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Daewoo DWP-28W2ZLF, Service Manual

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 Appendix                                                                                                     Service manual WP-795

 

- 40 - 

On normal run mode, I501 microcontroller pin 63 (power) is set to high 
 

• 

So, I810 controlled rectifier is not conducting 

 

- Q809 is conducting. So, Q808 is not conducting and Q807 is conducting 
- So, Q807 collector is connected to the ground and I810 controlled rectifier gate pin is set 

to low (no conducting) 

 

• 

So, current from 11V DC voltage (from T801 SMPS transformer pin 13) does not flow through Q811 
and Q810 transistors but flows through I806 IC error amplifier 

 

- Q809 is conducting. So, Q810 is not conducting and no current flows from Q810 collector 

to the ground 

 
Therefore, the power circuit diagram is the following one: 
 
2-9-2-1-2 power supply circuit diagram during TV set normal run 
 

 

Summary of Contents for DWP-28W2ZLF

Page 1: ...memory FASTEXT FLOF or top Aerial input 75ohm unbalanced Channel coverage Off air channels S cable channels and hyperband Tuning System Frequency synthesiser tuning system Visual screen size 66cm wide...

Page 2: ...RINTED CIRCUIT BOARD 16 ELECTRICAL PARTS LIST 17 IC DESCRIPTION 1 TDA936X TV SIGNAL PROCESSOR TELETEXT DECODER WITH EMBEDDED U CONTROLLER 1 MSP3415D MULTISTANDARD SOUND PROCESSOR 9 TDA894XJ STEREO AUD...

Page 3: ...io Video In and Out S VHS In Audio Video Jack on front of cabinet in common connection with EURO SCART 2 Headphone jack 3 5 mm on front of cabinet Remote Control Unit R 40A13 21 Pin EURO SCART 1 Pin S...

Page 4: ...ut Right 0 5 Vrms Impedance 10 k 3 Audio Output Left 0 5 Vrms Impedance 1 k RF 54 Mod 4 Audio Earth 5 Earth 6 Audio Input Left 0 5 Vrms Impedance 10 k 7 N C 8 N C 9 N C 10 N C 11 N C 12 N C 13 Earth 1...

Page 5: ...0 C21 471 25 471 25 471 25 471 25 C22 479 25 479 25 479 25 479 25 C23 487 25 487 25 487 25 487 25 C24 495 25 495 25 495 25 495 25 C25 503 25 503 25 503 25 503 25 C26 511 25 511 25 511 25 511 25 C27 51...

Page 6: ...25 815 25 815 25 815 25 C65 823 25 823 25 823 25 823 25 C66 831 25 831 25 831 25 831 25 C67 839 25 839 25 839 25 839 25 C68 847 25 847 25 847 25 847 25 C69 855 25 855 25 855 25 855 25 C70 863 25 863 2...

Page 7: ...43 25 S27 351 25 351 25 351 25 351 25 S28 359 25 359 25 359 25 359 25 S29 367 25 367 25 367 25 367 25 S30 375 25 375 25 375 25 375 25 S31 383 25 383 25 383 25 383 25 S32 391 25 391 25 391 25 391 25 S3...

Page 8: ...up I Group III It contains all the programs with a weak signal strength which are not listed in group I Group IV If two or more programs with the same code are found only the strongest or if they have...

Page 9: ...Note for satellite receiver users Before starting ATSS turn On your satellite receiver and tune SKY NEWS If GB is selected the TV controlling software seeks for programs only in UHF C21 to C70 The so...

Page 10: ...2 Discharge the high potential of the picture tube before handling the tube The picture tube is highly evacuated and if broken glass fragments will be violently expelled 2 If any Fuse in this TV recei...

Page 11: ...Service manual WP 795 10 3 Circuit Block diagram...

Page 12: ...icrocontroller configuration Option Option Tuner maker 0 DAEWOO SAMSUNG 1 DAEWOO SAMSUNG 2 SIEL 3 PHILIPS 4 3 TV set Alignment 4 3 1 G2 alignment TV in AV mode without video signal Black screen TV pre...

