SHARP 21HS-50H Service Manual

21HS-50H

SERVICE MANUAL

SEBD21HS50H01

Issued: 24th October 2001

GA-1E CHASSIS

P AL I SYSTEM COLOUR TELEVISION

MODEL 21HS-50H

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

CONTENTS

ELECTRICAL SPECIFICATION.........................3

IMPORTANT SERVICING NOTES ...................4

CONTROLS & TERMINALS..............................5

SERVICE ADJUSTMENTS................................6

CHASSIS LA YOUT ...........................................12

LED FLASHING CODE....................................13

PRINTED WIRING BOARDS...........................13

ICs ADDITIONAL INFORMA TION...................18

SCHEMATIC DIAGRAM, WAVE FORMS........26

BLOCK DIAGRAM...........................................32

TROUBLESHOOTING T ABLES......................34

P ARTS LISTING.............................................37

SHARP CORPORATION

This document has been published to be used for after sales service only.

21HS-50H

SERVICE MANUAL UPDATE LOG SHEET

Technical Report No. Technical Bulletin No.

Cause / Solution

Part No.

Page No.

Application Data /Serial No.

Use this page to keep any special servicing information as Technical Report (Bulletin), T echnical Information, etc. If only part number changes are required, just change part number directly the part number in the Parts Listing Section. If you need more information, please refer to the Technical Report (Bulletin).

ELECTRICAL SPECIFICATIONS

21HS-50H

•Power Input .......................220V-240 Volts AC 50Hz

•Power Consumption

Normal Operation....................................43W

Stand-by Operation...................................3W

•Audio Power Output Rating ................4W x 2(MPO)

Speaker................................16

Convergence.........................Self Converging System

Focus....................................Bi-Potencial Electrostatic

Sweep Deflection...........................................Magnetic

•Picture Intermediate Frecuency..............38.9MHz

•White Level

Set the brightness control, with no signal connected, so that the CRT cathode current is 600mA. The maximum correction applied to each cathode current to achieve a screen temperature of 8900 degrees K-20 MPCD should

not exceed 15% of its original value.

Ω 4W, 9 x 5 cm,2pcs

•Sound Carrier Trap...............................32.9MHz

•Adjacent Sound Carrier Trap.................40.9MHz

•Adjacent Picture Carrier Trap...............30.9MHz

•Aerial Input Impedance

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

•Tuning Ranges ............45.75MHz thru 855.25 MHz

VHF.............IR A - J

S1-S41 (HYPERBAND)

UHF.............I21 - I69 CH

X Y Screen temperature

0.290 ± 0.015 0.284 ± 0.015 8900º K-20 MPCD

Specifications are subject to change without prior notice.

WARNING

The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and power receptacle, when servicing this chassis. To prevent electric shock, do not remove cover. No user-serviceable parts inside. Refer servicing to qualified service personnel.

21HS-50H

IMPORTANT SERVICING NOTES

Only qualified service personnel are allowed to carry out maintenance and repair of this receiver.

SERVICING OF HIGH VOLTAGE SYSTEM AND CRT

It is important that the static charge is removed from the high voltage system when carrying out work on the receiver. This can be achieved by connecting a 10K resistor (with a suitably insulated lead) from the CRT cavity connector to the CRT ground tag. This must be carried out with the AC supply disconnected from the receiver. Note the following:

• The CRT in this receiver employs Integral Implosion Protection.

• If the CRT has to be changed it MUST be replaced with the correct type for continued safe

working

• DO NOT lift the CR T b y its neck.

• When handing the CRT , ensure that shatterproof goggles are worn.

• Ensure that the CRT is discharge before handling.

X-RAY

This receiver is designed to keep any x-ray emission to an absolute minimum. Some fault conditions and servicing procedures may produce potentially hazardous x-ray radiation levels. This is a problem when in close proximity to the receiver for long periods of time. To reduce any risks associated with this, please observe the following precautions:

1. When undertaking any servicing on this chassis, DO NOT increase the EHT to more than 30.5 KV , (at a instantaneous beam current of 1300µΑ).

2. Ensure that during normal operation the EHT does not exceed 25.0 KV 1100µΑ). This level has been preset in the factory. Always check that this level has not been ex-

ceeded after carrying out any repair on the receiver.

3. DO NOT replace the CR T with any other type than that specified in the parts listing as this may cause excessive x-ray radiation.

±1.5KV (at a beam current of

BEFORE RETURNING THE RECEIVER TO THE CUSTOMER

In addition to the above checks, the following should also be carried out before returning the receiver to the customer.

