Samsung SP42L6HN Service Manual page 48

Troubleshooting
Bad image - 16 pixel
wide vertical lines
Bad image -
Horizontal bands or lines
Bad image -
Bad Color lamp test image
Bad image -
Vertical white lines
Bad image -
All or almost all images are bad
6-12
1. Check if DMD is properly connected
2. Check the DMD data output from DDP1011 ASIC to the DMD pad
1. Check if DMD is properly connected
2. Check the output of DDP1011
3. Check the supplied voltage to DDP1011
4. Replace DMD or DDP1011 if necessary
5. Check the VCC2 voltage
1. Check if Data input GY(7:0), RV(7:0), BU(7:0) is properly connected
2. Check the color wheel for the placement
3. Check CWINDEX if it makes only one wave change per color wheel rotation
4. Check if the color wheel rotates in the right direction
5. Check if the color wheel has the right sequence version
6. Check the flash for the checksum
7. Check if the color wheel rotates at the right rate
1. Check the data connection between RDRAM and DDP1011 ASIC
2. Replace RDRAM or DAD1011 if necessary
1. Check if the address and control signal between DDP1011 and RDRAM
are properly transferred
2. Replace RDRAM DDP1011 if necessary
3. Check DMD VCC and VCC2
4. Check if DMD is properly connected
5. Establish the DMD clock rate that matches the sequence rate
The image leans to the left
Unclear or reverse image
Contact a DLP™ service person.
1) OLCAT is flexible or always close to High
1) Check if DMD is properly connected
2) Check DMD
3) Check DDP1011
4) Check the DMD drive voltage (VBIAS, VCC2, VRESET)
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