Text preview for : philips_g7_training_manual.pdf part of Philips philips g7 training manual Philips TV philips_g7_training_manual.pdf
Back to : philips_g7_training_manua | Home
PSSG
PHILIPS SERVICE SOLUTIONS GROUP
PHILIPS TECHNICAL
TRAINING
G7
COLOR TV
CHASSIS
P H I L I P S Philips Technical Training (USA)
401 E. Old Andrew Johnson hwy
TECH
TRAINING
PO box 555
Jefferson City, TN 37760
VIDEOT A P E S PH: 865-475-0397
FAX: 865-475-0221
MANUALS
EMAIL: [email protected]
TABLE OF CONTENTS
CUSTOMER SERVICE MODE 13
EAST WEST CORRECTION CIRCUIT 11
HORIZONTAL OUTPUT CIRCUIT 9
INTRODUCTION 1
MICROPROCESSOR CIRCUIT 11
POWER SUPPLY BLOCK 5
POWER SUPPLY 8
SERVICE ALIGNMENT MODE 13
SERVICE DEFAULT MODE 11
SIGNAL FLOW 1
TROUBLESHOOTING FLOW 15
G7 COLOR TV CHASSIS signal within the TV Signal
Processor. Automatic Volume Level
INTRODUCTION (Figure 1) (AVL) control from the
microcomputer is sent to the
The G7 chassis is a high end TV Stereo Decoder IC via the I2C bus.
chassis produced by Philips
Consumer Electronics Company for The G7 chassis features a
the 1999-2000 model year. The G7 Switching Mode Power Supply for
chassis is used in TV sets with the voltage source. A "HOT"
27, 32, and 36 inch screen sizes. ground reference is used in the
The G7 Tuning System features 181 primary side of the power supply.
channel tuning with On-Screen "COLD" (signal) ground is used
display. In the two tuner from the secondary of the power
version, the second Tuner and IF supply throughout the rest of the
circuits are located on the PIP chassis. AN ISOLATION TRANSFORMER
module. The Tuning System uses IS REQUIRED WHEN DOING SERVICE ON
two ICs mounted on the main ANY VERSION OF THE NEW CHASSIS.
chassis, which include a
microcomputer IC and a memory IC. SIGNAL FLOW
The microcomputer communicates
with the Memory IC, the Customer The incoming RF signal is applied
Keyboard, the Remote Receiver, the to the U/V Tuner via the Antenna
U/V Tuner, the Signal Processor, and RF input. The 45.75MHz IF
the Stereo Decoder, the PIP signal is developed within the U/V
module, the Side Jack Panel Tuner, then amplified by an IF
(optional), the Comb Filter module Preamplifier located inside the
and the Power On/Off circuitry. Tuner. The amplified IF signal is
The Memory IC retains the settings sent from Pin 1 of the U/V Tuner
for favorite station, customer to Pin 1 of the SAW filter 1145.
control settings, and Factory The SAW filter produces bandpass
Setup data. shaping for the IF signal before
it is applied to the TV Signal
The chassis features a Very Large Processing Integrated Circuit 7150
Scale Integration (VLSI) IC for TV Pins 48 and 49 for Processing.
signal processing. This IC AGC voltage is developed within
performs video IF, AFT/AGC 7150 and sent to the Tuner for RF
control, horizontal/vertical Amplifier gain control. The AFT
synchronization, Chrominance/ (to the Microcomputer) signal is
luminance processing, and video developed within IC 7150 and sent
switching between internal and to the Microcomputer via the I2C
external inputs in versions bus for Tuner Oscillator frequency
without a PIP module. On-Screen correction.
