33
3.3V
0V
TROUBLE SHOOTING
1. POWER
1.1. The unit does not power on
YES YES
YES
NO
NO
YES
NO
NO
Does the power indicator
on the front panel ash in
green when the power is
turned on?
Has a fuse broken?
Does the power display on
the front panel change to
lighting in green after ap-
proximately 10 seconds?
Check the voltage of pins 6
- 9 of CN712 on the DIGITAL
PCB while the power display
is ashing in green.
Disconnect the MAIN PCB connector (BN502).
Check the
"
Protection History Display mode
"
(See 24 page)
The unit does not power on
Has a fuse broken?
Does the power indicator on
the front panel ash in red
when the power is turned on?
Is DC5V being supplied
from the SMPS PCB (BN601)
to the DIGITAL PCB?
See "1.2.Fuse is blown."
See "1.2.Fuse is blown."
Check the microprocessor ## circuit from
CN751 in the DIGITAL PCB, and replace
any faulty items.
To "
Protection
History Display
mode
"
(See 24 page)
Are any parts not fully con-
nected in the connectors that
connect the PCBs?
Is DC5V output even when
the connector (CN751)
supplying power from the
SMPS PCB to the HDMI PCB
is removed?
Check the circuits around
the Microprocessor on the
DIGITAL PCB and replace
any faulty parts.
Check for breakages and short circuits
in the circuits and parts between
CN751 on the DIGITAL PCB and the
microprocessor power supply and
replace any faulty parts.
Connect the connectors cor-
rectly.
TO "6. SMPS"
(See 42 page)
NO
YES
YES
YES
NO
NO NO
YES
Check for leaks and short
circuits in the parts on the
primary side. Replace any
faulty parts.
Broken fuse
Check the rectier diode in
the rectier circuit on the
secondary side, and check
the circuit for short circuits.
Replace any faulty parts.
Replace the fuse after repair.
Check for short circuits between
the regulator output terminal and
GND in the power supply stabili-
zation circuit. Replace faulty parts
if there is a short circuit.
1.2. Fuse is blown
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