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Chapter 4 - Appendix
CTV-68 30
Figure 4-3 illustrates 2 examples of a loss of control data to the drive
IC’s. In the first example, an entire group of column drivers has lost the
data stream for red. The second example involves the complete loss of
drive data for all RGB information to the right side of the screen. This is
sometimes caused by the flat cable connecting the TCON to the LCD
panel coming loose. The area of missing video can be dark or completely
white depending on the panel design.
Service Tip: Select an inactive input (or one that is known to be a 4:3 SD
source) and toggle between the “normal” and “zoom” modes. If the lines
follow the zoom changes, the problem is located on the video process
board. If they stay in the same place, they are originating in the TCON or
LCD panel.
DEFECTIVE
TCON DATA
OUTPUT
DEFECTIVE
TCON OR LOOSE
TCON TO PANEL
CONNECTING
CABLE
FIGURE 4-3
LCD TIMING CONTROL FAILURES