JVC AV-56P776 Service Manual page 7

2.4 TECHNICAL INFORMATION
2.4.1 MAIN MICRO COMPUTER (CPU) FUNCTION
Pin Pin name I/O
No.
1 ATSC_RX O Serial communication for ATSC tuner
2 /MICON_V I V. sync for OSD
3 LB_PRO I Low B protect detection [Protection: H]
4 NC - Not used
5 /RST I CPU reset [Reset: L]
6 HDMI_IR I Interrupt request for HDMI [Empty: H]
7 /TEST I Operation test for CPU [+3.3V Fixed]
8 OSD_YS O Ys (blanking) for OSD
2
9 SDA4 I/O I C bus (data) for IC3001
10 SYNC_SEL O Sync select for DIST process
11 A_MU O Audio muting [Muting: H]
12 /MICON_H I H. sync for OSD
13 BBE_SW O BBE control [ON: H]
14 OSDXI - Oscillation for OSD
15 OSDXO - Oscillation for OSD
2
16 SDA2 I/O I C bus (data) for MTS decode
17 AC IN I AC for timer clock
2
18 SCL2 O I C bus (clock) for MTS decode
19 M_US_MU O Audio output muting [Muting: L]
20 VCOI I LPF
21 PDO O LPF
22 /IP_RESET O Reset for DIST [Reset: L]
23 OSD_YM O YM (transparence) for OSD
24 OSD_B O Blue for OSD
25 POW_LED O Lighting for Power/OnTimer LED [Power ON & HIGH: H]
26 OSD_G O Green for OSD
27 OSD_R O Red for OSD
28 VREF I Reference voltage for OSD
29 IP_ERR I AMDP program load error detection [Error: L]
30 IREF I Reference current for OSD
31 COMP I Phase adjust for OSD
32 AVDD I +3.3V
33 CLL I Clamp low level for SUB CCD
34 VREFLS I Reference voltage for SUB CCD
35 SUB_CCD I Composite video for SUB CCD
36 NC - Not used
37 VSS - GND
38 MAIN_CCD I Composite video for MAIN CCD
39 VREFHS I Reference voltage for MAIN CCD
40 CLH I Clamp high level for MAIN CCD
41 VDD I +3.3V
2
42 SCL4 O I C bus (clock) for IC3001
1-6 (No.YA318)
Function Pin
No.
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
Pin name I/O
CLKSW O Not used
ON_TIM O Brightness control for Power/OnTimer LED [Power ON & LOW: H]
CONVER_RXD O Serial communication for convergence control
CONVER_TXD I Serial communication for convergence control
SBT1 I Use for on board writing [Setting: H]
NC - Not used
ATSC_RST O Reset for ATSC tuner [Reset: H]
NC - Not used
OCP I Over current protect detection [Protection: H]
ROTATION_L O Rotation control (left)
ROTATION_R O Rotation control (right)
DC_COTL O Black level DC reproduce control
HDMI_HP O HDMI control [HDCP Error: L]
EDID_WP O EDID data writing protect [Data writing: L]
LIGHT_DET O Photo sensor for DIGITAL-IN illegal copy protection
/LOB_POW O Low-B power control [Power on: L]
COMPLINK I/O Not used
/POWERGOOD I Not used
MECA_SW I Machine SW interrupt detection [SW Pushing: L]
/MAIN_POW O Main power control [Power on: L]
NC - Not used
/B1 POW O B1 power control [Power on: L]
C/N AFC1 I Main AFT voltage for tuner
X-RAY_M I X-ray protect detection [Protection: under 2.2V]
SPRT I/O Not used : Sprit protect detection [Error: L]
KEY2 I Front key scan voltage (CH+ / VOL+ / VOL-)
KEY1 I Front key scan voltage (CH- / MENU / SUPER FOCUS)
2
SCL1 O I C bus (clock) for EEP-ROM (IC1803)
SDA1 I/O I 2
C bus (data) for EEP-ROM (IC1803)
REMO I Remote control
POW_DET O Power detection for ATSC tuner
VSS - GND
OSC2 O 4MHz oscillation for system clock
OSC1 I 4MHz oscillation for system clock
VDD I +3.3V
2
SCL0 O I C bus (clock) for general
VOUTENB O Boost for tuner
2
SDA0 I/O I C bus (data) for general
NC - Not used
ATSC_TX I Serial communication for ATSC tuner
NC - Not used
P_MU O Picture muting [Muting: H]
Function