SHARP 27SC26BQ Service Manual

27SC26BQ

SERVICE MANUAL

COLOR TELEVISION

Chassis No. GB-D7

MODEL

In the interests of user-safety (Required by safety regulations in some countries ) the set should be restored to its original condition and only parts identical to those specified should be used.

27SC26BQ

CONTENTS

Page

» ELECTRICAL SPECIFICATIONS .........................................................................................................1

» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2

» LOCATION OF USER'S CONTROL .....................................................................................................5

» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 6

» SERVICE ADJUSTMENT ................................................................................................................... 13

» CHASSIS LAYOUT .............................................................................................................................16

» BLOCK DIAGRAM ..............................................................................................................................17

» DESCRIPTION OF SCHEMATIC DIAGRAMS & WAVEFORMS........................................................ 18

» SCHEMATIC DIAGRAMS ................................................................................................................... 19

» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 26

» PARTS LIST ........................................................................................................................................ 31

» PACKING OF THE SET ...................................................................................................................... 40

ELECTRICAL SPECIFICATIONS

POWER INPUT ..................................................... 120V AC, 60 Hz

POWER RATING .................................................................. 110W

PICTURE SIZE ....................................... 2,193.5 cm2 (339sq inch)

CONVERGENCE ............................................................. Magnetic

SWEEP DEFLECTION .................................................... Magnetic

FOCUS ............................................... Hi-Bi-Potential Electrostatic

INTERMEDIATE FREQUENCIES

Picture IF Carrier Frequency ...... 45.75 MHz (Analog Terrestrial)

Sound IF Carrier Frequency ....... 41.25 MHz (Analog Terrestrial)

Color Sub-Carrier Frequency ..... 42.17 MHz (Analog Terrestrial)

IF Center Frequency ........................ 44 MHz (Digital Terrestrial)

(Nominal)

AUDIO POWER

OUTPUT RATING .............. 3.0W + 3.0W (at 10% distortion and

Dual CH Operate)

SPEAKER

SIZE .......................................................... 12 x 6 cm oval (2 pcs.)

VOICE COIL IMPEDANCE............................. 16 ohm at 400 Hz

ANTENNA INPUT IMPEDANCE

VHF/UHF ..................................................... 75 ohm Unbalanced

TUNING RANGES

VHF-Channels ............................................................... 2 thru 13

UHF-Channels ............................................................14 thru 69

CATV Channels ............................................ 1 thru 125 (Analog)

CATV Channels ............................................. 1 thru 135 (Digital)

Digital Terrestrial Broadcast (VHF/UHF) ....................... 2 thru 69

(EIA, Channel Plan U.S.A.)

Specifications are subject to change without prior notice.

This document has been published to be used for after sales service only. The contents are subject to change without notice.

27SC26BQ

IMPORTANT SERVICE SAFETY PRECAUTION

Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow:

WARNING

1. For continued safety, no modification of any circuit should be attempted.

2. Disconnect AC power before servicing.

3. Semiconductor heat sinks are potential shock hazards when the chassis is operating.

4. The chassis in this receiver has two ground systems which are separated by insulating material. The nonisolated (hot) ground system is for the B+ voltage regulator circuit. The isolated ground system is for the low B+ DC voltages and the secondary circuit of the high voltage transformer. To prevent electrical shock use an isolation transformer between the line cord and power receptacle, when servicing this chassis.

CAUTION: FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE

4A 125V

ONLY WITH SAME TYPE 4A125V FUSE.

SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE

When servicing the high voltage system, remove the static charge by connecting a 10k ohm resistor in series with an insulated wire (such as a test probe) between the picture tube ground and the anode lead. (AC line cord should be disconnected from AC outlet.)

1. Picture tube in this receiver employs integral implosion protection.

2. Replace with tube of the same type number for continued safety.

3. Do not lift picture tube by the neck.

4. Handle the picture tube only when wearing shatterproof goggles and after discharging the high voltage anode completely.

X-RADIATION AND HIGH VOLTAGE LIMITS

1. Be sure all service personnel are aware of the procedures and instructions covering X-radiation. The only potential source of X-ray in current solid state TV receivers is the picture tube. However, the picture tube does not emit measurable X-Ray radiation, if the high voltage is as specified in the "High Voltage Check" instructions. It is only when high voltage is excessive that Xradiation is capable of penetrating the shell of the picture tube including the lead in the glass material. The important precaution is to keep the high voltage below the maximum level specified.

2. It is essential that servicemen have available at all times an accurate high voltage meter. The calibration of this meter should be checked periodically.

