Akira 14BM19 Schematic

FILE NO. SM-CTV-O-159

COLOR TELEVISION

SERVICE MANUAL

MODEL NO. 14BM19

CHASSIS NO. EX-1A4

Please read this manual carefully before service

TABLE OF CONTENTS

SPECIFICATIONS··················································································································1

SAFETY INSTRUCTIONS AND MAINTENANCE········································2

X-RAY RADIATION PRECAUTION ···································································································2

SAFETY PRECAUTION ····················································································································

PRODUCT SAFETY NOTICE ···········································································································

SAFETY SYMBOL DESCRIPTION ···································································································

MAINTENANCE·································································································································

2

3

3

4

ADJUSTMENTS

SET-UP ADJUSTMENTS ··················································································································5

CIRCUIT ADJUSTMENTS·················································································································

······················································································································

5

8

STRUCTURE AND CHASSIS FUNCTION DESCRIPTION

STRUCTURE BLOCK DIAGRAM···································································································13

BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM·································································

CHASSIS DESCRIPTION···············································································································

···············

13

14

15

SERVICE DAT A···················································································································· 16

TECHNICAL DATA OF KEY ICS ···································································································· 16

WAVEFORMS OF KEY POINTS ····································································································

31

SERVICE DATA OF KEY ICS·········································································································

REPLACEMENT OF PARTS ··········································································································

APPENDIX

1. CIRCUIT DIAGRAM

2. PRINTED CIRCUIT BOARD DIAGRAMS

3. FINAL WIRING DIAGRAM

4. FINAL ASSEMBLY DIAGRAM

S

33

37

SERVICE MANUAL

SPECIFICATIONS

Model Number 14BM19

Color

RF system

Receiving

channel

Programs preset 236(0-235)

Antenna input

Picture tube (Approx.)

Effective screen dimensions

Audio output (THD 7%)

system

Sound

system

VHF

UHF

CATV

PAL4.43, NTSC3.58, NTSC4.43, SECAM

B/G, I, M, D/K

C12 (49.75-85.25MHz, 168.25-216.25MHz)

C1

C57 (471.25-863.25MHz)

C13

Z7 (111-167MHz)

Z1

Z8

Z35 (223-447MHz)

(unbalanced)

75

280

210mm

2W

2

Power source 110-240V ~, 50/60Hz

Weight (Approx.) 11kg

Dimensions

H D) (Approx.)

(W

Rated power consumption 69W

Note: Designs and specifications are subject to change without notice.

339 395mm

418

1

SERVICE MANUAL

INSTRUCTIONS FOR SERVICE SAFETY AND MAINTENANCE

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE X-RA Y RADIATION PRECAUTION ,

SAFETY PRECAUTION AND PRODUCT SAFETY NOTICE INSTRUCTION BELOW.

X-RAY RADIATION PRECAUTION

1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit

X-ray radiation as result of excessive EHT voltage. The maximum EHT voltage permissible in any

operating circumstances must not exceed the rated value. When checking the EHT, use the High

Voltage Check procedure in this manual using an accurate EHT voltmeter.

2. The only source of X-RAY radiation in this TV is the CRT. The TV minimizes X-RAY radiation, which

ensures safety during normal operation. To prevent X-ray radiation, the replacement CRT must be

identical to the original fitted as specified in the parts list.

3. Some components used in this TV have safety related characteristics preventing the CRT from

emitting X-ray radiation. For continued safety, replacement component should be made after

referring the PRODUCT SAFETY NOTICE below.

4. Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT

anode. So ensure that the maximum EHT voltage does not exceed the rated value after service

and adjustment.

SAFETY PRECAUTION

WARNING: REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.

1. The TV has a nominal working EHT voltage. Extreme caution should be exercised when working

on the TV with the back removed.

1.1 Do not attempt to service this TV if you are not conversant with the precautions and procedures for

working on high voltage equipment.

1.2 When handling or working on the CRT, always discharge the anode to the TV chassis before

removing the anode cap in case of electric shock.

1.3 The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take extreme

care while handling.

1.4 Do not hold the CRT by the neck as this is a very dangerous practice.

2. It is essential that to maintain the safety of the customer all power cord forms be replaced exactly

as supplied from factory.

