Wednesday, August 29, 2012

TOSHIBA 28MW7DB 28MW7DG ELECTRICAL ADJUSTMENTS [2 of 2]



[2 of 2]


ELECTRICAL ADJUSTMENTS.



ITEM
ADJUSTMENT PROCEDURE


Focus adjustment
# Enter the Service Mode and select any register item.  # Press TV/Video button  on the remote control until the balck corss bar pattern appears on the screen.  # Asjust Focus control  in the line output transformer (Top One) for well defined scanning lines on the picture screen.

Sub-Brightness [BRTC] [Note:  Constrict picture height until the vertical retrace line appears adjusting the item HIT (Height)]
# Set contrast to minimum and brightness to center by adjusting user controls. # Set the TV in service mode to get white cross bar of inside pattern.  # Select BRTC , and adjust the Volume Up/Dn to reduce the value, so that white portion of inside pattern slightly light.  # Adjust Vol Up/Dn to increase the data value of BRTC, and set it just before the difference between the belt of the vertical retrace, and the border of black portion of inside pattern is visible.  After that, return vertical height  and contrast.

Horizontal position adjustment [HPOS]
# Set the TV in service mode and get black or white cross-bar signal with video button on the remote control.  # Select either HPOS (Horizontal Phase) or VPOS (Vertical Phase) with Channel Up/Dn buttons, and adjust the horizontal or vertical picture position  to the center of the screen with Volume Up/Dn buttons.

Vertical amplitude adjustment.  [HIT]
# Set the TV in service mode, and get black or white cross-hatch signal with video button on the remote control.  # Select HIT with Channel Up/Dn buttons and adjust the vertical amplitude by using Vol Up/Dn buttons, so that the first bar on cross hatch signal touches the edge of the screen.

White balance adjustment.
  • Cut-Off adjustments
  • Drive adjustments
# Set contrast to ‘40’ and brightness to ‘+20’ by picture control.  # Set TV in Service Mode and get the inside W/B adjusting signal with video button.  # Select R-Cut, G-Cut and B-cut with Channel Up/Dn buttons to set individual values to initial reference data with Volume Up/Dn buttons on the remote control.  # Press [-/---] button on the remote control and rotate screen VR to get a slight horizontal line on the screen.  For every pressing of [-/---] button provides Horizontal line picture and normal picture alternately.  # Press [-/----] button to release horizontal line picture, and select the tow other colors which did not light in the above step with Channel Up/Dn buttons.  Then tap Volume Up/Dn buttons so that three colors slightly light in the same level.  *To correct white balance in light area, select GDRV with Channel Up/Dn buttons to adjust.  ** To correct white balance in dark area, perform fine adjustment of R-Cut, G-Cut and B-Cut.