Daewoo DTE-29G3ZZR Service Manual
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Daewoo DTE-29G3ZZR Service Manual

Daewoo DTE-29G3ZZR Service Manual

Color television 68cm stereo
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Service Manual

Color Television 68cm Stereo
CHASSIS : CP-795
Model : DTE-29G3ZZR
DTE-29G3KZR
Specirication
Items
Model
TV Standard
PAL-SECAM B/G D/K,PAL I/I,SECAM L/L
Sound System
NICAM B/G,I,D/K,L,FM2Carrier B/G,D/K
Power Consumption
Sound Output Power
Speaker
Teletext System
10page memory FASTEXT(FLOF or top)
Aerial input
Channel coverage
Off-air channels, S-cable channels and hyperband
Tuning System
Visual screen size
Channel indication
Program Selection
Aux. terminal
EURO-SCART1:Audio/Video In and Out,
R/G/B In, slow and fast switching.
EURO-SCART2:Audio/Video In and Out, S-VHS In.
Audio-Video jack on front of cabinet in common
connection with EURO-SCART2.
Headphone jack(3.5mm)on front of cabinet
Remote Control Unit
DAEWOO ELECTRONICS CO., LTD
http : //svc.dwe.co.kr
S/M No. : TCP795MEFO
DTE-29G3ZZR/DTE-29G3KZR
70W approx.
6W X 2(at60% mod,10%THD)
12W 8 ohm X 2
75ohm unbalanced
Frequency synthesiser tuning system
68cm(DIAGONAL)
On Screen Display
100programmes
R-40A13
March.2001

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Summary of Contents for Daewoo DTE-29G3ZZR

  • Page 1: Service Manual

    S/M No. : TCP795MEFO Service Manual Color Television 68cm Stereo CHASSIS : CP-795 Model : DTE-29G3ZZR DTE-29G3KZR Specirication Items Model DTE-29G3ZZR/DTE-29G3KZR TV Standard PAL-SECAM B/G D/K,PAL I/I,SECAM L/L Sound System NICAM B/G,I,D/K,L,FM2Carrier B/G,D/K Power Consumption 70W approx. Sound Output Power...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS MAIN FEATURES ........................SPECIFICATIONS ................................ 2 CHANNEL TABLE ................................ 4 SAFETY INSTRUCTION ....................9 CIRCUIT BLOCK DIAGRAM ................... 10 ALIGNMENT INSTRUCTIONS ..................11 MICROCONTROLLER CONFIGURATION:SERVICE MODE ..................11 MICROCONTROLLER CONFIGURATION:OPTION ....................11 TV SET ALIGNMENT ..............................11 SCHEMATIC DIAGRAM ....................

  • Page 3: Main Features

    Service manual CP-795 1-Main features 1-1 Specifications TV standard PAL - SECAM B/G D/K, PAL I/I, SECAM L/L’ Sound system NICAM B/G, I, D/K, L, FM 2Carrier B/G, D/K Power consumption 70 W approx. Sound Output Power 6Wx 2 (at 60% mod, 10%THD) Speaker 12W 8 ohm x2 Teletext system...
  • Page 4 Service manual CP-795 Video Input 1 Vpp ± 3dB, Impedance 75 Common Earth 21 Pin EURO-SCART 2: Signal Description Matching value Audio Output Right 0.5 Vrms, Impedance < 1 , ( RF 54% Mod ) Audio Input Right 0.5 Vrms, Impedance > 10 Audio Output Left 0.5 Vrms, Impedance <...

