Samsung HL67A750A1FXZA Service Manual page 37

1. Noise:
Internal noise may be caused by a foreign substance on the fan or driving device.
For a DLP TV, the LED fans and DMD board fan are vulnerable to noise. Sometimes the connector wire around the
lamp or DMD fan makes contact with the fan.
When irregular noise occurs for no particular reason, check the inside of the TV for any foreign substances.
The DLP projection TV may cause noise because the physical space is empty inside, causing a resonance at a particular
frequency. Thus a low vibration is not a malfunction.
Any 'creaking' noise is mostly from the structure of the device itself. A short, harsh noise may occur from a distortion or
malformation due to thermal expansion between the metal joints, screws and loaded parts, respectively. Any intermittent
'creaking' noise can be removed by loosening the screws.
2. Black Screen (Voice Output):Replace the DMD board
3. A black screen with the LED on : Replace the DMD Board.
4. Line Pattern: Regular line patterns occur vertically or horizontally: Replace the DMD board.
5. Voice Distortion: Replace the main board.
6. Outside Light: This is not a product malfunction, but a possible installation or human error. This occurs when the projected light
from the surrounding illumination reflects onto the screen. This disappears as the TV starts operating and the TV lamp gets
brighter. However, you can avoid outside light by changing the position of the TV or the installation angle.
Decreasing the illumination or changing the indoor lighting may work.
7. Screen Flip-over:
Enter Factory mode in DDP3021 and perform H-Flip (flip horizontally) and V-Flip (flip vertically).
The screen will flip over horizontally or vertically.
Samsung Electronics
Troubleshooting
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