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Sony KV-28EW20B Service Manual
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Sony KV-28EW20B Service Manual

Sony KV-28EW20B Service Manual

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SERVICE MANUAL

MODEL
KV-28EW20B
KV-28EW20E
COMMANDER
DEST
CHASSIS NO.
RM-887
FR
SCC-Q54N-A
RM-887
ESP
SCC-Q53P-A
MODEL
KV-28EW20U
KV-28EW20
- 1 -
FE-2
CHASSIS
COMMANDER
DEST
CHASSIS NO.
RM-887
UK
SCC-Q52M-A
RM-887

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  • Page 1: Service Manual

    SERVICE MANUAL FE-2 CHASSIS MODEL MODEL COMMANDER DEST CHASSIS NO. COMMANDER DEST CHASSIS NO. KV-28EW20B KV-28EW20U RM-887 SCC-Q54N-A RM-887 SCC-Q52M-A KV-28EW20E RM-887 SCC-Q53P-A KV-28EW20 RM-887 - 1 -...

  • Page 2: Table Of Contents

    TANCE CRITIQUE POUR LA SÈCURITÈ DU FONCTIONNEMENT, THESE COMPONENTS WITH SONY PARTS WHOSE PART NE LES REMPLACER QUE PAR DES COMPSANTS SONY DONT NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN LE NUMÈRO DE PIÈCE EST INDIQUÈ DANS LE PRÈSENT SUPPLEMENTS PUBLISHED BY SONY.
  • Page 3 y l l . s l . s l . s l . s l e i l & . s l i n i WARNING (UK Models only) The flexible mains lead is supplied connected to a B.S. 1363 fused plug having a fuse of 5 AMP rating.

  • Page 4: Connectors

    21 pin connector Pin No Signal Signal level Audio output B Standard level : 0.5V rms (right) Output impedence : Less than 1kohm* Audio output B Standard level : 0.5V rms (right) Output impedence : More than 10kohm* Audio output A Standard level : 0.5V rms (left) Output impedence : Less than 1kohm*...

  • Page 5: Self Diagnostic Software

    FE-2 SELF DIAGNOSTIC SOFTWARE The identification of errors within the FE-2 chassis is triggered in one of two ways :- 1: Busy or 2: Device failure to respond to IIC. In the event of one of these situations arising the software will first try to release the bus if busy (Failure to do so will report with a continuous flashing LED) and then communicate with each device in turn to establish if a device is faulty.

  • Page 6: General

    SECTION 1 GENERAL - 6 -...
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  • Page 13: Disassembly

    SECTION 2 DISASSEMBLY 2-1. Rear Cover Removal 2-2. F6 and H8 Board Removal <= => => <= Clip Clips => <= Remove the rear cover fixing screws indicated and withdraw Release the clip circled and pull the F6 bracket towards the the rear cover from the beznet.

  • Page 14: Side Control Module Removal

    2-4. Side Control Module Removal 2-5. H2 Board Removal Screws Clips Remove the two screws fixing the user control module to the To remove the H2 board release the two clips circled and ease side of the set. The control module can then be removed by the board gently away from the support bracket.

  • Page 15: Picture Tube Removal

    2-8. Picture Tube Removal WARNING: BEFORE REMOVING THE ANODE CAP High voltage remains in the CRT even after the power is disconnected. To avoid electric shock, discharge CRT before attempting to remove the anode cap. Short between anode and CRT coated earth ground strap.
  • Page 16 - 16 -...

  • Page 17: Set-Up Adjustments

    SECTION 3 SET-UP ADJUSTMENTS • Carry out the adjustments in the following order : When complete readjustment is necessary or a new picture 3-1. Beam Landing. tube is installed, carry out the following adjustments. 3-2. Convergence. • Unless there are specific instructions to the contrary, carry 3-3.

  • Page 18: Convergence

    If the V.STAT magnet is moved in the direction of the (a) 3-2. Convergence and (b) arrows, the Red, Green and Blue points move as indicated below. Preparation: • Before starting this adjustment, adjust the focus, horizontal size and vertical size. •...
  • Page 19 Geometry Adjustment. YCH Adjustment Preparation: YCH VR Before starting this adjustment, adjust the horizontal and Deflection Yoke vertical static convergence. Remove the deflection yoke spacer. Tilt the deflection yoke as indicated in the figure below and TLV Adjustment optimise the geometry. Tilting the DY Up and Down will balance the upper and lower pin adjustment.