  • Page 5: Channel Table

    Service manual CP-795 1-2 Channel table FREQUENCY TABLE EUROPE CCIR FRANCE GB(IRELAND) EAST OIRT 46.25 45.75 49.75 48.25 55.75 (L’) 53.75 59.25 55.25 60.5 (L’) 61.75 77.25 62.25 63.75 (L’) 175.25 85.25 175.25 176.00 183.25 93.25 182.25 184.00 191.25 175.25 189.25 192.00 199.25...
  • Page 6 Service manual CP-795 671.25 671.25 671.25 671.25 679.25 679.25 679.25 679.25 687.25 687.25 687.25 687.25 695.25 695.25 695.25 695.25 703.25 703.25 703.25 703.25 711.25 711.25 711.25 711.25 719.25 719.25 719.25 719.25 727.25 727.25 727.25 727.25 735.25 735.25 735.25 735.25 743.25 743.25 743.25 743.25...
  • Page 7 Service manual CP-795 280.25 136.00 295.25 280.25 287.25 160.00 303.25 287.25 294.25 294.25 303.25 303.25 303.25 311.25 311.25 311.25 311.25 319.25 319.25 319.25 319.25 327.25 327.25 327.25 327.25 335.25 335.25 335.25 335.25 343.25 343.25 343.25 343.25 351.25 351.25 351.25 351.25 359.25 359.25 359.25...
  • Page 8 Service manual CP-795 1-3 ATSS sorting method The TV set sweeps all the TV bands from beginning of VHF to end of UHF. The TV controlling software for each program checks if a VPS CNI code is transmitted. If no VPS CNI code is found, the system check if a CNI code is transmitted in the teletext lines ( Packet 8/30 format 1 ).
  • Page 9 Service manual CP-795 Special case : France If France is selected the TV controlling software sweeps the whole TV bands firstly with France system selected ( positive video modulation) and secondly with Europe system selected ( negative video modulation). Special case : Switzerland If Switzerland is selected the TV controlling software sweeps the whole TV bands firstly with Europe system selected (negative video modulation) and secondly with France system selected ( positive video modulation).

  • Page 10: Safety Instruction

    Service manual CP-795 2 - Safety instruction WARNING: Only competent service personnel may carry out work involving the testing or repair of this equipment. X-RAY RADIATION PRECAUTION 1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the high voltage must not exceed the specified limit.
  • Page 11 Service manual CP-795 - 10 -...

  • Page 12: Alignment Instructions

    In Service Mode press “OK” to stop the microcontroller i.e. the I2C bus is free and the set can be controlled by external equipment. Press “OK” again to allow the microcontroller to control the set again 4-2 Microcontroller configuration : Option Option Tuner maker DAEWOO/SAMSUNG DAEWOO/SAMSUNG SIEL PHILIPS 4-3 TV set Alignment 4-3-1 - G2 alignment - TV in AV mode without video signal Þ...
  • Page 13 Service manual CP-795 4-3-4 - Vertical geometry - Adjust the Vertical Amplitude, Shift, S- Correction and Slope to compensate 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 Corner, Dw Corner, EW trapez to compensate for geometrical distortion.
  • Page 14 Service manual CP-795 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 - 13 -...

  • Page 15: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 16: Exploded View

    EXPLODED VIEW 1. DTE-29G3ZZR/29G3KZR - 15 -...

  • Page 17: Printed Circuit Board

    PRINTED CIRCUIT BOARD PCB MAIN...

  • Page 18: Service Parts List

    4858215600 BAG P.E PE FOAM t0.5x1600x1270 SWF01 5S40101143 SW POWER PUSH PS3-22SP (P.C.B) ZZ131 48519A4210 CRT GROUND NET 2901H-1015-2P ZZ200 PTCTJRD416 PCB CONTROL RADIAL AS DTE-29G3ZZR ZZ132 58G0000145 COIL DEGAUSSING DC-29S2 SW02 5S50101090 SW TACT THVH472GCA ZZ140 PTCACAD416 CABINET AS...