3. High voltage should always be kept at the rated value

-no higher. Operation at higher voltages may cause a failure of the picture tube or high voltage circuitry and;also, under certain conditions, may produce radiation in exceeding of desirable levels.

4. When the high voltage regulator is operating properly there is no possibility of an X-radiation problem. Every time a color chassis is serviced, the brightness should be tested while monitoring the high voltage with a meter to be certain that the high voltage does not exceed the specified value and that it is regulating correctly.

5. Do not use a picture tube other than that specified or make unrecommended circuit modifications to the high voltage circuitry.

6. When trouble shooting and taking test measurements on a receiver with excessive high voltage, avoid being unnecessarily close to the receiver. Do not operate the receiver longer than is necessary to locate the cause of excessive voltage.

IMPORTANT SERVICE SAFETY PRECAUTION

(Continued)

27SC26BQ

BEFORE RETURNING THE RECEIVER

(Fire & Shock Hazard)

Before returning the receiver to the user, perform the following safety checks.

1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the receiver.

2. Inspect all protective devices such as non-metallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacity networks, mechanical insulators, etc.

3. To be sure that no shock hazard exists, check for leakage current in the following manner.

• Plug the AC cord directly into a 120 volt AC outlet, (Do not use an isolation transformer for this test).

• Using two clip leads, connect a 1.5k ohm, 10 watt resistor paralleled by a 0.15µF capacitor in series with all exposed metal cabinet parts and a known earth ground, such as electrical conduit or electrical ground connected to earth ground.

• Use an AC voltmeter having with 5000 ohm per volt, or higher, sensitivity to measure the AC voltage drop across the resistor.

• Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor. AII checks must be repeated with the AC line cord plug connection reversed. (If necessary, a nonpolarized adapter plug must be used only for the purpose of completing these check.) Any current measured must not exceed 0.5 milliamp. Any measurements not within the limits outlined above indicate of a potential shock hazard and corrective action must be taken before returning the instrument to the customer.

1.5k ohm 10W

0.15µF

TEST PROBE

TO EXPOSED METAL PARTS

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121

CONNECT TO KNOWN EARTH GROUND

SAFETY NOTICE

Many electrical and mechanical parts in television receivers have special safety-related characteristics. These characteristics are often not evident from visual inspection, nor can protection afforded by them be necessarily increased by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual; electrical components having such features are identified by "å" and shaded areas in the Replacement Parts Lists and Schematic Diagrams.

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121

For continued protection, replacement parts must be identical to those used in the original circuit. The use of substitute replacement parts which do not have the same safety characteristics as the factory recommended replacement parts shown in this service manual, may create shock, fire, X-radiation or other hazards.

27SC26BQ

Precautions for using lead-free solder

1 Employing lead-free solder

"PWBs" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder.

Example:

L Fa

Indicates lead-free solder of tin, silver and copper.

2 Using lead-free wire solder

When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead wire solder may cause damage or accident due to cracks. As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40°C, we recommend you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or soldering bit, contact our service station or service branch in your area.

3 Soldering

As the melting point of lead-free solder (Sn-Ag-Cu) is about 220°C which is higher than the conventional lead solder by 40°C, and as it has poor solder wettability, you may be apt to keep the soldering bit in contact with the PWB for extended period of time. However, since the land may be peeled off or the maximum heat-resistance temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition. Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on and off the power of the bit as required. If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit after every use of it. When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.

Be careful when replacing parts with polarity indication on the PWB silk.

Lead-free wire solder for servicing

Part No. ★ Description Code

ZHNDAi123250E J φ0.3mm 250g(1roll) BL

ZHNDAi126500E J φ0.6mm 500g(1roll) BK

ZHNDAi12801KE J φ1.0mm 1kg(1roll) BM

LOCATION OF USER'S CONTROL

Front Panel

POWER

Press → On. Press again → Off.

REMOTE CONTROL SENSOR

Press → Accesses MAIN MENU. Press again → Exits MAIN MENU.

Basic Remote Control Functions

VOLUME UP/DOWN

(k) Increases sound. (l) Decreases sound.

CHANNEL UP/DOWN

(a) Selects next higher channel. (s) Selects next lower channel.

VIDEO/AUDIO IN 2 TERMINALS

27SC26BQ

POWER

Press → On. Press again → Off.

DISPLAY

To display receiving channel information.

MUTE

Press → Mutes sound. Press again → Restores sound.

REMOTE KEYPAD (0 – 9)

Sets the channel.

(DOT)

•

Sets the channel.

PERSONAL PREFERENCE

With the Personal Preference buttons, you can program your favorite programs by using the 4 categories A, B, C and D. The channels can be accessed quickly by using these buttons.

EDIT

To enter Personal Preference setting screen/to exit from Personal Preference setting screen.

Switches between Closed Caption service type.

/b/c/

Press to select a desired item on the screen or adjust a selected item.

RETURN

Returns to the previous screen.

Infrared Transmitter Window

INPUT

Press → Switches to external video INPUT 1 mode. Press twice → Switches to external video INPUT 2 mode. Press 3 times → Switches to external video INPUT 3 mode or COMPONENT mode. Press 4 times → Switches back to the original TV mode.

VOLUME UP/DOWN

(VOL k) Increases sound. (VOL l) Decreases sound.

CHANNEL UP/DOWN

(CH

) Selects next higher channel.

(CH

) Selects next lower channel.

ENTER

Sets the channel.

FLASHBACK

Returns to previous channel.

SCREEN FORMAT

Switches between Screen Format mode.

AUDIO

Switches between the audio service type.

GUIDE

Display the programme list.

Press → Accesses MAIN MENU. Press again → Exits MAIN MENU.

Note:

• The TV set and remote control illustrations and the on-screen displays in this manual may differ from their actual appearance.

27SC26BQ

INSTALLATION AND SERVICE INSTRUCTIONS

Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic

screwdrivers or TV alignment tools.

(2) Before performing adjustments, the TV set must be on at least 15 minutes.

CIRCUIT PROTECTION

The receiver is protected by a 4.0A fuse (F701), mounted on PWB-A, wired into one side of the AC line input.

X-RADIATION PROTECTOR CIRCUIT TEST

After service has been performed on the horizontal deflection system, high voltage system, B+ system, test the X-Radiation protection circuit to ascertain proper operation as follows:

1. Apply 120V AC using a variac transformer for accurate input voltage.

2. Allow for warm up and adjust all customer controls for normal picture and sound.

3. Receive a good local channel.

4. Connect a digital voltmeter to TP651-3 (P651 Pin3) and make sure that the voltmeter reads 13.50 ±0.6V DC.

5. Apply external 17.2V DC at TP651-3 by using an external DC supply, TV must be shut off.

6. To reset the protector, unplug the AC cord (about 1min.) and plug the AC cord power on. Now make sure that normal picture appears on the screen.

7. If the operation of the horizontal oscillator does not stop in step 5, the circuit must be repaired before the set is returned to the customer.

HIGH VOLTAGE CHECK

High voltage is not adjustable but must be checked to verify that the receiver is operating within safe and efficient design limitations as specified checks should be as follows:

1. Connect an accurate high voltage meter between ground and anode of picture tube.

2. Operate receiver for at least 15 minutes at 120V AC line voltage, with a strong air signal or a properly tuned in test signal.

3. Enter the service mode and select the service adjustment "V95" and Bus data "02" (Y-mute on, CRT Cut Off).

4. The voltage should be below 30.5kV (at zero beam). If a correct reading cannot be obtained, check circuitry for malfunctioning components. After the voltage test, make Y-mute off to the normal mode.

27SC26BQ

For adjustments of this model, the bus data is converted to various analog signals by the D/A converter circuit.

Note: There are still a few analog adjustments in this series such as focus and master screen voltage.

Follow the steps below whenever the service adjustment is required. See "Table-B" to determine, if service adjustments are required.

1. Service mode

Before putting unit into the service mode, check that customer adjustments are in the normal mode. Use the reset function in the video adjustment menu to ensure customer controls are in their proper (reset) position.

2. Service number selection

Once in the service mode, press the Ch-up or Chdown button on the remote controller or at the set. The service adjustment number will vary in increments of one, from "D01" to "M07". Select the item you wish to adjust.

3. Data number selection

Press the Vol-up or Vol-down button to adjust the data number.

To enter the service mode and exit service mode.

To enter the service mode manually just press and hold the Vol-down and Ch-up buttons at the same time, plug the AC cord into a wall socket. Now the TV set is switched on and enters the service mode. To exit the service mode, turn the television off by pressing the power button.

DATA NUMBER

SERVICE ADJUSTMENT NUMBER

V05

CHANNEL

111

4. Donau and Main Micon version Check

1. After television power on, press test key “0x31” and the following screen will display.

VERSION NUMBER

ANALOG : 1.00-2-R2

DIGITAL : 1.00

* ANALOG – Main Micon IC (RH-IXB945WJQZQ)

Software Version

1.00 - 2 - R2

Main Micon Version

EEPROM Version Number

* DIGITAL – Renesas IC (Inside Tuner) Software

Version

2. The version display screen will disappear after 30 second or pressing any key (except test key) will cancel the version display.