  • Page 20: Focus Adjustment

    Layout of each control 3-4. Screen (G2), White Balance [Adjustment in the service mode using the remote commander] G2 adjustment Input a dot signal from the pattern generator. Enter the ‘Service Mode’ by pressing ‘TEST’, ‘TEST’ and ‘38’ (TT-38) on the remote commander, to set up the G2 V.STAT service adjustment mode.

  • Page 21: Circuit Adjustments

    SECTION 4 CIRCUIT ADJUSTMENTS 4-1. Electrical Adjustments Service adjustments to this model can be performed using the supplied remote Commander RM-887. How to enter into the Service Mode Turn on the main power switch and enter into the stand-by mode. Press the following sequence of buttons on the Remote Commander.
  • Page 22 Sub Colour Adjustment Deflection System Adjustment Enter into the ‘Geometry’ service menu. Receive a PAL colour bar signal. Select and adjust each item in order to obtain the optimum image. Connect an oscilloscope to Pin 3 of CN003 [A Board]. Enter into the ‘Service’...

  • Page 23: Test Mode 1

    4-2. TEST MODE 1: Test Mode 1 is available by pressing the ‘TEST’ button once, OSD ‘T’ appears. The functions described below are available by selecting the indicated keys. The ‘T’ is released automatically after each command is executed. y t i s i l i n i i n i...
  • Page 24 Memo - 24 -...
  • Page 25 5-1. BLOCK DIAGRAMS (1) IC604 PH601 DUAL DC REGULATOR ISOLATOR CN606 LOWB CN1202 TO F6 BOARD MAIN RECT IC001 D601 CN7601 WOOFER MICRO, VIDEO PROCESSOR, RELAY ROM, AUDIO, VIDEO SWITCH RY601 CN001 CN1201 XTAL IN R AUDIO CN603 TO SPEAKERS XTAL OUT L AUDIO CHECK...
  • Page 26 5-1. BLOCK DIAGRAMS (2) CN2801 CN703 TO D2 BOARD SWITCH SWITCH R IN CN8801 CN8802 Q2801 RY2801 DY ASSY HDY- CN2802 G IN PICTURE TUBE SMART CORR H- DY+ H-DY+ TO A BOARD B IN CN003 H- DY- H-DY+ H DY H-DY- IC701 TO A BOARD...
  • Page 29 ~ A Board Schematic Diagram [ Power Supply, Deflection, Small Signal Board, Audio Amp ] page 1/2 ~ - 29 -...
  • Page 30 ~ A Board Schematic Diagram [ Power Supply, Deflection, Small Signal Board, Audio Amp ] page 2/2 ~ - 30 -...
  • Page 31 ~ A Board Semiconductor Location Table ~ NOTE: Portions of the circuit marked as shown are high voltage areas. Use care to prevent electric shock during inspection or repair. ~ A Printed Wiring Board Conductor side ~ - 31 -...
  • Page 32 ~ C Board Semiconductor Voltages ~ ~ C Board IC Voltages ~ ~ C Board Waveforms ~ 20us/div 20us/div 2.32 Vp-p (H) 2.32 Vp-p (H) 20us/div 20us/div C..-28EW20 CN704 COMPONENTS MARKED AS XX ARE NOT FITTED ON THIS MODEL 2.32 Vp-p (H) 116 Vp-p (H) R728 R,G,B OUT...
  • Page 33 ~ F6 Printed Wiring Board Conductor side ~ ~ D2 Printed Wiring Board Conductor side ~ ~ C Printed Wiring Board Conductor side ~ ~ VM Printed Wiring Board Conductor side ~ - 33 -...
  • Page 34 VM..-28EW20 R1955 R1954 D1909 330k 220k 1SS133 CHIP CHIP DYNAMIC FOCUS AND DQP C1952 C1953 0.0033 R1956 C1951 R1953 8.2k 270k 1/10W CHIP R1968 R1957 C1957 R1965 IC1902 R1966 LM358N CHIP CHIP CN1718 R1960 CN1701 Q1906 Q.P.- 2SC2412K-R R1964 C1955 MAGENTA C1845 Q.P.-...
  • Page 35 D3..-28EW20 Q2802 2SC2785-HFE R2801 2.2k CN2801 4:3 SWITCHING 1/4W R2802 H8..-28EW20 2.2k TO D2 BOARD 1/4W CN8802 IC7150 TSOP1740KS1 LED AND SIRCS RESPONSE C2802 CN2802 C7150 H-DY+ H-DY+ CN7150 H-DY- R7151 R7150 D7151 H-DY- 1/10W 1/10W CHIP CHIP V-DY- D7152 V-DY+ STBY +5V RD5.6ESB2...
  • Page 36 ~ H2 Printed Wiring Board Conductor side ~ ~ F3 Printed Wiring Board Conductor side ~ ~ D3 Printed Wiring Board Conductor side ~ ~ H8 Printed Wiring Board Conductor side ~ - 36 -...
  • Page 37 5-4. SEMICONDUCTORS IRF614-005 TDA9394H LM358N IRF614-037 LM393DT IRF620 LM393N M5216P TDA2822M TEA2124 ( TOP VIEW ) ( MARKING SIDE VIEW ) 2SA933AS-QT 2SAG33ASQT 2SA933AS-RT 2SC1740S-RT TOP209P MSP3411G-PP-B9 2SC2785-HFE LETTER SIDE ( TOP VIEW ) BF421-AMMO SE-135N 2SC2785-HFE 2SA1091-O SE135N-LF4 3 GND DTA144ESA 2SK2518-01MR DTA144ESA...
  • Page 38 ERA38-06 MTZJ-T-72-10B AK04-V1 ERD28-06S ERA81-004TP1 MTZJ-T-77-15B AU-01Z-V1 ERC06-15S ERA83-006 MTZJ-T-77-33A BYD33G FMN-G12S MTZJ-3.6A MTZJ-33C BYD33G-AMMO GP08D MTZJ-T-77-2.2A MTZJ-7.5B DINL20-TA RGP10GPKG23 HZS9.1NB2 P6KE200ASY D1NL20U RG15GPKG23 MTZJ-T-77-3.6B RD3.6ES-B2 DINL40-TA2 RG1CLF-B1 MTZJ-4.7C RD3.9ES-B2 ERB44-06TP1 RU-3AM MTZJ-T-77-5.1B RD5.1ESB2 EGP20G RU3YX-LF-C4 MTZJ-T-77-5.6B RD5.6ESB2 EG-1Z-V1 RU3YX-V1 MTZJ-T-77-6.8A RD6.8ES-B2 EL1Z...

