Sharp LC-20B4U-B, Service Manual

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19
LC-20B4U-S
LC-20B4U-B
Pin No. Name of Terminal I/O Name of Function Function in Normal Times
51 P43/A19 O L REQ Adjusting process
52 P42/A18 O L LED_POW Green by TV power supply LED control at "H", and red at "L"
53 P41/A17 O L SP MUTE 1 Main speaker MUTE
54 P40/A16 O L CVBS/Y CVBS/Y selection (AV selector SW)
55 P37/A15 I Hi-Z HP DET Headphone detection (Headphone at "L")
56 P36/A14 O L SSTBY Speaker standby ("L" at standby)
57 P35/A13 I Hi-Z VSH IN Panel gate driver voltage check (Standby maintained at "H")
58 P34/A12 O L LMUTE Line-out audio MUTE (Audio output MUTE at "H")
59 P33/A11 O L V IN/OUT Image input/output selection (Image output at "L")
60 P32/A10 O L SRESET "L" output at multi-Sound IC (MSP) reset
61 P31/A9 O L N.C.
62 HSYNC I HSYNC Horizontal sync signal for OSD
63 P30/A8 O L N.C.
64 VSYNC I VSYNC Vertical sync signal for OSD
65 P27/A7 O L N.C.
66 P26/A6 O L N.C.
67 P25/A5 O L N.C.
68 P24/A4 O L N.C.
69 P23/A3 O L N.C.
70 P22/A2 O L N.C.
71 P21/A1 O L N.C.
72 P20/A0 O L POWout DC/DC control output
73 P17/D15 I Hi-Z ADPPOW Adaptor ON/OFF input
74 P01/D1 O L DACOUTCON Gray scale control IC for output control (Output at "H")
75 P15/D13 O L N.C.
76 P14/D12 O L N.C.
77 P13/D11 O L N.C.
78 P12/D10 O L MP_DA Gray scale control IC for data output
79 P11/D9 O L MP_CLK Gray scale control IC for clock output
80 P10/D8 O L DDC_RESET "L" output at VPC, G/A, 3DY/C, DPS reset
81 P07/D7 I Hi-Z KEY4 Key input 4
82 P06/D6 I Hi-Z KEY5 Key input 5
83 P05/D5 O L N.C.
84 P04/D4 O L N.C.
85 P03/D3 O L N.C.
86 P02/D2 O L N.C.
87 P01/D1 I Hi-Z POWin DC/DC start detection (Detection at "H")
88 P00/D0 I Hi-Z SSW S terminal by S terminal connection at "L"
89 P107/AN5/DIGR2 I Hi-Z AFT AFT voltage input
90 P106/AN4/DIGG2 I Hi-Z AGC AGC input voltage
91 P105/AN3/DIGB2 I Hi-Z KEY1 Key input 1
92 P104/AN2 I Hi-Z KEY2 Key input 2
93 P103/AN1 I Hi-Z SLOW SW
94 P102/AN0 O L N.C.
95 VHOLD2 I V HOLD2 For CLOSED CAPTION
96 HLF2 I/O HLF2 For CLOSED CAPTION
97 CVIN2 I CVin2 For CLOSED CAPTION
98 TVSETB I TVSETB For CLOSED CAPTION (For test, L fixed)
99 VCCE I VccE Power supply (5V)
100 CVIN1 I CVin1 For CLOSED CAPTION
* 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