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PHILIPS SERVICE SOLUTIONS GROUP
TECHNICAL TRAINING
2001 RTM TRAINING
philips technical training
P H I L I P S
401 e. old andrew johnson hwy
TECH
p.o. box 555
jefferson city, tn
phone: 423-475-0397
VIDEOTAP E S
fax:423-475-0221
M A N U A L S
email: Technical.Training@philips.com
PSSG
H8 CHASSIS
MANUAL
37760
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Summary of Contents for Philips H8
- Page 1 PSSG PHILIPS SERVICE SOLUTIONS GROUP H8 CHASSIS TECHNICAL TRAINING MANUAL 2001 RTM TRAINING philips technical training P H I L I P S 401 e. old andrew johnson hwy TECH p.o. box 555 jefferson city, tn 37760 phone: 423-475-0397 VIDEOTAP E S...
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Page 2: Table Of Contents
TABLE OF CONTENTS AUDIO OUTPUT AUDIO SIGNAL PROCESSOR BOARD LOCATIONS CUSTOMER CONTROL INTERFACE DOUBLE WINDOW DOUBLE WINDOW VIDEO SIGNAL FLOW HEADPHONE AMPLIFIER HORIZONTAL AND VERTICAL DRIVE HORIZONTAL OUTPUT AND SHUTDOWN INTRODUCTION MICROPROCESSOR M-LINK NON PIP VIDEO SIGNAL FLOW POWER DOWN AND FRONT DETECT PIP CIRCUIT PIP VIDEO SIGNAL FLOW SERVICE MODES... -
Page 3: Introduction
INTRODUCTION with the M-Link feature. The M-Link feature allows VCRs, DVD, etc to be The H8 TV Chassis is designed for the 2000- controlled through the TV. Up to five 2001 model years. It comes in three screen devices can be controlled. Refer to the sizes which are 27, 32, and 36 inch. -
Page 4: Board Locations
H8 CHASSIS BOARD LOCATIONS NON PIP CHASSIS VIEW TV BLOCKING OPTIONS Page 2... -
Page 5: Switch Mode Power Supply
POWER SUPPLY (135 volt source). This source is sampled by 7971 which drives the feedback Switch Mode Supply (Figure 1) opto-isolator 7929 to set the switch time of comparator B. This controls the On time of The Power Supply is a Switching type supply. the internal switching FET to maintain the The Power Supply begins operating as soon VBAT voltage at the correct level. - Page 6 Set Turned On. Set in Standby.
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Page 7: Standby Regulators And On/Off
Standby Regulators and On/Off (Figure 2) drive for the 3.3 volt regulator. The 8 volt unregulated supply is applied to 7942, The voltage from jumper 9964 (approximately which is a switched 8 volt regulator. The 8 volts) is used to produce the 3.3 volt Standby line goes Low when the set is standby, 5 volt standby, 5 volt remote control, turned On, turning transistor 7944 Off,... -
Page 8: Power Down And Front Detect
Figure 3 - 5 Volt Switch lines, blanking the CRT. Transistor 7277 Power Down and Front Detect (Figure 4) will continue to conduct until Capacitor 2284 has discharged. In the same manner, The Power-Down and Front Detect circuits 7990 will be turned Off, turning 7991 Off, signal the Microprocessor in case power is which will turn 7992 On, causing the Front- removed from the set. -
Page 9: Horizontal And Vertical Drive
SWEEP AND SHUTDOWN CIRCUITS One function is to provide Horizontal Phase correction for the Horizontal Drive. The other is to provide Flash protection in Horizontal and Vertical Drive (Figure 5) case of an overvoltage on the I-Beam line. If the pulse on Pin 58 exceeds 6 volts, The 3.3 volts Standby supply provides power Horizontal Drive will be shut Off. -
Page 10: Non Pip Video Signal Flow
There are four variations in the signal flow SAW filter, 1451, and then to the Signal path for the H8 chassis. They are the Non- Processor, 7301, on Pins 1 and 2. PIP, the Single Tuner PIP, the Dual Tuner PIP, and the Double Window version. -
Page 14: Standard Crt Drive
the MAIN-CVBS-EXT-IN. The MAIN-CVBS- Display) is added. The signal is then fed EXT-IN is selected composite Video or to the RGB output circuit and to the CRT. Luminance from either AV1, AV2, or AV3. A Test Waveform is first sent to the CRT These signals are selected by the Switch IC on the RGB lines. -
Page 17: Pip Circuit
PIP (Picture in Picture) Video Flow (Figure circuits on the PIP panel. There are two PIP chassis versions which are PIP Circuit (Figure 11) the Single Tuner and Two Tuner sets. Video Signal flow for the Single Tuner PIP version is The PIP comes in two versions, Single the same as the Two Tuner version, except Tuner with no tuner on the PIP panel and... - Page 18 the SSB panel on connector 0205. The control the tuner aux switching IC 7801. combined YUV signal is output on Pins 12, 11, and 10 to the SSB. PIP Power Supply (Figure 13) PIP Switching (Figure 12) The PIP panel is powered by +5 volt, +8 volt, and +33 volt supplies from the Large Control for the PIP panel is performed by Signal Board (LSB).
