PHILIPS 25PT10C121 Technical Service
Philips Consumer Electronics
Technical Service Data
Service Solutions Group
Technical Publications Dept.
P.O. Box 555
401 East Old City Johnson Hwy.
Jefferson City, TN 37760
Manual 7583
Model no.: 25PT10C121
Chassis no.: 25F8
First Publish: 10-9-2000
Rev. Date: 3-21-2001
Print Date: 4/12/2003
TABLE OF CONTENTS
General Information
Training Information
Mechanical Assembly/Disassembly
Mechanical Diagrams
Mechanical Adjustments
Electrical Adjustments
Schematic Diagrams and PCBs
Scope Patterns
Troubleshooting
Service Bulletins and Important Information
Parts List
REFER TO SAFETY GUIDELINES
SAFETY NOTICE: ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE
HIMSELF WITH THE CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS
TO BE USED WHEN SERVICING ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING
Visit our World Wide Web Site at http://www.magnavox.com
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Philips Consumer Electronics
Technical Service Data
Service Solutions Group
Technical Publications Dept.
P.O. Box 555
401 East Old City Johnson Hwy.
Jefferson City, TN 37760
Manual 7583
Model no.: 25PT10C121
Chassis no.: 25F8
First Publish: 10-9-2000
Rev. Date: 3-21-2001
Print Date: 4/12/2003
General Information
REFER TO SAFETY GUIDELINES
SAFETY NOTICE: ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE
HIMSELF WITH THE CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS
TO BE USED WHEN SERVICING ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING
Visit our World Wide Web Site at http://www.magnavox.com
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F8 CHASSIS INTRODUCTION
The F8 chassis is a leader TV chassis produced by Philips Consumer Electronics
Company for the 1999 model year. The F8 chassis is used in sets with 25“ and
27“ screen sizes. The F8 chassis is a global design and is oriented front to rear, or
”north to south“, as it has been called. The F8 chassis tuning system features 181
channels with on-screen display (OSD). The main tuning system uses a tuner, a
microcomputer IC, and a memory IC mounted on the main chassis. The
microcomputer communicates with the memory IC, the customer keyboard,
remote receiver, U/V tuner, signal processor IC and the audio output IC via the
I2C bus. The memory IC retains the settings for favorite stations,
customer-preferred settings, and service/factory data.
The F8 chassis uses a Very Large Scale (VLSI) Integrated Circuit for signal
processing. This IC performs video IF, sound IF processing, AGC control, horizontal
and vertical drive and synchronization, also luminance/chrominance processing. The
on-screen graphics and closed caption decoding are done within the microprocessor,
and then sent to the signal processor IC to be added to the main signal.
The F8 chassis utilizes a switch mode power supply for the main voltage source.
The chassis has a hot chassis ground reference on the primary side of the power
supply, and a cold ground reference on the secondary side of the power supply
and the rest of the chassis. ALWAYS USE AN ISOLATION TRANSFORMER
WHEN SERVICING THIS CHASSIS FOR YOUR SAFETY.
MODEL TO MODULE LIST
The model to Module list shown below identifies all electrical panels, modules
and assemblies used in each model produced with the F8 chassis. This
information was current at time of printing.
Information concerning cabinet parts and cabinet mounted parts (CRT/Yoke/etc.)
is shown in the Cabinet Replacement Parts List.
Replacement part numbers for each module are provided in the Chassis Panel
Replacement Parts List.
If you are attempting to service a model equipped with the F8 chassis, the
necessary electrical information should be covered in this service manual, even if
the corresponding model number is not listed.
