Waveforms Of Major Check Point; Crystal; Flash Memory - LG SN4A Service Manual

WAVEFORMS OF MAJOR CHECK POINT

1. CRYSTAL

1
FIG 1-1. X501 (27 MHz)
2
FIG 1-2. XA501 (24.576 MHz)

2. FLASH MEMORY

VCC
3
CS#
4
CLK
5
DO
6
FIG 2. VCC, CS#, CLK, DO
C563
15pF
C600
C620
DGND
4
4.7K
SF_CS
SF_DO
6
R109
Copyright © 2021 LG Electronics Inc. All rights reserved.
3-27
1
Close to IC501 R506
X501
1M NC
R505
4 FLOAT 3
ININ/OUT
1 IN/OUT 2
FLOAT 1.8K
C564
27MHz
15pF
DGND
2
X600 R600
2.2K
24.576MHz
8pF
4 FLOAT 3
INPUT/OUTPUT
R601
1 INPUT/OUTPUT 2 1M
FLOAT
8pF
3.3VA
3
IC102
R106 R108
R107
4.7K 4.7K
1 8
VCC
CS#
2 7
HOLD#
SO
3 6
WP# SCLK
4 5
VSS SI
NC
DGND
Only for training and service purposes.
5
DGND
SF_CLK
SF_DI