Troubleshooting Chart; Figure 6 Main Board Testpoints (Bottom View); Section 3 - Garmin GPS 155 Repair Manual

2.4

TROUBLESHOOTING CHART

PROBLEM
Unit will not power on
Unit will not power off
Display has horizontal or vertical lines
Display has missing or dark pixels
Figure 6
Main Board Testpoints (Bottom View)
9
RECOMMENDED ACTION
Check External Power Connection
Check External Battery Pack(see Section 3.2 & 4.3.2)
Replace Pwr/Dimmer Switch (see Section 3.2.7)
Replace Main Board (see Section 3.2.4)
Replace Main Board (see Section 3.2.4)
Replace Control/Display Unit(see Section 3.2.1)
Replace Pwr/Dimmer Switch (see Section 3.2.7)
Replace Display Board (see Section 3.2.9)
Replace Main Board (see Section 3.2.4)
Replace Control/Display Unit(see Section 3.2.1)
Replace Display Board (see Section 3.2.9)
Replace Control/Display Unit(see Section 3.2.1)