4.15 Slide on/off Trouble. LG KG291, KG290

4. TROUBLE SHOOTING

4.15 Slide on/off Trouble

TEST POINT

U301

C311

CIRCUIT

SLIDE SW

C311

1u

2V8_VMEM

R343

100K

SLIDE

C312

EVL5M02200

U301

A3212EELLT-T

C313

1u

C314

39p

LGE Internal Use Only - 92 Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

4. TROUBLE SHOOTING

CHECKING FLOW

START

Is there the magnet in the Slide side?

YES

Voltage at pin 1 of U301 = 2.8V?

YES

NO

NO

Place the magnet properly.

Voltage of VMEM at U103

= 2.8V?

YES

Resolder U301

NO

Replace U103

Open Slide.

Voltage at pin 1 of U301

=2.8V

YES

Close folder.

Voltage at pin 1 of U301

= 0V

YES

Does it work properly?

YES

Slide on/off will work properly

NO

NO

NO

Resolder and U301

Replace U301

Change Main board

Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

- 93 LGE Internal Use Only