  • Page 19: Electrical Parts List

    AL EX Z501 5PYXT5R5MB FILTER CERA XT 5.5MB 0000B 7174300811 SCREW TAPPTITE TT2 RND 3X8 MFZN ZZ200 PTMPJ0D416 PCB MAIN (RHU) AS DTE-29G3ZZR I804 1KP1010C-- IC PHOTO COUPLER KP-1010C C305 CEXF1E471V C ELECTRO 25V RSS 470MF (10X16) TP I806 1SE130N--- SE130N ®...
  • Page 20 R M-OXIDE FILM 2W 820 OHM J SMALL C602 CEXF1H100V C ELECTRO 50V RSS 10MF (5X11) TP ZZ200 PTMPJRD416 PCB MAIN RADIAL AS DTE-29G3ZZR C603 CCXB1H472K C CERA 50V B 4700PF K (TAPPING) C101 CEXF1H100V C ELECTRO 50V RSS 10MF (5X11) TP...
  • Page 21 5PXF1B471M FILTER EMI CFI 06 B 1H 470PF C820 CCXB3A471K C CERA 1KV B 470PF K (T) ZZ200 PTMPJAD416 PCB MAIN AXIAL AS DTE-29G3ZZR C821 CCXB1H102K C CERA 50V B 1000PF K (TAPPING) 2TM14006LB TAPE MASKING 3M #232 6.0X2000M C824...
  • Page 22 ELECTRICAL PARTS LIST PART CODE PART NAME PART DESCRIPTION REMARK LOC PART CODE PART NAME PART DESCRIPTION REMARK DA13 CBZR1C222M C CERA 16V Y5R 2200PF M (AXIAL) D411 D1N4004S-- DIODE 1N4004S DA14 CBZR1C222M C CERA 16V Y5R 2200PF M (AXIAL) D414 D1N4004S-- DIODE...
  • Page 23 ELECTRICAL PARTS LIST LOC PART CODE PART NAME PART DESCRIPTION REMARK PART CODE PART NAME PART DESCRIPTION REMARK R404 RD-4Z399J- R CARBON FILM 1/4 3.9 OHM J R580 RD-AZ561J- R CARBON FILM 1/6 560 OHM J R410 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING R585 RD-AZ224J-...
  • Page 24 ELECTRICAL PARTS LIST PART CODE PART NAME PART DESCRIPTION REMARK R842 RD-4Z100J- R CARBON FILM 1/4 10 OHM J R850 RD-2Z479J- R CARBON FILM 1/2 4.7 OHM J R855 RD-4Z225J- R CARBON FILM 1/4 2.2M OHM J R870 RD-2Z222J- R CARBON FILM 1/2 2.2K OHM J R888 RD-AZ103J-...
  • Page 25 686, 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 26: Ic Description

    Appendix Service manual CP-795 1 - IC description 1-1 TDA936x TV signal processor - Teletext decoder with embedded µ-Controller. TV-signal Processor Multi-standard vision IF circuit with alignment-free PLL demodulator Internal (switchable) time-constant for the IF-AGC circuit Source selection between 'Internal' CVBS and external CVBS or Y/C signals Integrated chrominance trap circuit Integrated luminance delay line with adjustable delay time Asymmetrical ‘delay line type’...
  • Page 27 Appendix Service manual CP-795 Data Capture Text memory 10 pages 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 Wide Screen Signalling (WSS) bit decoding Automatic selection between 525 WST/625 WST Automatic selection between 625 WST/VPS on line 16 of VBI Real-time capture and decoding for WST Teletext in Hardware, to enable optimised µ-processor...
  • Page 28 Appendix Service manual CP-795 Data Capture Features - Video Signal Quality detector - Data Capture for 625 line WST - Data Capture for 525 line WST - Data Capture for US Closed Caption - Data Capture for VPS data (PDC system A) - Data Capture for Wide Screen Signalling (WSS) bit decoding - Automatic selection between 525 WST/625WST - Automatic selection between 625WST/VPS on line 16 of VBI...
  • Page 29 Appendix Service manual CP-795 - 4 -...
  • Page 30 Appendix Service manual CP-795 TV processor version and -Controller capacity IC version TDA9365 Nx / 3 TV range 110° QSS sound IF amplifier with separated input and AGC circuit PAL decoder SECAM decoder NTSC decoder Horizontal geometry (E-W) Horizontal and vertical zoom ROM size 64 k RAM size...
  • Page 31 Appendix Service manual CP-795 RF AGC in ADC 1 : For factory use only ( High impedance ) Key-in ADC 2 : local key input ( High impedance ) S/SW ADC 3 : Scart Slow switching input ( See XXX) VssC/P digital ground for m-controller core and peripheral LED 1...
  • Page 32 Appendix Service manual CP-795 BLUE Output VDDA analog supply of Teletext decoder and digital supply of TV- Processor (3.3V) OTP programming supply VDDC digital supply to core (3.3V) OSCGND oscillator ground supply XTALIN crystal oscillator input XTALOUT crystal oscillator output RESET reset VDDP...
  • Page 33 Appendix Service manual CP-795 - 8 -...

