Friday, October 05, 2012

SAMSUNG PL42A450P1XZD PL-50A450P1XZD LOGIC BOARD TROUBLESHOOTING

Contn:
                                            [3]
                             LOGIC BOARD TROUBLESHOOTING [50"]
  1. Y-Connector > The connector to output the Y-Drive Board control signal.
  2. LVDS connector > The connector to receive LVDS-encoded RGB, H, V, DATAEN and DCLK inputs from the Video Board.
  3. Power connector > The connector to receive Power [5V] for the Logic Board.
  4. X-Connector > The connector to output the X-Drive Board control signal.
  5. ASIC Chip > The main processor that generates and outputs the Logic Drive signal and the address data.
  6. DDR memory for MENCON > The memory to save the Address output data to.
  7. SDR memory for Frame Delay > The memory to save FCR-applied data to.
  8. JTAG Port > The port for uCOM communication.
  9. Start Screen Option pin > Select the NTSC / PAL Mode Rolling Option for the initial screen (CN2007)
  10. 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.
  11. Flash Memory > The Flash Memory to save the MICOM data to.
  12. Buffer Connection connector > The connector to output the address data and the control signal to the E-buffer board at the bottom.
  13. 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].
  14. Buffer Connection Connector > The connector to output the address data and the control signal to the F-Buffer Board at the bottom.
  15. 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
Contd: 

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