Hitachi C20 Lc880snt Service Manual

- 25 -PRINTED CIRCUIT BOARD
Tuner Board (Top Side) 

- 27 -BLOCK DIAGRAM 

- 28 -WIRING DIAGRAM 

- 31 -INFORMATION OF ICS
IC MC78M05 D-PAK
Pin No. Pin Name        Description Pin No.Pin Name     Description
1 Input Output Voltage      3Output Output Voltage
2 GND
IC LM1117DTX-3.3 TO-252
Pin No. Pin Name        Description Pin No.Pin Name     Description
1 Input Output Voltage      3Adi/GND Output Voltage
2 Output
IC LM1084ISX-3.3 TO263
Pin No. Pin Name    Description Pin No.Pin Name     Description
1 Input Output Voltage      3Adi/GND Output Voltage
2 Output
IC LM2596S-5.0 TO-263
Pin No. Pin Name...

- 32 -IC FSAV330 QS0P16
Pin No.
Pin Name        Description Pin No.Pin Name     Description
1 S      93A
2 1B1    103B2
3 1B2    113B1
4 1A    124A
5 2B1    134B2
6 2B2    144B1
7 2A    15OE
8 GND    16VCC
IC 74LCX14 S0IC14
Pin No. Pin Name        Description Pin No.Pin Name     Description
1 I0 Inputs      8O3 Outputs
2 O0 Outputs      9I3 Inputs
3 I1 Inputs    10O4 Outputs
4 O1 Outputs    11I4 Inputs
5 I2 Inputs    12O5 Outputs
6 O2 Outputs    13I5 Inputs
7 GND Inputs    14VCC
IC SST39SF020A PLCC32
Pin...

- 33 -INFORMATION OF ICS
IC GM5221 PQFP-208 (DVI Input Port)
Pin No.    Pin Name Description
   126 VDD_RX0_1.8 VDD (1.8V) for TMDS input pair 2. Must be bypassed with external
capacitor to GND_RX0
   127 AGND_RX0 Analog GND for TMDS input pair 0. Must be connected directly to the
analog ground plane.
   128 RX0+ TMDS input pair 0
   129 RX0- TMDS input pair 0
   130 AVDD_RX0_3.3 Analog VDD (3.3V) for TMDS input pair 2. Must be bypassed with
capacitor to AGND_RX0
   131 AGND_RXC Analog GND for TMDS input...

- 34 -IC GM5221 PQFP-208 (Analog Input Port)
Pin No.
   Pin Name Description
   141 AVDD_BLUE_3.3Analog power (3.3V) for the blue channel. Must be bypassed with
capacitor to AGND_BLUE pin on system board.
   142 BLUE+ Positive analog input for Blue channel.
   143 BLUE- Negative analog input for Blue channel.
   144 AGND_BLUE Analog ground for the blue channel. Must be directly connected to the
analog system ground plane.
   145 AVDD_GREEN_3.3 Analog power (3.3V) for the green channel. Must be bypassed...

- 35 -INFORMATION OF ICS
IC GM5221 PQFP-208 (System Interface)
Pin No.    Pin Name Description
81 GPIO0 General-purpose input/output signals
82 GPIO1 [Bi-directional, Schmitt trigger, 5V-tolerant]
83 GPIO2
84 GPIO3
85 GPIO4
88 GPIO5
89 GPIO6
90 GPIO7/IRQin General-purpose input/output signals [Bi-directional, Schmitt trigger, 5V-
91 GPIO8/IRQout tolerant] or OCM interrupt and chip status.
92 GPIO9/SCL General-purpose input/output signals [Bi-directional, Schmitt trigger, 5V-
93 GPIO10/SDA tolerant] or...

- 36 -INFORMATION OF ICS
IC GM5221 PQFP-208 (LVDS Display Interface)
Pin No.    Pin Name Description
    11 AVDD_LV_E_3.3 Digital Power for LVDS outputs. Connect to digital 3.3V supply.
    12 AVSS_LV_E Ground for LVDS outputs.
    13 CH3P_LV_E
    14 CH3N_LV_E
    15 CLKP_LV_E
    16 CLKN_LV_E
    17 CH2P_LV_E
    18 CH2N_LV_E
    19 CH1P_LV_E
    20 CH1N_LV_E
    21 CH0P_LV_E
    22 CH0N_LV_E
    23 AVSS_LV_E Ground for LVDS outputs.
    24 AVDD_LV_E_3.3 Digital Power for LVDS outputs. Connect to...

- 37 -INFORMATION OF ICS
IC GM5221 PQFP-208 (TTL Display Interface)
Pin No.    Pin Name Description
    11 AVDD_LV_E_3.3 Analog Power for TTL outputs. Connect to analog 3.3V supply
    12 AVSS_LV_E Ground
    13 ER0 Red channel bit 0 Not used.
    14 ER1 Red channel bit 1 Not used.
    15 ER2 Red channel bit 2 Red channel bit 0
    16 ER3 Red channel bit 3 Red channel bit 1
    17 ER4 Red channel bit 4 Red channel bit 2
    18 ER5 Red channel bit 5 Red channel bit 3
    19 ER6 Red channel bit 6 Red...