Page 13: ...te for vertical distortion 4 3 5 Horizontal picture centering Adjust H Shift to have the picture in the center of the screen 4 3 6 East West correction Adjust the H Parall H Bow H Width EW Parabo Up C...

Page 14: ...Service manual WP 795 13 EW Trapez 4 3 7 AGC Adjust the antenna signal level at 68 dB V 2 Set RF AGC to 0 Increase RF AGC level and stop when the level on pin 6 of TDA936x goes below 2 5 Vdc...

Page 15: ...14 SCHEMATIC DIAGRAM...

Page 16: ...15 EXPLODED VIEW 1 DWP 28W2ZZF 28W2ZLF...

Page 17: ...16 PRINTED CIRCUIT BOARD PCB MAIN...

Page 18: ...SK FRONT HIPS GY 503A M251 4852534202 GRILL SPKR R PS T0 5 28W2 R M252 4852534203 GRILL SPKR L PS T0 5 28W2 L M591 4855933601 DECO AV PVC T0 5 ZZ202 PTU1MSD395 PCB UNION 1 MANUAL A DWP 28W2ZZF DF01 DS...

Page 19: ...REMARK M361A 7178301212 SCREW TAPPTITE TT2 WAS 3X12 MFZN BK M361B 7172401412 SCREW TAPPTITE TT2 TRS 4X14 MFZN BK M361C 7172401412 SCREW TAPPTITE TT2 TRS 4X14 MFZN BK M381 4853817500 FRAME MAIN PCB FR...

Page 20: ...PART NAME PART DESCRIPTION REMARK E041 4856310600 EYE LET BSR T0 2 R2 3 E042 4856310600 EYE LET BSR T0 2 R2 3 E043 4856310600 EYE LET BSR T0 2 R2 3 E044 4856310600 EYE LET BSR T0 2 R2 3 E045 48563106...

Page 21: ...11 TP C617 CBXF1H104Z C CERA SEMI 50V F 0 1MF Z TAPPING C620 CXCH1H509D C CERA 50V CH 5PF D TAPPING C621 CXCH1H509D C CERA 50V CH 5PF D TAPPING LOC PART CODE PART NAME PART DESCRIPTION REMARK C622 CCX...

Page 22: ...23Z C CERA 50V F 0 022MF Z C535 CCZF1H223Z C CERA 50V F 0 022MF Z C536 CCZF1H223Z C CERA 50V F 0 022MF Z C577 CCZB1H561K C CERA 50V B 560PF K LOC PART CODE PART NAME PART DESCRIPTION REMARK C587 CCZB1...

Page 23: ...23 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J024 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J025 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J026 85801065GY WIRE COPPER AWG22 1 0 65 TI...

Page 24: ...J R113 RD AZ562J R CARBON FILM 1 6 5 6K OHM J R114 RD AZ562J R CARBON FILM 1 6 5 6K OHM J R115 RD AZ682J R CARBON FILM 1 6 6 8K OHM J R116 RD AZ222J R CARBON FILM 1 6 2 2K OHM J LOC PART CODE PART NA...

Page 25: ...OHM J R704 RD AZ151J R CARBON FILM 1 6 150 OHM J LOC PART CODE PART NAME PART DESCRIPTION REMARK R713 RD AZ220J R CARBON FILM 1 6 22 OHM J R720 RD AZ122J R CARBON FILM 1 6 1 2K OHM J R805 RD 2Z100J R...

Page 26: ...J RA44 RD AZ682J R CARBON FILM 1 6 6 8K OHM J RA45 RD AZ101J R CARBON FILM 1 6 100 OHM J RA46 RD AZ101J R CARBON FILM 1 6 100 OHM J RA47 RD AZ470J R CARBON FILM 1 6 47 OHM J RA48 RD AZ102J R CARBON FI...

Page 27: ...DAEWOO ELECTRONICS CO LTD 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC E mail djkoo web dwe co kr TEL 82 2 360 7806 FAX 82 2 360 7877...

Page 28: ...rts of the screen can be chosen independently z Linear RGB or YUV input with fast blanking for external RGB YUV sources The Text OSD signals are internally supplied from the Controller Teletext decode...

