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Changhong Electric PF29GA18A, Руководство по обслуживанию, Страница: 22 / 33

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*The LA42102 uses a zero bias type input circuit, and the input pin potential is about zero volts.(0.01V) 
Determine the polarity orientation of these capacitors based on the DC current from the circuit 
Connected to the LA42102 front end.   

 

 

 

Block Diagram

Equivalent Circuit

4

8

9

10

11

2

12

Output amplifier

Output amplifier

Input amplifier

Input amplifier

  Vcc / ground shorting protection circuit
  Load shorting protection circuit
  Thermal protection circuit

IN1

IN2

+ OUT2

- OUT1

PWR
GND

- OUT2

+ OUT1

Ri=

30k

Ω

Ri=

30k

Ω

1

Ripple

Filter

7

V

CC

5

Standby

3

PRE

GND

6

MUTE

Ripple

Filter

+OUT2

V

CC

-OUT1

PWR

GND

STBY

IN1

IN2

PRE

GND

-OUT2

+OUT1

MUTE

C3

47uF

/25V

N.C.

1

2

3

4

5

6

7

8

9

10

11

12

13

C4

10uF

/10V

R1

15k

Ω

LA42102

+ 5V

C8

0.1uF

R4

2.2

Ω

C9

0.1uF

R5

2.2

Ω

C7

0.1uF

R3

2.2

Ω

C6

0.1uF

R2

2.2

Ω

C5

1000uF

/25V

C1

4.7uF

/10V

C2

4.7uF

/10V

*

*

RL

RL

Содержание PF29GA18A

Страница 1: ...COLOR TELEVISION SERVICE MANUAL MODEL NO CHASSIS NO ETA 1D Please read this manual carefully before service PF29GA18A...

Страница 2: ...CT SAFETY NOTICE 2 SAFETY SYMBOL DESCRIPTION 3 MAINTENANCE 3 ADJUSTMENTS 4 SET UP ADJUSTMENTS 4 CIRCUIT ADJUSTMENTS 7 STRUCTURE AND CHASSIS FUNCTION DESCRIPTION 13 STRUCTURE BLOCK DIAGRAM 13 CHASSIS D...

Страница 3: ...ICE below 4 Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT anode So ensure that the maximum EHT voltage does not exceed the rated value after service and...

Страница 4: ...se 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 o...

Страница 5: ...ts identified by the VDE marking have special safety related characteristics MAINTENANCE 1 Place the TV set on a stable stand or base that is of adequate size and strength to prevent it from being acc...

Страница 6: ...t 1 3 Operate the TV for at least 15 minutes 1 4 Degauss the TV set using a specific degaussing coil 1 5 Set the brightness and contrast to maximum 1 6 Counter clockwise rotate the R B low brightness...

Страница 7: ...Adjust two tabs of the 6 pole magnet to superimpose red blue line and green line 2 1 6 Remember red and blue movement Repeat steps 2 1 3 2 1 5 until optimal convergence is obtained 2 2 Circumference...

Страница 8: ...en the lamp screw holding the deflection yoke assembly Fig 2 4 pole Magnet Movement 6 pole Magnet Movement Center Convergence by Convergence Magnets Incline the Yoke Up or Down Incline the Yoke Right...

Страница 9: ...bove steps until the TV is degaussed completely 2 Confirmation and Adjustment for Voltage Caution B voltage has close relation to high voltage To prevent X ray radiation set B voltage to the rated val...

Страница 10: ...g the back cover look for the FBT on the main PCB There should be a FCB on the FBT 4 2 Power on the TV and preheat it for 15 min 4 3 Receive a normal TV signal Rotate knob of the FCB until you get a s...

Страница 11: ...us data GDET0104 03 Table 3 Function Description for Bus Data Symbol Description Data OSD OSD Horizontal Position 63 OPT Optional Setting B7 RCUT R CUT OFF OPT GCUT G CUT OFF OPT BCUT B CUT OFF OPT GD...

Страница 12: ...HITS Hight 60Hz difference from HIT OPT VLIN V Linearity 50Hz OPT PAGE6 VLIS V Linearity 60Hz difference from VLIN OPT VSC VS Correction 50Hz OPT VSS VS Correction 60Hz OPT HBOW OPT HPARA OPT UBLACK 0...

Страница 13: ...AUSTP 04 PAGE12 BBCT 06 STBG S TRAP B G 06 STI S TRAP I 08 STDK S TRAP D K 08 STM S TRAP M 05 SSBG S TRAP HP LP B G 08 SSI S TRAP HP LP I 08 SSDK S TRAP HP LP D K 08 PAGE13 SSM S TRAP HP LP M 10 SYNC...