Graphics generation and Closed
Caption decoding are done within Video switching by the Rear Jack
the Microcomputer with signals panel is accomplished by the
being sent to the TV signal Microcomputer via SEL_MAIN_R1R2
processor. The On-Screen Graphics and SEL_PIP_R1_R2. The Rear Jack
information is placed on the main panel selects between Video1 or
page 1
FIGURE 1 - OVERALL BLOCK DIAGRAM page 2
Video2 as the signal source for buffer by transistor 7161. In the
the outputs Y_Video_RR or one Tuner PIP or in the non-PIP
Video_PIP_RR. The SVHS input is version, the video signal is
connected to the Video1 input. passed through jumper 9163. In
The Y_Video_RR output of the Rear the two Tuner version, video is
Jack can either be composite video passed through resistor 3173 to
from Video1 or Video 2. If the the Video PIP input of the PIP
selected Video1 input is from the module. The PIP module selects
SVHS Jack, this is a luminance either the Video from IC 7150, or
signal. The Y_Video_RR is fed to from the second Tuner located on
switching IC 7250, which selects the PIP module. The second Tuner
between Y_Video_RR or Y-CVBS_FRT on the PIP module has its own IF
from the Side Jack panel. If the circuit. The SEL_Video in the
input to the Side Jack panel is two-tuner version is then fed back
from an SVHS source and this to the input of the 4.5 MHz trap
source is selected by the user as 1167. SEL_Video is fed to the
the PIP window, the YC is fed to Stereo decoding circuit for audio
a YC adder. IC 7250 then selects processing. The signal is
between the output of the YC adder buffered again by transistor 7170
or the Video_PIP_RR source from before being passed to Pin 13 of
the Rear Jack panel. This 7150. In the single tuner
Composite signal is then buffered version, video is passed through
by transistor 7270 and becomes resistor 3172 to the Video_ PIP
Video_PIP_EXT. This Composite input of the PIP module if this
video is fed to the PIP module source is selected for the PIP
where it is used as the source for window. The switch inside 7150
the PIP window. Selected selects between the output of 7170
Composite video for the main or Y_Video_ext for either the
picture from 7250 is buffered by single or two tuner versions. The
transistor 7255. It becomes Internal/External switch of IC
Y_Video_ext and is then fed to the 7150 is controlled by the
Comb Filter panel and Pin 17 of IC Microcomputer via the I2C bus.
7150 Signal Processor. Chroma Selected video from IC 7150 on Pin
C_RR from the Rear Jack panel's 38 is buffered by transistor 7176
SVHS jack is fed to 7250, which where it is sent to the
selects between C_RR and C_FRT. Input/Output (I/O) panel, the Comb
This signal is then buffered by filter, and the Video Text input
transistor 7255 becoming C_ext of the Microcomputer. The I/O
before being fed to the Comb panel has an external jack for
Filter module. Video_PIP_RR from video output. The Comb filter
the Rear Jack panel is also fed to separates the video into Y
7250, which selects between (Luminance) and C (Chroma)
Video_PIP_RR or the output of the signals. If the SVHS input is
YC adder. This signal is then selected the Y signal is fed to
buffered by transistor 7270 and the Comb filter via the
becomes Video_PIP_ext and is fed Y_Video_ext line and the C signal
to the PIP module. is fed to the Comb filter on the
C_EXT line. The Comb On/Off line
Composite video from 7150 Pin 6 is
page 3
from Pin 33 of 7150 switches the Tint control voltages are
Comb Filter between VIDEO_MON and developed within IC 7150 from the
the SVHS input. In the PIP Tuning System Microcomputer, IC
versions, the Y and C signals are 7000, via the I2C bus. The Red,
sent to the PIP module. The PIP Green, and Blue signals developed
circuit selects as the main by the signal processor 7150 from
picture the YC signals from the Pins 21, 20, and 19 are applied to
Comb filter. The YC signals from the CRT board. On the CRT board,
the PIP module are then looped these signals are amplified before
through the Comb filter module to being applied to the CRT.
Pins 11 and 10 of IC 7150. In
the non-PIP version, the Y and C The Drive and Cutoff controls for
signals are sent to pins 11 and 10 the CRT set-up are controlled
of IC 7150 from the Comb filter. within IC 7150 and are set by the
The Chroma signal on Pin 10 is fed Microcomputer IC 7000 via the I2C
to an internal Demodulator inside bus. Adjustments are performed
7150. B-Y and R-Y signals with the set in the Service Test
developed by the Demodulator and Mode. Always use the procedures
output on Pins 29 and 30. The Y given in the Service Manual for
or Luminance signal on Pin 11 is setting up the CRT circuits (White
looped through 7150 to Pin 28. In Balance). The Drive controls are
sets with the YUV panel, Y, B-Y, adjusted for proper mixing of the
and R-Y are fed to the YUV panel. Luminance and Chrominance signals.
