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Original question:
The issue of the last post is still not fixed.
Customer used pure R, G, and B colors to check and found there is error display for some pixels.
Linux desktop wallpaper and color also have errors.
Customer use SN75LVDS82 MSB 6bits and skip LSB 2bits to connect with their RGB666 TFT panel.
Please refer to attached datasheet and help to review the schematics to check if there is anything wrong with it.
Thanks.
Hi Peter,
It looks like when the system transitioned from 24bit RGB to 18bit RGB, the data format on the SN75LVDS82's output was not appropriately adjusted to account for this change. More specifically, a certain bit-mapping is required on the SN75LVDS82 depending on how many bits are being used. Looking at the schematic, it seems as if the LVDS output of the SN75LVDS82 is still partially mapped for 24bit RGB instead of 18bit RGB, with mis-mapped pins highlighted in yellow. Please follow the datasheet's Typical Applications Diagram for 18bit RGB and adjust the schematic accordingly.
In addition, is there a specific reason why there are 0 Ohm resistors on some of the output pins and not all?
Best,
Nikolas
