PRO-730HDI
116
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8. GENERAL INFORMATION
8.1 DIAGNOSIS
8.1.1 DIAGNOSIS METHOD
P.D.
Yes
DEFLECTION SERVICE
Assy
No
Is D111 lit ?
to P.D. (2)
Is D107 lit ?
No
Yes
POWER SUPPLY
Assy
to P.D. (1)
Confirm it
whether it is P.D..
D107
D111
SIDE A
LED points
Front
Various protection circuits are provided for this unit. When these
protection circuits are activated, the power of the unit is shut
down (P.D.: Power Down).
The defective parts can be easily diagnosed by observing the
LEDs inside the POWER SUPPLY Assy.
1. D107 in the AWV2057 (For POWER SUPPLY Assy)
2. D111 in the AWV2057 (For DEFLECTION SERVICE Assy)
How to Diagnose a Failure
POWER SUPPLY ASSY
P
Note: There is a case that DEFLECTION SERVICE Assy P.D.
works when there is a damage with the POWER SUPPLY
Assy.
Example)
If there is not 6V, V DRV+, V DRV- does not come out. And P.D.
hangs with the DEFLECTION SERVICE Assy more first than the
POWER SUPPLY Assy.
1. P.D. (1)
Failure in the POWER SUPPLY Assy.
There are two main possibilities:
1. Blown fuse(s) in secondary
2. Abnormality in AUDIO OUTPUT
Status
Causes
Check Items
Probable Defective Parts
D320 ANODE
Hi
Blown fuse (s)
The voltage (approx. 14V) at D307 is not supplied.
VIDEO UCOM SERVICE Assy,
DVI SERVICE Assy
The voltage (29 to 38V) at R306 is not supplied.
IC1101 (POWER SUPPLY Assy)
The voltage (approx. 6.5V) at "6V" JP is not supplied.
VIDEO UCOM SERVICE Assy,
SIGNAL Assy, DVI SERVICE Assy
The voltage (approx. 4.8V) at "4V" JP is not supplied.
D1106 ANODE
Hi
Abnormality in
AUDIO OUTPUT
The SP line (CN1101) is disconnected.
Connect the SP line.
The voltage at the negative electrode of the C1114 and C1117 is
5.5V or more.
C1114, C1117
(POWER SUPPLY Assy)
Note: The anode of the diode is high only for a short time after the power is turned on until the protection circuits are activated (P.D.)
The LEDs are lit by the HOLD circuit.
In a case when the power cannot be on with no LED lit, check the following:
1. Check if the FU201 fuse in the POWER SUPPLY Assy is blown.
2. Disconnect and check connector P1 (CN407) to see whether STB 5 V is supplied.
If STB 5 V is supplied, replace the VIDEO UCOM SERVICE Assy. If STB 5 V is NOT supplied, replace the POWER SUPPLY Assy.
3. Disconnect and check connector P2 (CN404) to see whether AC CLK is supplied.
If AC CLK is supplied, replace the VIDEO UCOM SERVICE Assy. If AC CLK is NOT supplied, replace the POWER SUPPLY Assy.
When overload detection mechanism is activated, the 10V line is short-circuited. If the power switch is set to ON again in this condition,
there may be a case where the power cannot be turned on, with just a whining sound, and where only the D107 LED in the POWER
SUPPLY Assy is lit. If this happens, first replace only the VIDEO UCOM SERVICE Assy, disconnect the AC cord from the AC outlet or
turn the main power switch OFF, and wait for five minutes. Then, turn on the power again. If the condition is ameliorated, only the
VIDEO UCOM SERVICE Assy is defective. If the same symptom occurs, replace the POWER SUPPLY Assy. In the latter case, the
VIDEO UCOM SERVICE Assy may not be defective.
SIGNAL and TUNER Assemblies also perform the same thing as VIDEO UCOM SERVICE Assy, and exchange the unit that verified the
unit and has broken.
F