The YUV panel then selects between The Cutoff Controls provide
the output of 7150 or the YUV adjustment of the bias level for
signal from the Rear Jack panel. the CRT cutoff values.
The Y, B-Y, and R-Y signals from
the YUV panel are fed to Pins 27, Horizontal and Vertical signals
31, and 32 of IC 7150. The YUV are developed within IC 7150.
panel is a Histogram circuit, Adjustments for Horizontal
which processes the Luminance to Centering, Vertical Centering,
set the black bias level. In sets AFT, and Vertical Height are done
without the YUV panel, the Y, R-Y, with the Remote Transmitter via
and B-Y signals are fed through the Service Test Mode. There is
jumpers 4225, 4226, and 4227. no adjustment for the Horizontal
Oscillator. The Horizontal
Red, Green, and Blue On-Screen circuit is a count down type of
display signals from the system that gets its base
Microcomputer IC 7000 Pins 34, 33, frequency from the 3.58MHz
and 32 are fed to the Signal circuit.
Processor 7150 Pins 23, 24, and
25. Fast blanking from IC 7000 When the set is turned On, a High
Pin 35 is fed to IC 7150, Pin 26. is output from IC 7000 Pin 20 to
The On-Screen signals are applied turn On the switched +8 volt
to the Red, Blue, and Green supply. The +8 volt supply
signals developed in the signal provides voltage to Pin 37 of IC
processor matrix. Brightness, 7150 to the Horizontal oscillator.
Picture, Sharpness, Color, and The Horizontal drive on Pin 40
page 4
drives transistor 7610. The PROT_E_W_VERT line monitors
three points to shut down the set
Horizontal drive from transistor in case of a problem. Transistor
7610 coupled through the Driver 7716 monitors the Vertical output
Transformer 5611 to drive the circuit for failure. The IFT
Horizontal Output transistor 7620. circuit is monitored for
The Horizontal Output transistor overvoltage. A circuit on the EW
7620 drives the IFT and Horizontal panel monitors for a failure of
Yoke. The IFT develops the high horizontal sweep. A failure at
voltage, focus voltage, and any one of the three points will
filament voltage for the picture place a High on the PROT_E_W_VERT
tube. Scan derived voltages line turning On transistor 7041
provided by the IFT for use by the causing Pin 11 of Microcomputer
chassis are the G2, +200, +13, and 7000 to go Low, turning the set
-13 volt. Off. In the case of an
Overcurrent condition in the IFT
The Vertical signal output from IC circuit, the PROT line which
7150, Pin 47, is applied to the monitors the EHT_INFO (DAG) line
vertical output IC 7700. The will go High. This voltage is
vertical signal output from IC applied to Pin 50 of the Signal
7700 is applied to the Vertical Processor 7150. If this voltage
Yoke. Feedback from the vertical goes above 3.9 volts, 7150 will
circuit is fed to IC 7150, Pin 46. detect the increase. This
Vertical output on Pin 3 of 7700 information will be communicated
is buffered by transistor 7715 to to the Microcomputer IC 7000
provide Vertical sync to the through the I2C bus. The
Microcomputer to synchronize the Microcomputer will then shut the
On-Screen Display and Closed set Off.
Caption.
G7 CHASSIS POWER SUPPLY BLOCK
The Stereo decoder IC 7430 (Figure 2)
performs audio selection and Sound
processing in the G7 chassis. When the 120Vac source is connect-
SEL_Video is fed to 7430 which has ed to the G7 chassis, approximate-
built in Sound IF and decoding ly 160Vdc is developed by the
circuits. IC 7430 selects between bridge rectifier circuit. The 160
internally decoded audio or from volts dc goes through transformer
AUD_1, AUD_2, or FRT. Left and 5912 to the Switch Regulator
Right monitor audio is output on Driver IC 3917. The Start voltage
Pins 34 and 33. This signal is for the switching mode power
fed to the Rear Jack panel. Main supply is taken from the neutral
Audio is output on Pins 28 and 29 leg of the input ac.
and fed to the Audio amplifier
7550 before being applied to the The power supply includes a single
speakers. Headphone audio is integrated circuit, operating as a
output on pins 25 and 26 and is free-running switching mode power
amplified by 7553 before being supply. There is no separate
applied to the Headphone jack. power supply for standby. The
page 5
FIGURE 2 - POWER SUPPLY BLOCK
power supply turns On when ac is This drives the Opto-isolator
applied to the set. The switching 7950, which provides feedback to
regulator IC 7902 starts switching IC 7902. The feedback controls
when the initial voltage is the On time of the switch inside
applied through the Start circuit. IC 7902.
