Garmin 155 GPS Receiver User Manual


 
Figure 6
Main Board Testpoints (Bottom View)
2.4 TROUBLESHOOTING CHART
PROBLEM RECOMMENDED ACTION
Unit will not power on
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)
Unit will not power off
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)
Display has horizontal or vertical lines
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)
Display has missing or dark pixels
Replace Display Board (see Section 3.2.9)
Replace Control/Display Unit(see Section 3.2.1)
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