Related Manuals for Magnum PF21GB300
Summary of Contents for Magnum PF21GB300
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Page 1: Service Manual
C O L O R T E L E V I S I O N SERVICE MANUAL MODELNO: PF21GB300 PF21500 PF21516S CHASSIS NO. ETE-3 Please read this manual carefully before service. -
Page 2: Safety Precaution
SAFETY INSTRUCTIONS AND MAINTENANCE WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAUTION”AND “PRODUCT SAFETY NOTICE”INSTRUCTION BELOW. 1.1 X-RAY RADIATION PRECAUTION 1.1.1 The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit X-ray radiation as result of excessive EHT voltage. -
Page 3: Safety Symbol Description
CAUTION: FOR YOUR PROTECTION, THE FOLLOWING PRODUCT SAFETY NOTICE SHOULD BE READ CAREFULLY BEFORE OPERATING AND SERVICING THIS TV SET. 1.3.1 Many electrical and mechanical components in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the X-ray radiation protection afforded by them cannot necessarily be obtained by using replacements rated at higher voltages or wattage, etc. -
Page 4: Set-Up Adjustments
the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol cleaners. ADJUSTMENTS 2.1 SET-UP ADJUSTMENTS The following adjustments should be made when a complete realignment is required or a new picture tube is installed. Perform the adjustments in the following order: Color purity Convergence... - Page 5 2.1.2 Convergence Adjustment Preparation: Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes. •Center convergence adjustment. •Receive dot pattern. •Adjust the brightness/contrast controls to obtain a sharp picture. •Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue vertical lines are superimposed each other on the center of the screen.
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Page 6: Circuit Adjustments
2.1.3 White Balance Adjustment Generally, white balance adjustment is made with professional equipment. It’s not practical to get good white balance only through manual adjustment. For TVs with I2C bus control, change the bus data to adjust white balance. 2.2 CIRCUIT ADJUSTMENTS Preparation: Circuit adjustments should be made only after completion of set-up adjustments. - Page 7 •Power on the specific degausser and face it to the TV screen. •Turn on the degausser. Slowly move it around the screen and slowly take it away from the TV. •Repeat the above steps until the TV is degaussed completely. 2.2.2 Confirmation and Adjustment for Voltage Caution: +B voltage has close relation to high voltage.
- Page 8 Test Point Voltage Test Point Voltage Negative of VD49 1 184±3V 14"GS_CRT_anode 22±1.5KV 21 "FS_CRT_anode 25.5±1.5KV 21 "PF-CRT-anode 26.5±1.5KV 21”US CRT anode 21”US CRT anode 25.5±1.5KV 23.5±1.5KV (HUAFEI) (SAMSUNG/LG) Heater 6.3±0.3Vrms . Lian grid, focuse of the adjustment and white balance adjust 2.2.4 Caution: Dangerously high voltages are present inside the TV.
- Page 9 HBOW Horizental BOW Correction 32/32 VLIN Vertical Linearity 32/32 VSCR Vertical Scroll 32/32 E-W Width 53/51 E-W Parabola Width 22/18 Page 3 E-W Upper Corner Parabola 46/37 E-W Bottom Corner Parabola 42/33 E-W Trapezium 32/32 Vertical Shift 36/36 Vertical Amplitude 22/22 Vertical S Correction 32/24...
- Page 10 Cut-off control range DCXO Crystal Frequency Correcting Compensation Page 8 OTHER S-VIDEO S-VIDEO Set M-ON Memory on OFF-TIM Auot off without signal. 0:5 Minutes; 1:10 Minutes; 2: 15Minutes LOGO-A User’s logo setup NO-SIG Have no signal to hint LOG0 Logo color 0 LOG1 Logo color 1 Page 9...
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Page 11: Chassis Description
3.1 STRUCTUE BLOCK DIAGRAM Video Amplifier H.OUT UOC-TOP TUNER V.OUT Power Supply Audio Circuit Amplifier 3.2 CHASSIS DESCRIPTION 3.2.1 General Description ETE-3 chassis is applied in SS21GG300A seriers . By use of Philips UOC-TOP for TV small signal processing and bus control, the chassis enables TV tuning, adjustment, control and picture correction, featuring high-integration, high-performance-to-price ratio and high-reliability and compact circuit with fewer external components. -
Page 12: General Description
3.2.3 The chassis mainly uses the following ICs and assemblies. P o s itio n T yp e D e s c r ip tio n N 2 0 1 A T 2 4 C1 6 E E RP O M N 2 0 2 T D A 1 1 1 X X P S Mic r o p r o c e s s o r , MO N O - 9 0... - Page 13 ·Only one reference (12 MHz) crystal required for the -Controller, Teletext- and the colour decoder ·Multi-standard colour decoder with automatic search system ·Internal base-band delay line ·Indication of the Signal-to-Noise ratio of the incoming CVBS signal ·A linear RGB/YUV/YPBPR input with fast blanking for external RGB/YUV sources. The synchronisation circuit can be connected to the incoming Y signal.
- Page 14 Data Capture ·Text memory for 1 page ·Inventory of transmitted Teletext pages stored in the Transmitted Page Table (TPT) and Subtitle Page Table (SPT) ·Data Capture for US Closed Caption ·Data Capture for 525/625 line WST, VPS (PDC system A) and 625 line Wide Screen Signalling (WSS) bit decoding ·Automatic selection between 525 WST/625 WST ·Automatic selection between 625 WST/VPS on line 16 of VBI...
- Page 15 4.2.2 Features 2 Channel SE: 1 W to 7.5 W operation possibility Soft clipping Input clamps Volume control Standby and mute mode No on/off switching plops Low standby current High supply voltage ripple rejection Outputs short-circuit protected to ground, supply and across the load Thermally protected Pin compatible with the TFA9843AJ, TFA9843(B)J, TFA9842(B)J, TFA9841J.
- Page 16 4.2.3 Pin Description Symbol Description input 2 OUT2 loudspeaker terminal 2 common input voltage decoupling input 1 ground half supply voltage decoupling (ripple rejection) volume control input (standby, mute and volume control) OUT1 loudspeaker terminal 1 supply voltage Description Symbol 4.3 VERTICAL SCAN OUTPUT STAGE CIRCUIT TDA4864AJ 4.3.1 FEATURES...
- Page 17 SYMBOL DESCRIPTION positive supply voltage 1 flyback generator output supply voltage 2 for vertical output ground or negative supply voltage V-OUT vertical output inverted input of differential input stage non-inverted input of differential input stage 4.4 EEPROM AT24C16 4.4.1 Features Data EEPROM internally organized as 1024/2048 bytes and 64/128 pages×16 bytes Page protection mode, flexible page-by-page hardware write protection -Additional protection EEPROM of 64/128 bits, bit per data page 1-Protection setting for each data page by writing its protection bit -Protection...
- Page 18 − Typical programming time 6ms(< 1 0ms) for up to 16 bytes High reliability − Endurance 106 cycles 1) − Data retention 40 years 1) − ESD protection 4000 V on all pins 8 pin DIP/DSO packages Available for extended temperature ranges −...
- Page 19 4.5 SWITCH-MODE POWER SUPPLY IC FSCQ0765RT Internal Block Diagram Pin Number Pin Name Pin Function Description Drain High voltage power SenseFET drain connection. This pin is the control ground and the SenseFET source. This pin is the positive supply input. This pin provides internal operating current for both start-up and steady-state operation.
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