The switch inside IC 7902 turns On
and Off to allow current to flow The voltages needed to operate the
through the primary of the television are developed from the
transformer 5912. Energy stored secondaries of transformer 5912.
in the primary during the On-time When the set is turned On, the Low
is delivered to the secondaries on the Standby (STBY) line turns
during the Off-time. Positive Off transistor 7909 to switch the
voltage from the hot secondary on 8 volt regulator switch IC 7908 On
Pin 8 is rectified to provide to provide the +8 volt supply to
operating voltage for the the set. The regulator switch IC
switching regulator. The 7907 provides Reset to the
secondary 130 volt supply is the Microcomputer, a +5 volt standby,
reference voltage for the supply. and a switched +5 volt supply when
This voltage is sampled by the the scan derived +13 volts is
Voltage Control Feedback IC 7904. applied to the IC.
page 6
FIGURE 3 - G7 POWER SUPPLY page 7
G7 SWITCH MODE POWER SUPPLY standby voltage when power is
(Figure 3) applied to the set. When the set
is turned On, the On/Standby line
Startup voltage for 7902 is taken goes Low turning transistor 7909
from the neutral side of the ac Off, turning 7908 On to produce
line and fed to Pin 4 through the 8 volt source. The Low will
resistor 3917. When Capacitor also turn 7955 Off. The 5V_STBY
2912 charges to 14.5 volts, the voltage is then applied to Pin 3
oscillator inside 7902 turns On of 7907 through resistors 3951 and
switching the FET inside the IC 3980. The 5 volt regulator inside
On. Voltage from Pin 8 of 7907 will then be switched On to
transformer 5912 is rectified by output the 5 volt source on Pin 6.
6908 to develop the operating
voltage for the IC. The 130 volt G7 HORIZONTAL OUTPUT BLOCK
supply is the reference supply for (Figure 4)
the IC. The 130 volt supply drives
the feedback IC 7904 which drives The +8 volt source turns the
the feedback optoisolator 7950. Horizontal Oscillator section
This causes changes in the inside 7150 On to produce horizon-
reference voltage on Pin 1 of 7902 tal drive on Pin 40. Vertical
to regulate the 130 volt supply. drive on Pin 47 drives the
Vertical output IC 7700. The
The Power supply produces a 130 output of the Vertical Output IC
volt, 33 volt, 14 volt, and 5 volt on Pin 3 drives is buffered by
FIGURE 4 - HORIZONTAL AND VERTICAL BLOCK
page 8
transistor 7715. This signal is Voltage, 200 volts, and G1 Voltage
fed to the Microprocessor to syn- to drive the CRT. A +13 volt and
chronize the On Screen Display. a -13 volt supply is developed to
Vertical drive also keeps drive the Vertical output circuit.
transistor 7716 turned On to keep The DAG voltage from Pin 10 of the
the PROT_E_W_VERT line low. If IFT is fed to the signal processor
Vertical drive is lost, this turns to make changes in the Picture
transistor 7716 Off, causing the level. This maintains the CRT at
PROT_E_W_VERT line to go High a constant brightness level to
which will turn the set Off. compensate for changes in Beam
Current. Transistor 7629 monitors
G7 HORIZONTAL OUTPUT CIRCUIT the DAG voltage to shut the set
(Figure 5) down in the case of excessive Beam
Current. Excessive Beam current
Horizontal drive is fed to would cause the DAG voltage to
transistor 7610 which drives the become negative turning 7629 On.
