Sony KDL22EX308, KDL32EX308 manual Lcd Timing Control Failures, Appendix, CTV-68

Chapter 4 - Appendix

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

CTV-68 30