Samsung PDP4298EDX/SMS, Service Manual

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5-5-1 (D) description of Logic Board
The Logic Board consists of the logic main board, which processes video signals and generates and outputs
the address driver output signals and the XY drive signals, and the buffer board, which buffers the address
driver output signals and transmit them to the address driver IC (COF Module).
Circuit Operation Description
5-38 Samsung Electronics
Logic Board
Logic Main
Buffer Board
E Buffer board
F Buffer board
G Buffer board
Function
- Processes video signals (WL, error diffusion, APC).
- Outputs address driver control signals and data signals to
the buffer board.
- Outputs XY drive board control signals.
Transmits data and control signals to the bottom left COF.
Transmits data and control signals to the bottom center COF.
Transmits data and control signals to the bottom right COF.
Remarks
5-5-2 Waveform in Normal Operation
When the PDP set and the logic board operate normally, the operation status LED indicator shown in
Figure 1 blinks once per second.
If the set has a problem, visually check the LED status and replace the board if any error is found. If you
need to detect and check errors, follow the directions given in the Attachment: “Logic Board Inspection
Procedure”.