  • Page 39: Ic Block Diagrams

    5-5 IC BLOCK DIAGRAMS A BOARD IC501 STV9379 A BOARD IC401/IC531 LM393DT FLYBACK GENERATOR POWER AMPLIFIER THERMAL PROTECTION A BOARD IC601 MCZ3001D Remote DVLD Internal Driver Sel=34v ref 5v Reg. 10v 15v/8v Level Shift Vsense Control Logic Latch Centre Timer A BOARD IC1201 TDA7495S VOLUME OP AMP...

  • Page 40: Exploded Views

    *A-1642-285-A D2 BOARD, COMPLETE 1-693-555-14 FRONTEND (TUNER+IF) (KV-28EW20B) 1-693-556-14 FRONTEND (TUNER+IF) (KV-28EW20E) 1-693-557-14 FRONTEND (TUNER+IF) (KV-28EW20U) *A-1300-897-A A BOARD, COMPLETE (KV-28EW20B) *A-1300-896-A A BOARD, COMPLETE (KV-28EW20E) *A-1300-952-A A BOARD, COMPLETE (KV-28EW20U) 4-039-358-01 SCREW (4x16), (+) BV TAPPING 1-529-408-11 SPEAKER (4.2x24CM)

  • Page 41: Picture Tube

    6-2. PICTURE TUBE REF.NO. PART.NO DESCRIPTION REMARK REF.NO. PART.NO DESCRIPTION REMARK *X-4040-352-2 BEZNET ASSY 52-55 *A-1638-156-A C BOARD, COMPLETE *4-205-701-41 BEZNET 4-200-433-01 SPRING, EXTENSION 4-205-699-03 POWER BUTTON £ 1-416-466-21 COIL, DEMAGNETIC 4-202-964-11 SPRING *4-203-390-71 CUSHION, DGC 4-205-698-02 GUIDE, LIGHT *4-057-303-01 HOLDER, DGC *X-4040-409-3 DOOR ASSY 57-60 *4-202-693-01 HOLDER, HV CABLE...