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Model
Panel Number Size Description
PHILIPS – MAGNAVOX MODELS
00OCC925-C121 25“
00EMF891 A001 Main Chassis
00A10777-A001 Interface Module
00XR2503-C121 25“
00EMF801-A001, A002 Main Chassis
00TR2503-C121 25“
00EMF801-A001 Main Chassis
00HD2511-C121 25“
00EMF801-A001 Main Chassis
00XS2556-C121 25“
00EMF806-A001, A002 Main Chassis
00TS2556-C121 25“
00EMF806-A001, A002 Main Chassis
0025TS56-C121 25“
00EMF806-A001 Main Chassis
00TR2519-C121 25“
00EMF803-A001 Main Chassis
0025TR19-C121 25“
00EMF803-A001 Main Chassis
00TS2546-C121 25“
00EMF804-A001, A002 Main Chassis
00HD2530-C121 25“
00EMF804-A001 Main Chassis
00OCC927-C101 27“
00EMF893 A001, A102 Main Chassis
00A10777-A001 Interface Module
00TS2575-C121 25“
00EMF807-A001, A002 Main Chassis
00TS2774-C101 27“
00EMF833-A101, A102 Main Chassis
00TS2774-C121 27“
00EMF833-A102 Main Chassis
00TS2746-C101 27“
00EMF830-A101, A102 Main Chassis
00TS2746-C121 27“
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00EMF830-A102 Main Chassis
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00HD2720-C101 27“
00EMF830-A101 Main Chassis
or
00EMF831-A102
00XS2757-C101 27“
00EMF832-A101, A102 Main Chassis
00TS2757-C101 27“
00EMF832-A101 Main Chassis
0027TS57-C101 27“
00EMF832-A101, A102 Main Chassis
0027TS57-C121 27”
00EMF832-A102 Main Chassis
00TS3256-C101 32”
00EMF880-A102 Main Chassis
00TS3256-C121 32”
00EMF880-A002 Main Chassis
25” PHILIPS MODELS
0025PT10-C121 25”
00EMF803-A002 Main Chassis
0025PT15-C121 25”
00EMF806 A002 Main Chassis
PHILIPS – MAGNAVOX CARD SETS
00PC9225-C121 25“
00EMF891-A001, A102 Main Chassis
00A10777-A001 Interface Module
00TC9225-C121 25“
00EMF891-A001, A002 Main Chassis
00A10777-A001 Interface Module
PHILIPS - LATIN AMERICA
0026LL59-1121 25“
00EMF821-A001 Main Chassis
PHILIPS - LATIN AMERICA - AMV
0026LW59-3221 25“
00EMF823-A001 Main Chassis
0029LL69-1121 27“
00EMF851-A001 Main Chassis
PHILIPS LATIN AMERICA - 110V
0026LL59-0121 25“
00EMF820-A001, A002 Main Chassis
0026LW59-2221 25“
00EMF822-A001, A002 Main Chassis
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0029LL69-0121 27“
00EMF850-A001, A002 Main Chassis
PHILIPS – INDUSTRIAL TELEVISION - SMARTPORT
00LL9125-C121 25”
00EMF899-A002 Main Chassis
00TL9125-C121 25“
00EMF890-A001, A002 Main Chassis
00PL9125-C121 25“
00EMF890-A001, A002 Main Chassis
00TL9127-C101 27“
00EMF892-A101, A102 Main Chassis
00CH1927-C101 27”
00EMF893-A102 Main Chassis
00A10680-B002 Channel One Card
00A10777-A001 Interface Module
00PA9027-C101 27”
00EMF894 A102 Main Chassis
00AVJ250 A001 Pro video Card Assembly
00A10757 A001 L9 Audio Jack Panel
00A10778 A001 L9 ITV Front A-V
00A10791 A001 Comb Filter Panel
00A10808 A001 Pro Plus Interface
00PL9127-C101 27“
00EMF892-A101, A102 Main Chassis
00PPC927-C101 27”
00EMF894 A102 Main Chassis
00A10791 A001 Comb Filter Panel
00A10757 A001 L9 Audio Jack Panel
00A10778 A001 L9 ITV Front A/V
00A10808 A001 Pro Plus Interface
00SCN927-C101 27”
00EMF894 A102 Main Chassis
00A10757 A001 L9 Audio Jack Panel
00A10777 A001 Interface Module
00A10778 A001 L9 ITV Front A/V
00A10791 A001 Comb Filter Panel
00PA9032-C101 32”
00EMF895 A102 Main Chassis
00AVJ250 A001 Pro video Card Assembly
00A10757 A001 L9 Audio Jack Panel