3. Alternatively for analog version only, go to service mode. Press menu key/button until "INFO" page appears in OSD. Version will display at bottom right corner. Explanation as below

MASK

: 0S SOFT : (Main micon software ver.) CHK1 : (ROM1 correct) CHK2 : (ROM2 correct)

Number of ROM Correct

Figure A.

INFO 12

MASK: 0S SOFT: V1.00 CHK1: ACT CHK2: ACT

Figure B.

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27SC26BQ

A. Deflection

4:3-Def-Adj16:9-Def-Adj

no. Item. DATA REG Range Remark Revision / Change

D01 V-SHIFT FIX

D02 H-SHIFT ADJ

D03 V-POS-4:3 ADJ m-con 0 … 255 V-PHASE.DTV

D04 V-SIZE-4:3 ADJ

D05 H-SIZE-4:3 ADJ

D06

D07

D08

D09

D10

D11 V-SHIFT-16:9 FIX

D12 H-SHIFT-16:9 ADJ

D13 V-POS-16:9 ADJ m-con 0 … 255 V-PHASE.DTV

D14 V-SIZE-16:9 ADJ

D15 H-SIZE-16:9 ADJ

D16

D17

D18

D19

D20

D21

D22

D23 AFC1-IF FIX

D24 AFC2 FIX

D25 V-FREE FIX

D26 H-FREE FIX

D27 HV-FREE FIX

D28 1W-TV FIX

D29 1W-AV-SAV FIX

D30 1W-YUV-DTV FIX

D31 SL-TV FIX

D32 SL-AV FIX

D33 SL-SAV FIX

D34 SL-YUV FIX

D35 SL-DTV FIX

D36 VD-DYTV FIX

D37 VD-AV FIX

D38 AS-TV FIX

D39 AS-AV FIX

VS-CORRECT

-4:3

V-LINEARITY

-4:3

E/W PARABOLA

-4:3

E/W TRAPEZIUM

-4:3

E/W CORNER

-4:3

VS-CORRECT

-16:9

V-LINEARITY

-16:9

E/W PARABOLA

-16:9

E/W TRAPEZIUM

-16:9

E/W CORNER

-16:9

V-BLK-TOP

-16:9

V-BLK-BOTTOM

-16:9

FIX

ADJ

FIX

ADJ

FIX

ADJ

FIX

ADJ

FIX

V-SHIFT

13h D2…D0

H-PHASE

16h D4…D0

V-SIZE

11h D5…D0

H-SIZE

1Bh D5…D0

VS CORRECTION

[19h D5…D0] V-LINEARITY

[1Dh D5…D0]

E/W PARABOLA

[18h D5…D0]

E/W TRAPEZIUM

[1Ah D5…D0]

E/W CORNER

[1Ch D5…D0]

V-SHIFT

[13h D2 ..D0]

H-PHASE

[16h D4 ..D0]

