1

00:00:00,166 --> 00:00:03,233

Hello everyone, today we are going to learn what is the power supply

2

00:00:04,133 --> 00:00:09,633

Power supply is a voltage that can output current, and the output current is relatively large

3

00:00:10,666 --> 00:00:15,900

In English it is called POWER, abbreviated as PWR

4

00:00:16,833 --> 00:00:21,566

This voltage may not be directly raised or lowered during mainboard operation

5

00:00:22,100 --> 00:00:25,466

Direct pull low, equivalent to a short circuit

6

00:00:28,033 --> 00:00:30,833

Under normal circumstances high is not allowed

7

00:00:31,333 --> 00:00:37,500

For example, a 3V power supply, we can not connect it to a 19V voltage

8

00:00:38,533 --> 00:00:42,200

Power supply is to provide power for the mainboard to work

9

00:00:43,666 --> 00:00:54,400

The names in the circuit are usually: VIN, VOUT, VCC, VDD, VCCCORE, VCCIO...... , etc.

10

00:00:57,166 --> 00:01:02,166

In Apple's circuit diagram, the power supply is generally started by PP

11

00:01:02,933 --> 00:01:08,733

For example, PP3V3_S4_TBTAPWRSW

12

00:01:08,733 --> 00:01:15,000

is a 3.3V power supply to the V3P3 pin of the U3201 chip

13

00:01:19,300 --> 00:01:25,166

For example, this PPHV_SW_TBTAPWRSW,

14

00:01:25,500 --> 00:01:29,000

which is also a power supply, is powering the chip

15

00:01:29,433 --> 00:01:37,566

And the voltage output by the out pin of this chip PP3V3_RHV_S4, which is also a power supply

16

00:01:40,300 --> 00:01:44,633

In Apple's circuit diagram, the power supply begins with PP

17

00:01:46,466 --> 00:01:51,766

In the circuit, these supplies must not be directly grounded or pulled down

18

00:01:53,500 --> 00:01:57,633

If the power supply is grounded, it will cause a large short circuit

19

00:02:01,166 --> 00:02:03,033

OK, that's the power supply