00A10791 A001 Comb Filter Panel
00A10808 A001 Pro Plus Interface
00PPC932-C101 32” Philips
00EMF895 A102 Main Chassis
00A10757 A001 L9 Audio Jack Panel
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00A10791 A001 Comb Filter Panel
00A10808 A001 Pro Plus Interface
Remote
Replacement
Remote Drawing RC0702
00TR2503-C121 X
0025TR19-C121 X
0025TS56-C121 X
0026LL59-0121 X
0026LL59-1121 X
0026LW59-2221 X
0026LW59-3221 X
0027TS57-C101 X
0029LL69-0121 X
0029LL69-1121 X
00HD2511-C121 X
00HD2530-C121 X
00HD2720-C101 X
00TL9125-C121 X
00TL9127-C101 X
RC0702/04
3139 148
54201
RCO705/00
3139 228
80571
RC0705
-------------
RC282901/01
3139 228
81441
Philips
RCL9UB RCL9UB RCU82C
RC282901/04
3139 228
81451
PH/MX
RC2524/04
3139 228
81591
RC2528/04
3139 228
82051
RCU82D
-------------
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00SCN932C101 32” Philips
00EMF895 A102 Main Chassis
00A10757 A001 L9 Audio Jack Panel
00A10777 A001 Interface Module
00A10791 A001 Comb Filter Panel
PHILIPS INDUSTRIAL TELEVISION - CARD SET
00PC9227-C101 27“ Philips
00EMF893-A101, A102 Main Chassis
00A10777-A001 Interface Module
SC2932C121 32" Philips
313501700770 Scan Card
00A10808 A001 Pro Plus Interface
00A10757 A001 Audio Jack Panel
00AVJ222 A001 Scan Converter Card
00A10654 A001 Scan Converter Jack Panel
00EMF895 A002 Main Chassis
00A10791 A001 Comb Filter Panel
Remote
Replacement
Remote Drawing RC0702
00TR2503-C121 X
0025TR19-C121 X
0025TS56-C121 X
0026LL59-0121 X
0026LL59-1121 X
0026LW59-2221 X
0026LW59-3221 X
0027TS57-C101 X
0029LL69-0121 X
0029LL69-1121 X
00HD2511-C121 X
00HD2530-C121 X
00HD2720-C101 X
00TL9125-C121 X
00TL9127-C101 X
00TR2519-C121 X
00TS2546-C121 X
00TS2556-C121 X
00TS2575-C121 X
RC0702/04
3139 148
54201
RCO705/00
3139 228
80571
RC0705
-------------
RC282901/01
3139 228
81441
Philips
RCL9UB RCL9UB RCU82C
RC282901/04
3139 228
81451
PH/MX
RC2524/04
3139 228
81591
RC2528/04
3139 228
82051
RCU82D
-------------
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MODEL TO REMOTE CROSS-REFERENCE
Remote
Replacement
Remote Drawing RC0702
00TR2503-C121 X
0025TR19-C121 X
0025TS56-C121 X
0026LL59-0121 X
0026LL59-1121 X
0026LW59-2221 X
0026LW59-3221 X
0027TS57-C101 X
0029LL69-0121 X
0029LL69-1121 X
00HD2511-C121 X
00HD2530-C121 X
00HD2720-C101 X
00TL9125-C121 X
00TL9127-C101 X
00TR2519-C121 X
00TS2546-C121 X
00TS2556-C121 X
00TS2575-C121 X
00TS2746-C101 X
00TS2757-C101 X
00TS2774-C101 X
00XR2503-C121 X
00XS2556-C121 X
00XS2757-C101 X
00OCC925-C121
00OCC927-C101
00PC9225-C121
00PC9227-C101
00PL9125-C121
00PL9127-C101
00TC9225-C121
RC0702/04
3139 148
54201
No Remote
No Remote
No Remote
No Remote
No Remote
No Remote
No Remote
RCO705/00
3139 228
80571
RC0705
-------------
RC282901/01
3139 228
81441
Philips
RCL9UB RCL9UB RCU82C
RC282901/04
3139 228
81451
PH/MX
RC2524/04
3139 228
81591
RC2528/04
3139 228
82051
RCU82D
-------------
(Display Quick-Use Guide for RC0702 Transmitter)
(Display Quick-Use Guide for RCU82C Transmitter)
(Display Quick-Use Guide for RCL9UB Transmitter)
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MODEL TO JACKPANEL CROSS-REFERENCE
(Display JP9000 Jack Panel)
(Display JP9103 Jack Panel)
(Display JP9106 Jack Panel)
Models Jack Panels
JP9000 JP9103 JP9106