V-SIZE

11h D5…D0

H-SIZE

1Bh D5…D0

V S CORRECTION

19h D5…D0

V-LINEARITY

1Dh D5…D0

E/W PARABOLA

18h D5…D0

E/W TRAPEZIUM

1Ah D5…D0

E/W CORNER

1Ch D5…D0

Vert. Blanking Top

2Ch D3…D2

Vert. Blanking Bottom

2Ch D1…D0

AFC1 Gain

27h D6

AFC2-G

15h D6

V-FREE

10h D6

H-FREE

13h D7

HV-FREE

25h D5

V.Window

13h D6

V.Window

13h D6

V.Window

13h D6

S-SLICE DN

14h D3…D2] [24h D6

S-SLICE DN

14h D3…D2] [24h D6

S-SLICE DN

14h D3…D2] [24h D6

S-SLICE DN

14h D3…D2] [24h D6

S-SLICE DN

14h D3…D2] [24h D6

Vsync-Det

27h D3] [16h D7

Vsync-Det

27h D3] [16h D7

Auto-Slice

16h D6

Auto-Slice

16h D6

0 … 7 0

0 … 31 H-PHASE.DTV

0 … 63 V-SIZE.DTV

0 … 63 H-SIZE.DTV

0 … 63 28

0 … 63

0 … 63 27

0 … 63

0 … 7 0

0 … 31 H-PHASE.DTV

0 … 63 V-SIZE.DTV

0 … 63 H-SIZE.DTV

0 … 63 38

0 … 63

0 … 63 27

0 … 63

0 … 3 2

0 / 1 0

0 / 1 1

0 / 1 0

0 … 7 5

0 … 3 0

0 / 1 1

V-

LINEARITY.DTV

E/W

PARABOLA.DTV

E/W

CORNER.DTV

V-

LINEARITY.DTV

E/W

PARABOLA.DTV

E/W

CORNER.DTV

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27SC26BQ

B. Video

TV-Picture-AdjYUV-Picture-AdjDTV-Picture-Adj

TV-Picture-Adj

YUV-Picture-Adj

DTV-Picture-Adj

no. Item. DATA REG Range Remark Revision / Change

D40 AS-SAV FIX

D41 AS-YUV FIX

D42 AS-DTV FIX

D43 FBP-TV FIX

D44 AS-SPEED-UP FIX

D45 AS-SPEED-DN FIX

no. Item. DATA REG Range Remark Revision / Change

V01 SUB-CON ADJ

V02 SUB-TINT ADJ

V03 SUB-COL ADJ

V04 SUB-BRI ADJ

V05 SUB-SHP FIX

V06 R-CUT ADJ

V07 G-CUT ADJ

V08 B-CUT ADJ

V09 R-DRI ADJ

V10 B-DRI ADJ

V11 SUB-CON-YUV ADJ

V12 SUB-BB-TINT-YUV ADJ

V13 SUB-COL-YUV ADJ

V14 SUB-BRI-YUV ADJ

V15 SUB-SHP-YUV FIX

V16 R-CUT-YUV ADJ

V17 G-CUT-YUV ADJ

V18 B-CUT-YUV ADJ

V19 R-DRI-YUV ADJ

V20 B-DRI-YUV ADJ

V21 SUB-CON-DTV ADJ

V22 SUB-BB-TINT-DTV ADJ

V23 SUB-COL-DTV ADJ

V24 SUB-BRI-DTV ADJ

V25 SUB-SHP-DTV FIX

V26 R-CUT-DTV ADJ

V27 G-CUT-DTV ADJ

V28 B-CUT-DTV ADJ

V29 B-DRI-DTV ADJ

V30 R-DRI-DTV ADJ

Auto-Slice

16h D6

Auto-Slice

16h D6

Auto-Slice

16h D6

FBP VTH L

16h D5

AS SPEED UP

28h D4

AS SPEED DOWN

28h D5

CONTRAST [05h D6…D0]