  • Page 34: Msp3415D Multistandard Sound Processor

    Appendix Service manual CP-795 1-2 MSP3415D Multistandard Sound Processor The MSP 3415D is designed as a single-chip Multistandard Sound Processor for applications in analogue and digital TV sets, video recorders, and PC cards. MSP 3415D features - sound IF input - No external filters required - Stereo baseband input via integrated AD converters - Two pairs of DA converters...
  • Page 35 Appendix Service manual CP-795 - simple controlling of volume, bass, treble Analogue Section - two selectable analogue pairs of audio baseband input (= two SCART inputs) input level: <2 V RMS, input impedance: >25 kΩ - one selectable analogue mono input (i.e. AM sound): Not used in this chassis - two high-quality A/D converters, S/N-Ratio: >85 dB - 20 Hz to 20 kHz bandwidth for SCART-to-SCART copy facilities - loudspeaker: one pair of four-fold oversampled D/A converters...
  • Page 36 Appendix Service manual CP-795 TV standards Position of sound carrier Sound modulation Color system Country system (MHz) 5.5 / 5.7421875 FM Stereo Germany 5.5 / 5.85 FM-Mono / NICAM Scandinavia, Spain 6.5 / 5.85 AM - Mono / NICAM SECAM-L France 6.0 / 6.552 FM-Mono / NICAM...
  • Page 37 Appendix Service manual CP-795 In / Out Test pin In / Out Test pin Test pin Not Connected Test pin Test pin Test pin DVSUP Digital power supply +5V DVSS Digital Ground Not Connected Not Connected Not Connected Not Connected RESETQ Power-On-reset Not Connected...

  • Page 38: Tda894Xj Stereo Audio Amplifier

    Appendix Service manual CP-795 ANA_IN1- IF common Not Connected TESTEN Test pin XTAL_IN Crystal oscillator XTAL_OUT Crystal oscillator Test pin 1-3 TDA894xJ Stereo Audio Amplifier The TDA 8944J ( TDA 8946J ) is a dual-channel audio power amplifier with an output power of 2 x 7 W ( 2 x 15 W ) at an 8 Ω...

  • Page 39: Tda835Xj Vertical Amplifier

    Appendix Service manual CP-795 Block diagram TDA8944J 1-4 TDA835xJ Vertical Amplifier The TDA835xJ are power circuit for use in 90° and 110° colour deflection systems for field frequencies of 25 to 200Hz and 16/9 picture tubes. The circuit provides a DC driven vertical deflection output circuit, operating as a highly efficient class G system.
  • Page 40 Appendix Service manual CP-795 Pinning Symbol Description Vi(pos) input voltage (positive) Vi(neg) input voltage (negative) supply voltage output voltage B ground Vflb flyback supply voltage output voltage A guard output voltage O(guard) input measuring resistor - 15 -...
  • Page 41 Appendix Service manual CP-795 1-4-1 TDA8358J An East-West output stage is provided that is able to sink 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 - Guard circuit - Temperature (thermal) protection - High EMC because of common mode inputs...

