the DC power supply voltage is lower than 2.8V, then the leakage is VPH_PWR line leakage and vice versa. Search VPH_PWR or VBAT on the circuit diagram, you can get all the circuits related to it. The current leakage fault will be fixed, and the not turning on faulty also will be fixed.

@@CINOTechnology Thank you for your reply. Please answer these questions: 1; You say:"First, it is necessary to confirm whether the DC power supply voltage is VPH_PWR or VBAT." Do you mean if input voltage to POWER CONTROLLER is VBAT or already VPH_PWR ? 2:You say:"The simplest method is to adjust the DC power supply voltage to within 2.8V, if the DC power supply voltage is lower than 2.8V, then the leakage is VPH_PWR line leakage and vice versa." Do you mean I set 2.8V on power supply and measure if there is still leakage. if so VBAT path problem. THen I set lower than 2.8V on power supply and measure again if there is a leakage.If so then VPH_PWR path problem? Thank you very much for help.

@@ladbla1752 1. VBAT and VPH_PWR always exist no matter the phone power on or off, as long as they are connceted with DC power. VPH_PWR is the system power supply converted from VBAT by PMIC. 2. When the phone battery voltage VBAT is lower than 2.8V, the circuits that need direct supply from VBAT will stop power supply due to insufficient voltage, but VPH_PWR still need power supply from VBAT. Therefore, when the 2.8V VBAT voltage is connected, PCB leakage is tantamount to VPH circuit leakage, and vice versa, or both of them have current leakage

@@CINOTechnology Thank you for explanation. To be sure I understand: 1.PMIC needs about 2.8V ( VBAT) to provide VPH_PWR. Correct? 2.When voltage from the laboratory power supply is lower than 2.8V, and there is still leakage, that means the leakage is on VBAT path - because PMIC that creates VPH_PWR does not work at such low voltage. Correct? 3. When voltage from the laboratory power supply is higher than 2.8V, and there is leakage there can be leakage on VBAT or VPH_PWR. But if I already tested with lower 2.8V and there was no leackage, now it means the leakage on VPH_PWR path.Correct? Thanks for your time and help.

there is a software named ZXW

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ZXW

zxw

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Clock Signal. Consider it as a signal to control your phone's clock.

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It should be this one: www.cinomall.com/products/atten-ms-300-3-in-1-combination-hot-air-gun-desoldering-station-dc-power-supply-maintenance-system

@@CINOTechnology Hi sir how much will it cost me to have this tool...im from South Africa

This one is a good choice : www.cinomall.com/collections/tools/products/digital-multimeter-fluke-17b

We know nothing about indonesia language sorry bro/(ㄒoㄒ)/~~

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@@CINOTechnology I want contact you.

@@aniledirisinghe2767 CINO Technology WhatsApp +86 13410892094