1. Inspect all the leads to ensure that they are dressed correctly and that they are not obstructed or pinched by any other parts.

2. Ensure that all protective devices are in good condition. These will include nonmetallic control knobs, insulating fish papers, cabinets backs, compartment covers or shields, mechanical insulators, etc.

Location of Controls

21HS-50H

Remote Control

POWER/STANDBY ( ) button

Programme Select buttons

FLASHBACK ( ) button

VOLUME UP ( )/DOWN ( ) buttons

( ) Increases sound ( ) Decreases sound (These are also used for menu set up)

LIST Select button (Teletext)

CANCEL ( ) button (Teletext)

STORE ( ) button (Teletext)

HALF PAGE ( ) button (Teletext)

RESET ( ) button (Teletext)

CALL ( )/CHILD LOCK ( ) button

Returns to previously viewed programme

MENU button

VCRTV

123

456

7809

LIST

VCR

TV/ VCR/ TEXT REMOTE CONTROL

TV/VIDEO

GA006SA

Infrared Transmitter Window

Aim this window at the infrared sensor on your TV set

TV/VIDEO Select button

Single/Double Entry button ( )

COLOUR buttons

CHANNEL (PROGRAMME) UP ( )/ DOWN ( ) buttons

( ) Selects next higher programme ( ) Selects next lower programme (These are also used for menu set up)

TV button (Teletext) REVEAL ( ) button (Teletext) CLOCK ( ) button (Teletext) Sound Mode Select ( ) button HOLD ( ) button (Teletext)

SOUND MUTE ( ) button Text/Mix ( )

Select button (Teletext) INDEX ( ) button (Teletext)

TV Front

MENU CH

Power ( ) button

Power/On Timer indicator

Remote Control Sensor

Volume Up ( )/Down ( ) buttons

Menu button

Euro-SCART 21-Pin Terminal

For greater A/V enjoyment, various audio and video devices may be connected via the Euro-SCART 21-Pin Terminal.

1. Audio right output

2. Audio right input

3. Audio left output

4. Common earth for audio

5. Earth for blue

6. Audio left input

7. Blue input

8. Audio-video control

9. Earth for green

10. Not used

11. Green input

12. Not used

13. Earth for red

14. Not used

15. Red input

16. Red/Green/Blue

17. Earth for video

Audio: Stereo Input / Output.

Channel Up ( )/Down ( ) buttons

21-Pin Euro-

18. Earth for video

19. VIDEO output

control

20. VIDEO input

21. Common earth

21HS-50H

SERVICE ADJUSTMENT

• SERVICE MODE FUNCTION

All required adjustments for servicing this TV set, may be done in “service mode”, excepting G2 and FOCUS.

HOW TO ACCESS THE SERVICE MODE

1. Turn the receiver on and ensure that it is tuned into a test pattern.

2. Turn the receiver off using the mains switch.

3. Press the volume down and channel up buttons together. See Fig.1.

4. Continue pressing the volume down and channel up buttons while turning the mains on using the mains switch. See Fig.1.

Fig.1

5. Keep pressing the volume down and channel up buttons until the picture appears.

6. When <<SHARPX X VXX.XX>> appears on the screen, release the two buttons.

7. The receiver is now in the service mode. See Fig. 2.

To move between the various service mode functions, use the channel up and down buttons. See Fig. 3. Use the volume buttons to change the data to the desired value. See Fig. 3. The data will be stored automatically when exiting the service mode. To exit the service mode press the standby button

on the remote control or turn the receiver off with the mains switch.

SHARP X X VXX.XX

STS0: XXXX XXXX STS1: XXXX XXXX STS2: XXXX XXXX

Adjustment (Yellow)

Fig. 3Fig. 2

XXXX:

XX:

Value (Green)

21HS-50H

• SERVICE ADJUSTMENTS AND DATA LIST

The table below shows the various service mode positions, range of values and default value. The columns are headed as follows.

