Service manual
Table Of Contents
- VIZIO L42HDTV10A,GV42L_HDTV Service Manual
- 01-FEATURES
- 02-SPECIFITION
- 03-ON SCREEN DISPLAY
- 04-FACTORY PRESET TIMINGS
- 05-PIN ASSIGNMENT
- 06-MAIN BOARD I/O CONNECTIONS
- 07-THEORY OF CIRCUIT OPERATION
- 08-WAVEFORMS
- 09-TROUBLE SHOOTING
- 10-BLOCK DIAGRAM
- 11-SPARE PATRS LIST
- 12-1COMPLETE PARTS LIST_FOR L42 HDTV10A
- 12-2COMPLETE PARTS LIST_FOR GV42L HDTV
- MAIN BOARD CIRCUIT DIAGRAM_FOR L42 HDTV10A
- MIAN BOARD CIRCUIT DIAGRAM_FOR GV42L HDTV
- MAIN BOARD PCB LAYOUT_FOR L42HDTV10A(LG/AUO)
- MAIN BOARD PCB LAYOUT_FOR GV42L HDTV_LG
- ASSEMBLY EXPLOSION DRAWING_FOR L42HDTV10A_AUO
- ASSEMBLY EXPLOSION DRAWING_FOR L42HDTV10A_LG
- ASSEMBLY EXPLOSION DRAWING_FOR GV42L HDTV_LG
CONFIDENTIAL – DO NOT COPY
Page 7-6
File No. SG-0198
5. Microprocessor interface
When power is supplied and power key is pressed then the rest circuit lets Reset to low state that
will reset the MTK8202 to initial state. After that the Reset will transits to high state and the
MTK8202 start to work that microprocessor executes the programs and configures the internal
registers. The execution speed of CPU is 162 MHz.
1. The I/O ports are configured as follows：
Pin name Function Type Description
AD17 PWM Output Backlight Adjust
R3 GPIO2 Output Panel on/off
V1 GPIO7 Output System power
Y2 GPIO16 Output LVDS on/off
R4 GPIO3 Output ATSC POW on/off
AD22 IOSCL Input / Output SDA
AV22 IOSDA Input / Output SCL
W3 GPIO13 Output HDMI Switch Select
Y4 GPIO_18 Output MT8293 Reset
W4 GPIO_14 Output MT8293 acknowledge to player
B19 ADC_IN0 Input Key ADC detection
L4 IR Input IR Receiver
Y1 GPIO_15 Output SYSTEM EEPROM Read / Write
T2 GPIO_23 Output LED Backlight
L2 RESETn Input MT8202 RESET
R2 GPIO_1 Output DTV & HDMI Select PIN
T4 GPIO_4 Output DTV & ATV Select PIN
2. PIP/POP HARDWARE LIMITION: