NEC NEC MultiSync LCD1550X LCD1550X LCD1550X, Service Manual

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H, V C / S S / G H, V C / S S / G
H
V
C / S S / G
H H
V V
C / S
H
V
H V C / S S / G H, V H, S / G V, C / S V, S / G C / S, S / G H, V, S / G V, C / S, S / G
1 2 3 4 5 6 7 8 9
10 11
1 2 3 4 5 6 7 8 9
10 11
V
S / G C / S S / G S / G
V
C / S
S / G S / G
4
C
1
4
C
2
4
C
3
LPF
LPF
LPF
LPF
D-SUB connector
V2 H2 G2
DVI-I connector : (analog Ch)
V1
H1
G1
AV2
AH2
AV1 AH1
ASIC
SEL_HS2_GS2 C / S_H2 (TB0) C / S_V2 (TA3)
C / S_V1 (TA4)
S / G_H2 (TB2)
SEL_HS1_GS1
C / S_H1 (TB3) S / G_H1 (TB4)
Sepa
Sepa
Explanatory table of analog input synchronizing signal presence judgment circuit
Compatible synchronizing signal
D-SUB connector DVI-I connector : (analog Ch)
All combinations of input synchronizing signals (11 patterns)
Microcomputer
SEL_HS1_GS1 is the input signal switching switch which selects Separate-H, C / S or S / G at Ch1. SEL_HS2_GS2 is the input signal switching switch which selects Separate-H, C / S or S / G at Ch2.
Input signal judgment conditions
Input judgment
signal
Input synchronizing signal
Measurement by ASIC (Maurice)
AH (accurate H measurement)
AV (accurate V measurement) (V measurement at H, V)
Measurement by microcomputer (M16C)
C / S_H (TB pulse cycle measurement mode) (H measurement at H, V or C / S)
S / G_H (TB pulse cycle measurement mode) (H measurement at S / G)
C / S_V (event counter) (V measurement at C / S)
Input signal judgment results
No input signal (only H) No input signal (only V) Input signal present (C / S) Input signal present (S / G) Input signal present (H, V) Input signal present (S / G) Input signal present (C / S) Input signal present (S / G) Input signal present (C / S) Input signal present (H, V) Input signal present (C / S) No input signal
Combination other than above four signal inputs
: Order of priority (C / S > H, V > S / G)