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28HW-53E

CONTENTS





SHARP CORPORATION

PAL B/G, I / SECAM L/L’, B/G, D/K SYSTEM COLOUR TELEVISION

SEJB28HW53E00

SERVICE MANUAL

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.

Issued: 17th Dec 2001

This document has been published to

be used for after sales service only.

DA-50W CHASSIS

ELECTRICAL SPECIFICATIONS......................3

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

ADJUSTMENTS PROCEDURES......................5

LED FLASHING CODES..................................10

PRINTED WIRING BOARDS............................11

COMPONENT LOCATION TABLES.................18

SCHEMATIC DIAGRAMS.................................24

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

PARTS LISTING...............................................33

PACKING OF THE SET & ACCESSORIES.....42

CONTROLS &TERMINALS..............................43

MODEL

28HW-53E

ES/F/IT/SE

28HW-53E

Use this page to keep any special servicing information as Technical Report (Bulletin), Technical 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).

SERVICE MANUAL UPDATE LOG SHEET

Part No.

Technical Report No.

Technical Bulletin No. Cause / Solution Page No. Application

Data /Serial No.

28HW-53E

ELECTRICAL SPECIFICATIONS

•Picture Intermediate frequency

L’..................................................33.9MHz

L, B/G, D/K,I................................38.9MHz

•Sound Carrier Trap

L’..................................................40.4MHz

L, D/K...........................................32.4MHz

B/G..............................................33.4MHz

I....................................................32.9MHz

•Adjacent Sound Carrier Trap

L’...................................................32.4MHz

L, D/K, B/G..................................40.4MHz

I....................................................40.9MHz

•Adjacent Picture Carrier Trap

L’..........................................................41.9MHz

L, D/K,I.........................................30.9MHz

B/G..............................................31.9MHz

•Aerial Input Impedance

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

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

VHF: IR A - J / S1 - S41 CH (Hiperband)

UHF: I21 - I69 CH

CATV Special Channels

•White Level

Set brightness control to get total picture tube cathode current of 600 microampere under no

signal condition. Maximum necessary correction of each picture tube cathode current to get 8550

degrees K+1 MPCD screen temperature should not exceed 15% of its original value.

X=0.290 Y=0.300

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

•Power Consumption

Normal Operation ...................................88W

Stand-by Operation .............................. 1.3W

•Audio Power Output Rating (MPO) / Impedance

Internal Left Speaker ...................... 10W, 7Ω

Internal Right Speaker .................... 10W, 7Ω

•Speakers

Left / Right ....................................... 6 x 12cm

•Convergence

Static (Centre) between any two colours...........

..................................................... 0.12 cm max.

Dynamic after static equals zero... 0.28cm max.

•Focus ......................... High Bi-Potential Electrostatic

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

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.

Specifications are subject to change without prior notice.

MODEL DESTINATION (Operation Manual languages).

28HW-57EES: Portuguese and Spanish.

28HW-5EF: French.

28HW-57EIT: Italian.

28HW-57ESE: Danish, English, Finnish, Norwegian and Swedish.

28HW-53E

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 discon-

nected 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 CRT by 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 32 KV,

(at a instantaneous beam current of 1500µΑ).

2. Ensure that during normal operation the EHT does not exceed 30KV±1.5KV (at a beam current of

1300µΑ). 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 CRT with any other type than that specified in the parts listing as this may

cause excessive x-ray radiation.

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.

28HW-53E

ADJUSTMENT PROCEDURES

All adjustments to this chassis, except for focus, are carried out in the service mode.

••

•SERVICE MODE

The service mode is provided to enable the engineer to correctly set up the receiver to the CRT fitted in the set.

Note that these adjustments may vary from one receiver to another.

To enter the service mode, carry out the following procedure.

1. Connect a test pattern to the antenna terminal.

2. Tune the receiver to this signal.

3. Turn the receiver off using the mains switch.

4. Press volume down and channel up buttons on the

front of the receiver at the same time.

5. Keeping these buttons pressed, turn the mains on.

6. When the set starts up it will be in service mode.

7. Release the two buttons.

••

•Use the channel up and down buttons to move between the options.

••

•Use the volume control buttons to change the data.

••

•To store the data, use the stand-by button on the remote control.

••

•To exit the service mode, turn the receiver off using the mains switch.