  • Page 42: Electrical Parts List

    A BOARD COMMON Parts List : Parts common to all models listed in this manual ..43 A BOARD VARIANT Parts List : Parts that belong only to the model specified Model KV-28EW20B ..................50 KV-28EW20E ..................50 KV-28EW20U ..................50 F3 BOARD COMPLETE Parts List : ..................
  • Page 43 REF.NO. PART.NO DESCRIPTION REMARK C112 1-162-970-11 CERAMIC CHIP 0.01UF 10.00% 25V * A-1300-897-A A Board, Complete (KV-28EW20B) * A-1300-896-A A Board, Complete (KV-28EW20E) C204 1-115-340-11 CERAMIC CHIP 0.22UF 10.00% 25V * A-1300-952-A A Board, Complete (KV-28EW20U) C211 1-162-970-11 CERAMIC CHIP 0.01UF 10.00% 25V...
  • Page 44 REF.NO. PART.NO DESCRIPTION REMARK REF.NO. PART.NO DESCRIPTION REMARK C430 1-102-114-00 CERAMIC 470PF 10.00% 50V C603 £ 1-119-899-51 CERAMIC 1000PF 10.00% 250V C435 1-163-017-00 CERAMIC CHIP 0.0047UF 10.00% 50V C604 £ 1-119-899-51 CERAMIC 1000PF 10.00% 250V C436 1-163-017-00 CERAMIC CHIP 0.0047UF 10.00% 50V C605 1-115-785-11 ELECT...
  • Page 45 B1 A REF.NO. PART.NO DESCRIPTION REMARK REF.NO. PART.NO DESCRIPTION REMARK C1211 1-163-033-91 CERAMIC CHIP 0.022UF D021 8-719-978-33 DIODE DTZ-TT11-6.8B C1213 1-164-346-11 CERAMIC CHIP 1UF D022 8-719-069-55 DIODE UDZSTE-175.6B C1215 1-126-952-11 ELECT 1000UF 20.00% 35V D035 8-719-069-55 DIODE UDZSTE-175.6B C1218 1-109-982-11 CERAMIC CHIP 1UF 10.00% 10V D036 8-719-069-55 DIODE UDZSTE-175.6B...
  • Page 46 F4 D REF.NO. PART.NO DESCRIPTION REMARK REF.NO. PART.NO DESCRIPTION REMARK D535 8-719-908-03 DIODE GP08D < IC > D536 8-719-945-80 DIODE ERC06-15S D537 8-719-070-62 DIODE PDZ9.1B-115 IC001 6-702-097-01 IC TDA9394H/N1/5/0583 D538 8-719-908-03 DIODE GP08D IC004 8-759-575-72 IC M24C08-WMN6T D539 8-719-312-10 DIODE RU4AM-T3 IC201 6-700-410-01 IC MSP3410G-PP-B8 IC401...
  • Page 47 REF.NO. PART.NO DESCRIPTION REMARK REF.NO. PART.NO DESCRIPTION REMARK L534 1-216-025-11 RES-CHIP 1/10W JR16 1-216-296-11 SHORT CHIP L535 1-459-111-00 INDUCTOR 10MH JR17 1-216-295-91 SHORT CHIP L601 1-408-603-31 INDUCTOR 10UH JR21 1-216-818-11 METAL CHIP 1/10W L602 1-408-611-31 INDUCTOR 47UH JR24 1-216-295-91 SHORT CHIP L603 1-412-523-41 INDUCTOR 6.8UH...
  • Page 48 REF.NO. PART.NO DESCRIPTION REMARK REF.NO. PART.NO DESCRIPTION REMARK R033 1-216-073-91 RES-CHIP 1/10W R220 1-216-017-91 RES-CHIP 1/10W R034 1-216-129-00 RES-CHIP 2.2M 5% 1/10W R221 1-216-190-00 RES-CHIP 1/8W R035 1-216-101-00 RES-CHIP 150K 5% 1/10W R232 1-216-025-11 RES-CHIP 1/10W R036 1-216-083-00 RES-CHIP 1/10W R233 1-216-069-00 RES-CHIP 6.8K 5%...
  • Page 49 REF.NO. PART.NO DESCRIPTION REMARK REF.NO. PART.NO DESCRIPTION REMARK R438 1-216-022-00 RES-CHIP 1/10W R533 1-216-077-91 RES-CHIP 1/10W R440 1-216-049-11 RES-CHIP 1/10W R534 1-216-097-11 RES-CHIP 100K 5% 1/10W R441 1-216-051-00 RES-CHIP 1.2K 5% 1/10W R535 1-216-099-00 RES-CHIP 120K 5% 1/10W R442 1-216-085-91 RES-CHIP 1/10W R538 1-535-143-71 LEAD, JUMPER (7.5MM)