3. Voltage exists between the hot and cold ground when the TV is in operation. Install a suitable

isolating transformer of beyond rated overall power when servicing or connecting any test

equipment for the sake of safety.

4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below 35W).

2

SERVICE MANUAL

5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to

avoid electronic gun magnetized and decrement in convergence of the CRT.

6. When remounting the TV chassis, ensure that all guard devices, such as nonmetal control buttons,

switch, insulating sleeve, shielding cover, isolating resistors and capacitors, are installed on the

original place.

7. Replace blown fuses within the TV with the fuse specified in the parts list.

8. When replacing wires or components to terminals or tags, wind the leads around the terminal

before soldering. When replacing safety components identified by the international hazard symbols

on the circuit diagram and parts list, it must be the company-approved type and must be mounted

as the original.

9. Keep wires away from high temperature components.

PRODUCT SAFETY NOTICE

CAUTION: FOR YOU PROTECTION, THE FOLLOWING PRODUCT SAFETY NOTICE SHOULD BE
READ CAREFULLY BEFORE OPERATING AND SERVICING THIS TV SET.

1. Many electrical and mechanical components in this chassis have special safety-related

characteristics. These characteristics are often passed unnoticed by a visual inspection and the

X-ray radiation protection afforded by them cannot necessarily be obtained by using replacements

rated at higher voltages or wattage, etc. Components which have these special safety

characteristics in this manual and its supplements are identified by the international hazard

symbols on the circuit diagram and parts list. Before replacing any of these components read the

parts list in this manual carefully. Substitute replacement components which do not have the same

safety characteristics as specified in the parts list may create X-ray radiation.

2. Do not slap or beat the cabinet or CRT, since this may result in fire or explosion.

3. Never allow the TV sharing a plug or socket with other large-power equipment. Doing so may result

in too large load, causing fire.

4. Do not allow anything to rest on or roll over the power cord. Protect the power cord from being

walked on, modified, cut or pinched, particularly at plugs.

5. Do not place any objects, especially heavy objects and lightings, on top of the TV set. Do not install

the TV near any heat sources such as radiators, heat registers, stove, or other apparatus that

produce heat.

6. Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use and

servicing of this TV set. Otherwise, the resulted damage is not protected by the manufacturer.

SAFETY SYMBOL DESCRIPTION

The lightning symbol in the triangle tells you that the voltage inside this product may be

strong enough to cause an electric shock. Extreme caution should be exercised when

3

SERVICE MANUAL

working on the TV with the back removed.

This is an international hazard symbol, telling you that the components identified by the

symbol have special safety-related characteristics.

UL

C UL

FDA

This symbol tells you that the critical components identified by the FDA marking have

special safety-related characteristics.

This symbol tells you that the critical components identified by the UL marking have

special safety-related characteristics.

This symbol tells you that the critical components identified by the C-UL marking have

been evaluated to the UL and C-UL standards and have special safety-related

characteristics.

VDE

This symbol tells you that the critical components identified by the VDE marking have

special safety-related characteristics.

MAINTENANCE

1. Install the TV set on a stable and level surface. Do not place the set near or over a radiator or heat

register, or where it is exposed to direct sunlight.

2. Do not install the TV set in a place exposed to rain, water, excessive dust, mechanical vibrations or

impacts.

3. Allow enough space (at least 10cm) between the TV and wall or enclosures for proper ventilation.

4. Slots and openings in the cabinet should never be blocked by clothes or other objects.

5. Please power off the TV set and disconnect it from the wall immediately if any abnormal condition

are met, such as bad smell, belching smoke, sparkling, abnormal sound, no picture/sound/raster.

Hold the plug firmly when disconnecting the power cord.

6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for

cleaning the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol cleaners.

4

SERVICE MANUAL

ADJUSTMENTS

SET-UP ADJUSTMENTS

The following adjustments should be made when a complete realignment is required or a new picture

tube is installed.

Perform the adjustments in the following order:

1. Color purity

2. Convergence

3. White balance

Notes:

The purity/convergence magnet assembly and rubber wedges need mechanical positioning.
For some picture tubes, purity/ convergence adjustments are not required.

1. Color Purity Adjustment

Preparation:

Before starting this adjustment, adjust the vertical sync, horizontal sync, vertical amplitude and

focus.