When the service mode is entered the following On Screen Display appears

-SERVICE SOFTWARE AND HEXADECIMAL COUNTER DISPLAY:

SW ON XXXX SW OFF XXXX HOURS ON XXXX

The figures displayed in the XXXX locations are hexadecimal representations of the number of times that particular

function has been executed. For example if the hexadecimal number displayed after SW ON was 0E4A, this would

correspond to the receiver being turned on 3658 times.

Adjustment menu:

The following adjustments can be carried out in the service mode.

•Horizontal Shift

• East West Width

• Pin Phase

• Pin Amp

• Corner Amplitude

• Corner Symmetry

• Vertical Linearity

• Vertical Angle

• Vertical Bow

• Vertical Amplitude

• S Correction

• Vertical Shift

• Red Gain

• Green Gain

• Blue Gain

• Red Cut Off

• Green Cut Off

• Blue Cut Off

• Alter NVM Page

• Alter NVM Position

• Alter NVM Value

• Teletext Mix Mode Contrast

• Teletext Contrast

• OSD Contrast

• DVCO Adjustment (Only PAL)

• DVCO Adjustment (Only NTSC)

• AGC Adjustment

• AFT Adjustment

• AFT Adjustment for L’

• OPC Value

• Auto Installation On/Off

Geometry Adjustments

All geometry adjustments are based on an internally generated test pattern as shown

in figure 1. When carrying out any of the above geometry adjustments, use the inter-

nally generated test pattern for guidance.

Fig.1

28HW-53E

Note that the receiver should be set to FULL MODE before carrying out any geometry adjustments. This can be

achieved by pressing the widescreen mode button on the remote control until FULL MODE appears on the OSD. This

can only be done out of the service mode.

The following geometry adjustments can be carried out. Detailed instructions on how to execute these are given on

the following pages

Horizontal

• Horizontal Shift

• E-W Width

• Pin Phase

• Pin Amp

• Corner Amplitude

• Corner Symmetry

Vertical

• Vertical Amplitude

• Vertical Shift

• Vertical Bow

• Vertical Angle

• S Correction

• Vertical Linearity

Just in case the the TV set requires a full geometries adjustment, please proceed first with

Vertical according to the above order, and after that, adjust Horizantal according to the

above order.

Horizontal Shift

Adjust the horizontal shift so that the picture is centred.

The effect of this adjustment is shown in figure 2.

•When the volume up button is pressed, the picture moves to the right.

•When the volume down button is pressed, the picture moves to the left.

•Press the stand-by button on the remote control to store.

E-W Width

Adjust the E-W Width so that 9% over-scan is achieved.

The effect of this adjustment is shown in figure 3.

•When the volume up button is pressed, horizontal scanning increases.

•When the volume down button is pressed, horizontal scanning decreases.

•Press the stand-by button on the remote control to store.

Pin Phase

Adjust the Pin Phase so that the picture is symmetrical top and bottom.

The effect of this adjustment is shown in figure 4.

•When the volume up button is pressed, side pincushion changes.

•When the volume down button is pressed, side pincushion changes.

•Press the stand-by button on the remote control to store.

Pin Amp

Adjust the Pin Amplitude so that the picture is centred.

The effect of this adjustment is shown in figure 5.

•When the volume up button is pressed, side pincushion changes from pincushion to

barrel shape.

•When the volume down button is pressed, side pincushion changes from pincush-

ion to barrel shape.

•Press the stand-by button on the remote control to store.

Corner Amplitude

Adjust the Corner Amplitude so that the picture is centred.

The effect of this adjustment is shown in figure 6.

Note: This adjustment affects to upper and lower sides.

• When the volume up button is pressed, side pincushion changes from pincushion to

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

28HW-53E

barrel shape.

•When the volume down button is pressed, side pincushion changes from pincushion to

barrel shape.

•Press the stand-by button on the remote control to store.

Corner Symmetry

Adjust the Corner Symmetry so that the picture is centred.

The effect of this adjustment is shown in figure 7.

Note: This adjustment affects to upper and lower sides.

• When the volume up button is pressed, side pincushion changes from pincushion to

barrel shape.

• When the volume down button is pressed, side pincushion changes from pincushion to

barrel shape.

• Press the stand-by button on the remote control to store.

Vertical Linearity

Adjust the Vertical Linearity so that the upper and lower parts of the picture are symmetrical.

The effect of this adjustment is shown in figure 8.

• When the volume up button is pressed, the upper picture scanning decreases and the

lower picture scanning increases.

• When the volume down button is pressed, the upper picture scanning increases and the

lower picture scanning decreases.

• Press the stand-by button on the remote control to store.

Vertical Angle

Adjust the Vertical Angle so that the picture is centred.

