background image

 

 

 

Adjustable Items   
 

Direct access key   

Items 

Description 

Preset 

Remark 

1

 

5/6HSH 

Horizontal shift 

ON 

 

 

 

 

 

2

 

5/6VSL 

Vertical slop 

32 

 

5/6VAM 

Vertical amplitude 

23 

 

5/6SCL 

S-correction 

17 

 

5/6VSH 

Vertical shift 

27 

 

5/6VOF 

OSD Vertical offset 

37 

 

HOF* 

OSD Horizontal offset 

42 

 

 

 

 

 

3

 

RED 

Black level offset R 

32 

 

GRN 

Black level offset G 

32 

 

WPR 

White point R 

30 

 

WPG 

White point G 

26 

 

WPB 

White point B 

38 

 

 

 

 

 

4

 

TOP 

AGC Take-over point 

20 

 

VOL 

Volume 

42 

 

 

9860 

Sub-volume of TDA9860/59

 

18 

 

 

HDOL 

Cathode drive level 

59 

 

 

AGC 

IF AGC speed 

 

 

VG2B 

VG2 Brightness 

42 

 

 

IFFS 

 

 

 

 

 

 

 

5

 

Picture preset 1 

 

 

 

 

0CON 

Listen: Contrast 

 

0BRI 

Listen: Brightness 

 

0COL 

Listen: Colour 

50 

 

0SHP 

Listen: Sharpness 

50 

 

1CON 

Soft: Contrast 

45 

 

1BRI 

Soft: Brightness 

45 

 

1COL 

Soft: Colour 

50 

 

1SHP 

Soft: Sharpness 

50 

 

 

 

 

 

6

 

Picture preset 2 

 

 

 

 

2CON 

Standard: Contrast 

75 

 

2BRI 

Standard: Brightness 

50 

 

2COL 

Standard: Colour 

50 

 

2SHP 

Standard: Sharpness 

60 

 

3CON 

Dynamic: Contrast 

85 

 

3BRI 

Dynamic: Brightness 

60 

 

3COL 

Dynamic: Colour 

60 

 

3SHP 

Dynamic: Sharpness 

80 

 
NOTE: THE ITEMS WITH REMARK 

A

 IS ADJUSTABLE DATA.   

 
 
Optional data 

1.    OP1 

Bit 

Function 

Description 

Preset 

Remark 

Bit 0 

VG2_MODE 

1= 

EA 

Bit 1 

YPRPB 

1=Enable 

EA 

Bit 2 

SUPERWOOFER 

Translucence OSD manual    1=Enable 

EA 

Bit 3 

WOOFER_VOL 

1=Enable (Can only be selected either RGB and DVD)  0 

EA 

Bit 4 

AV2 

1=Enable 

EA 

Bit 5 

SVHS 

1=Enable 

EA 

Bit 6 

DVD 

1=Enable 

EA 

Bit 7 

RGB 

1=Enable 

EA 

 

 

                    

                                             

                          

Summary of Contents for IS-TVDVD20A

Page 1: ...r Television SERVICE MANUAL IS TVDVD20A l FEATURES l DVD TV 21 COMBO l AUTO TUNE 181 CHANNES l DVD VCD SVCD CD CD R CD RW JPEG MP3 COMPATIBLE l FORMATO DE VIDEO 4 3PS 4 3LB l DOLBY AC 3 DECODE l PANATAL LOCK ...

Page 2: ... Replacement of memory IC 5 4 Service adjustment 5 5 ICs functional description 8 6 Test point waveform 10 7 All ICs voltages 10 8 Purity convergence adjustment 11 9 DVD maintenance 13 10 List of Parts 14 11 Circuit diagram Attached 12 Exploded view Attached ...

Page 3: ...not check high voltage by drawing an arc Use a high voltage meter or a high voltage probe with a VTVM Discharge the picture tube before attempting meter connection by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10kΩ 2W resistor to the anode button 8 When service is required observe the original lead dress Extra precaution should be given to assure ...

Page 4: ... 4 2 Block diagram TDA8377PS N2 series with mono intercarrier sound demodulator ...

Page 5: ...data adjustment of corresponding factory menus Press EXIT key to exit factory mode Focus adjustment 1 Receive a crosshatch signal 2 While watching the screen adjust the FOCUS VR on the FBT to make the vertical and horizontal lines as fine and sharp as possible Geometrical adjustment Receive PAL standard complete pattern signal Adjustment steps a Adjust VSL to the centre horizontal line just appear...

Page 6: ...t 0 A 0BRI Listen Brightness 0 A 0COL Listen Colour 50 A 0SHP Listen Sharpness 50 A 1CON Soft Contrast 45 A 1BRI Soft Brightness 45 A 1COL Soft Colour 50 A 1SHP Soft Sharpness 50 A 6 Picture preset 2 2CON Standard Contrast 75 A 2BRI Standard Brightness 50 A 2COL Standard Colour 50 A 2SHP Standard Sharpness 60 A 3CON Dynamic Contrast 85 A 3BRI Dynamic Brightness 60 A 3COL Dynamic Colour 60 A 3SHP D...