Horizontal Output transistor 7620. This would cause the High Beam
The Horizontal output circuit Protect line to go High.
produces High Voltage, Focus
NOTES:
page 9
FIGURE 5 - HORIZONTAL OUTPUT CIRCUIT page 10
G7 EAST - WEST CORRECTION CIRCUIT On through resistor 3658. If the
(Figure 6) Horizontal Output circuit should
fail, a dc voltage will develop on
East West Drive is fed to the gate the source of 7680. This will
of 7680 on the East-West turn transistor 7658 On, turning
correction panel to perform transistor 7659 Off. The
linearity correction. The negative PROT_E_W-VERT line will then go
horizontal pulses on the source High, which will shut the
leg of 7680 keeps transistor 7658 Horizontal drive Off.
turned Off. Transistor 7659 turns
FIGURE 6 - EAST WEST CORRECTION CIRCUIT
detected by the Microprocessor
G7 MICROPROCESSOR CIRCUIT (Figure during the operation of the set.
7) This is useful to the service
technician to determine what
The Microprocessor communicates circuit areas an intermittent
with the set via the control lines problem may have occurred. To
and the SDA and SCL lines. enter the Service Default Mode,
Vertical and Horizontal sync is enter 0-6-2-5-9-6-Menu on the
fed to the IC on Pins 37 and 36. remote control. To display the
A High on the PROT_W_W_VERT line Error Codes, press the Status
will cause transistor 7041 to turn button on the remote. The Error
On. This will cause Pin 11 of Codes will be hidden if the Status
the IC to go Low turning the set button is pressed again. Up to
Off. six Error Codes will be displayed.
The List of Error Codes is shown
Service Default Mode (SDM) on page 18 of the service manual.
Some of them are listed below:
The Service Default Mode is used 0 =No Error
to display Errors that have been 1 =X-ray protection, E/W
page 11
FIGURE 7 - MICROPROCESSOR CIRCUIT page 12
protection, and/or Vertical been On in hexadecimal format.
protection active The next set of characters
2 =High beam current protection (A80US1-2.1) displays the software
active identification, country, and
3 =Reserved software version. The characters
4 =+5V protection active in the upper right hand corner of
5 =Signal Processor (IC 7150) the screen "SAM" shows that the
register corrupted set is in the Service Alignment
Mode. The next line displays any
To perform customer adjustments errors which may have occurred in
while in this mode, press the Menu the set. The "SDM" mode is used
button. The text "SDM" will to erase the error codes. The
continue to be displayed in the next line displays the OPT codes
upper right hand corner of the which are the Feature Bits for the
screen while adjustments are made. chassis version being used. The
To exit the Service Default Mode Feature Bits are changed in the
and erase the Error Codes, turn Options selection of the menu.
the unit Off using the power There are four selections in this
button on the remote control. menu which are Reload Default,
Erase Buffer, Options, and
Customer Service Mode Alignments. Use the cursor up and
down buttons on the remote to
The Customer Service Mode (CSM) highlight the selection. Use the
allows the customer to retrieve cursor right button to select the
Error Data from a set that has a highlighted selection. Pressing
working display. The customer is the Menu button on the Remote will
instructed by phone to enter CSM allow customer settings to be
and read off the display that made. The "SAM" will continue to
appears. During this mode, be displayed in the upper right
Parental lockout mode is defeated. hand corner of the screen. Press
To enter the Customer Service the Menu button again to return to
Mode, press and hold the Mute the alignment menu.
button on the remote and the
Channel Up button on the set for The "OPTIONS" selection in the
four seconds. To exit this mode, menu will allow changes to be made
press the power button on the in the Option Bits or Bytes. Refer
Remote or the front of the set. to the service manual for correct
Options of the chassis being
Service Alignment Mode (SAM) serviced.
Service alignments are performed The Alignment selection in the
in the Service Alignment Mode. To Menu has a sub menu with four
enter the Service Alignment Mode, selections. They are GEOMETRY,
press 0-6-2-5-9-6-Status on the WHITE TONE, TUNER, and BTSC SND.
Remote Control. The first set of White Tone settings are used to
characters (00E6 for example) is a set the white balance and CRT
Run Timer. The Run Timer displays drives. The Tuner settings are
the number of hours the set has used to set the AFT and AGC.
page 13
The Geometry selection in the menu To save the changes, turn the set
has eleven selections in its sub Off using the power button on the
menu. Use the cursor up-down keys Remote Control. To ensure that
on the Remote to highlight the the new settings will be read by
desired selection. Use the cursor the Microcomputer, remove ac power
right-left keys to change the from the set for a few seconds.
value of the selection.