- Page 19 Figure 12 - Single Window PIP Control Figure 13 - PIP Power Supply Page 17...
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Page 21: Double Window
(Figure 14) on Pins 24, 29, and 20. If Composite Video is selected, it is fed to a YC The XXPT91 versions of the H8 chassis have separator, then to a Delay Line and the DOUBLE WINDOW panels. This allows Demodulator. -
Page 24: Very Flat Crt Drive
Figure 17 - PIP/Double Window Control and Power Supply Very Flat CRT Drive Circuit (Figure 18) The CRT panel for the Very Flat CRT's has an SVM circuit to sharpen the transitions from dark to light and light to dark. The RGB signals are combined and fed to 7860 which performs impedance matching. -
Page 26: Audio Output
AUDIO SIGNAL PATH Right Channels. The Amplifier is powered by a 27 volt supply which is present as Audio Signal Processing (Figure 19) soon as power is applied to the set. When the set is in the Stand By mode, a High on All Audio Processing is performed by 7651, the Stand By line turns transistors 7710 which is located on the SSB. - Page 29 Figure 21 - Headphone Amplifier H8 Side Jack panel Page 27...
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Page 30: Customer Control Interface
Figure 22 - Side Jack Panel Side Jack Panel (Figure 22) resistor 3295 is taken out of the circuit causing the voltage to increase to 1.35 The Side Jack panel is the AV3 input in the volts. The Microprocessor will activate the Customer Menu. -
Page 31: Microprocessor
Microprocessor (Figure 23) Reset. When the set is operating normally, the Reset pin should measure Low. The The Microprocessor, 7064, is located on the FRONT-DETECT line monitors the Side SSB. User control of the Microprocessor is Jack panel for the Headphone or an SVHS accomplished via the Keyboard or Remote. - Page 33 Figure 24 - Customer Control Interface Page 31...
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Page 35: Service Modes
SERVICE MODES repeat itself for the next Error Code. When all of the Error Codes have been displayed, All of the adjustments in the set are performed the LED will light for three seconds. The via the On-Screen Service mode. There are procedure will then repeat itself. -
Page 36: M-Link
Figure 26 - M-Link driver circuit M-link (Figure 26) The M-Link feature is on all sets above models XXPT41 and above. This feature allows external devices such as DVD players and VCRs to be controlled by the TV set. The M- Link panel has a driver circuit which is connected to the I2C buss to drive the IR... -
Page 37: Troubleshooting Flow Charts
DEAD SET/ IS 135 VOLTS (VBAT) DOES A VOLTAGE APPEAR DOES APPROX 14 VOLTS CHECK FUSE 1941 AND PRESENT ON THE CATHODE MOMENTARILY ON THE CATHODE APPEAR MOMENTARILY RELATED SHUTDOWN OF DIODE 6938? OF 6938 WHEN POWER IS ON THE CATHODE OF COMPONENTS. - Page 38 DOES THE BASE OF 7440 GO DOES THE PROT-UP LINE GO DOES THE COLLECTOR OF LOWER THAN THE EMITTER CHECK 7408 . HIGH WHEN THE SET IS 7408 GO TO 135 VOLTS WHEN WHEN THE SET IS TURNED ON? TURNED ON? LOW IS 0 THE SET IS TURNED ON? VOLTS.
- Page 39 SELECT AUX 1 IN THE SELECT THE TUNER IS OSD (ON IS A PICTURE IS A PICTURE IS APPROX 33 MENU AND INSERT A INPUT AND SUB AN IF NO PICTURE SCREEN DISPLAY) PRESENT ON THE PRESENT ON VOLTS PRESENT SIGNAL INTO THAT SIGNAL ON PIN 68 OF PRESENT?
- Page 40 IT IS ASSUMED THAT A PICTURE IS PRESENT. IF THE PICTURE IS BLANKED FOR SOME REASON, THE IS 27 VOLTS DC IS AUDIO PRESENT ON IS PIN 3 OF 7702 31 NO AUDIO AUDIO WILL BE MUTED. IF THE PRESENT ON PIN 10 PINS 5 AND 6 OF 0226? VOLTS WITH THE SET TURNS ON, WITHOUT A...
- Page 41 VISIT PHILIPS TRAINING FORCEONLINE.COM OR EMAIL US AT TECHNICAL.TRAINING.COM SEE THE FRONT COVER FOR OUR MAILING ADDRESS AND PHONE NUMBER. SECOND ISSUE 3/2001...