1.1 Face the TV set north or south.

1.2 Connect the power plug into the wall outlet and turn on the main power switch of the TV set.

1.3 Operate the TV for at least 15 minutes.

1.4 Degauss the TV set using a specific degaussing coil.

1.5 Set the brightness and contrast to maximum.

1.6 Counter clockwise rotate the R/B low brightness potentiometers to the end and rotate the green low

brightness potentiometer to center.

1.7 Receive green raster pattern signals.

1.8 Loosen the clamp screw holding the deflection yoke assembly and slide it forward or backward to

display a vertical green zone on the screen. Rotate and spread the tabs of the purity magnet

around the neck of the CRT until the green zone is located vertically at the center of the screen.

1.9 Slowly move the deflection yoke assembly forward or backward until a uniform green screen is

obtained.

1.10 Tighten the clamp screw of the assembly temporarily. Check purity of the red raster and blue raster

until purities of the three rasters meet the requirement.

5

SERVICE MANUAL

g

Adj

)

(

)

g

y

Deflection Coil

Dummy Wedge

Rubber Wedge

Glass Cloth Tapes

4-pole Magnet

Purity Magnet

Conver

ence Magnet Assembl

Purity/Convergence
Ma

net Module

6-pole Magnet

Deflection Yoke

Fig. 1

ust the Angle (Vertical Lines

Adjustment of Magnets

Fig. 2

Adhesive

Fixed

Rotate Two Tabs At the
Same Time

Horizontal Lines

2. Convergence Adjustment

Preparation:

Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes.

2.1 Center convergence adjustment

2.1.1 Receive dot pattern.

2.1.2 Adjust the brightness/contrast controls to obtain a sharp picture.

2.1.3 Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue

vertical lines are superimposed each other on the center of the screen.

2.1.4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue

horizontal on the center of the screen.

2.1.5 Adjust two tabs of the 6-pole magnet to superimpose red/blue line and green line.

2.1.6 Remember red and blue movement. Repeat steps2.1.3-2..1.5 until optimal convergence is

6

SERVICE MANUAL

obtained.

2.2 Circumference convergence adjustment

2.2.1 Loosen the clamp screw holding the deflection yoke assembly and allow it tilting.

2.2.2 Temporarily put the first wedge between the picture tube and deflection yoke assembly. Move

front of the deflection yoke up or down to obtain better convergence in circumference. Push the

mounted wedge in to fix the yoke temporarily.

2.2.3 Put the second wedge into bottom.

2.2.4 Move front of the deflection yoke to the left or right to obtain better convergence in

circumference.

2.2.5 Fix the deflection yoke position and put the third wedge in either upper space. Fasten the

deflection yoke assembly on the picture tube.

2.2.6 Detach the temporarily mounted wedge and put it in either upper space. Fasten the deflection

yoke assembly on the picture tube.

2.2.7 After fastening the three wedges, recheck overall convergence and ensure to get optimal

convergence. Tighten the lamp screw holding the deflection yoke assembly.

BLU Red Red/BLU

BLU

Red

Red/BL

U

4-pole Magnet Movement 6-pole Magnet

Movement

Incline the Yoke up (or down) Incline the Yoke Right(or left)

Circumference Convergence by DEF Yoke

Fig. 3

3. White Balance Adjustment

Generally, white balance adjustment is made with professional equipment. It’s not practical to get

2

good white balance only through manual adjustment. For TVs with I

C bus control, change the bus

data to adjust white balance.

7

SERVICE MANUAL

CIRCUIT ADJUSTMENTS

Preparation:

Circuit adjustments should be made only after completion of set-up adjustments.

Circuit adjustments can be performed using the adjustable components inside the TV set. For TVs with

2

C bus control, first change the bus data.

I

1. Degaussing

A degaussing coil is built inside he TV set. Each time the TV is powered on, the degaussing coil will

automatically degauss the TV. If the TV is magnetized by external strong magnetic field, causing

color spot on the screen, use a specific degausser to demagnetize the TV in the following ways.

Otherwise, color distortion will be shown on the screen.

1.1 Power on the TV set and operate it for at least 15 minutes.

1.2 Receive red full-field pattern.

1.3 Power on the specific degausser and face it to the TV screen.

1.4 Turn on the degausser. Slowly move it around the screen and slowly take it away from the TV.

1.5 Repeat the above steps until the TV is degaussed completely.

2. Supply Voltage Adjustment

Caution: +B voltage has close relation to high voltage. To prevent X-ray radiation, set +B voltage to
the rated voltage.