Page 7: ...on Description Preset Remark Bit 6 HALFTONE 1 Enable 1 EA Bit 5 IDENT_SENSITIVE 1 EA Bit 4 HCO 1 Enable 0 EA Bit 3 LOGO 1 EA Bit 2 TILT 0 EA Bit 1 SPANISH 1 EA Bit 0 ROMANIA 0 EA 5 OP5 Bit Function Description Preset Remark Bit 7 STORE_AV 1 Enable 1 EA Bit 6 OSO 1 Enable 0 EA Bit 5 SOFR_CHANGE 1 Enable 0 EA Bit 4 FADE 1 Enable 0 EA Bit 3 SOUND_M 1 Enable 0 EA Bit 2 SOUND_I 1 Enable 0 EA Bit 1 SOUN...

Page 8: ...N DESCRIPTION STAND BY output 1 In STAND BY mode low level Power OFF For Power ON this pin will be high SCL 2 I2 C bus clock line SDA 3 I2 C bus data line TUNING 4 tuning Voltage Vt PWM output KEY 5 Control keys input SYSTEM 6 TV system control VOL 7 Sound Volume control PWM output MUTE 8 Sound mute output VSSC P 9 Digit ground for μ controller core and periphery CTL 10 DVD power control STANDBY 1...

Page 9: ... B input U B Y input PB input BCLIN 49 Beam current limiter input BLKIN 50 Black current input RO 51 Red output GO 52 Green output BO 53 Blue output VDDA 54 Analog supply of Closed Caption decoder and digital supply of TV processor 3 3 V VPE 55 Ground VDDC 56 Digital supply to core 3 3 V OSCGND 57 Oscillator ground supply XTALIN 58 Crystal oscillator input XTALOUT 59 Crystal oscillator output RESE...

Page 10: ... output V FEEDBACK 9 Vertical feedback GND 5 Ground 5 U101 Tuner PIN Function PIN Function 1 AGC 7 5V 2 vacant 8 vacant 3 Gnd 9 Vt 33V 4 SCL 10 Gnd 5 SDA 11 IF Out 6 5V 6 Test point Waveforms 5Vpp 0 9Vpp 1 3Vpp H H 1Vpp V CRT KB CRT KG CRT KR 95Vpp 95Vpp 95Vpp H H H TDA8377PIN53 2 5Vpp 2 5Vpp 3 8Vpp H H H TDA8377PIN52 TDA8377 PIN51 TDA8377 PIN33 TDA8377 PIN34 0 8Vpp V TDA8377 PIN21 TDA8377 PIN22 T...

Page 11: ...5 36 37 38 39 40 41 42 43 44 45 46 47 48 V 0 5 0 3 0 1 7 2 4 3 4 8 3 9 0 3 3 0 3 6 1 4 2 5 2 5 2 5 PIN 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 V 1 9 5 0 2 4 2 4 2 4 3 1 0 3 2 0 1 8 1 7 0 3 2 5 1 3 3 5 TDA8357 PIN 1 2 3 4 5 6 7 8 9 V 0 8 0 7 16 6 9 0 43 7 2 0 3 7 2 AN 7522N PIN 1 2 3 4 5 6 7 8 9 10 11 12 V 10 4 4 0 4 4 2 75 1 4 0 1 4 0 35 4 4 0 4 4 24C08 PCF8598 PIN 1 2 3 4 5 6 7 8 V 0 0 5 ...

Page 12: ...the screen Fig 3 8 Move the deflection yoke forward and fix the position of the deflection yoke so that the whole screen will become green 9 Insert the wedge to the top side of the deflection yoke so that it will not move 10 Input a crosshatch signal 11 Verify that the screen is horizontal 12 Input red and blue raster signals and make sure that purity is properly adjusted CRT WEDGE DEFLECTION YOKE...

Page 13: ...t convergence DYNAMIC CONVERGENCE ADJUSTMENT 1 Move the deflection yoke up and down and overlap lines in the periphery Fig 2 2 Move the deflection yoke left to right and overlap the lines in the periphery Fig 3 3 Repeat 1 and 2 above and make the best convergence After adjustment fix the wedge at the original position Fasten the retainer screw of the deflection yoke Fix the 6 magnets with glue FRO...

Page 14: ...udio DAC are exist if there is signal missing then check the signal line between MT1379 and Audio DAC If the line is connected properly but there is no signal then check if there is any welding problem at the corresponding pins of MT1379 If it is still OK it is probably the problem on MT1379 itself 2 All the required signals are exist while there is no audio output Then you need to check the lower...

Page 15: ...15 Sincere Forever ...

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