The effect of this adjustment is shown in figure 9.

• When the volume up button is pressed, side pincushion changes, specially the lower

picture.

• When the volume down button is pressed, side pincushion changes, specially the lower

picture.

• Press the stand-by button on the remote control to store.

Vertical Bow

Adjust the Vertical Amplitude so that the picture is centred.

The effect of this adjustment is shown in figure 10.

• When the volume up button is pressed, side pincushion changes from pincushion to

barrel shape, specially the lower picture.

• When the volume down button is pressed, side pincushion changes from pincushion to

barrel shape, specially the lower picture.

• Press the stand-by button on the remote control to store.

Vertical Amplitude

Adjust the Vertical Amplitude so that the picture is over-scanned.

The effect of this adjustment is shown in figure 9.

• When the volume up button is pressed, the vertical size of the picture increases.

Fig.8

Fig.9

Fig.10

Fig.11

Fig.7

28HW-53E

Colour Adjustments

The following adjustments should only be carried out when

the CRT or IC801 are replaced.

G2, Cut Off and Gain Adjustments

1. Follow the procedure below to set the G2

1.1 Tune the set to the output of a signal generator

(cross hatch pattern).

1.2 In the user menu, set contrast to 80/100 and

brightness to 40/100.

1.3 Connect the oscilloscope to the red cathode and

adjust G2 to read 140V on the sensor pulse as

in the drawing:

NOTE:

Oscilloscope should be adjusted for vertical TV field trigger

and synchronized with video signal.

2. Follow the procedure below to set the Cut Off.

2.1 Adjust G2.

2.2 Tune a white card.

2.3 Adjust colour to minimum.

2.4 Position colorimeter in the centre of screen.

2.5 Adjust brightness and contrast to obtain a lumi-

nance of ≈20 NITS.

2.6 Operate in Service Mode and select location RED

CUT OFF, GREEN CUT OFF and BLUE CUT

OFF, to obtain colour coordinates:

X=0.290 ± 0.015 Y=0.300 ± 0.015

To increase press volume-up button and to decrease press

volume down button.

RED CUT OFF alter «X» coordinate.

GREEN CUT OFF alter «Y» coordinate.

BLUE CUT OFF alter «X» and «Y» coordinate.

3. Follow the procedure below to set the GAIN.

3.1 Using brightness and contrast buttons, select a

luminance of ≈120 NITS.

3.2 Operate in Service Mode and select location RED

GAIN, GREEN GAIN and BLUE GAIN, to obtain

colour coordinates:

X=0.290 ± 0.015 Y=0.300 ± 0.015

To increase press volume-up button and to decrease

press volume down button.

RED CUT OFF alter «X» coordinate.

GREEN CUT OFF alter «Y» coordinate.

BLUE CUT OFF alter «X» and «Y» coordinate.

3.3 Exit Service Mode and check colour coordinates

«X» and «Y» at 20 and 120 NITS. It may be nec-

essary to repeat procedure 2 and 3 of Colour

Adjustments.

Fig.12

Fig.13

• When the volume down button is pressed, the vertical size of the picture decreases.

• Press the stand-by button on the remote control to store.

S Correction

Adjust the S Correction so that the picture symmetrical between the top, centre and bottom.

The effect of this adjustment is shown in figure 12.

• When the volume up button is pressed, the top and bottom scanning increases and the

centre scanning decreases.

• When the volume down button is pressed the top and bottom scanning decreases and

the centre scanning increases.

• Press the stand-by button on the remote control to store.

Vertical Shift

Adjust the Vertical Shift so that the picture is centred.

The effect of this adjustment is shown in figure 13.

• When the volume up button is pressed, the picture moves down.

• When the volume down button is pressed, the picture moves up.

• Press the stand-by button on the remote control to store.

140 V

CH1 gnd

28HW-53E

G2, Cut Off and Gain Adjustments (alternative method).

In the event off a Colorimeter not being available, please follow the following procedures to obtain correct G2 and Grey

scale settings.

1. Tune the set to the output of a RF signal generator (cross hatch pattern).

2. In the user menu, set the picture levels to the FACTORY settings.

3. In the user menu, set the tint control to its central position.

4. Enter the service mode.

5. Set the ABL levels in the NVM by adjusting positions 60, 61, 62, 63, 64 and 65 on page 00 to read 80. Store each

location by pressing the stand-by button on the remote control.

6. Adjust the G2 and grey scale as below.

When adjusting the grey scale the following boxes will appear on the screen.