2.1 Make sure that the supply voltage is within the range of the rated value.

2.2 Connect a digital voltmeter to the +B voltage output terminal of the TV set. Power on the TV and set

the brightness and sub-brightness to minimum.

2.3 Regulate voltage adjustment components on the power PCB to make the voltmeter read 115±1V.

3. High Voltage Inspection

Measure voltages of test points on the main PCB with the digital voltmeter. Measure the CRT high

voltage with the high-voltage testing equipment and heater voltage with the high-frequency

effective voltmeter. The rated values are shown as below.

Test Point Voltage Value (V)

Positive of C492

Filament pin of socket

Anode of 14” CRT (including IRICO, BMCC and Thai)

Anode of 14” Lithuania CRT

Notes:

Measure voltage of the related isoelectronic point if it’s difficult to measure a certain point in Table 1.
Anode high voltage differs depending on CRTs used, which should be decided by engineers.

6.3V

22KV

25KV

8

185V

5V

0.3

V

RMS

1.3KV

1.3KV

SERVICE MANUAL

4. Focus Adjustment

Caution: Dangerously high voltages are present inside the TV. Extreme caution should be
exercised when working on the TV with the back removed.

4.1 After removing the back cover, look for the FBT on the main PCB. There should be a FCB on the

FBT.

4.2 Power on the TV and preheat it for 15 min.

4.3 Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture.

5. Safety Inspection

5.1 Inspection for insulation and voltage-resistant

Perform safety test for all naked metal of the TV. Supply high voltage of 3000V AC, 50Hz (limit

current of 10mA) between all naked metal and cold ground. Test every point for 3 min. and ensure

no arcing and sparking.

5.2 Requirements for insulation resistance

Measure resistance between naked metal of the TV and feed end of the power cord to be infinity

with a DC-500 high resistance meter and insulation resistance between the naked metal and

degaussing coil to be over 20M

6. DESIGN/SERVICE mode

6.1 To enter the USER SERVICE mode

Caution: The user service mode adjustment can be changed only when service personnel adjust

the whole set data during servicing. As the control data have dramatic effects on functions and

performance of the TV, service personnel should not tell user how to

enter the SERVICE mode to avoid improper data settings.

6.1.1 Set the volume to 0. Then press and hold the MUTE button on

the remote control, and press the MENU button on the TV to

enter the SERVICE mode. (In this case, the S mode cannot be

stored in the EEPROM. To exit from the S mode, turn off the TV set. )

6.1.2 After entering the S mode, Red

is default. Use the POS+/- buttons to highlight an adjustment and the VOL+/- buttons to adjust

it. The adjusted data are immediately output and stored in the EEPROM

.

S

VS 0-3F 25

xxxxxxxx

S is displayed on the upper center of the screen and MENU1

6.2 Bus data in the S mode
Table 1 Adjustment and Option Data in S mode

Item Adjustment Description Remarks

CORE 03 Coring (for some CPU only)

0-IF 20 Sound adjustment setting (for some CPU only)

5PAR/6P

AR

5BOW/6

BOW

1F Parallelogram correction (for large-screen only)

1F Curve correction (for large-screen only)

(continued)

9

SERVICE MANUAL

5HSH/6H

SH

5EWW/6

EWW

5EWP/6

EWP

5UCR/6

UCR

5LCR/6L

CR

5EWT/6

EWT

5VSL/6V

SL

5VAM/6V

AM

5SCL/6S

CL

5VSH/6V

SH

5VOF/6V

OF

Set to the

optimal mode

1F East-West correction (for large-screen only)

1F

1F

1F

1F Trapezoidal correction (for large-screen only)

1F Vertical slope (for large-screen only) *

1F

Set to the

optimal mode

Set to the

optimal mode

Set to the

optimal mode

Horizontal center in the TV mode for 50Hz/60Hz

For 50Hz,

5HSH is displayed for 60Hz, 6HSH

is displayed.

East-West parabola correction (for large-screen

only)

Upper corner parabola correction (for large-screen

only)

Lower corner parabola correction (for large-screen

only)

Vertical amplitude; For 50Hz,

displayed

for 60Hz, 6VAM is displayed.