Страница 14: ...T DPC OPT DPCS OPT KEY OPT KEYS OPT ECCT OPT PAGE19 ECCB OPT HEHT 04 DPC69 OPT HIT69 OPT TREC 30 TREX 60 VEHT 00 SBY 08 PAGE20 SRY 08 SECD 10 SEC29 00 BASC 40 BASX 70 MODE3 01 BALC 40 FVOL 13 PAGE21 N...

Страница 15: ...UCTURE AND CHISSIS FUNCTION DESCRIPTION 1 STRUCTUE BLOCK DIAGRAM 13 Audio Amplifier TMP8897 Video Amplifier H OUT V OUT Power Supply Circuit TUNER AVIN AVIN AVOUT IR KEY Structure Block Diagram for ET...

Страница 16: ...AT24C16 for data memory LA78041 for vertical output power amplifying LA42102 for audio power amplifying TA1343N for audio processor FSCQ1265RTYDTU for power circuit adjustment and control The followi...

Страница 17: ...a 64 pin shrink DIP package The MCU contains 8 bit CPU ROM RAM I O ports timer counters A D converters an on screen display controller remote control interfaces IIC bus interfaces and the Closed Capti...

Страница 18: ...g Italic underline function Two 8 bit internal timer counter 2 ch Conform to CCD REGULATION Time base timer watchdog timer Jitter elimination 16 interrupt sources external 5 internal 11 IIC bus interf...

Страница 19: ...SERVICE MANUAL 3 Block Diagram 17...

Страница 20: ...o ground shorting to VCC load shorting and overheating Maximum Ratings at Ta 25 Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCC max No signal 22 V Allowable power dissipation Pd ma...

Страница 21: ...R 0dBm 40 50 dB Channel separation Sep Rg 10k Vo 0dBm 50 60 dB Muting attenuation ATT Vo 1Vrms BPF 20Hz to 20kHz 80 90 dB VMUTE H Muting on 1 7 3 0 V Muting control voltage The Pin 6 voltage VMUTE L M...

Страница 22: ...tput amplifier Input amplifier Input amplifier Vcc ground shorting protection circuit Load shorting protection circuit Thermal protection circuit IN1 IN2 OUT2 OUT1 PWR GND OUT2 OUT1 Ri 30k Ri 30k 1 Ri...

Страница 23: ......

Страница 24: ......

Страница 25: ...y voltage of 24V and output current of 1 8AP P while LA78041 has supply voltage of 30V and output current of 2 2AP P LA78040 LA78041 N602 Vertical Deflection Output Circuit 1 Features Low power dissip...

Страница 26: ...Extended Temperature Devices Available 8 lead PDIP 8 lead JEDEC SOIC 8 lead MAP and 8 lead TSSOP Package 2 wire Serial EEPROM AT24C01A 1K 128 x 8 AT24C02 2K 256 x 8 AT24C04 4K 512 x 8 AT24C08 8K 1024...

Страница 27: ...ber of other open drain or open collector devices DEVICE PAGE ADDRESSES A2 A1 A0 The A2 A1 and A0 pins are device address inputs that are hard wired for the AT24C01A and the AT24C02 As many as eight 1...

Страница 28: ...the 1K requires a 7 bit data word address for random word addressing AT24C02 2K SERIAL EEPROM Internally organized with 32 pages of 8 bytes each the 2K requires an 8 bit data word address for random...

Страница 29: ...er Supplies SMPS with minimal external components The PWM controller includes integrated fixed frequency oscillator under voltage lockout leading edge blanking LEB optimized gate driver internal soft...

Страница 30: ...IFB VSD TSD Vovp Sync Vocp S Q Q R R 2 5R Vcc good Vcc Drain FB GND AOCP Gate driver Vcc good LEB 600ns PWM Soft start Internal bias Normal operation VBurst Vref Ib Vref Ibufb Burst mode Controller No...

Страница 31: ...ted to the inverting input of the PWM comparator The collector of an opto coupler is typically tied to this pin For stable operation a capacitor should be placed between this pin and GND If the voltag...

Страница 32: ...GS 1M VDGR 650 V Gate Source GND Voltage VGS 30 V Drain Current Pulsed 2 IDM 36 ADC Single Pulsed Avalanche Energy 3 EAS 950 mJ Continuous Drain Current Tc 25 C ID 5 3 ADC Continuous Drain Current TC...

Страница 33: ......

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