(RED) (GREEN) (BLUE)

(GAIN) ** ** **

(CUT OFF) e.g. 70 ** **

i. Using cross hatch pattern set the G2 so that the display in the Red cut off box reads between 60 and 80 as above.

NB. When adjusting the grey scale, the figures displayed in the boxes are an indication of the CRT’s performance

only. The data to be adjusted is contained in the box at the bottom right corner of the picture.

ii. Select a grey scale signal, then set the Red Cut-off level to 32 and the Red-Gain to 50.

iii.Leave the Red Cut-off and Gain as above and adjust Green and Blue Cut-off and Gain to achieve correct grey scale

tracking. As with all grey scale adjustments it will be necessary to readjust the settings to achieve good tracking.

Changing NVM Data

To change the data contained within the Non Volatile Memory, it is necessary to first select the page the data is stored in,

then the position and finally to change the data itself. The procedure below outlines this process.

1. While on ALTER NVM PAGE, use the volume up/down buttons to change this data (data is shown in hexadecimal

format).

2. Press the channel up button and ALTER NVM POSITION appears, use the volume up/down buttons to change this data

(data is shown in hexadecimal format).

3. Press the channel up button and ALTER NVM VALUE appears, use the volume up/down buttons to change this data

(data is shown in hexadecimal format).

4. Once this data has been set, press the standby button to store.

5. If another NVM value has to be changed, use the channel down button to select the page or position and repeat as

necessary.

Note:

DO NOT change any NVM data, unless you have been advised to do so by a Sharp representative. If data is incorrectly

changed, serious damage may occur to the receiver.

Contrast Adjustments

Three types of contrast levels can be varied as listed below:

• TELETEXT MIX MODE CONTRAST

• TELETEXT CONTRAST

• OSD CONTRAST

Use the volume up/down buttons to adjust to a suitable level, then press the standby button to store.

28HW-53E

DVCO Adjustment (PAL)

Carry out the DVCO Adjustment (PAL) as shown below:

1. Receive a Phillips pattern signal.

2. While in the DVCO ADJUSTMENT (PAL) menu, press

the standby button.

3. The adjustment will be carried out automatically and

stored.

DVCO Adjustment (NTSC)

No adjustment required.

Auto Installation On/Off

To return the receiver to the original Auto Installation mode,

using the volume up or down button, set the Auto Installa-

tion On/Off to On. This setting is automatically stored and

when the receiver is turned on the next time it will start up in

Auto Installation mode.

AGC Adjustment

To correctly align the Automatic Gain Control, follow the

procedure outlined below:

1. Tune the set into a pattern generator on CH10.

2. Adjust the signal strength of the pattern generator to 57uV

3. Enter the service mode.

4. Enter the AGC Adjustment menu.

5. Press the standby button on the remote control.

6. The adjustment will be carried out and stored

automatically.

AFT Adjustment (BG-I, SECAM L)

To correctly align the Automatic Fine Tune, follow the

procedure outlined below:

1. Tune the set into a pattern generator on CH69.

2. Enter the service mode.

3. Enter the AFT Adjustment menu.

4. Press the standby button on the remote control.

5. The adjustment will be carried out and stored

automatically.

AFT Adjustment (SECAM L’)

To correctly align the Automatic Fine Tune, follow the

procedure outlined below:

1. Tune the set into a pattern generator on F04.

2. Enter the service mode.

3. Enter the AFT Adjustment menu.

4. Press the standby button on the remote control.

5. The adjustment will be carried out and stored

automatically.

LED FLASHING CODES

This model is not provided with stereo led, so to let “flashing

codes” for IC failures detection when the TV set does not

work, we have answered with the next solution:

• The detection of failure will be made with an external LED.

• The output of the flashing code will be via AV1 (pin 12).

• Insert a generic led diode between pin 12 and ground (i.e.

pin 5, 13 or 21) as shows the below picture.

Follow the sequence according to the information below, as

a guide to fault finding.

1. Unable to read or write into NVM: 66% ON, 33% OFF

twice and OFF for a second.

2. MSP failure: 66% ON, 33% OFF for three times and

OFF for a second.

3. VDP failure: 66% ON, 33% OFF for four times and OFF

for a second.

NOTE:

If you want to check that the system is working, open resis-

tor R307 to avoid I2C comunication with MSP. The TV set

will flash three times and OFF for a second, showing MSP

failure.

Then the system is working properly.

21 19 17 15 13 11 9 7 5 3 1

20 1 16 14 12 10 6 4 2

On Off