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7. Adjustments when the B Board Needs to be Replaced
Chapter 7 - Adjustments when the B Board is Replaced
If the B board is replaced, the A/D Converter levels and white balance need to be adjusted or the brightness and
tint range will not be consistent when switching inputs. These settings are made from the service mode for each
input (Tuner, Video and Component) type and the data is saved in a NVM IC on the TV’s B board.
Service Mode Access
1. The TV must be in the Standby Mode as indicated by the front panel light. If this Standby light is OFF, plug
the TV into AC, press the front panel Power button and then shut off the TV from the remote control. The
Standby light should now be lit while the TV is OFF
.
Ref. Figure 7-1.
Standby Mode
Standby/sleep
light must be
red
TV
Figure 7-1
2. Using a Sony remote control aimed at the TV in the standby mode, press: Display, 5, , Power ON
and
MENU,
quickly. If the TV turned ON when 5 was pressed, you did not press the next button fast
enough and will have to try again.
3. The following
new
service Mode menu shown in figure 7-2 will appear above the normal user menu. Use the
remote control joystick to move and change the data as before. Store the new data by pressing Mute, and then
Enter, as before.
A/D Converter Adjustments
White balance and brightness levels for the three types of video inputs are set in the AD Converter area of the
service mode. All three types of video inputs (RGB, YUV and Video) are shown in Figure 7-3 and Table 7-1.
Adjust each one by feeding the corresponding white input to the back of the TV or temporally preset them to
these default values shown. Use the remote control joystick to select and change the data.
Figure 7-2 - Service Mode Display
Service
Menu
Normal
User
Menu