Page 29: ...ning underlining and italics z Soft colours using CLUT with 4096 colour palette z Globally selectable scan lines per row 9 10 13 16 and character matrix 12x10 12xl3 12x16 VxH z Fringing Shadow selecta...

Page 30: ...ST VPS on line 16 of VBI Real time capture and decoding for WST Teletext in Hardware to enable optimised microprocessor throughput 10 pages stored On Chip lnventory of transmitted Teletext pages store...

Page 31: ...Appendix Service manual WP 795 4...

Page 32: ...ngarian English German Swedish Finnish Hu ngarian Italian French Portuguese Spanish Turkish Greek Polish Czech Slovakian Romanian Polish German Estonian Serbian Croatian Sl ovenian Czech Slovak Rumani...

Page 33: ...VDRB 21 vertical drive B output VDRA 22 vertical drive A output IFIN1 23 IF input 1 IFIN2 24 IF input 2 IREF 25 reference current input VSC 26 vertical sawtooth capacitor TUNERAGC 27 tuner AGC output...

Page 34: ...mming supply VDDC 56 digital supply to core 3 3V OSCGND 57 oscillator ground supply XTALIN 58 crystal oscillator input XTALOUT 59 crystal oscillator output RESET 60 reset VDDP 61 digital supply to per...

Page 35: ...Appendix Service manual WP 795 8...

Page 36: ...ection The MSP 3415D is designed to simultaneously perform digital demodulation and decoding of NICAM coded TV stereo sound as well as demodulation of FM or AM mono TV sound Alternatively two carrier...

Page 37: ...tereo sound is transmitted digitally The systems allow two high quality digital sound channels to be added to the already existing FM AM channel The sound coding follows the format of the so called Ne...

Page 38: ...FM Mono NICAM PAL UK D K 6 5 6 2578125 D K1 6 5 6 7421875 D K2 6 5 5 85 D K NICAM FM Stereo FM Mono NICAM SECAM East USSR Hungary Architecture of MSP3415D Pin connections and short description Pin No...

Page 39: ...right 34 SC2_OUT_L Out Scart Output 2 left 35 VREF1 Reference ground 1 high voltage part 36 SC1_OUT_R Out Scart output 1 right 37 SC1_OUT_L Out Scart output 1 left 38 NC Not Connected 39 AHVSUP Analo...

Page 40: ...TDA8944J comes in a 17 pin DIL power package Features Few external components Fixed gain Standby and mute mode No on off switching plops low standby current High supply voltage ripple rejection Output...

Page 41: ...class G system Due to the full bridge output circuit the deflection coils can be DC coupled The IC is constructed in a Low Voltage DMOS process that combines Bipolar CMOS and DMOS devices MOS transist...

Page 42: ...ol Description 1 Vi pos input voltage positive 2 Vi neg input voltage negative 3 Vp supply voltage 4 VOB output voltage B 5 GND ground 6 Vflb flyback supply voltage 7 VOA output voltage A 8 VO guard g...

Page 43: ...nk current from the diode modulator circuit Features Few external components Highly efficient fully DC coupled vertical output bridge circuit Short rise and fall time of the vertical flyback switch Gu...

Page 44: ...s Typical bandwidth of 5 5 MHz for an output signal of 60 Vpp High slew rate of 900V ms No external components required Very simple application Single supply voltage of 200V Internal reference voltage...

Page 45: ...utput 6 SCL Serial clock 7 WC Write control 8 Vcc Supply voltage 4 Vss Ground The memory device is compatible with the I2C memory standard This is a two wire serial interface that uses a bi directionn...

Page 46: ...ET and control IC designed for flyback converter type switch mode power supply applications 1 7 2 Features Small SIP fully isolated molded 5 pins package Many protection functions Pulse by pulse overc...

Page 47: ...ime TOFF max 45 55 SEC Minimum time for input of quaxi resonant signals 1 5 TTH 2 1 0 SEC Minimum off time TOFF min 1 5 SEC O C P F B terminal threshold voltage 1 1 5 VTH 1 0 68 0 73 0 78 V O C P F B...

