Service manual
18
LC-20B4U-S
LC-20B4U-B
Pin No. Name of Terminal I/O Name of Function Function in Normal Times
1 VHOLD1 I Vhold For CLOSED CAPTION
2 HLF1 I/O HLF For CLOSED CAPTION
3 P94/DA1/SCL3/RXD2 O L N.C.
4 P93/DA0/SDA3/TXD2 O L TIMELED For LED lighting in timer operation
5 P92/TB2IN/DIGR0 O L N.C.
6 P91/TB1IN I Hi-Z CSYNC Composite sync signal
7 P90/TB0IN I Hi-Z IREM1 Remote control
8 BYTE O BYTE GND
9 CNVSS O CNVss GND ("H" at the time of flash writing)
10 P87/XCIN/DIGG0 I Xcin 32 kHz oscillation input
11 P86/XCOUTDIGB0 O Xout 32 kHz oscillation output
12 RESET I RESET Reset state at "L"
13 XOUT O Xout Microprocessor oscillator connection
14 VSS I Vss GND
15 XIN I Xin Microcomputer oscillator connection
16 VCCI I Vccl Power supply (3.3 V)
17 OSC1/OSCHLF I OSCin Clock input for OSD
18 OSC2 O N.C.
19 P83/INT1 I Hi-Z PSWin
Power supply monitor ("L" at the time of power-ON)
20 P82/INT0 O L N.C.
21 OUT1 O L BLK OSD blanking output
22 OUT2 O L Not Used
23 P77/HC1 O L DAC1CS Gray scale control IC chip selection
24 P76/TA3OUT O L N.C.
25 P75/HC0 O L N.C.
26 P74/TA2OUT O L N.C.
27 P73/CTS2, RTS2 I Hi-Z MRDY I
2
C bus open connection selection input
28 P72/SCL2/CLK2 I/O Hi-Z SCL2 I
2
C bus serial clock line 2 (EEPROM)
29 P71/SCL1/RXD2 I/O Hi-Z SCL1
I
2
C bus serial clock line 1 (UV TUNER, VPC, MSP, 3D YC, DPS)
30 P70/SDA1/TXD2 I/O Hi-Z SDA1 I
2
C bus serial data line 1
31 P67/SDA2 I/O Hi-Z SDA2 I
2
C bus serial data line 2
32 R/DIGR1 O L OSD_R R signal output of OSD
33 G/DIGG1 O L OSD_G G signal output of OSD
34 B/DIGB1 O L OSD_B B signal output of OSD
35 P63/TXD0 O SUBDout (T x D at flash WRITE)
36 P62/RXD0 I SUBDin (R x D at flash WRITE)
37 P61/CLK0 I SCLK Clock input at flash WRITE
38 P60/CTS0/RTS0 O BUSY Busy output at flash WRITE
39 P57/RDY/CLKOUT O MAIN SW
Main SW ON "H"/OFF
"
L" (LED power supply control)
40 P56/ALE O L N.C.
41 P55/HOLD I EPM "L" at flash WRITE
42 P54/HLDA I Hi-Z L_ERR
Fluorescent lamp error detection processing (Error at "H")
43 P53/BCLK O L S IN/OUT Audio input/output selection (Audio output at "L")
44 P52/RD O L PC/VD
D2 (& PC) mode selection (D2 or PC mode at "L")
45 P51/WRH/BHE O L N.C.
46 P50/WRL/WR I CE "H" at flash WRITE
47 P47/CS3 O L AV1/AV2 AV selector SW
48 P46/CS2 O L TV/AV AV selector SW
49 P45/CS1 O L N.C.
50 P44/CS0 O L VSHOUT Panel gate driver voltage control
Pin functions of microprocessor IC (IC2001) RH-iXA620WJZZQ
* Except for AUTO CLOCK being in operation when the power is OFF
In Power Saving*
Within 1 min. after
Power-OFF by R/C Unit