Heading: Description: OSD This is what will appear on the screen when at this position Function This is the description of the mode’s function Range This is the range of values that can be entered while in this mode Initial This is the initial value, i.e. just after changing the NVM Default This is the recommended default value for this mode FIX/ADJ If this is ADJ, then it may be necessary to adjust this value away from the default

No. OSD Function Range Initial Default FIX/ADJ

1 AGC AGC Take Over Point 0...63 14 14 ADJ 2 V-LIN Vertical Slope [VS] 0...63 32 32 ADJ 3 V-AMP V ertical Amplitude [VA] 0...63 32 32 ADJ 4 V-CENT Vertical Shift [VSH] 0...63 32 32 ADJ 5 H-CENT Horizontal shift [HS] 0...63 32 32 ADJ 6 H-CENT60 offset to H-CENT for60 Hz 0...31 data(-16..+15) 16 20 FIX 7 EW / / Horizontal Parallelogram [HP] 0...63 32 32 FIX 8 HB Horizontal Bow 0...63 32 32 FIX 9 S-COR S-Correction [SC] 0...63 0 22 FIX 10 DRI-RS White point Red Standard white temp. 0...63 32 42 ADJ 11 DRI-GS White point Green Standard white temp. 0...63 32 42 ADJ 12 DRI-BS White point Blue Standard white temp 0...63 32 42 ADJ 13 DRI-RW White point Red Warm white temp. 0...32 16 16 FIX 14 DRI-GW White point Green Warm white temp. 0...32 16 9 FIX 15 DRI-BW White point Blue Warm white temp. 0...32 16 9 FIX 16 DRI-RC White point Red Cold white temp. 0...32 16 9 FIX 17 DRI-GC White point Green Cold white temp. 0...32 16 9 FIX 18 DRI-BC White point Blue Cold white temp. 0...32 16 16 FIX 19 SUB-VOL Max Volume 0...63 60 60 FIX 20 SUB-CON Sub Contrast 0...63 63 63 FIX 21 SUB-COL Sub Colour 0...63 32 25 FIX 22 SUB-BRI Sub Brightness 0...63 32 34 FI X 23 TINT Sub Tint 0...63 32 32 FIX 24 SUB-SHP Sub Sharpness 0...63 32 11 FIX

21HS-50H

No. OSD Function Range Initial Default FIX/ADJ

25 HTL-VOL Max Hotel Volume 0...63 30 30 FIX 26 HTL-PRG Hotel Program number 0...99 or > 99 for none 255 255 FIX 27 RGB OSD RGB Reference 0...15 15 0 FIX 28 SEARCH-SYS Sound system for auto turning 0(L-BG),1(BG),2(I),3(DK) 1 2 FIX 29 CUT-R Black Level off-set R [BLR] 0...63 0 0 FIX 30 CUT-G Black Level off-set G [BLB] 0...63 0 10 FIX 31 CDL Cathode Drive Level [CL] 0...15 0 5 FIX 32 DL-PT Y-Delay time for PAL (TV) [YD] 0...15 12 4 FIX 33 DL-ST Y-Delay time for SECAM (TV) [YD] 0...15 15 8 FIX 34 DL-4T Y-Delay time for N443 (TV) [YD] 0...15 12 8 FIX 35 COL-OP COLOUR OFFSET (PAL) 0...15 8 8 FIX 36 COL-OS COLOUR OFFSET (SECAM) 0...15 8 8 FIX 37 COL-O4 COLOUR OFFSET (NTSC443) 0...15 4 4 FIX 38 SHP-OP SHARPNESS OFFSET(PAL) 0...15 8 8 FIX 39 SHP-OS SHARPNESS OFFSET(SECAM) 0...15 4 4 FIX 40 SHP-O4 SHARPNESS OFFSET(NTSC443) 0...15 8 8 FIX 41 SC-VOL SCART volume 0..255 11 5 109 FIX 42 PRE-SC Prescaler SCART input 0..127 25 25 FIX 43 PRE-FM Prescaler FM/AM 0..127 72 72 FIX 44 PRE-NICAM Prescaler SCART input 0..127 0 90 FIX 45 AVC-DKY AVC Decay 0...3 data(1.2.4.8.) 2 1 FIX 46 AC-OFF-TIM Time to set the AC-OFF 0..15 0 0 FIX

timer is in steps of 10minutes

47 DISP Language or symbols 0(symboles), 0 1 FIX

1(English), 2(French)

48 TXT-EUR Teletext pan-European language 0 (teletext pan-european language) 0 0 FIX

1 (second language;cyrillic)