00TR2503-C121
0025TR19-C121 X
0025TS56-C121 X
0026LL59-0121 X
0026LL59-1121 X
0026LW59-2221 X
0026LW59-3221 X
0027TS57-C101 X
0029LL69-0121 X
0029LL69-1121 X
00HD2511-C121 X
00HD2530-C121 X
00HD2720-C101 X
00TR2503-C121 X
00TR2519-C121 X
00TS2546-C121 X
00TS2556-C121 X
00TS2575-C121 X
00TS2746-C101 X
00TS2757-C101 X
00TS2774-C101 X
00XR2503-C121 X
00XS2556-C121 X
00XS2757-C101 X
00TL9125-C121
00TL9127-C101
00OCC925-C121
00OCC927-C101
00PC9225-C121
00PC9227-C101
00PL9125-C121
00PL9127-C101
00TC9225-C121
X
No Jack Panel
No Jack Panel
No Jack Panel
No Jack Panel
No Jack Panel
No Jack Panel
No Jack Panel
No Jack Panel
No Jack Panel
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GLOSSARY OF TERMS, ACRONYMS, AND ABBREVIATIONS
2CS Two Channel Stereo
AFC Automatic Frequency Control
AFT Automatic Fine Tuning
AP Asia Pacific
ATS Automatic Tuning System
AV External Audio/Video
AVL Automatic Volume Level control
BTSC Broadcast Television Standard Committee (TV Stereo)
CBA Circuit Board Assembly (PCB)
CC Closed Captioning
CSM Customer Service Mode
CVBS Color Video Blanking Sync
DNR Dynamic Noise Reduction
EEPROM Electrical Erasable Programmable Read-Only Memory
Error Buffer Register that keeps track of errors that occur and stores error codes
Error Code A numerical value used to indicate a failure in the television
EU Europe
EXT External audio/video input
FM Frequency Modulation
I²C Inter IC bus, 2-wire bi-directional (SCL/SDA)
ID Identification
IDENT Horizontal coincidence signal, transmitter identification
IF Intermediate Frequency
IN ITT sound IC with NICAM function
IT ITT sound IC without NICAM function
LATAM Latin America
LED Light Emitting Diode
Local Keyboard The buttons (usually volume up, volume down, channel up, and channel down)
located on the front of the television set
MA Mono All; single mono carrier receiver
NR Noise Reduction
NTSC National Television Systems Committee (video)
NVM Non Volatile Memory
OB Option Byte (Feature Byte)
OSD On Screen Display
PCB Printed Circuit Board (CBA)
PIP Picture In Picture
PLL Phase Locked Loop
PP Personal Preference
RAM Random Access Memory
RC Remote Control
RC-5 Remote Control system 5
RGB Red Green Blue
ROM Read Only Memory
SAM Service Alignment Mode
SAP Second Audio Program
SCL Serial Clock
SDA Serial Data
SDM Service Default Mode
SVHS Super Video Home System
Top Level Menu This refers to the main menu (as opposed to sub menus) in SAM
V-Chip Violence-Chip
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VCR Video Cassette Recorder
Y/C Luminance/Chrominance (video)
SAFETY INSTRUCTIONS FOR REPAIRS
1. Safety regulations require that during a repair:
• the set should be connected to the mains via an isolating transformer
• safety components, indicated by the symbol s , should be replaced by components
identical to the original ones
• when replacing the CRT, safety goggles must be worn
2. Safety regulations require that after a repair the set must be returned in its original
condition. In particular, attention should be paid to the following points:
Note:
This resoldering is advised to prevent bad connections due to metal fatigue in solder
joints, and is therefore only necessary for television sets older than 2 years.
