Samsung D61B Training Manual page 75

Troubleshooting
7-2-2 The Logic Board
The Logic Board consists of the Logic Main Board and the Buffer Board. The Logic Main Board processes
video signals to produce the Address Driver Output Signal and the Buffer Board delivers the Address
Driver Output Signal to the Address Driver IC (TCP Module).
Logic Board
Logic Board
(Main)
E-Buffer Board - left side
Buffer Board
(Buffer Board,
F-Buffer Board - center
on the back side)
G-Buffer Board - right side
7-2-3 Waveform in a Normal State
When the PDP set is working properly and the Logic Board is normal, the Activity Indicator LED (as shown
in Fig. 1) blinks once per second.
Check the LED when the PDP has an error, and replace the Board if the LED status is abnormal.
If inspection of the board is required to clear a PDP unit error, refer to the Logic Board Inspection Guide for
the procedure (provided separately).
7-2-4 Diagnosis and Troubleshooting
A fault in the Logic Board can be caused by various reasons; follow the flow chart for troubleshooting.
No Screen Image
Check the Activity Indicator LED
NO
Check the Detailed Waveforms
(Switch to the Internal Pattern.)
7-12
Processes Video Signals (W/L, Error Diffusion, APC)
Outputs the Address Driver Control Signal and the
Data Signal to the Buffer Board
Outputs the XY Driving Board Control Signal
Delivers the Data and Control Signal to the left TCP
Delivers the Data and Control Signal to the center TCP
Delivers the Data and Control Signal to the right TCP
Check the Input Power
YES
YES
Replace the 256K and
examine the PDP unit
Check the Internal Pattern
Check the Detailed Waveforms
(Refer to the Inspection Guide)
Function
NO
Check the Power Cable
Check the Fuse
Check the Power Unit Inductor
Remakr
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