Troubleshooting
Samsung Electronics
4-1
4. Troubleshooting
4-1 Troubleshooting
4-1-1 First Checklist for Troubleshooting
■
Basics:
- The DDP3021 on the DMD board has a feature to display internal test patterns.
- The is the output of the Main. DMD is the final one.
■ Diagnosis By Module
1. Access Service Mode
(In Standby mode, press MUTE, 1, 8, 2 and POWER to turn the screen on and enter service mode)
2. Check if there is an error in the DMD board
DDP3021 → TEST PATTERN → Press the right arrow key:
Options of FULL WHITE, BLACK, RED, GREEN and BLUE PATTERN and so on are displayed on the screen.
If “Pattern” does not appear or same symptom is appeared on DDP3021 pattern, this is a DMD board error.
3. Check if there is an error in the main board.
Check for a power signal from SMPS to other board see the schematic diagram. (7-3) And check for indicated power signal.
MST336
CCLK
I
N
P
U
T
PC
Component
HDMI
ATV, DTV, AV
DDP3021
DMD
Panel
MAIN
DMD
SCREEN
OSD OK?
Main BOARD ERROR
DDP 3021 Pattern
CHECK THE SCREEN
CHECK THE SOURCE
NG
OK
DMD BOARD ERROR
NG
OK
Summary of Contents for HL67A750A1FXZA
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