• As a strict precaution, we advise you to resolder the solder joints through which the
horizontal deflection current is flowing, in particular:
- All pins of the line output transformer (LOT)
- flyback capacitor(s)
- S-correction capacitor(s)
- line output transistor
- pins of the connector with wires to the deflection coil
- other components through which the deflection current flows
• Resolder points are marked by a white circle on the bottom of the CBA.
• The wire trees and EHT cable should be routed correctly and fixed with the
mounted cable clamps.
• The insulation of the mains lead should be checked for external damage.
• The mains lead strain relief should be checked for its function in order to avoid
touching the CRT, hot components or heat sinks.
• The electrical DC resistance between the mains plug and the secondary side
should be checked (only for sets which have a mains isolated power supply).
This check can be done as follows:
- unplug the mains cord and connect a wire between the two pins of the mains
plug
- set the mains switch to the on position (keep the mains cord unplugged!)
- measure the resistance value between the pins of the mains plug and the
metal shielding of the tuner or the aerial connection on the set. The reading
should be between 4.5 Megohm and 12 Megohm.
- switch off the TV and remove the wire between the two pins of the mains plug
• The cabinet should be checked for defects to avoid touching of any inner parts by
the customer.
JP9000 JP9103 JP9106 JP9202 JP9204 JP9403 JP9406 JP9410 JP9411 JP9519 JP9523
RF Input/
Antenna
Jacks
Quantity
Video
Input
75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 2 x 75
ohm
0 3 6 2 4 3 7 10 11 19 23
1 1 1 1 1 1 2 2 3 3
2 x 75
ohm
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JACK PANEL DEFINITIONS
JP9000 JP9103 JP9106 JP9202 JP9204 JP9403 JP9406 JP9410 JP9411 JP9519 JP9523
RF Input/
Antenna
Jacks
Quantity
Video
Input
Audio
Input
SVHS
Input
ead-phon Front Front Front Front Side Side
Surround
Sound
Speaker
Video Out 1 1 1 1 1 1
Audio
Output
Smart
Plug
CH. 1
Demod.
Theft
Control
Pillow
Control
Guide +
Gold
YUV
Comp. In
"* Only one set of audio output jacks, menu selectable, switchable between fixed and variable output"
75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 2 x 75
0 3 6 2 4 3 7 10 11 19 23
1 1 1 1 1 1 2 2 3 3
L-R L-R 1 L-R 1 L-R 2 (L-R) 2 (L-R) "3(L-R)
Out
L-R
(Fixed)
L-R
(Fixed)
L-R
(Fixed)
1 2
L-R
(Fixed)
ohm
2-Rear,
1-Side"
(1-Rear/
1-Side)
(1-Rear/
L-R* L-R*
1 1
3 3
2 x 75
ohm
"3(L-R)
2-Rear,
1-Side"
2
1-Side)
4
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MAIN CHASSIS SCHEMATIC NOTES:
UNLESS OTHERWISE SPECIFIED:
1. ALL VOLTAGES AND WAVEFORMS WERE TAKEN UNDER THE FOLLOWING
CONDITIONS:
- LINE VOLTAGE MAINTAINED AT 120VAC, 60Hz VIA AN ISOLATION
TRANSFORMER.
- SET IN SDM (SERVICE DISPLAY MODE). To enter SDM, press 0-6-2-5-9-6-Menu
on the remote control.
- ALL VOLTAGES WERE TAKEN FROM MODEL TS2774C101.
2. ALL WAVEFORMS WERE TAKEN WITH AN NTSC SIGNAL GENERATOR
DELIVERING 10mVp-p AT THE ANTENNA INPUT.
