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Circuit Operation Description
5-3-1(C) WAVEFORMS IN NORMAL OPERATION
If the PDP unit and the logic board are operating properly, the operation LED in the figure will blink at
about 1 second interval.
If the set doesn't operate normally, first check the status of the operation LED through eye-inspection, and
then replace the board. To check and troubleshoot, follow the logic board test procedures attached in
appendix.
4
Troubleshooting for 42" SD s1.0 logic main board
Required test equipment :
Other equipment :
! First, perform eye-inspection and short circuit inspection on the power stage of the logic board to exam-
ine. If no problem is found, perform the following examinations on the board in order.
@ Replace IC2017(256K EEPROM) of the logic board with Test EERPOM. Change the clock setting of the
logic board to internal. (Refer to the setting procedures described on the next page.)
fl If there is no available Test EEPROM, you can use PG 00 for Windows NT systems, or PG 40 for
NT/PAL compatible systems by setting address 20 to 81, 22 to 00, 23 to 00,and 70 to 01.
# Connect power(5V) to LD1, and check that LED(LD2000) on the left top of the board blinks at about 1
second interval.
$ If the logic board doesn't operate normally, the LED will blink too fast or not be lighted on.
% If no problem is found in the above examination, connect sub-PCB for logic output check, measure out-
put waveform, and then compare the waveform with the appended waveform in normal operation.
Record either OK or NG after examination.
^ Check the drive Y s/w, the drive X s/w, and the address signal in order.
& Set probe 1 of oscilloscope to trigger signal and connect it to the TP31 of the logic board.
* Set the oscilloscope to 2ms/div. After adjusting probe 2 to 5V/div, check the output signal.
( After troubleshooting is complete, turn off the power supply and disconnect connector.
5-34
- Oscilloscope (digital 400 MHz 3 channel or more)
- Multi meter
- DC power supply (5V: 1EA )
- Sub-PCB ASS'Y for JIG: 1 EA
Samsung Electronics
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