Texas Instruments Extensa 660 Series Maintenance Manual page 80

5-20 Troubleshooting Procedures
3
Check CN4 and CRT
Cable
Yes
Check VGA Clock,
14,318MHz and
32,768KHz
Yes
END
Figure 5-4 CRT Interface Troubleshooting Diagram
System Fails to Boot:
CRT Interface Checks
Check L15, L21, L22,
No L23, L24 (Red, Green,
Blue, Hsync, Vsync)
Check U20 (2093)
Pin 71=33MHz,
No
Pin 93=14,318MHz,
Pin 82=32,768KHz