3. ON VOLTAGE CHARTS:
- VOLTAGES IN THE "Signal" COLUMN WERE TAKEN WITH AN NTSC SIGNAL
GENERATOR DELIVERING 10mVp-p AT THE ANTENNA INPUT.
- VOLTAGES IN THE "No Signal" COLUMN WERE TAKEN WITH NO SIGNAL
APPLIED.
- VOLTAGES IN THE "Standby" COLUMN WERE TAKEN WITH THE SET IN
STANDBY MODE (Power supplied to the chassis, set turned off).
4. ALL VOLTAGES ARE POSITIVE DC WITH RESPECT TO GROUND IN THAT
SECTION OF THE CHASSIS, AND MAY VARY DUE TO NORMAL PRODUCTION
TOLERANCES.
5. COMPONENT AND SPECIAL SYMBOLS:
* INDICATES A COMPONENT WHICH WILL VARY DEPENDING ON SCREEN
SIZE, PRODUCTION DATES, AND OPTION FEATURES INSTALLED. PLEASE
SEE THE REPLACEMENT PARTS LIST FOR SPECIFIC PART INFORMATION.
• INDICATES A COMPONENT IS AN SMD ”CHIP“ TYPE COMPONENT, AND AS
SUCH WILL BE LOCATED ON THE BOTTOM Side OF THE CBA.
6. A HIGH VOLTAGE OSCILLOSCOPE PROBE (100:1) IS NEEDED TO MEASURE THE
WAVEFORM AT THE HORIZONTAL OUTPUT TRANSISTOR (PART # 7620).
7. SPARK GAPS SHOWN ON THE CRT SCHEMATIC ARE INTERNAL TO THE CRT
SOCKET.
8. THE NUMBERS 1a THROUGH 38b, SHOWN IN ENCLOSED BOXES,
CORRESPOND TO THE WAVEFORM PHOTOGRAPHS.
9. FOR VOLTAGE, WATTAGE, AND TOLERANCE RATINGS OF RESISTORS AND
CAPACITORS, PLEASE SEE THE ELECTRICAL REPLACEMENT PARTS LIST.
10. INDICATES PCE REPLACEMENT PART NUMBER ONLY.
MAIN CHASSIS WAVEFORM NOTES:
UNLESS OTHERWISE SPECIFIED:
ALL WAVEFORMS WERE TAKEN UNDER THE FOLLOWING CONDITIONS:
- LINE VOLTAGE MAINTAINED AT 120VAC, 60Hz VIA AN ISOLATION
TRANSFORMER.
- SET IN SDM (SERVICE DISPLAY MODE). TO ENTER SDM, PRESS
0-6-2-5-9-6-MENU ON THE REMOTE CONTROL.
- ALL WAVEFORMS WERE TAKEN FROM MODEL TS2774-C101.
- ALL WAVEFORMS WERE TAKEN WITH AN NTSC SIGNAL GENERATOR
DELIVERING 10mVp-p AT THE ANTENNA INPUT.
- SWEEP TIME/CM SETTINGS ARE SHOWN WITH THE FIGURES IN THE
CALIBRATED POSITION.
- THE ACTUAL SWEEP TIMES AND VOLTAGES PRESENT ARE SHOWN
WHEREVER POSSIBLE.
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- COMPOSITE VIDEO SIGNALS ARE SHOWN WITHOUT SWEEP TIME AND
VOLTAGES PRESENT BECAUSE THESE SIGNALS HAVE VARIABLE SWEEP
TIMES AND VOLTAGES.
- A HIGH VOLTAGE OSCILLOSCOPE PROBE (100:1) IS NEEDED TO MEASURE
THE WAVEFORM AT THE HORIZONTAL OUTPUT TRANSISTOR (PART #
7460).
- THE DESIGNATORS A1a THROUGH V6c, SHOWN IN ENCLOSED BOXES,
CORRESPOND TO THE WAVEFORM PHOTOGRAPHS.
AUDIO WAVEFORM NOTES:
THESE NOTES APPLY ONLY TO THE AUDIO WAVEFORMS (A1a THROUGH A3d).
