DOWNLOAD Panasonic PT-VW355N / PT-VW355ND / T-VW355NT / PT-VX425N / PT-VX425ND / PT-VX425NT (serv.man2) Service Manual ↓ Size: 23.75 MB | Pages: 110 in PDF or view online for FREE

INF-13

1.  The display unit of this projector comprises three LCD panels. Although an LCD panel is a product of high-precision tech-

nology, some of the pixels on the image may be missing or constantly lit. Please note that this is not a failure.

2.  Displaying a still image for a longer time may result in an after-image on the LCD panels. If this happens, display the all 

white screen in the test pattern for an hour or more.

1. The light source of the projector is a high-pressure mercury lamp.
2. A high-pressure mercury lamp has the following characteristics.
  • The luminance of the lamp will decrease by duration of usage.
  •  The lamp may burst with a loud sound or have its service life shortened because of shock, chipping, or degradation due to 

cumulative runtime.

  •  The lamp life varies greatly depending on individual differences and usage conditions. In particular, continuous use for 12 

hours or more and frequent off/on switching of the power greatly deteriorate the lamp and affects the lamp life.

  • In rare cases, the lamps burst shortly after projection starts.
  •  The risk of bursting increases when the lamp is used beyond its replacement cycle. Make sure to replace the lamp unit 

regularly.

   

(Refer to items “When to replace the lamp unit”, “How to replace the lamp unit”)

  • If the lamp bursts, gas contained inside of the lamp is released in the form of smoke.
  • It is recommended that you store the Replacement Lamp Unit as a contingency

Note: 

 

*  Panasonic takes no responsibility for any damage or malfunction of the product 

resulting from use of lamp units which are not manufactured by Panasonic. Use 
only specified lamp units.

Attention

 

*   Please be sure to read the warnings and notices on the lamp that is described 

in the Operating Instructions. "Read this first!", "Precautions for use", "Mainte-
nance/replacement"

1.  Make sure that the air filter unit is properly attached before using the projector. If it is 

not properly attached, the projector will suck in dirt and dust causing a malfunction.

2.  The cleaning and replacement cycle of the air filter unit varies depending on the us-

age environment.

INF-14

The basic service policy is shown below.

Repair contents

Applied parts

Block replacement 
P.C.Board replacement

 

- Lighting block (* Specified components are replaced)

 

- Optical Block

 

- [P]-P.C.Board (Specified components are replaced)

 

- [BQ]-P.C.Board

 

- Iris unit

Replaced by discrete components

Other electrical parts and mechanism parts

1.  Since very strong light is leakage from the surroundings of optical block, when checking or adjusting the projector with top 

cabinet removal, ware the UV protection glasses to protect the UV light. 

2. Before repairing, make sure to turn off the main power and disconnect the power plug from the power outlet.
  *  When replacing the print board, the internal electrical parts can be broken by the static electricity of clothes or human 

body. Please take care in static electricity, use an antistatic wrist strap or wear the anti-static electricity gloves.

3. After repairing, please check the gradation (10step or the gray scale) test pattern or moving image.
  Also, please check that it is normal on a self check screen.

The lamp cover switch detects whether the lamp cover is mounted securely.
When the lamp cover is mounted securely, the interlock switch (K8S) on the [A]-P.C.Board turns on.

1.  When the replacement of [A]-P.C.Board (assembly) is needed, back up the memory information such as adjustment data 

from the old board to PC with the service software. Then transfer this data to the new [A]-P.C.Board.

  For more information refer to the SECTION 3 "Adjustment".
  * Download the service software from Projector service web site. 
  * The several types of adjustment data have been stored in the memory ICs listed below.

      

IC1391 

 User setting data, Service adjustment data, Model 
No. Serial No.

IC801

 Gamma data, Color shading correction data

2.  When [A]-P.C.Board is replaced, the MAC address of wired LAN and wireless LAN will be changed. Explain it to the cus-

tomers in advance.

Interlock switch (K8S)

INF-15

[Attention] •  When replacing the consumable parts, please make sure that the power cable is disconnected from the outlet.

