Contn:
[3]
LOGIC BOARD TROUBLESHOOTING [50"]
Contd:
[3]
LOGIC BOARD TROUBLESHOOTING [50"]
- Y-Connector > The connector to output the Y-Drive Board control signal.
- LVDS connector > The connector to receive LVDS-encoded RGB, H, V, DATAEN and DCLK inputs from the Video Board.
- Power connector > The connector to receive Power [5V] for the Logic Board.
- X-Connector > The connector to output the X-Drive Board control signal.
- ASIC Chip > The main processor that generates and outputs the Logic Drive signal and the address data.
- DDR memory for MENCON > The memory to save the Address output data to.
- SDR memory for Frame Delay > The memory to save FCR-applied data to.
- JTAG Port > The port for uCOM communication.
- Start Screen Option pin > Select the NTSC / PAL Mode Rolling Option for the initial screen (CN2007)
- MICOM Loading 5 pin connector or UART Communication Connector > The connector to load the MICOM drive program by connecting GA-WRITER. This connector is also used to load and adjust 512k data and to connect the key-scan board.
- Flash Memory > The Flash Memory to save the MICOM data to.
- Buffer Connection connector > The connector to output the address data and the control signal to the E-buffer board at the bottom.
- Operation LED > The LED indicating that the sync and clock signals have been received normally by Logic Board. [Normal status: It blinks at 0.5 second interval].
- Buffer Connection Connector > The connector to output the address data and the control signal to the F-Buffer Board at the bottom.
- V-TOGG > The V-Sync Output Pin.
DRIVE BOARD TROUBLESHOOTING CHART
Condition
|
Description
|
Related board
|
No voltage output
|
Operating voltage doesn’t exist.
|
Power supply unit
|
No display
|
Operating voltage exist, but an image doesn’t exist on
screen.
|
Y-MAIN, X-MAIN, Logic Main, Cable.
|
Abnormal display
|
Abnormal image [not open or short] is the no screen.
|
Y-MAIN, X-MAIN, Logic Main.
|
Sustain open
|
Some horizontal lines don’t exist on screen
|
Scan IC, FPC of X/Y.
|
Sustain short
|
Some horizontal lines appear to be linked on screen.
|
SCAN IC, FPC of X / Y.
|
Address open
|
Some vertical lines don’t exist on screen
|
Logic main, Logic buffer, TCP.
|
Address short
|
Some vertical lines appear to be linked on screen
|
Logic Main, logic buffer, TCP
|