  • Page 42: Tda6107Q

    Appendix Service manual CP-795 1-5 TDA6107Q The TDA6107Q includes three video output amplifiers in one plastic DIL-Bent-SIL 9-pin medium power package, using high voltage DMOS technology, and is intended to drive the three cathodes of a colour CRT directly. To obtain maximum performance, the amplifier should be used with black-current control.

  • Page 43: 24C16 16Kbit Eeprom

    Appendix Service manual CP-795 Block diagram TDA6107Q 1-6 24C16 16 Kbit EEPROM features : - 16 Kbit serial I2C bus EEPROM - Single supply voltage : 4.5 V to 5.5 V - 1 Million Erase/Write cycles (minimum) - 40 year data retention (minimum) Pin description Pin No.

  • Page 44: Str-F6653

    Appendix Service manual CP-795 1-7 STR - F6653 1-7-1 General description The STR-F6653 is an hybrid IC with a build-in MOSFET 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 overcurrent protection (OCP) * Overvoltage protection with latch mode (OVP)
  • Page 45 Appendix Service manual CP-795 1-7 -4 pin description NAME SYMBOL DESCRIPTION Overcurrently O.C. P/E.B. Input of over current detection signal and feedback feedback signal Source Mosfet source Drain Mosfet drain Supply Input of power supply for control circuit Ground Ground 1-7 -5 Control part - electrical characteristics IC pins Rating...
  • Page 46 Appendix Service manual CP-795 2 - Circuit description 2-1 Block diagram - 21 -...
  • Page 47 Appendix Service manual CP-795 FUNCTIONAL DESCRIPTION OF VIDEO PROCESSOR Vision IF amplifier The vision IF amplifier can demodulate signals with positive and negative modulation. The PLL demodulator is completely alignment-free. The VCO of the PLL circuit is internal and the frequency is fixed to the required value by using the clock frequency of the µ-Controller/Teletext decoder as a reference.
  • Page 48 Appendix Service manual CP-795 In the type TDA9367, intended for 90° picture tubes the following geometry parameters can be adjusted: • Horizontal shift • Vertical amplitude • Vertical slope • S-correction • Vertical shift The types which are intended to be used in combination with 110° picture tubes have an East-West control circuit.
  • Page 49 Appendix Service manual CP-795 The SECAM decoder contains an auto-calibrating PLL demodulator which has two references, via the divided 12 MHz reference frequency (obtained from the µ-Controller) which is used to tune the PLL to the desired free-running frequency and the bandgap reference to obtain the correct absolute value of the output signal.
  • Page 50 Appendix Service manual CP-795 2-2 IF The TDA936x has an alignment free IF PLL demodulator. The fully integrated oscillator is automatically calibrated, using the 12 MHz crystal as a frequency reference. The IF frequency is simply set in TV- Processor by I2C bus. The AFC information is available via I2C bus from the TV-Processor status bytes.
  • Page 51 Appendix Service manual CP-795 Chassis block diagram : IF - 26 -...

  • Page 52: Source Switching

    Appendix Service manual CP-795 2-3 Source switching The TDA936x has only one external video input, the external video switching circuit made with Q504, Q505, Q507, Q508 and Q509 allows 2 external video signal inputs. The switching command can be either the SCART1 slow switching pin 8 or the µ-Controller pin 8 when the software takes control of the video source.

  • Page 53: U-Controller I/O Pin Configuration And Function

    Appendix Service manual CP-795 Push-Pull The push pull mode can be used for output only. Both sinking and sourcing is active, which leads to sleep slopes. The levels are 0 and Vddp, the supply voltage 3.3Volts. High impedance This mode can be used for input only operation of the port. Special port for LED Pin 11 has the same functionality as the general I/O pins but in addition, their current source and sink capacity is 8 mA instead of 4 mA.
  • Page 54 Appendix Service manual CP-795 Phase and AM discrimination The filtered sound IF signals are demodulated by means of the phase and amplitude discriminator block. On the output, the phase and amplitude is available for further processing. AM signals are derived from the amplitude information, whereas the phase information serves for FM and NICAM demodulation.
  • Page 55 Appendix Service manual CP-795 Sound signal flow diagram - 30 -...

