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SERVICE MANUAL Model Series:
P50W26
Product Type: PLASMA P50W26B
Chassis: RF-02CA
Manual Series: PV154
Manual Part #: 923-03499
Model Line: E
Product Year: 2002
Y-
AR
IN
IM12/02
EL 12/
-PR
CONTENTS
OVERVIEW ................................................. 5
USERS MENUS ............................................ 9
SERVICING .............................................. 12
PARTS .................................................... 23
DIAGRAMS ...................................................... 25
SCHEMATICS .................................................... 33
Published September 2002
by Technical Publications
Zenith Electronics Corporation
201 James Record Road
Huntsville, Alabama 35824-1513
Copyright 2002 by Zenith Electronics Corporation
Made/Printed
in the U.S.A.
PRODUCT SAFETY GUIDELINES
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-visual service TIPS ON PROPER INSTALLATION
technicians. 1. Never install any receiver in a closed-in recess, cubbyhole, or closely
When servicing this product, under no circumstances should the original fitting shelf space over, or close to, a heat duct, or in the path of heated
design be modified or altered without permission from Zenith Electronics air flow.
Corporation. All components should be replaced only with types identical to 2. Avoid conditions of high humidity such as: outdoor patio installations
those in the original circuit and their physical location, wiring and lead dress where dew is a factor, near steam radiators where steam leakage is a factor,
must conform to original layout upon completion of repairs. etc.
Special components are also used to prevent x-radiation, shock and fire hazard. 3. Avoid placement where draperies may obstruct venting. The customer
These components are indicated by the letter "x" included in their component should also avoid the use of decorative scarves or other coverings that
designators and are required to maintain safe performance. No deviations are might obstruct ventilation.
allowed without prior approval by Zenith Electronics Corporation.
4. Wall- and shelf-mounted installations using a commercial mounting kit
Circuit diagrams may occasionally differ from the actual circuit used. This way, must follow the factory-approved mounting instructions. A product mounted
implementation of the latest safety and performance improvement changes into to a shelf or platform must retain its original feet (or the equivalent
the set is not delayed until the new service literature is printed. thickness in spacers) to provide adequate air flow across the bottom. Bolts
or screws used for fasteners must not touch any parts or wiring. Perform
CAUTION: Do not attempt to modify this product in any way. Never perform leakage tests on customized installations.
customized installations without manufacturer's approval. Unauthorized
modifications will not only void the warranty, but may lead to property damage 5. Caution customers against mounting a product on a sloping shelf or in a
or user injury. tilted position, unless the receiver is properly secured.
Service work should be performed only after you are thoroughly familiar with 6. A product on a roll-about cart should be stable in its mounting to the cart.
these safety checks and servicing guidelines. Caution the customer on the hazards of trying to roll a cart with small
casters across thresholds or deep pile carpets.
GRAPHIC SYMBOLS 7. Caution customers against using a cart or stand that has not been listed
by Underwriters Laboratories, Inc. for use with its specific model of
The exclamation point within an equilateral triangle is intended
television receiver or generically approved for use with TVs of the same or
to alert the service personnel to important safety information in
larger screen size.
the service literature.
8. Caution customers against using extension cords. Explain that a forest of
The lightning flash with arrowhead symbol within an equilateral
extensions, sprouting from a single outlet, can lead to disastrous
triangle is intended to alert the service personnel to the presence
consequences to home and family.
of noninsulated "dangerous voltage" that may be of sufficient
magnitude to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an
equilateral triangle is intended to convey to the service personnel
the following fuse replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED
NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock.
After the original service problem has been corrected, make a check of the
following:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of
adjacent component shorts. This is especially important on items trans-
ported to and from the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers,
shields, strain reliefs, power supply cords, and other hardware have been
reinstalled per the original design. Be sure that the safety purpose of the
polarized line plug has not been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign
particles.
4. Check for physical evidence of damage or deterioration to parts and compo-
nents, for frayed leads or damaged insulation (including the AC cord), and
replace if necessary.