NOTES:
page 14
DOES THE SET IS A PICTURE
DOES THE SET IS COLOR IS AUDIO
START TURN ON
YES SHUT DOWN NO PRESENT
YES PRESENT
YES PRESENT
AFTER TURN ON
NO
A YES B NO YOUR PROBLEM IS
IC 7150 OR XTAL 1190 NO BEYOND THE SCOPE OF
THIS FLOWCHART YES
TRY CALLING FOR NO
TECHNICAL ASSISTANCE
IS 130 VOLTS
DOES THE BASE OF 7909 IC7000 AND RELATED
PRESENT ON 6913 YES GO LOW WHEN THE NO COMPONENTS
REPLACE 7150
CATHODE
POWER BUTTON IS
G7 PRESSED
INSERT AUX AUDIO INTO THE
TROUBLESHOOTING JACK PANEL AND SELECT THE
FLOW CHART CORRECT INPUT IN THE MENU
NO NO
YES
MEASURE THE
RESISTANCE OF THE DOES PIN 2 OF IS HORIZONTAL IS HORIZ DRIVE TRANSISTOR 7610 OR
130 VOLT LINE TO 7908 GO TO 8V YES DRIVE PRESENT ON YES PRESENT ON THE NO TRANSFORMER 5611
GROUND PIN 40 OF 7150 BASE OF 7620
IS AUDIO
NO YES IC 7430 NO PRESENT AT THE
SPEAKERS
IS HORIZ DRIVE
CHECK FOR SHORTED IS THE IS PIN 1 OF 7904 >
7620
NO RESISTANCE >4K 10V
NO REPLACE 7909 PRESENT ON THE NO TRANSISTOR 7620
COLLECTOR OF 7620
YES
YES
YES YES
IS AUDIO
SET IS TURNING ON
CHECK FUSE 1900 IS APPROX 140-160 TRY ANOTHER
IC 7430 NO PRESENT ON PINS
AND BRIDGE 6903
NO VOLTS PRESENT ON REPLACE 7908 IC 7550 28&29 OF 7430
SYMPTOM
PIN 3 OF 7902
YES
YES
IS 15 VOLTS IS AUDIO
DIODE 6918 IN THE IS PIN 11 OF 7550
POWER SUPPLY
NO PRESENT ON PIN 3 HIGH HIGH (14V) OR
NO PRESENT ON PINS YES
CHECK DIODE 6908 IS THE DRIVE ON PIN 3 OF 7550 4,6,9, AND 7 OF
AND RESISTOR 3959
YES OF 7902 PULSING ON LOW (0.7V)
7550
AND OFF
LOW YES
NO
page 15
CHECK TRANSISTORS CHECK SPEAKERS
CHECK RESISTOR 7552 AND 7551 OR MICRO
3917 AND BRIDGE NO IS PIN 4 OF 7902 > YES REPLACE 7902 7000
6903 16 VOLTS
CHECK THE DC
DOES THE SCREEN CHECK I2C BUS ON
VOLTAGE ON PIN 50 DOES PIN 11 OF 7000 GO
A GO BRIGHT BEFORE
THE SET SHUTS
NO OF 7150 WHILE
IS THE VOLTAGE >
3.9 VOLTS
NO LOW AFTER THE POWER NO PINS 49 AND 50 OF
7000
TURNING THE SET ON BUTTON HAS BEEN
DOWN
RELEASED
CHECK 200 VOLT TRANSISTOR 7629,
SOURCE DIODE 3628, IFT, AND
YES RESISTOR 3643 AND YES RELATED YES
DIODE 6641 COMPONENTS
IS VERTICAL DRIVE IS THE VOLTAGE ON THE
IS VERTICAL DRIVE IS HORIZ DRIVE
PRESENT ON PIN 3 OF NO PRESENT ON PIN 37 OF YES PRESENT ON PIN NO CATHODE OF 6627 > 45
7700 VOLTS WHEN THE SET IS
7000 36 OF 7000
TURNED ON
YES NO
YES
CHECK PLUS AND IC 7150 REPLACE 7150
EW CORRECTION IFT, TUNING
NO MINUS 13 VOLT TRANSISTOR 7610 OR
CIRCUIT CAPACITORS
SUPPLIES 7620
7700 VERTICAL OUT
7150 SIG PROC
TRANSISTORS 7161
OR 7170
IS VIDEO PRESENT YES
TRANSISTORS 7715 FILTER 1168 NO ON PIN 13 OF 7150
YES PIP MODULE IF 2
AND 7075
TUNER VERSION
YES
INSERT A COMPOSITE
VIDEO SIGNAL INTO
IS OSD (ON WITH THE TUNER
THE REAR JACK IS THE PICTURE
B SCREEN DISPLAY)
PRESENT
YES PANEL AND SELECT PRESENT YES SELECTED, IS VIDEO
PRESENT ON PIN 6
NO D
THAT INPUT IN THE
OF 7150
MENU
NO
CHECK CRT BOARD NO
IS > 2V p-p DRIVE
