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Boundless Virgin WebPlayer 200MHZ Internet Appliance
External Display

Click to enlarge

Click to enlarge

Original Picture @ http://k-ray.netbox.be

As you can see in the pictures it is possible to connect an external display to the webplayer. The companion chip U28 feeds all the necessary signals to connect a VGA display. The internal DSTN screen gets its data from U10, a Cyrix CX9210, which gets the pixel info from U28. There a place for a VGA connector but as you can see it is not populated as are the necessary filter and buffer components. However with tracking down the wires on the mainboard and with the pin-out info from the datasheets I found out that the mysterious CN20 is feeding the display signals directly. Looking from the back of the mainboard (so USB on the left and the supply connector on the right) and counting from left to right:

 CN20  CN19  VGA  signal
   1     -    -  VCC +5V
*  2    13    1  RED
*  3    10    2  GREEN
*  4     7    3  BLUE
   -     4    4  n/c (ID2)
*  5     1    5  GROUND
*  5    15    6  GROUND (R return)
*  5    12    7  GROUND (B return)
*  5     9    8  GROUND (G return)
   -     6    9  +5V ?
   -    14   11  n/c (ID0)
*  6     8   13  H-sync
*  7     5   14  V-sync
   8     3   10  GROUND (sync return)
   9    11   12  DDC data (SDA) (ID1)
  10     2   15  DDC clock (SCL)

 

The signals absolutely needed for a display are R/G/B, H/V-sync and ground. The other signals are only to identify the display (eg. plug monitor) and there are different types of identifying a monitor and so it depends from both display and vga adapter which signals are used. You don't need them to display an image and so only take the * signals. 
Connect the color signals through 6.8 ohms resistors, the sync signals through 33ohms resistors and the grounds directly. You can see in the pictures how it is set up.
Solder 3 smt-resistors of 75 ohms from the color signals to ground. This brings the output voltage to a standard level and solves the bright image. Place the resistors at the places with code C46, C51 & C53.

The result is very good.

 

Original posted on http://k-ray.netbox.be

 

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