The lamp unit is a consumable component. Since its brightness gradually decreases over time, it is necessary to replace the 
lamp unit regularly. The estimated duration before replacement is 5 000 hours, but the lamp may go off before reaching to 
5000 hours, depending on the characteristics of the individual lamp, usage conditions, and the installation environment. It is 
recommended that the Replacement Lamp Unit be prepared earlier.

On screen display

REPLACE LAMP

LAMP indicator

On screen display

REPLACE LAMP

LAMP indicator

Over 4 800 hours

The message is displayed for 30 seconds. Pressing 
any button on the control panel or remote control 
within 30 seconds will clear the message.

The indicator lights in red even during the 
standby mode.

Over 5 000 hours

The message remains displayed until you press any 
button.

If you continue to use the lamp unit after 5 000 hours has elapsed, the lamp turns off automatically after approximately 10 
minutes, as it may cause malfunction of the projector.

• To predict when to replace the lamp, check the lamp runtime displayed in [RUNTIME] in [STATUS].
• 5 000 hours of use is a rough guideline, but is not a guarantee. The lamp runtime differs depending on the setting 
   of "LAMP POWER" menu.

The lamp runtime that is displayed in the [STATUS] is real time.
The following conversion is required to calculate the rough estimate for lamp replacement.

 

 

 ="Lamp runtime of [NORMAL]" +  "Lamp runtime of [ECO]" x 5/7

There are 2 types of optical block, named R-type and L-type. 
When replacing the optical block, check the printed marker on the flat cable of the G-LCD panel and use the same type of the 
optical block. If not used the same type, you will find the color shading or wrong white balance picture on the screen. 

• GL => Use L-type optical block
• GR => Use R-type optical block

G-LCD panel

INF-16

Replace the lamp unit after the lamp has cooled (after waiting at least 1 hour).
The high temperature inside the cover will cause burns.

•  A Phillips screwdriver is necessary when replacing the lamp unit.
• Since the luminous lamp is made of glass, it may burst if dropped or hit with a hard object. Handle with care.
• Do not disassemble or modify the lamp unit.
•  When replacing the lamp unit, be sure to hold it by the handle because its surface is pointed and its shape is protruded.
•  The lamp may rapture. Replace the lamp unit carefully so the glass fragments of the lamp do not scatter. While attaching the 

projector to the ceiling, do not work right under the lamp unit or do not conduct work while your face is near the lamp unit.

•  The lamp contains mercury. When disposing of used lamp units, contact your local authorities or dealer for correct methods 

of disposal.

•  While attaching the projector to the ceiling, do not work right under 

the lamp unit or do not conduct work while your face is near the 
lamp unit.

• Do not remove or loosen the screws other than specified ones  
  when replacing the lamp unit.
• Make sure to attach the lamp unit and the lamp cover securely.
•  If the lamp unit is not installed properly, remove it and then push it 

in slowly. Pushing it in quickly or forcibly may break the connector.

  •  Wait at least 1 hour and make sure the lamp unit and surround-

ings are cool.

2) Use a Phillips screwdriver to loosen the lamp cover fixing  
   screw (×1) until it turns freely and remove the lamp cover.
  •  Remove the lamp cover by pulling it slowly toward the direction 

of the arrow.

3) Use a Phillips screwdriver to loosen the three lamp unit  
   fixing screws (×3) until they turn freely.
 
4)  Hold the used lamp unit by its handles, and pull it gently 

 

  •  When you experience difficulty in installing the lamp unit, remove 

it and try again. If you use force to install the lamp unit, the con-
nector may be damaged.

6)  Attach the lamp cover.
   Tighten the lamp cover fixing screw (×1) securely with a  
   Phillips screwdriver.
  •   Perform Step 2) in the reverse order to attach the lamp cover.

•  When you replace the lamp unit with new one, the projector resets 

the runtime of the lamp unit automatically

Lamp cover

Lamp cover fix-
ing screw

Lamp 
unit 
fixing
screws

Handles