2(third language;Greek) 49 BKS Black Stretch 0 (disable) or 1 (enable) 1 1 FIX 50 AVC Automatic Volume Control(AVL) 0 (disable) or 1 (enable) 0 1 FIX 51 FFI Fast Filter IF-PLL 0 (disable) or 1 (enable) 0 0 FIX 52 ACL Auto Colour Limit 0 (disable) or 1 (enable) 0 1 FIX 53 S-L Sound system L 0 (disable) or 1 (enable) 0 0 FIX 54 S-DK Sound system DK 0 (disable) or 1 (enable) 1 0 FIX 55 S-I Sound system I 0 (disable) or 1 (enable) 1 1 FIX 56 S-BG Sound system BG 0 (disable) or 1 (enable) 1 0 FIX 57 BLUE-BACK Video mute at Ident loss 0 (disable) or 1 (enable) 1 1 FIX 58 VMC Video Mute at program/source Change 0 (disable) or 1 (enable) 1 1 FIX 59 HTL Hotel mode 0 (disable) or 1 (enable) 0 0 FIX 60 BTSC Reduced FM demodulator Gain (for BTSC sig) 0 (disable) or 1 (enable) 0 0 FIX 61 AV Number of external AV sources 0 for 1 AV or 1 for 2 AV 1 0 FIX 62 FMWS FM Window Selection 0 (disable) or 1 (enable) 0 0 FIX 63 SM0 Sound Mute bit 0 0 (disable) or 1 (enable) 1 1 FIX 64 SM1 Sound Mute bit 1 0 (disable) or 1 (enable) 0 0 FIX 65 AGC0 IF AGC speed bit0 0 (disable) or 1 (enable) 1 1 FIX 66 AGC1 IF AGC speed bit1 0 (disable) or 1 (enable) 0 0 FIX 67 FOA-FE Phi 1 time constant for FE(RF) 0 (disable) or 1 (enable) 0 0 FIX 68 FOB-FE Phi 2 time constant for FE(RF) 0 (disable) or 1 (enable) 0 0 FIX 69 FOA-AV Phi 1 time constant for A V 0 (disable) or 1 (enable) 1 1 FIX 70 FOB-AV Phi 2 time constant for A V 0 (disable) or 1 (enable) 1 1 FIX 71 TXT Teletext 0 (disable) or 1 (enable) 0 1 FIX 72 TXT-WE Teletext Western or Eastern characters 0 (westem) or 1 (eastem) 0 0 FIX 73 FSL Forced V-SYNC slicing level 0 (disable) or 1 (enable) 0 0 FIX 74 HP2 Sync of OSD 0 for Ph1 or 1 for Ph2 0 0 FIX 75 CP Charge pump 0 (fast tuning) or 0 0 FIX

1 (moderate speed tuning) 76 NICAM NICAM decoding enabled 0 (disable) or 1 (enable) 0 1 FIX 77 IGR IGR decoding enabled 0 (disable) or 1 (enable) 0 0 FIX 78 AUTO Start auto tuning at POWER-ON 0 (disable) or 1 (enable) 0 0 FIX 79 TXT-TGL Function of TXT key 0 or 1 0 0 FIX 80 EVG Enable Vertical Guard 0 (disable) or 1 (enable) 1 1 FIX

• SCREEN ADJUSTMENT

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1. G2 Adjustment

1. Enter the service mode (see page 6).

2. Use the channel up or channel down buttons to enter the << BLUE-BACK >> function.

3. Set this to << BLUE-BACK: 0 >>, i.e. blue background is turned off.

4. Turn the set off at the mains.

5. Turn the set back on.

6. Set the picture control settings to normal.

7. Select the SCART input by pressing the TV/SCAR T button on the remote control. Do not connect an input to the SCART socket. A blank raster will appear.

21HS-50H

8. Connect an oscilloscope to TP851 on the CR T PWB. The waveform as in figure 4 should be displayed.

9. Adjust the G2 control (screen voltage) so that the peak of this waveform is 3.0V +/-0.1V above the zero volt line.

10. Enter the service mode.

11. Turn the blue background function back on again - set << BLUUE-BACK: 1 >>.

12. Turn off the receiver using the mains button.

13. The G2 adjustment is now complete.

2. Focus Adjustment

1. Receive a monoscope pattern signal at a level of 60 to 80 dBuV.

2. Set the picture settings to normal.

3. Adjust the focus potentiometer to obtain maximum definition.

Fig. 4

• AGC ADJUSTMENT

1. Tune the receiver into a colour bar signal on channel E-12.

2. Set the RF generator to an output signal strength of 57dBuV (+/-1dBuV) –50 Ohms unbalanced.

3. Connect an oscilloscope to TP201. TP201 is one end of R201.

4. Enter the service mode (see page 6).

5. Use the channel up and channel down buttons to enter the AGC mode.

6. By using the volume up and the volume down buttons, adjust the AGC until the voltage on TP201 drops by 0.1V

7. Change the input signal strength to 66-70dBuV and make sure that there is no noise apparent in the picture.

8. Turn the receiver off at the mains, this will exit the service mode and store the adjustment.

to 0.3V below its maximum value.