5. No lead or component should touch a receiving tube or a resistor rated at
1 watt or more. Lead tension around protruding metal surfaces must be
avoided.
6. After reassembly of the set, always perform an AC leakage test on all exposed
metallic parts of the cabinet (the channel selector knobs, antenna terminals,
handle and screws) to be sure that set is safe to operate without danger of
electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS
TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in
the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by
a .15 mfd 150V AC type capacitor between a known good earth ground
water pipe, conduit, etc.) and the exposed metallic parts, one at a time.
Measure the AC voltage across the combination of 1500 ohm resistor and
.15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor
and repeat AC voltage measurements for each exposed metallic part. Voltage
measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp
AC. Any value exceeding this limit constitutes a potential shock hazard and
must be corrected immediately.
PV154 - 923-03499 2 P50W26 - SAFETY
TABLE OF CONTENTS
OVERVIEW ........................................................ 5 P50W26 OTHER PCBS ............................ 31
GENERAL INFO ........................................... 5 P50W26 OTHER PCBS ............................ 32
SPECIFICATIONS ..................................... 5 SCHEMATICS ............................................ 33
INSTALLATION ........................................ 5 CIRCUIT .............................................. 33
CONNECTING A COMPUTER ....................... 5 CIRCUIT .............................................. 34
FRONT ................................................... 6 CIRCUIT .............................................. 35
BACK ..................................................... 6 CIRCUIT .............................................. 36
REMOTE CONTROL .................................... 7 CIRCUIT .............................................. 37
SERVICING ................................................ 9 CIRCUIT .............................................. 38
OVERVIEW ............................................. 9 CIRCUIT .............................................. 39
RGB AUTO CUT-OFF & MIN BIAS ................. 9 CIRCUIT .............................................. 40
MAX BIAS ADJUSTMENT ........................... 9 CIRCUIT .............................................. 41
POWER PCB ASSY VOLTAGE ....................... 9
ADJUSTMENT OF WHITE BALANCE ............ 10
DDC DATA INPUT ................................... 11
COMPONENT OFF-SET ADJUSTMENT .......... 11
EXTERNAL CONTROL .................................. 12
OVERVIEW ........................................... 12
CONNECTION ........................................ 12
RS-232C CONFIGURATIONS ..................... 12
SET ID ................................................. 12
COMMUNICATION .................................. 13
NO VIDEO 1 .......................................... 18
NO SOUND ........................................... 18
TROUBLESHOOTING ................................... 19
NO VIDEO 2 .......................................... 19
NO SOUND ........................................... 19
MODEL PARTS ....................................... 20
COMPONENT PARTS ............................... 20
DIAGRAMS ............................................... 27
P50W26 EXPLODED VIEW ....................... 27
P50W26 INTERCONNECT DIAGRAM .......... 28
P50W26 BLOCK DIAGRAM ...................... 29
P50W26 MAIN PCB ............................... 30
PV154 - 923-03499 3 P50W26 - TOC
Overview
OVERVIEW
GENERAL INFO and stands are optional and not supplied with the
monitor. (For further information, refer to the optional
SPECIFICATIONS
Tilt/Wall Mounting Bracket Installation and Setup Guide.)
Screen Size 50 in diagonal
Install this monitor only in a location where adequate
Aspect Ratio 16:9 (width:height) ventilation is available. Minimum allowable clearances for
Max Resolution 1366 x 768p adequate ventilation are show in the picture.
Peak Brightness 230 cd/m (with Filter); CONNECTING A COMPUTER
Module: 510 cd/m2
Connect the video output of the PC to the Monitor RGB-
Contrast Ratio 600:1 PC INPUT (VGA/SVGA/XGA) RGB-DTV INPUT (480p/720p/
Pixel Pitch 0.270 (H) x 0.810 (V) 1080i) using a standard shielded VGA cable. Connect
Viewing Angle 160