LED Cinema Display (27-inch) Troubleshooting — General Troubleshooting 16
2010-11-18
Test Points Diagram
Test Points for DC Power Presence
Following are test points you can
use to verify proper power flow in
the LED Cinema Display. All voltages
assume that the display is only
plugged into a power outlet, and
NOT into the host computer.
How to proceed:
•
Turn the dial of your voltmeter/
multimeter to measure DC (direct
current). If your voltmeter requires
that you set a voltage range,
choose a DC range that includes
the voltage that you are measuring.
•
Connect the black probe to ground
by gently inserting into any of the
logic board corner screws posts.
•
Touch the red probe to the
appropriate test point.
•
Verify voltage on multimeter.
•
For the USB power presence, plug a
known-good iPod, iPad or iPhone
device and check for a spark icon
visible on the device LCD display.
DC In
24.5 V DC
12.0 V DC
*5.1 V DC
*even if USB is
not plugged into
host computer
3.3 V DC
USB power and
charge f iPod,
iPad and iPhone
Warning ! HIGH VOLTAGE :
Use extreme caution when working
around the power supply.
• Never touch the leads on bottom and left
side of the power supply around the
warning sign.
• Do NOT lean over or accidentally touch
power supply area during living testing.
• Keep your fingers behind the finger
guards of the test probes when making
measurements !
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