AUDIO WAVEFORMS WERE TAKEN UNDER THE FOLLOWING CONDITIONS:
- ALL WAVEFORMS WERE TAKEN WITH A LEADER LMS-238 SOUND
GENERATOR CONNECTED AT THE ANTENNA INPUT, WITH THE FOLLOWING
SETTINGS:
- INT FREQUENCY SET TO 1kHz
- STEREO (L+R), PILOT ON
- VIF/RF OUTPUT AT CHANNEL 3
- ALL WAVEFORMS WERE TAKEN FROM MODEL TS2774C101.
- TELEVISION SET TO CHANNEL 3 IN NORMAL MODE.
- DO NOT MUTE THE SET.
- SET THE TELEVISION VOLUME AT 40.
- THE SPEAKERS MAY BE DISCONNECTED AT CONNECTOR #0234 (BOARD
LOCATION B-1) IF THE AUDIO OUTPUT CAUSES A DISTRACTION TO THE
SERVICER.
F8 CHASSIS FEATURE LISTING
USA/CANADIAN CHASSIS LISTINGS
LATIN AMERICAN CHASSIS LISTINGS
INDUSTRIAL CHASSIS LISTINGS
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(Display Quick-Use Guide for RC0702 Transmitter)
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(Display Quick-Use Guide for RCU82C Transmitter)
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(Display Quick-Use Guide for RCL9UB Transmitter)
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(Display JP9000 Jack Panel)
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(Display JP9103 Jack Panel)
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(Display JP9106 Jack Panel)
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Philips Consumer Electronics
Technical Service Data
Service Solutions Group
Technical Publications Dept.
P.O. Box 555
401 East Old City Johnson Hwy.
Jefferson City, TN 37760
Manual 7583
Model no.: 25PT10C121
Chassis no.: 25F8
First Publish: 10-9-2000
Rev. Date: 3-21-2001
Print Date: 4/12/2003
Training Information
REFER TO SAFETY GUIDELINES
SAFETY NOTICE: ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE
HIMSELF WITH THE CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS
TO BE USED WHEN SERVICING ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING
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F8 CHASSIS INTRODUCTION
The F8 chassis is a leader TV chassis produced by Philips Consumer Electronics Company for the
1999 model year. The F8 chassis is used in sets with 25“ and 27“ screen sizes. The F8 chassis is a
global design and is oriented front to rear, or ”north to south“, as it has been called. The F8 chassis
tuning system features 181 channels with on-screen display (OSD). The main tuning system uses a
tuner, a microcomputer IC, and a memory IC mounted on the main chassis. The microcomputer
communicates with the memory IC, the customer keyboard, remote receiver, U/V tuner, signal
processor IC and the audio output IC via the I2C bus. The memory IC retains the settings for favorite
stations, customer-preferred settings, and service/factory data.
The F8 chassis uses a Very Large Scale (VLSI) Integrated Circuit for signal processing. This IC
performs video IF, sound IF processing, AGC control, horizontal and vertical drive and synchronization,
also luminance/chrominance processing. The on-screen graphics and closed caption decoding are
done within the microprocessor, and then sent to the signal processor IC to be added to the main
signal.
The F8 chassis utilizes a switch mode power supply for the main voltage source. The chassis has a hot
chassis ground reference on the primary side of the power supply, and a cold ground reference on the
secondary side of the power supply and the rest of the chassis. ALWAYS USE AN ISOLATION
TRANSFORMER WHEN SERVICING THIS CHASSIS FOR YOUR SAFETY.
SIGNAL FLOW DESCRIPTION
(Display Signal Flow Block Diagram)
The incoming RF signal is applied to the U/V tuner where the 45.75 MHz IF signal is developed and
amplified. The IF signal then exits the tuner from pin11to pass through the SAW filter, (1003). The
shaped signal is then applied to IC 7250, the IF processor. The automatic gain control (AGC) is
performed in IC 7250 and applied to the U/V tuner at pin1. An automatic fine tuning signal (AFT) is also
generated in the IC and then routed to the tuning system via the I2C bus, to provide frequency
correction as needed.