TINT

07h D6…D0

COLOR

08h D6…D0

BRIGHT

0Ah D7…D0

VIDEO-TONE

04h D5…D0 R-CUTOFF

0Dh D7…D0

G-CUTOFF

0Eh D7…D0

B-CUTOFF

0Fh D7…D0

R-DRIVE

0Bh D6…D0

B-DRIVE

0Ch D6…D0

CONTRAST

05h D6..D0

BASEBAND-TINT

17h D6…D0

COLOR

08h D6…D0

BRIGHT

0Ah D7…D0

VIDEO-TONE

04h D5…D0 R-CUTOFF

0Dh D7…D0

G-CUTOFF

0Eh D7…D0

B-CUTOFF

0Fh D7…D0

R-DRIVE

0Bh D6…D0

B-DRIVE

0Ch D6…D0

CONTRAST

05h D6..D0

BASEBAND-TINT

17h D6…D0

COLOR

08h D6…D0

BRIGHT

0Ah D7…D0

VIDEO TONE

04h D5…D0 R-CUTOFF

0Dh D7…D0

G-CUTOFF

0Eh D7…D0

B-CUTOFF

0Fh D7…D0

B-DRIVE

0Ch D6…D0

R-DRIVE

0Bh D6…D0

0 / 1 1

0 / 1 0

0 … 127

0 … 255

0 … 63

0 … 255

0 … 127

0 … 127 0 … 127 0 … 127

0 … 127

0 … 255

0 … 63

0 … 255

0 … 127

0 … 127 0 … 127 0 … 127

0 … 127

0 … 255

0 … 127

COLOR.DTV

WHITE.DTV

COLOR.DTV

WHITE.DTV

COLOR.DTV

WHITE.DTV

PIC.DTV

TINT.DTV

PIC.DTV

TINT.DTV

PIC.DTV

TINT.DTV

PIC.DTV

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27SC26BQ

no. Item. DATA REG Range Remark Revision / Change

V31 SHPG-YUV FIX

V32 YDL-YUV FIX

V33 CrDL-FINE-YUV FIX

V34 CbDL-FINE-YUV FIX

ComponenetF-AV DTVTVCOLOR TEMPS-VIDEO

Componenet

DTV

COLOR TEMP

S-VIDEO

F-AV

V35 CB-P-YUV FIX

V36 CR-P-YUV FIX

V37 C-ANGLE-YUV FIX

V38 SHPG-DTV FIX

V39 YDL-DTV FIX

V40 CrDL-FINE-DTV FIX

V41 CbDL-FINE-DTV FIX

V42 CB-P-DTV FIX

V43 CR-P-DTV FIX

V44 C-ANGLE-DTV FIX

V45 SHPG-TV FIX

V46 YDL-TV-AV FIX

V47 TAKE-OFF-TV FIX

V48 C-ANGLE FIX

V49 R-R2 FIX

V50 R -R FI X

V51 R -B FIX

V52 B-R2 FIX

V53 B -R FIX

V54 B-B FIX

V55 BRIGHT-OFF-SAV FIX

V56 CON-OFF-SAV FIX

V57 TINT-OFF-SAV FIX

V58 COL-OFF-SAV FIX

V59 SHP-OFF-SAV FIX

V60 YDL-SAV FIX

V61 BRIGHT-OFF-FAV FIX

V62 CON-OFF-FAV FIX

V63 TINT-OFF-FAV FIX

V64 COL-OFF-FAV FIX

V65 SHP-OFF-FAV FIX

V-TONE

02h D3

Y-Delay

06h D2…D0

CrDL FINE ADJ.

21h D3…D2

CbDL FINE ADJ.

21h D1…D0

CB PEDESTAL ADJ.

29h D3…D0

CR PEDESTAL ADJ.

28h D3…D0

C.ANGLE 95

15h D1

V-TONE

02h D3

Y-Delay

06h D2…D0

CrDL FINE ADJ.

21h D3…D2

CbDL FINE ADJ.

21h D1…D0

CB PEDESTAL ADJ.

29h D3…D0

CR PEDESTAL ADJ.

28h D3…D0

C.ANGLE 95

15h D1

V-TONE

02h D3

Y-Delay

06h D2…D0

TAKE OFF

02h D0

C.ANGLE 95

15h D1

R-DRI(OFFSET)

0Bh D6…D0

R-DRI(OFFSET)

0Bh D6…D0

R-DRI(OFFSET)

0Bh D6…D0

B-DRI(OFFSET)

0Ch D6…D0

B-DRI(OFFSET)

0Ch D6…D0

B-DRI(OFFSET)

0Ch D6…D0

BRIGHT (OFFSET)

0Ah D7…D0

CONTRAST(OFFSET)

05h D6…D0

TINT(OFFSET)

07h D6…D0

COLOR(OFFSET)

08h D6…D0

VIDEO-TONE(OFFSET)

04h D6…D0

Y-Delay

06h D2…D0

BRIGHT(OFFSET)

0Ah D7…D0

CONTRAST(OFFSET)

05h D6…D0

TINT(OFFSET)

07h D6…D0

COLOR(OFFSET)

08h D6…D0

VIDEO-TONE(OFFSET)

