Samsung PDP4298ED, Service Manual, Page: 58 / 102

Circuit Operation Description
Samsung Electronics 5-39
5-5-3 Troubleshooting
There are several reasons an error can occur on to the logic board. The following flow charts show
solutions to many problems.
5-5-3(A) No Screen Display Output
Check the power inputs.
Check the operational status
of the LED indicators.
Check the detailed waveforms.
(Need to switch to the
internal pattern)
Replace the 256K EEPROM
and check again.
Check the internal patterns.
Check the detailed waveforms.
(Refer to the Inspection
Procedure attached.)
Check the power cable
connections.
Check the fuse.
Check the inductor on the
power terminal.
YES
YES
NO
NO
5-5-3(B) Screen Error
Check the operational status
of the LED indicators.
Replace the 256K EEPROM
and check again.
Check the internal patterns.
Check the detailed waveforms
(Refer to the Inspection
Procedure attached.)
Check the video board.
Check the buffer board.
YES
Screen error of a specific COF block.