The IF signal exits IC 7250 at pin 6, the audio and video signals are separated and each processed
accordingly. The sound IF signal enters IC 7250 at pin 1, while the video re-enters at pin 13. The audio
signal passes through the pre-amp, volume control and volume limiting circuits before application to the
final audio stages.
The video signal entering at pin 13, is separated into its luminance and chrominance components, and
exits at pins 21, 20, and 19 as R, G, and B respectively. The R G B signals are sent to the CRT DRIVE
board, amplified and applied to the CRT pins as drive. Drive and cutoff controls for the CRT are also
located on this board.
Brightness, Picture, Sharpness, Color and Tint control voltages are varied by the microprocessor, IC
7600 through individual control lines. IC 7600 also controls selected inputs, as selected by the
consumer.
Video and audio muting are an internal function of IC 7250. Automatic volume limiting also takes place
inside this IC.
Vertical and Horizontal drive signals are also developed inside IC 7250. Vertical drive exits the IC from
pin 47, while Horizontal drive exits at pin 40. These signals are a product of a Voltage Controlled
Oscillator Circuit (VCO) and divider network located inside the chip. Vertical drive is applied to pin 1 of
IC 7401, amplified, shaped, and output from pin 5 where it is applied to the vertical winding of the yoke.
A feedback signal is returned to pin 46 of IC 7250. The vertical sync pulse is also applied to the
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microprocessor, IC 7600, to pin 37 for On-Screen Display and Closed-Captioning synchronization. The
horizontal drive signal exits IC 7250 from pin 40 and is applied to Q 7461, the horizontal driver
transistor. The signal is amplified and coupled to the base circuit of Q 7460, the horizontal output
transistor. The H.O.T. drives the Integrated Flyback Transformer, which provides high voltage, screen
voltage, focus, G-2, and filament voltages for the CRT. A scan-derived power supply is also provided by
the IFT. It supplies -13 volts, +13 volts, +50 volts, a secondary +5 volt supply, and a +200 volt source for
video drive. The secondary of the IFT is monitored by safety circuits and is tied back to the
microprocessor and signal-processing IC’s to turn the set off if a problem should occur.
POWER SUPPLY DESCRIPTION
(Display Power Supply Block Diagram)
The F8 chassis family uses a free-running switch-mode power supply with a single controller IC. As AC
power is applied to the set, approximately 160volts DC is developed by the bridge rectifiers and fed to
the primary winding of the power transformer, then to the FET switch. The start voltage for the power
supply is taken from the hot leg of the AC input. This voltage goes to controller IC 7520. A separate
operating voltage is developed from the power transformer, rectified, and applied to IC 7520. The power
supply is on all the time; there is no standby mode. The set is turned on and off by the microprocessor
switching the +8 volt regulator on and off. The +8 volt is the supply voltage for the signal processor.
IC7520 is regulated by means of a feedback circuit, monitoring the +11 volt secondary line. Any voltage
variations are reflected back to the controller IC 7520 through an Opto-Coupler IC and change the
operating frequency of the power supply as needed. REMEMBER TO USE AN ISOLATION
TRANSFORMER WHEN SERVICING THIS CHASSIS.
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(Display Signal Flow Block Diagram)
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(Display Power Supply Block Diagram)
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Philips Consumer Electronics
Technical Service Data
Service Solutions Group
Technical Publications Dept.
P.O. Box 555
401 East Old City Johnson Hwy.
Jefferson City, TN 37760
Manual 7583
Model no.: 25PT10C121
Chassis no.: 25F8
First Publish: 10-9-2000
Rev. Date: 3-21-2001
Print Date: 4/12/2003
Mechanical Assembly
REFER TO SAFETY GUIDELINES
SAFETY NOTICE: ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE
HIMSELF WITH THE CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS
TO BE USED WHEN SERVICING ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING
Visit our World Wide Web Site at http://www.magnavox.com
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DISASSEMBLY INTRODUCTIONS
(Display Cabinet Back Removal Illustration)
(Display Main Chassis Removal Illustration)
(Display Service Position Illustration)
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