  • Page 50 1/10W X201 1-760-628-11 VIBRATOR, CRYSTAL R648 1-215-481-00 METAL 330K 1% 1/4W R649 1-208-805-11 METAL CHIP 9.1K 0.5% 1/10W A Board Variant Parts KV-28EW20B R650 1-208-758-11 METAL CHIP 0.5% 1/10W < TUNER > R651 £ 1-220-926-11 FUSIBLE 0.47 10% 1/2W TU101...
  • Page 51 REF.NO. PART.NO DESCRIPTION REMARK REF.NO. PART.NO DESCRIPTION REMARK < RESISTOR > D707 8-719-901-83 DIODE 1SS83 D708 8-719-109-97 DIODE RD6.8ESB2 R3601 £ 1-202-719-00 SOLID 1/2W D709 8-719-109-97 DIODE RD6.8ESB2 D710 8-719-109-97 DIODE RD6.8ESB2 < TRANSFORMER > D1801 8-719-110-17 DIODE RD10ESB2 T3602 £ 1-433-488-11 TRANSFORMER, LINE FILTER D1802 8-719-110-17 DIODE RD10ESB2 D1803...
  • Page 52 D3 D2 REF.NO. PART.NO DESCRIPTION REMARK REF.NO. PART.NO DESCRIPTION REMARK < CONNECTOR > < TRANSISTOR > CN2801 *1-564-506-11 PLUG, CONNECTOR 3P Q8801 8-729-034-09 TRANSISTOR 2SK2518-01MR CN2802 *1-785-270-12 PIN, DY CONNECTOR (PC BOARD) Q8802 1-801-806-11 TR DTC144EKA CN2803 *1-580-798-11 CONNECTOR PIN (DY) 6P Q8803 1-801-806-11 TR DTC144EKA <...
  • Page 53 REF.NO. PART.NO DESCRIPTION REMARK REF.NO. PART.NO DESCRIPTION REMARK D1901 8-719-991-33 DIODE 1SS133T-77 R1912 1-216-857-11 METAL CHIP 1/10W D1902 8-719-991-33 DIODE 1SS133T-77 R1913 1-216-821-11 METAL CHIP 1/10W D1903 8-719-991-33 DIODE 1SS133T-77 R1914 1-216-825-11 METAL CHIP 2.2K 5% 1/10W D1904 8-719-991-33 DIODE 1SS133T-77 R1915 1-216-829-11 METAL CHIP 4.7K 5%...
  • Page 54 REF.NO. PART.NO DESCRIPTION REMARK REF.NO. PART.NO DESCRIPTION REMARK D903 8-719-929-15 DIODE HZS9.1NB2 < IC > D904 8-719-109-97 DIODE RD6.8ESB2 D905 8-719-109-97 DIODE RD6.8ESB2 IC7150 8-749-014-59 IC TSOP1740KS1 D908 8-719-923-60 DIODE MTZJ-T-77-9.1A < TRANSISTOR > < SOCKET > Q7150 8-729-027-38 TRANSISTOR DTA144EKA-T146 J900 1-750-264-11 JACK Q7151...
  • Page 55 PART.NO DESCRIPTION REMARK MISCELLANEOUS £ 1-571-433-21 SWITCH, PUSH (AC POWER) £ 1-765-286-11 CORD, POWER (KV-28EW20B/28EW20E) £ 1-776-204-11 CORD, POWER (KV-28EW20U) 1-424-733-11 COIL, PFC CHOKE 65MMH £ 1-453-308-21 TRANSFORMER ASSY, FLYBACK (NX-4521//Z2B4) 1-693-555-14 FRONTEND (TUNER+IF) (KV-28EW20B) 1-693-556-14 FRONTEND (TUNER+IF) (KV-28EW20E) 1-693-557-14 FRONTEND (TUNER+IF) (KV-28EW20U) 1-529-408-11 SPEAKER (4.2x24CM)
  • Page 56 • User programmable Functional Check through Infrared • Fast and documented Test Mode setting of all Sony TV chassis Additional features such as Adjustments and Troubleshooting are available in chassis-dependent software modules. Please contact your local Sony Service organisation for the latest information.

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