YES PRESENT ON PINS NO REPLACE 7150 C
page 16
19,20, AND 21 ON 7150
IS 33 VOLTS IS 5 VOLTS IS 5 VOLTS CHECK 7955 AND
D PRESENT ON PIN
12 OF THE TUNER
YES PRESENT ON PIN 6
OF THE TUNER
NO PRESENT ON PIN 3
OF 7907
NO RELATED
COMPONENTS
YES
NO YES
CHECK RESISTOR
SUB IF ON PIN 1 OF REPLACE 7907
3994 AND DIODE 6955
1145, SAW FILTER
REPLACE SAW FILTER
1145
YES
DOES VIDEO DOES VIDEO COMB FILTER
SUB IF ON PIN 49 OF
REPLACE TUNER YES APPEAR ON THE NO 7150
APPEAR ON THE
SCREEN SCREEN
NO
NO
IS Y-C PRESENT
REPLACE 7150
ON PINS 11 AND 10
OF 7150
IS VIDEO PRESENT ON THE IF Y-C PRESENT
C VIDEO_MON INPUT ON THE YES GOING TO THE PIP
COMB FILTER MODULE
YES
YES
YES
IS Y-C PRESENT
IC 7150 COMMING FROM THE
NO NO PIP MODULE
IS Y,R-Y, B-Y PRESENT
IS VIDEO PRESENT NO IF PIN 33 OF 7150 NO ON PINS 28,29, AND30
TRANSISTOR 7176 YES ON PIN 38 OF 7150 APPROX 3 VOLTS OF 7150
DC
PIP MODULE
YES
NO COMB FILTER YES
NO NO
IC 7150 YES YUV PANEL
JUMPERS FOR NON
YUV SETS
page 17
IS VIDEO PRESET
ON PIN 17 OF 7150 IFY,R-Y,B-Y
PRESENT ON PINS IC 7150
27, 31, AND 32 OF
REAR JACK PANEL
IC 7150 YES 7150
NO
Dear Servicers,
Welcome to the New Internet version of Service Reporter
and Technical Training Manual.
Philips Technical Training is proud to reinstate this
valuable form of update training in a more timely format.
This first issue is a test to determine the value of this
information to you as a servicer.
Please review the material presented in both the Service
Reporter and Technical Training Manual.
Please also answer the accompanying survey form and
either fax or mail it to:
Philips Technical Training
PO Box 555
Jefferson City, TN 37760
Fax # 865-475-0221
or send us your comments by e-mail at:
[email protected]
Sincerely,
Philips Technical Training Department
Service Reporter Survey
Please answer the following questions by selecting a rating of 1 through 5 (1 being the lowest
grade and 5 being the highest.)
1. Rate the Service Reporter article's ability to increase your knowledge of the circuit
discussed?
1 2 3 4 5
2. How do you rate the need to ask further questions on this circuit?
1 2 3 4 5
3. Rate your ease of accessibility to articles accessible 24/7 via the Internet as is this one?
1 2 3 4 5
4. Rate how much you would like to suggest subjects for the Service Reporter on which you
need additional information?
1 2 3 4 5
5. Rate how much you like the Internet as a medium for easily accessible service information?
1 2 3 4 5
6. How do you rate the ability to access this information and print it out for your use, as you
need it?
1 2 3 4 5
7. Rate the Training Manual's ability to increase your knowledge of the circuit discussed?
1 2 3 4 5
Thank you for your interest in and assistance to Philips Technical
Training.
Please mail or fax to: Philips Technical Training
PO Box 555
Jefferson City, TN 37760
Fax # 865-475-0221