  • Page 56: Sound Amplification

    Appendix Service manual CP-795 2-6 Sound amplification The TDA8944J (TDA8946J) is a stereo BTL audio amplifier capable of delivering 2 x 7 W (2 x 15 W) output power to an 8 Ω load at THD = 10%, using a 12 V power supply and an external heatsink. The voltage gain is fixed at 32dB.
  • Page 57 Appendix Service manual CP-795 The guard signal is not used by the TDA936x to blank the screen in case of fault condition. Damping resistor For HF loop stability a damping resistor (R305) is connected across the deflection coil. EAST-WEST Amplifier (TDA8358J only) The East-West amplifier is current driven.

  • Page 58: Power Supply

    Appendix Service manual CP-795 2-8 Power supply (STR F6653) 2-8 -1 STR-F6653 general description The STR-F6653 is an hybrid IC with a build-in MOSFET and control 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 transistor.
  • Page 59 Appendix Service manual CP-795 When the power switch is pushed on, V increases slowly. During this time, C806 is charged through R802. As soon as V reaches 16V, the STR-F6653 control circuit starts operating. Then, V is obtained by smoothing the winding voltage which appears between pin6 and pin7 of the SMPS transformer. As this winding voltage does not increase to the set voltage immediately after the control circuit starts operating, V starts dropping.
  • Page 60 Appendix Service manual CP-795 2-8 -2-1 STR-F6653 oscillating operation - 35 -...
  • Page 61 Appendix Service manual CP-795 When the MOSFET is ON, the STR-F6653 internal capacitor C1 is charged at the constant voltage 6.5V. At the same time, the voltage at pin 1 (OCP / FB) increases with the same waveform as the MOSFET drain current.

  • Page 62: Tv Start-Up, Tv Normal Run And Stand-By Mode Operations

    Appendix Service manual CP-795 2-9 TV start-up, TV normal run and stand-by mode operations 2-9 1 TV start-up operations 2-9-1-1 Schematic diagram for start-up operations 2-9-1-2 TV start-up and microcontroller initialization - When SW801 power switch is pushed, main AC voltage is applied to T801 transformer (after rectification by D801...D804 diodes).
  • Page 63 Appendix Service manual CP-795 . If the TV set was on stand-by mode before switching off, the microcontroller switches TV set to stand-by mode, decreasing power pin voltage (pin 63). this matter will be explained on paragraph 5-9-2-b. 2-9-1-3 Reset 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.
  • Page 64 Appendix Service manual CP-795 - When the DC supply voltage reaches (2.4V +0.6V ) =3.0V, Q510 starts conducting but as the Q511 base-emitter voltage is the same as the collector-emitter voltage of the saturated Q510, Q511 switches off and no voltage reaches I501 pin 60. - If the DC supply voltage decreases below 3 V, Q510 switches off immediately.
  • Page 65 Appendix Service manual CP-795 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) •...
  • Page 66 Appendix Service manual CP-795 2-9-2-1-3 power supply functioning during TV set normal run mode - I801 transmits controlled pulses to T801 which generates DC voltages after rectifications by secondary part diodes and electro capacitors (by example by D820 and C813 on 143V supply voltage line). - 8V, 5V, 3.3V supply voltage lines have stabilized voltages obtained by I820, I822, I823 voltage regulators.
  • Page 67 Appendix Service manual CP-795 2-9-2-2 TV set on stand-by mode 2-9-2-2-1 TV set circuit diagram on stand-by mode - 42 -...
  • Page 68 Appendix Service manual CP-795 2-9-2-2-2 TV set stand-by mode operations -On stand-by mode, I501 microcontroller pin 63 (power) is set to low. - So, Q809 collector is set to high. -Then, I810 controlled rectifier gate pin is set to high and I810 is conducting. - So, current flows from pin 16 SMPS transformer to the ground via I804 photo coupler and Q810 and Q811 transistors (which are conducting).

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