5VAM is

S correction *

Vertical center in the TV mode for 50Hz/60Hz. For

50Hz,

5VSH is displayed for 60Hz, 6VSH

is displayed.

OSD vertical center *

*

*

*

VX 19 Vertical zoom (for large-screen only)

RED 20 Red gun cutoff voltage *

GRN 20 Green gun cutoff voltage *

WPR 1F Red gun drive voltage *

WPG 1F Green gun drive voltage *

WPB 1F Blue gun drive voltage *

YDFP/Y

DFN

07

PAL brightness delay time/ NTSC brightness delay

time

TOP 10-1F UOC AGC *

TV audio output power can be adjusted by means of

UOC audio output amplitude. Generally, UOC audio

output amplitude is set to 26 for 21” models with

VOL 24

stereo output of 3W+3W; 2C for 21” models with

***

stereo output of 5W+5W; 24 for 14” models with

mono output of 2WX2; 22 for 14” models with mono

output of 1WX2.

(continued)

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SERVICE MANUAL

IFFS

03

02

PIF (02-38.9MHz, 03-38MHz)

HDOL 00-07 Cathode drive level (typical: 04-07)

AGC 03 IF ACG speed

VG2 brightness setting(VG2B): 3A for 21” models;

2E for 14” models;

VG2B 3A

Contrast Max. setting (MCON): 30 for 21” Malaysia

Matsushita or BMCC CRT with ferrite mask;

MCON: 30; VG2B: 30, HDOL: 04 for 21” Chunghwa

CRT

SBRI 1F Sub brightness

MBRI 30 Brightness Max.

SCON 20 Sub contrast

MCON 39 Contrast Max.

SCOL 32 Sub color

OP1 BF Option set byte 1 ***

OP2 01 Option set byte 2 ***

OP3 FF Option set byte 3 ***

OP4 F6 Option set byte 4 ***

OP5 76 Option set byte 5 ***

OP6 3C Option set byte 6 ***

INIT EEPROM initialization

VG2 Adjusting screen voltage with VG2 *

VSD Vertical output off

STS0/1/2 System status byte

Notes:

The data marked with

* have been adjusted in the MANUFACTURE mode. Take care when in

service and adjustment.

To write in logo, use the

/ buttons to highlight an adjustment and the / buttons to adjust.

The data sheet may differ dependent on different models.
The data sheet may differ dependent on different CRTs for the same model.

6.3 Option set

With remote control system software TDA935X, all options can be set in the SERVICE mode and

stored in EEPROM. Data related to picture, sound and geometric adjustment are also stored in

EEPROM.

11

SERVICE MANUAL

Table 2 Function Option Bit Setting

Bit Item Description Data

0 OP_HOTEL Hotel mode (1: Yes, 0: No) 1

Channels preset: 1: 236 channels

0: 100 channels

Two sets of AV inputs: 1: Two sets of separate AV inputs

0

Two sets of parallel AV inputs or one set of AV inputs

1

1/0

OP1

1 OP_236

2 OP_NTSC NTSC color system options: 1: Yes, 0: No 1

3 OP_AV2

4 OP-SVSH S-Video terminal: 1: Yes, 0: No 1

5 OP-DVD DVD component input: 1: Yes 1

6 OP-RGB RGB input: 1: Yes, 0: No 1

OP2

7 OP-OSO Switch off in vertical overscan 1

0 OP_AVL AVL: 1: Yes 1

AV RF output: 1: RF output (for models with SCART jack

1 OP_RFTOAV

except EX-1A)

0/1

0: Monitor output (for models with RCA jack)

2 OP_NOT_1 0

3 OP_NOT_2 0

Teletext language setting (OP-NOT-3/2/1):

1XX-English/Arabic

011-English/Farsi

010-English/Russian

4 OP_NOT_3

001-English/Ukrainian

0

000- English/Paneuro

OP_USER-LOGO User LOGO setting prior to CHANGHONG LOGO: 1:

5

6 OP_ON-BLACK

Display characters can be set by the VOL+/- buttons

Power-on auto test back selection:

