Service manual

35
LC-20B8U-S
LC-20B9U-S
LC-20B9U-SM
Pin No. Pin Name I/O Pin Name Function
1 P96/ANEX1/Sout4 O
2 P95/ANEX0/CLK4 O
3 P94/DA1/TB4in I PC-H PC signal HS frequency judgment
4 P93/DA0/TB3in I D_FIL Component filter switching DA
(No function)
5 P92/TB2in/Sout3 I PC-V PC signal VS frequency judgment
6 P91/TB1in/Sin3 I CSYNC Composite sync signal
7 P90/TB0in/CLK3 I IREM1 Remote control signal
8 BYTE I BYTE Connected to GND
9 CNVss I CNVss Connected to GND (connected to Vcc1 for CNVSS at flash write)
10 P87/Xcin I Xcin 32kHz quartz oscillator (for clock count)
O P87 (No function)
11 P86/Xcout O Xcout 32kHz quartz oscillator (for clock count)
O P86 (No function)
12 RESET I RESET Microprocessor reset at "L"
13 Xout O Xout System clock output
14 Vss I Vss GND
15 Xin I Xin System clock input
16 Vcc1 I Vcc1 VDD (+3.3V)
17 P85/NMI I NMI (Connected to Vcc1 for NMI at flash write)
18 P84/INT2 O
19 P83/INT1 I PSWin Main power monitor
20 P82/INT0 I VSYNC VSYNC signal input
21 P81/TA4in O RS_POWER RS, DS control
22 P80/TA4out O AC_Ctrl AC adaptor power consumption control
23 P77/TA3in O DAC1CS Gradation control IC chip select
24 P76/TA3out O
25 P75/TA2in O
26 P74/TA2out O
27 P73/CTS2_/RTS2_/TA1in I/O SDA2 Serial data line 2 for I2C bus 2 system
28 P72/CLK2/TA1out I/O SCL2 Serial clock line 2 for I2C bus 2 system (EEPROM, AV SW(J), BS TUNER)
29 P71/RxD2/SCL2/TA0in/TB5in I/O SCL1 Serial clock line 1 for I2C bus 2 system (others, AV SW(not J))
30 P70/TxD2/SDA2/TA0out I/O SDA1 Serial data line 1 for I2C bus 2 system
31 P67/TxD1/SDA1 O TxD (TxD at flash write)
32 P66/RxD1/SCL1 O RxD (RxD at flash write)
33 P65/CLK1 O SCLK (Clock input at flash write)
34 P64/CTS1/RTS1/CTS0/CLKS1 O BUSY (Busy output at flash write)
35 P63/TxD0/SDA0 O MPWEL Data signal input for DVP 4-line serial (MPWEL)
36 P62/RxD0/SCL0 I MPOE Data output signal for DVP 4-line serial (MPOE)
37 P61/CLK0 O MPWEH Clock for DVP 4-line serial (MPWEH)
38 P60/CTS0/RTS0 O
39 P57/RDY/CLKout O MAINSW LED power control
40 P56/ALE O
41 P55/HOLD I POWin(EPM) DC/DC start detect (connected to Vss for EPM at flash write)
42 P54/HLDA I(O) L_ERR Fluorescent lamp error detect
43 P53/BCLK O S IN/OUT Audio input/output select
44 P52/RD O COMP AV selector switch
45 P51/WRH/BHE O TIMER(RLED) On timer LED control (power RLED control for overseas destinations)
46 P50/WRL/WR I MRDY(CE) I2C bus open connection detect (connected to Vcc2 for CE at flash write)
47 P47/CS3 O LEDPOW(GLED) Power LED control (common with sub-power control in Japan)
(power GLED control for overseas destinations
1-2. Pin Functions