21HS-50H

• GEOMETRY ADJUSTMENT PROCEDURE

To adjust the geometry , follow the procedure outlined below:

1.Tune the set into a Philips test pattern.

2.Enter the service mode as described on page 6.

3.Use the channel up or channel down buttons to enter the desired mode

4.Use the volume buttons to achieve correct setting.

5.When adjustments are complete, use the standby button to turn off the set. The adjustment values will be stored at this point.

V-LIN Adjust the vertical linearity control so that the picture centring is as shown in figure 5.

V-AMP Adjust the vertical amplitude control so that the picture overscans as shown in figure 6.

V-CENT Adjust the vertical centring control so that the picture is centred as shown in figure 7.

Fig. 5

Fig. 6

H-CENT Adjust the horizontal centring control so that the picture is centred as shown in figure 8.

Fig. 7

Fig. 8

21HS-50H

•COLOUR ADJUSTMENT PROCEDURE

The following adjustments should only be carried out when the CRT or IC801 are replaced.

NOTES:

• This adjustment must be done after warming up the unit for 30 minutes or longer with a beam current over 700

µA.

• The red value «DRI-RS» should be fixed to 42. (Refer to “How to access service mode” section).

• «DRI-GS» adjustment alters “Y” co-ordinate.

• «DRI-BS» adjustment alters “X” and “Y” co-ordinates.

ADJUSTMENT METHOD 1 (using the signal generator, varying the picture signal)

1. Adjust G2.

2. Input a white pattern with burst signal from SCART.

3. Position the colorimeter in the centre of screen.

4. Adjusting input signal level, select a luminance of 70 nits.

5. Operate again in “service mode“ and select «DRI-GS» and/or «DRI-BS» locations to obtain colour co-ordinates:

X Y Screen temperature

0.290 ± 0.015 0.284 ± 0.015 8900º K-20 MPCD

6. Re-set the TV with the mains switch button to store the adjustment and exit service mode.

7. Check colour co-ordinates “X” and “Y” at 20 a 120 Nits. It may be necessary to repeat the same procedure to

obtain the above values.

ADJUSTMENT METHOD 2 (using the signal generator, with a fixed picture signal)

1. Adjust G2.

2. T une a white pattern with burst signal.

3. Operate in “service mode”:

4. Using «SUB-CON», select a luminance of 70 nits.

5. Operate again in “service mode“ and select «DRI-GS» and/or «DRI-BS» locations to obtain colour co-ordinates:

X Y Screen temperature

0.290 ± 0.015 0.284 ± 0.015 8900º K-20 MPCD

6. Select «SUB-CON». Return data to “63”.

7. Re-set the TV with the mains switch button to store the adjustment and exit service mode.

8. Check colour co-ordinates “X” and “Y” at 20 a 120 Nits. It may be necessary to repeat the same procedure to

obtain the above values.

21HS-50H

MOTHER UNIT

CHASSIS LA YOUT

CRT UNIT

LED FLASHING CODE

PURPOSE: The led indicates the power mode,ocurred I2C error and On timer

INPUT: - Current power mode

- I2C Errors

- On timer

Processing: - If in ST ANDBY mode and On timer in-active then switch LED off.

- If in STANDBY and On timer active set LED to blinking, (switch on and off at 1 Hz with a 50 % duty cycle).

- If in POWER-ON mode, switch LED on.

- If an I2C error occurred, let the LED blink at 1 Hz, 50 % duty cycle. For the blinking times see the Table below .

Note: Only when an I2C error occurs for a number of times, or for a number of seconds,

the I2C error is handled by the system (that is ,only then the set will go to standby, the led starts blinking).

21HS-50H

IC/Module Name Slave Address Bus Error LED Remarks Ref. No.

Blinking Time

M24C04 A0,A2 2 512x8 EEPROM IC1002 TDA935x/6x/8x 8A 3 Address of internal TV processor IC801 VTST6HD64 or C0 6 PLL Tuner TU201 CTF551 C0 6

MSP34x5G 80 5 Multistandard Sound Processor IC3001 Table Error LED blinking times

F 7341N0 PRINTED WIRING BOARD. Components side.

56 78

101

21HS-50H

F 7340N4 PRINTED WIRING BOARD. Components side.

10 11

12 1323456789

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