LED Cinema Display (27-inch) Symptom Charts — Startup and Power Issues 19
2010-11-18
8. Disconnect all connectors from
the logic board EXCEPT the
DC power cable. Set digital
multimeter to DC and correct
range, and verify that a 3.1-3.5 V
DC voltage is present between
logic board test point (3.3 V
DC) and chassis ground (GND),
then verify that a 4.8-5.5 V DC
voltage is present between
logic board test point (5 V DC)
and chassis ground (GND).
Yes Power sources appear
OK when all devices
disconnected. Suspect
possible damaged connector,
short, faulty internal USB,
audio or fan control device.
Reconnect connectors one
at a time and retest for 3.3 V
DC and 5 V DC presence each
time. When any of the 3.3 V
DC or 5 V DC voltages cannot
be read anymore, replace
part that causes their power
failure. Go to step 10.
X03
No The master 12 V DC power
presence needs to be
checked. Go to step 9.
9. Disconnect all connectors from
the logic board EXCEPT the
power supply to logic board
cable. Set digital multimeter
to DC and correct range, and
verify that an 11.4-12.6 V DC
voltage is present between
logic board test point (12 V DC)
and chassis ground (GND).
Yes 12 V DC master power
present, but 5 V DC and 3.3 V
DC are missing: replace logic
board and retest the 12V DC
presence. Go to step 10.
M01
No Faulty 12 V DC source or logic
board shorting it: replace
logic board and retest 12V DC
presence. If issue persists after
logic board replaced, replace
power supply and retest.
Go to step 10.
M01
P01
10. Before reinstalling LCD panel
into rear housing,verify that
LED backlight driver cable on
LCD panel is not damaged
(wires not pinched nor
shorted).
Yes Test reassembled display to
make sure it is fully functional.
No LED backlight driver cable
with pinched or shorted wires
is likely the cause of board
damage. Replace LCD Panel
and take care not to pinch
any cable during reassembly.
Test reassembled display to
make sure it is fully functional.
L01
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