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crwdns2944351:0crwdnd2944351:0Ubiquiti UniFi AP AC Lite TVS Diode Replacementcrwdnd2944351:0crwdne2944351:0

crwdns2933797:0Yang Zhaocrwdnd2933797:0crwdne2933797:0

crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Yang Zhao

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Ubiquiti UniFi AP AC Lite
Type
replacement
Thing
TVS Diode
Title
Ubiquiti UniFi AP AC Lite TVS Diode Replacement
Introduction
This guide outlines steps needed to repair an Ubiquiti Unifi AP AC Lite (model UAP-AC-LITE) access point which '''does not power on''', and is identified by the PoE injector has having a power fault. (Blinking white on the PoE injector.)
The UAP-AC-LITE contains an over-voltage protection circuit driven by a unidirectional TVS diode. While this diode is not a fuse, it's expected failure mode is to short, and diverts power away from the rest of the board. This short is also detected by the PoE injector, which causes it to not deliver power.
In this guide will show how to:
# Disassemble the UAP-AC-LITE
# Test if the over voltage protection TVS diode has failed
# Remove and replace the broken diode
Time Required Min
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Time Required Max
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Imageid
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Difficulty
Difficult
Conclusion
To reassemble your device, reattach front.
Author
Yang Zhao
Public
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  • Jimmy x1 Standard plastic prying tools may not be sufficient. A Jimmy or comparable is highly recommended. (featured) added.
  • iFixit Opening Tool x1 added.
  • Multimeter x1 Digital multimeter with diode tester is ideal, but any ohmmeter should be sufficient. added.
  • Tweezers x1 Curved tweezers is most ergonomic, but regular tweezers should get the job done. added.
  • Soldering Iron x1 A small enough tip to work with surface mounted component is required. added.

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  • In Progress added.
  • Community-Contributed Guide added.

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