Samsung PS42S5HX/XEH - Logic Board Troubleshooting Flowchart

Circuit Description
Samsung Electronics 13-11
■ Troubleshooting
There are various problems caused by the Logic Board and these have been classified by the Flow Chart.
- No picture on the screen
Check the Operating Status LED
Check Power Input
Check that the internal
default is black.
(Using key scan. Address: 0080
0000: Black
0001: Full White)
Check to see if the ADDRESS
DATA output is normal.
Check to see if MICOM
is operating properly.
Check the ASIC
control signal output
MICOM
Downloading
Check that the data and
control signals between
DDR and ASIC are normal.
Check the power cord
connectivity.
Check the fuse
Check the Input Voltage Level
Yes
Yes
Yes
Yes
Yes
No
No
No
- Screen Error
Check the
Operating Status LED
MICOM Downloading
Check the Internal Waveform Pattern
Check the Video Board
Discharge Trouble
Check the Detailed Waveform
Screen Trouble with
Missing Vertical Lines
Screen Trouble with
Missing Horizontal Lines
The Buffer Board and the Logic
Main Address Data Output
Check the Short/Open Defect
of the TCP Part.
Check the Drive Y-Buffer Output
Yes