DOWNLOAD Panasonic PT-TW343RE Service Manual ↓ Size: 19.44 MB | Pages: 91 in PDF or view online for FREE

Input 100-240V, the 
standby indicator 
is off

Check the main board's 
16V power input

Yes

Yes

Yes

No

No

No

No

Check 3_3V_MCU and 

if ON_MCU (7th pin of 
IC1801) is high level

Power error
Check if the fuse is melt
If there is any component 
damaged on the power board

1.1. 3_3V_MCU is low, check 
IC1007 is working properly 2. If 
the seventh pin of IC1801 is low, 
IC1801 is abnormal.
2.1. Reburn Sub CPU and Flash 
program 
2.2. IC1801 is abnormal

1.1. Check if IC1102/
IC1009 and IC1008 are 
working properly
2.1. Reburn Sub CPU and 
Flash program
2.2. Replace IC1004

1. Check if IRIS is abnormal when the projector is started. 
2. Check if FAN_A, FAN_B and FAN_C are low level when the projector is 
started. If yes, the projector is normal.

1. Check if P3001 is well connected

2. Check LAMP SW (P3002) is well connected
3. IC3100's 8th and 10th pins are high level and 5th pin is low level.

1. Check if TEMP. A (P3006) is well connected
2. Check if IC1002 and IC1003 and their surrounding loops are normal

The projector 
cannot be turned 
on and the orange 
indicator is on. 

The green indicator 
is on when the 
projector is turned 
on and the lamp 
is off. 

The orange 
indicator is flashing 
when the projector 
is turned on. 

Yes

No

Yes

Yes

Follow the procedures below.

Follow the procedures below.

No picture with all input 
sources

Check signal adjustment loop and LCD driving loop;
  Check power supply circuit S16V and peripheral circuit.  
  Check IC1001, IC8001 and peripheral circuit.

No picture with PC2 input 
source only

Check if the HV Sync signal of IC4009's 8th/11th pin is normal; 
   Check if the IC1001's peripheral circuit, R1191/R1194 have H/V 

Sync. 

Check PC/AV source selecting loop and processing loop; 
   Check IC4009 and peripheral circuit.

No picture with all 
computer input sources

Yes

Yes

No

No

No

No

Check AV source selecting loop and decoding loop; 
S-Video source
  Check S-video sign (Y/C).
   Check if IC1001's peripheral capacitor C1803 has signal. 
Compound video source 
  Check the composite video source (video). 
  

Check if IC1001's peripheral capacitor C1805 has signal. 

No picture with video 
input sources

Yes

Check IC1001, IC4009 and peripheral circuit.
  Check if the HV Sync signal of IC4009's 6th/3rd pin is normal; 
   Check if the IC1001's peripheral circuit, R1051/R1193 have H/V 

Sync. 

No picture with PC1 input 
source only

Yes

Check IC1001<Scaler> and peripheral circuit.

 No picture with HDMI 
input sources

Yes

Yes

No

Follow the procedures below.

Check IC5202 and peripheral circuit.
  Check if the power supply of 
L5007and L5008 reaches 5.5V

Yes

Check related circuits of Q50011/Q5010/Q5005/Q5001.

Check the voltage of pin 
4 and pin9 is more than 
3V. 

No

1. Check if the loudspeaker cable is plugged or broken. 
2. Check if the loudspeaker is damaged.

Check pin 43 and 46 of 
IC5007 have audio signal 
output. 

No

Yes

This projector provides the shutdown function to set into the standby mode immediately for product safety when 
the projector has the fan operation error or lamp lightning error.

Not lighting or flashing

Power supply block
Fuse : Rated 6.3A

Blown out of fuse
(with another reason)

–

Thermal switch 
     

 Over 120ºC

Blown out of thermal fuse (with another 
reason) 
Check usage environment

–

Ballast block
Fuse 

Intake duct clogging
Ballast block error

–

ON(G)/STANDBY(R) LED 
blinks in Orange
WARNING LED blinks in 
Red

Lamp cover switch 
     

  Shutdown immediately if switch 

is OFF

Lamp cover is not installed securely

–

Lamp igniting error

Lamp error/burning

–

ON(G)/STANDBY(R) LED 
blinks in Orange
WARNING LED is Off

Intake air temperature sensor

Intake air temperature error 
      Filter clogging 
      High temperature of environment 
      Ventilation holes are blocked

–

Internal temperature sensor A

Internal temperature sensor A error 
      Filter clogging 
      High temperature of environment 
      Ventilation holes are blocked

Internal temperature sensor B

Internal temperature sensor B error 
      Filter clogging 
      High temperature of environment 
      Ventilation holes are blocked

–

ON(G)/STANDBY(R) LED 
lights in Orange
WARNING LED is Off

Each FAN LOCK signal 
     

 No signal

FAN A (F3001/F3002)

Connector disconnection
Fan rotation error

–

Each FAN LOCK signal 
     

 No signal

FAN B (F3003/F3004)

Connector disconnection
Fan rotation error

–

Each FAN LOCK signal 
     

 No signal

FAN C (F3005)

Connector disconnection
Fan rotation error

–

Detects Power error signal "P-FAIL".

Internal power supply line error

–

ON(G)/STANDBY(R) LED 
lights in Orange
WARNING LED lights in 
Red

Iris operation error

Iris unit error
Connector disconnection

–

WARNING LED lights in 
Red

Lamp runtime
     

 Over 6000 hours

Lamp replacement is necessary

Indicate lamp replacing icon

WARNING LED blinks in 
Red

Lamp runtime
     

 Over 6600 hours (It will auto-

matically shutoff in 10 min.)

Lamp runtime is over

Indicate lamp replacing icon