Page 48: ...Appendix Service manual WP 795 21 2 Circuit description 2 1 Block diagram...

Page 49: ...h performance hi fi stereo sound processing can be achieved Video switches The video switch has one input for an external CVBS or Y C signal The selected CVBS signal can be supplied to pin 38 the IF v...

Page 50: ...der The ICs can decode PAL NTSC and SECAM signals The PAL NTSC decoder does not need external reference crystals but has an internal clock generator which is stabilised to the required frequency by us...

Page 51: ...ol circuit The output signal has an amplitude of about 2 Volts black to white at nominal input signals and nominal settings of the various controls To obtain an accurate biasing of the picture tube th...

Page 52: ...tion TV IF audio filter with two channels Channel 1 L with one pass band for sound carrier at 40 40 MHz Channel 2 L D K I B G with one pass band for sound carriers between 32 40 MHz and 33 40 MHz For...

Page 53: ...Appendix Service manual WP 795 26 Chassis block diagram IF...

Page 54: ...ending on Q508 base level External SVHS from SCART 2 The sound source switching is done in the MSP3415D I601 by the Controller via I2C bus Fast R G B insertion The external R G B insertion needs a fas...

Page 55: ...OFF if the voltage on this pin is 2 33V 6 High impedance High impedance For factory use only 7 Key in High impedance High impedance Local keyboard input 8 S SW High impedance See table above external...

Page 56: ...coder When the set is in Auto detection mode default mode after ATSS the controlling software set automatically the sound mode NICAM mono NICAM Dual 1 or NICAM Dual 2 depending on the transmitted mode...

Page 57: ...Appendix Service manual WP 795 30 Sound signal flow diagram...

Page 58: ...fier is operating normally The operating mode is activated at VMODE 0 5 V 2 7 Vertical deflection The vertical driver circuit is a bridge configuration The deflection coil is connected between the out...

Page 59: ...damping resistor R305 is connected across the deflection coil EAST WEST Amplifier TDA8358J only The East West amplifier is current driven It can only sink currents of the diode modulator circuit A fe...

Page 60: ...l IC designed for flyback converter type switch mode power supply applications 2 8 2Power supply primary part operations An oscillator generates pulses signals which turn on and off a MOSFET transisto...

Page 61: ...tage does not increase to the set voltage immediately after the control circuit starts operating VIN starts dropping However as this winding voltage reaches the set value before VIN voltage drops to t...

Page 62: ...Appendix Service manual WP 795 35 2 8 2 1 STR F6653 oscillating operation...

Page 63: ...termined by C1 and R1 is the OFF time of the MOSFET F When C1 voltage falls to around 3 7V the STR F6653 internal oscillator is reversed again and the MOSFET turns ON C1 is quickly charged to around 6...

Page 64: ...troller power supply pins pins 54 56 61 and to the reset pulse circuit which provides reset pulse to I501 microcontroller reset pin pin 60 Then the microcontroller starts its initialization Its power...

Page 65: ...pulse circuit 2 9 1 4 Reset pulse circuit operations description When DC supply voltage from I823 regulator starts rising from 0V to 1 2V no current flows through D591 zener diode So Q510 is in off mo...

Page 66: ...ely Q511 starts conducting pulling I501 pin 60 high At the same time it discharges the reset capacitor C501 Discharging this capacitor is necessary to garantee a defined reset pulse duration 2 9 2 TV...

Page 67: ...he ground and I810 controlled rectifier gate pin is set to low no conducting So current from 11V DC voltage from T801 SMPS transformer pin 13 does not flow through Q811 and Q810 transistors but flows...

Page 68: ...required on this line 143V supply voltage line includes an IC error amplifier I806 which corrects unexpected DC voltage variations on this line 2 9 2 1 4 power supply IC delivery during TV set normal...

Page 69: ...Appendix Service manual WP 795 42 2 9 2 2 TV set on stand by mode 2 9 2 2 1 TV set circuit diagram on stand by mode...

Page 70: ...flows from pin 16 SMPS transformer to the ground via I804 photo coupler and Q810 and Q811 transistors which are conducting In these conditions I801 delivers pulses on light mode and T801 produces vol...

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