Sony FWD-32LX1R Mounting Bracket, Service Manual

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4-1
FWD-32LX1R
Section 4
Troubleshooting
4-1. Judgment When No Image is
Displayed
The status in the case where “No image is displayed” is
displayed according to the number of times when the
POWER/STANDBY indicator in the lower-right position
of this unit
’
s front panel blinks in red. Two times to six
blinks repeat after several seconds.
Number of blinking times Status
Two times An error code is detected from
the panel.
Three times When the sensor temperature
exceeds the allowable value
Four times An error code is detected from
the fan.
Five times The voltage abnormality of digital
3.3 V and 5 V, analog 5 V and 9 V,
and main power supply is detected.
Six times Error occurs in the communication
with a scaler (IC2300).
4-2. Self-Diagnosis Function
The self-diagnosis function installed in this unit forcibly
shuts down this unit when the items below are detected
(abnormality is generated) or when the allowable value are
exceeded. The detected items and the allowable values are
as described below.
1. Panel error
This monitors the operation abnormality of a panel
inverter. This unit shuts down when the BL_VREF signal
input from CN2202 on the D3 board remains low for two
seconds or more after the power is turned on.
POWER/STANDBY
indicator
Front side
2. Increase in sensor temperature
This detects the temperature of the S board and power
supply boards (G4 and GD boards). This unit shuts down
when the state in which the temperatures below were
exceeded is detected for two seconds or more.
Installed Power Installed Power
horizontally supply vertically supply
S board board S board board
55 d C 82 d C 69 d C 75 d C
3. Fan error
This monitors the operation of a fan. This unit shuts down
when the FAN_DET signal input to CN1008 on the D3
board remains high for one second or more after the power
is turned on.
4. Abnormality of supply voltage
This detects the DC voltage on the D3 board and the error
of the power supply boards (GD board). This unit shuts
down when the DC voltage is put into the state below after
the power is turned on and when the error detection signal
(PS_ERROR) from the power supply boards is set low.
D3.3 V D5 V A5 V PS_ERROR
Allowable 2.6 V or less 3.3 V or less 3.3 V or less (Low)
value
(State)
Time 2 seconds 15 seconds 2 seconds 15 seconds
or more or more or more or more
5. Time-out of scaler communication
This unit shuts down when the symptom below occurs for
more than a fixed time during communication with a scaler
(IC2300).
.
No termination response is returned to a command or the
BUSY state is continued.
. A command is not correctly recognized and NACK is
returned continuously.