Panasonic PT-VX505NU / PT-VX505NE / PT-VX505NEA / PT-VW435NU / PT-VW435NE / PT-VW435NEA (serv.man2) Service Manual ▷ View online
-73-
Troubleshooting
No power
-
When all of LED indicators are not lighting, the symptom indicates that the primary power supply circuit does
not operate properly. Check the power primary circuit and parts as follow;
AC cord, F601 (Fuse), Power board, SW902 (Thermal fuse)
SW902 opens when the surrounding temperature of the switch exceeds 113°C.
This projector provides a function which can be specified a defective area simply by indicating the LEDs. Connect the
AC cord and press the
button once and then check the LED indication.
-
When the WARNING (red) and ON(G)/STANDBY(R) (orange) indicators are flashing, the symptom indicates
that the projector detected an abnormal temperature risen inside the projector. Check the air filters and remove
the object near the intake and exhaust fan openings, and wait until the ON(G)/STANDBY(R) indicator stops flash-
ing, and then try to turn on the projector.
The internal temperature is monitored by sensor ICs, IC8831, IC8821 on the MAIN board and IC8811 on the R/C
board.
-
When the WARNING indicator lights red, the symptom indicates that the projector detected an abnormality in
the cooling fan operation or in the power supply secondary circuits. Check fan operation and power supply lines,
and the driving signal status.
The P_FAIL signal (Error: L), FAN_ERR_B signal (Error: L) and FAN_FAIL1 signal (Error:L) are sent to pins, 215
and 29 of IC301 <SYSTEM CONTROL> respectively when the abnormality occurred inside the projector, and
then the IC301 sends the shutdown signal, LAMP_DC_ON, to the power supply circuit to stop its operation, and
signal LAMP_SCI to the lamp ballast board via IC9885 and SW901<lamp cover switch> to stop operation of the
lamp circuit.
An abnormality occurs on the secondary power supply;
Check power supplies S16.5V, S6V, S-7V.5VSTB, P_FAIL signal becomes Low when the abnormality oc-
curs on any of the power supply lines.
An abnormality occurs on the fan control circuit;
If fans FN901, FN902, FN903, FN904, FN905,FN909 has an error, the FAN_ERR and P_FAIL signals
become "L". If fans FN909, FN910 has an error, the FAN_ERR_B signal become "L".
If fans FN906,FN907,FN908,FN910 has an error, the FAN_FAIL1 signals become "L".
The FAN_ERR signal cuts off the LAMP_SCI signal which is supplied to the lamp ballast board if the
FAN_ERR signal is "L".
An abnormality occurs on the drive signals;
The driving signals for the each power supply are shown in the table below.
Drive signal
Output IC
Pin
I/O
Level
Switch/IC
Power/Circuit
15.25P_SW
IC501
212
O
H
IC582
15.25V
12.25A_SW
154
O
H
IC592
15.25V_A
POW_GAM_3.3V
IC301
275
O
H
IC411
3.3V
POW_GAM_2.5V
353
O
H
IC431
2.5V
POW_GAM_1.8V
271
O
H
IC441
1.8V
POW_GAM_1.0V
276
O
H
IC421
1.0V
POWER_SW1
IC9885
17
O
H
IC5821
IC5861
IC5861
S3.3V
S1.8V
S1.8V
POWER_SW
5
O
H
RL601
Standby circuit
Lamp cover switch
Make sure that the lamp cover is mounted correctly. If not or the
lamp cover removed, the lamp does not light on for the safety.
Check the lamp cover and lamp cover switch (SW901).
SW901
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Troubleshooting
No picture
Check following steps.
No picture with all of
input sources
Check signal processing stage and LCD driving stage;
Check RGB S&H signals at test points VSIG_G1, VSIG_R1,
VSIG_B1.
Check power supply circuit S16.5V and peripheral circuit.
Check IC IC501, IC561,IC301 and peripheral circuits.
No picture with PC2
input source only
Check IC301<Scaler>, IC5301<HV Sync SW> and peripheral circuit.
R2, G2, B2 signals are applied at pins 172, 78, 256 and HS2, VS2
signals are applied at pins 253, 66 of IC301.
Check PC/AV source selecting stage and processing stage;
Check IC301<Scaler> and peripheral circuit.
No picture with all of
computer input sources
Yes
Yes
No
No
No
No
Check AV source selecting and decoding stage;
S-Video source
Check S-video signal (Y/C).
S_CHROMA signal is applied to pin 265 of IC301<Scaler>, and S-Y
signal is applied on pin 262 of IC301.
Composite video source
Check composite video signal (Video).
The composite video signal is applied to pins 109 of IC301 <Scaler>.
No picture with video
input sources
Yes
Check IC301<Scaler>, IC5301<HV Sync SW> and peripheral circuit.
R1, G1, B1 signals are applied at pins 82, 260, 258 and HS1, VS1
signals are applied at pins 331, 161 of IC301.
No picture with PC1
input source only
Yes
Check IC8001 <HDMI driver> , IC301<Scaler> and the peripheral cir-
cuits.
No picture with HDMI
input sources
Yes
No
-75-
Troubleshooting
No sound
Check IC5003 and peripheral circuit.
Check S-7V at pin 4 of IC5003 and S5V at pin 8 of IC5003 power sup-
ply.
Check if the audio sig-
nal is observed at pins 1
and 7 of IC5003.
Check audio output circuit.
Check speaker, connection of the terminal “K8F”.
Yes
No
Check IC001 and peripheral circuit.
Check the mute signal at pin 1 of IC001. The mute signal is output
from pin 344 of IC 301<Scaler>. The OUT_DET signal is sent from
Audio Out terminal.
Mute-On: H at pin 344 of IC301, L at pin 1 of IC001.
Check if the audio sig-
nal is observed at pins
20 and 23 of IC001.
Yes
No
Check IC5001 and peripheral circuit.
Check the Pins 7 and 32 of IC5001, the voltage is respectively S3.3V
and S1.8V.
Check IC5002<Audio SW> and peripheral circuit.
Video: Pin 9: L, Pin 10: H
PC1: Pin 9: L, Pin 10: L
LAN/HDMI: Pin 9: H, Pin 10: L
Check IC5005<Audio SW> and peripheral circuit.
LAN: Pin10:H
HDMI:Pin10:H
Check if the audio sig-
nal is observed at pins
19 and 23 of IC5001.
Yes
No
Check following steps.
-76-
Serial Control
The serial connector which is on the connector panel of the projector conforms to the RS-232C interface
specification, so that the projector can be controlled by a personal computer which is connected to this connector.
Connection
J
Pin assignments and signal names
J
D-Sub 9-pin (female)
Outside view
Pin No.
Signal name
Contents
—
NC
TXD
Transmitted data
RXD
Received data
—
NC
GND
Earth
—
NC
CTS
Connected internally
RTS
—
NC
Communication conditions
J
Signal level
RS-232C-compliant
Character length
8 bits
Sync. method
Asynchronous
Stop bit
1 bit
Baud rate
19 200 bps
X parameter
None
Parity
None
S parameter
None
Note
When [AMX D. D.] function is set to [On] under the [Network] menu, the Baud rate will change to 9 600 bps
z
automatically.
D-Sub 9-pin (male)
D-Sub 9-pin (female)
Connecting terminals
on projector
Communication cable
Computer
Serial terminal
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