It refers to the process that after the mobile phone is turned on, press the on/off key for about 2 seconds, and the mobile phone enters the self-check and searches the network. When the logic function is normal, the display screen begins to display various prompt information until the signal strength and battery charge are finally displayed. Some mobile phones display time, network and other signals, and the network access indicator light turns green and keeps flashing. After a few seconds, the backlight goes out.

Second, close

In the reverse process of turning on the phone, press and hold the ON/OFF key for 2 seconds, and the phone will enter the shutdown procedure. After that, there is no information displayed on the mobile phone screen, and all network access signs and background lights are turned off.

Three. functional mode

When repairing, it is often said that the mobile phone is in working state, which means that the mobile phone is in receiving or transmitting state (when the mobile phone is set to test state, the mobile phone can be in receiving or transmitting state alone).

Four. Hold state

The mobile phone is not in use, but it has been on.

Fifth, power failure.

After the phone is turned on, it will automatically turn off without pressing the on/off key, sometimes it is also called power off, also called automatic power off or automatic power off.

The intransitive verb leaks electricity.

After the mobile phone is turned on by DC regulated power supply, it is not turned on, and the ammeter pointer indicates the current. Under normal circumstances, the indicated value of ammeter is 0mA.

Seven, the mobile phone shows weak current

Install a new rechargeable battery on your mobile phone. After the phone is turned on, the user is prompted that the battery voltage is not enough. At the same time, the battery indicator on the display screen keeps flashing and gives an alarm sound. This phenomenon is called weak current on mobile phones.

Eight, don't access the network.

When the mobile phone is not connected to the Internet, it means that the mobile phone cannot access the GSM network, that is, there is no network information and no indication of signal strength value on the display screen of the mobile phone. Under normal circumstances, after the mobile phone is connected to the network, the network name is displayed on the display screen, and the network connection indicator flashes green. If there is no network, the network indicator will flash red, so the light will not light up when there is no network access.

Nine, drop the signal.

Signal drop means that the signal intensity on the mobile phone display varies widely, for example, from 5 grid intensity to 2 grid intensity, 1 and then to 5 grid intensity. This phenomenon is also called signal instability. When the mobile phone presses the transmit key, the signal strength becomes zero or changes greatly. This phenomenon is called signal.

X. virtual welding

Refers to the poor contact between the pins of components in the mobile phone and the solder joints of the printed circuit board.

XI. welding

The method of re-welding or re-welding a little tin on the pin of the component is called repair welding, sometimes called enhanced welding.

Twelve. Card insertion

Inserting a SIM card into the card holder is called inserting a card.

Thirteen. Can't read cards

It means that the mobile phone cannot read the information on the card, and the mobile phone prompts to insert the card or check the card information on the screen.