04h D6…D0

0 / 1 1

0 … 7 1

0 … 3 0

0 … 15 7

0 / 1 0

0 / 1 1

0 … 7 1

0 … 3 0

0 … 15 7

0 / 1 0

0 / 1 1

0 … 7 5

0 / 1 0

-32 … +32 +13

-32 … +32 +2

-32 … +32 -6

-32 … +32 -23

-32 … +32 -8

-32 … +32 +5

-63 … +63 +7

-32 … +32 +11

-32 … +32 +1

-32 … +32 +5

-32 … +32 0

0 … 7 1

-63 … +63 -7

-32 … +32 +15

-32 … +32 +2

-32 … +32 +1

-32 … +32 0

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27SC26BQ

no. Item. DATA REG Range Remark Revision / Change

V66 BRIGHT-OFF-AV FIX

V67 CON-OFF-AV FIX

V68 TINT-OFF-AV FIX

V69 COL-OFF-AV FIX

V70 SHP-OFF-AV FIX

V71 TINT-OFF-ADJ-TV FIX

V72 CON-OFF-16:9 FIX

V73 BRI-OFF-16:9 FIX

RR-AV

V74 TRAP-FINE-TV-AV FIX

V75 TRAP-TV-AV FIX

V76 SHPG-AV FIX

V77 SHPG-SAV FIX

V78 COL-OFF-16:9 FIX

V79 TRAP-DTV-YUV FIX

V80 TAKE-OFF-AV FIX

V81 TAKE-OFF-SAV FIX

V82 RF-AGC ADJ

V83 VIF-AGC FIX

V84 VIF-G FIX

V85 V-AGC FIX

V86 VIF-VCO ADJ

V87 H-VCO ADJ

V88 BS FI X

V89 BS-GAIN FIX

V90 BS-D FIX

V91 BS-C FIX

V92 ABCL FIX

V93 ABCL-Gain FIX

V94 GAMMA FIX

V95 Y-MUTE FIX m-con 0,1,2 0

V96 CbCr-G FIX

V97 STP FIX

V98 RGB-CLIP FIX

V99 OSD-LVL FIX

V100 YLPF FIX

V101 C.Clip Level FIX

V102 S-TRAP FIX

V103 S-TRAP OFF FIX

V104 OM-DET FIX

BRIGHT(OFFSET)

0Ah D7…D0

CONTRAST(OFFSET)

05h D6…D0

TINT(OFFSET)

07h D6…D0

COLOR(OFFSET)

08h D6…D0

VIDEO-TONE(OFFSET)

04h D6…D0

TINT

07h D6..D0

CONTRAST(OFFSET)

05h D6…D0

BRIGHT(OFFSET)

0Ah D7…D0

TRAP-FINE 12h D1…D0

C-TRAP OFF

02h D4

V-TONE

02h D3

V-TONE

02h D3

COLOR(OFFSET)

08h D6…D0

C-TRAP OFF

02h D4

TAKE OFF

02h D0

TAKE OFF

02h D0

RF-Delay

00h D6…D0

VIF AGC Clip

27h D1

VIF-GAIN

06h D7…D5

V-AGC

1Dh D6

VIF-VCO

01h D5…D0

H-VCO

10h D2…D0

BS-OFF

BLACK STRETCH GAIN

02h D1

15h D2

BS-DISCHARGE

14h D7…D6

BS-CHARGE

14h D5…D4

ABCL

02h D2

ABCL-G

04h D7

GAMMA

12h D3…D2

CbCr GAIN UP

29h D6

Test Pattern Signal

2Fh D3…D0

ExtRGB-Clip

05h D7

OSD LEVEL

15h D5

YSW-LPF

13h D5

C.Clip Level

02h D5

S-TRAP

20h D7]

1Fh D7…D5

S-TRAP OFF

1Eh D7

OM DETECTOR

15h D3

-63 … +63

-32 … +32

-15 … +15

0…3

0 / 1 1

-15 … +15

0 / 1 1

0 / 1 0

0 … 127

0 / 1 0

0 … 7

0 / 1 0

0 … 63

0 … 7

0 / 1 0

0 … 3

0 / 1 0

0 … 3

0 / 1 1

0 … 15

0 / 1 0

0 … 31

0 / 1 1

0 / 1 0

-5

+15

-7

AGC.DTV

VIF-VCO.DTV

H-VCO.DTV

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27SC26BQ

no. Item. DATA REG Range Remark Revision / Change

V105 R-MTX-DN FIX

V106 C TI FIX

V107 KILLER-LVL FIX

V108 SIF-BW FIX

V109 E-SAVE FIX

V110 MONITORING FIX

V111 OFF-ADJ-TINT-YUV FIX

V112 OFF-ADJ-TINT-DTV FIX

V113 CC-POS ADJ m-con 0 … 255 CC.DTV V114 CC LEVEL FIX m-con 0 … 31 0 V115 OSD POS FIX m-con 0 … 31 0 V116 DIGITAL POW OFF TIM FIX m-con 0…255 50 V117 BSW CONTROL FIX m-con 0…100 85

V118 SVM-SAV FIX

V119 SVM-COMP FIX

V120 SVM-DTV FIX

V121 RGB ADJ FIX m-con 0…127 127

V122 ChromaBPF FIX

R MTX DOWN

23h D6

CTI

23h D3

KILLER LEVEL

15h D0

SIF BPF WIDE

2Bh D5…D4

CONTRAST(OFFSET)

05h D6…D0

Intelligent MON

1Ah D6][12h D7…D4

BB Tint Control

17h D6…D0

BB Tint Control

17h D6…D0

DELAY Y ADJ

22h D5…D4

DELAY Y ADJ

22h D5…D4

DELAY Y ADJ

22h D5…D4

ChromaBPF

26h D6

0 / 1 0

0 / 1 1

0 … 3 1

0 … 63 30

0 … 31 21

-32 … +32 0

0…3 0

C. Sound

no. Item. DATA REG Range Remark Revision / Change

M01 MTS-ATT ADJ

M02 MTS-VCO FIX

M03 MTS-FILT FIX

M04 MTS-WBND ADJ

M05 MTS-SPEC ADJ

M06 SUB-VOL FIX

M07 FAO-VOL FIX

D. Option

27SC—

O 01 SPEAKER 1 O 02 FAO 1 O 03 VIEW TIMER 1 O 04 PON-CH 1 O 05 FAV-COL 1 O 06 AV3/COMPONENT 1 O 07 AV 1 O 08 AV2 1 O 09 MT S 1 O 10 TONE-CTRL 1 O 11 AUTO-OFF 1 O 12 INIT-LANG 0 O 13 S-IN 1 O 14 COMB 0 O 15 AUTO-INPUT 1 O 16 FLAT 1 O 17 WHITE-OUT 0 O 18 CURSOR R/C 1 O 19 EDIT KEY R/C 1

Model

REMARKS/

REVISION

ATT

00h D3..D0

VCO

01h D5..D0

FILTER

02h D5..D0

WIDEBAND

04h D5..D0

SPECTRAL

03h D5..D0

VOL

07h,08h D5..D0

VOL

07h,08h D5..D0

0 … 15 MS.DTV

0 … 63 32

0 … 63 28

0 … 63 SEPA.DTV

0 … 63 63

0 … 50 26

27SC26BQ

Holding down both the VOL-up and CH-up buttons on the TV set at service mode for more than 2 seconds will automatically write the above initial values into IC2101.

PART REPLACED

IC801

IC2101

CRT

IC3001

NECESSARY UNNECESSARY

ADJUSTMENT

NOTES

The adjustment is needed to compensate for characteristics of parts including IC801 and MTS level (M01).

Holding down both the VOL-up and CH-up buttons on the TV set in the service mode for more than 2 seconds will automatically write the above initial values into IC2101 Then perform a complete adjustment.

Adjust items related to picture tube only.

Adjust items related to MTS only (M01~M07).

SERVICE ADJUSTMENT

H-VCO ADJ (I2C BUS CONTROL) (Auto & Manual Adj)

• Manual Adj.

1. In No Signal (RASTER) condition.

2. Go to service mode, choose service data V87.

3. Connect oscilloscope to IC801 Pin15, adjust V87 until frequency become 15.75±0.15kHz.

• Auto Adj.

4. In No Signal (RASTER) condition.

5. Go to service mode, choose service data V87, by pressing R/C Auto (HEX 44) key, OSD will appear "OK" at screen.

6. If appear "NG", please repeat step 3.

VIF-VCO ADJ (I2C BUS CONTROL) (Auto & Manual Adj)

• Manual Adj.

1. In No Signal (RASTER) condition.

2. Go to service mode, choose service data V86.

3. Connect oscilloscope to IC801 Pin9, adjust V86 until voltage between 2.5±1.0V.

• Auto Adj.

4. In No Signal (RASTER) condition.

5. Go to service mode, choose service data V86.

6. Press the R/C Auto (HEX C5) key, OSD will appear "OK" at screen.

7. If appear "NG", please repeat step 3.

Screen Adjustment

1. Receive a good local channel.

2. Enter the service mode and select the service adjustment "V03" and set the data value to "00" to set the color level to minimum. (Record original data code under adjustment "V03" before changing) You may skip this step, if you selected a B/W picture or monoscope pattern.

3. Select the service adjustment "V95" and adjust the data value to "02", this turn off the luminance signal (Y-mute).

4. Adjust the master screen control until the raster darkness to the point where raster is barely seen.

5. Adjust the service adjustments "V06" red, "V07" green and "V08" blue to obtain a good grey scale with normal whites at low brightness level.

6. Select the service adjustment "V95" and reset data to "00". Select the service adjustment "V03" and reset data to obtain normal color level.

7. For component input, the data value of "V16" red, "V17" green and "V18" blue is adjusted to follow the data value of "V06", "V07" and "V08" respectively.

8. For digital RF input, the data value of "V26" red, "V27" green and "V28" blue is adjusted to follow the data value of "V06", "V07" and "V08" respectively.

9. Reset the master screen control to obtain normal brightness range.

RF AGC Adjustment

1. Receive a good local channel.

2. Enter the service mode and select the service adjustment "V82".

3. Set the data value to point where no noise or beat appears.

4. Select another channel to confirm that no noise or beat appears. Note 1 : You will have to come out of the service

mode to select another channel.

Note 2 : Setting the data to "00" will produce a black

raster.

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