1: Blue, 0: Black

7 OP_FSL Slicing level for vertical sync 0

0

0

0 OP_ENGLISH English 1

1 OP_FARSI Farsi or Czech 1

OP3

OP4

2 OP_ARABIC Arabic or Slovakian 1

3 OP_RUSSIAN Russian 1

4 OP_FRENCH French 1

5 OP_GERMAN German 1

6 OP_ITALY Italian, Indonesian or Hungarian 1

7 OP_SPANISH Spanish, Malay or Croatian 1

0 OP_FMWS Window selection of sound pll: small/large window 0

(continued)

12

OP5

SERVICE MANUAL

Memory power-on (If turned off by the remote control,

1 OP_DIRECT_SW

ITCH_ON

2 OP_HCO EHT tracking mode 1

3 OP_LOGO

4 OP_SOUND_DK Sound system-D/K option setting 1

5 OP_SOUND_BG Sound system-B/G option setting 1

6 OP_SOUND_I Sound system-I option setting 1

7 OP_SOUND_M Sound system-M option setting 1

0 OP_TUNER

OP_AUTO_LAN

1

G0

OP_AUTO_LAN

2

G1

OP_AUTO_LAN

3

G2

4 OP_FORF 1

5 OP_FORS

6 OP_AVON If AV off, then AV on 1

OP_ONPOSITIO

7

N

0 OP_AUTOTEST Auto test when power-on (set to 0 typically) 0

then the TV is turned on by the remote control; if turned

off by the MAIN POWER SWITCH, then turned on by the

MAIN POWER SWITCH.) 1: Yes

Changhong logo display

reception

Tuner: 1: Philips-Tuner

Outgoing language option setting:

(OP-AUTO-LANG2/1/0):

English (000)

Farsi (001)

Arabic (010)

Russian (011)

French (100)

German (101)

Italian or Indonesian (110)

Spanish or Malay (111)

Field frequency options (OP-FORS/FORF):

00- AUTO 60HZ, 01-KEEP LAST,

10-FORCE 60HZ, 11-AUTO 50HZ

With HOTEL mode preset, on position is fixed to POS1. 0

0-No

0: Panasonic-Tuner

1-Displayed without signal

1

0

0

0

0

0

1

OP6

1 OP_PSNS Sensitivity 0

2 OP_BSCREEN

3 OP_SECAM SECAM color system option: 1: Yes 1

4 OP_DFL Disable flash protection 1

5 OP_SIF External SIF amplifier: 1: Yes, 0: No 1

Black screen when changing channels: 1-Yes

0-No

(continued)

1

13

SERVICE MANUAL

6 OP_EXT_SIF0 1

7 OP_EXT_SIF1

Sound system options for external circuit

(OP-EXT-SIF1/0):

D/K: 00

1: Sets sound system of external SIF as the appropriate

one and also sets sound system in the course of auto

demo as the appropriate one

0: Changes sound system in the course of auto demo.

B/G: 01 I: 10 M: 11.

Notes:

Do not change the data marked with in Data column.
Check if the color/sound systems conform to the specifications of different models after setting.

0

14

SERVICE MANUAL

Tuner

A101

IF Pre-

Amplifier

+

SAWF

Analog Switc h

HEF4053

Video

Amplifier

Formed of

Microcontroller and small signal processor

UOC

CH05T0110

EEPROM
AT24C08

H.Drive

V.OUT

TDA8356J

Audio Amp lifier

TDA7056B

H.OUT

FBT

T402

Power Supply Circuit

STR-F6654 or

STR-G5653

+3.3V

+5V-1

+16V-S

+115V

CRT

AV1 IN

AV2 IN

Band 1,2

Vt,AGC

From

Antenna

IIC BUS

R

L

Speaker

110-240V~,50/60Hz

VY01-VY09

G RB

R e m o t e

Remote

Sens or

HS 0038

Circui for

B u t t o n s O n

The TV

c o n t ro l

AV OUT

Y U V

+15V

STRUCTURE AND CHASSIS FUNCTION DESCRIPTION

1. STRUCTURE BLOCK DIAGRAM

Fig.4 Structure Block Diagram for EX-1A4 Chassis Series

15

SERVICE MANUAL

Regulator

V115

N441

N442

Regulator

V871,

VD882

FBT

T400

VD491

+190V

VD451

+45V

VD461

+16V

VD471

To CRT RGB PCB

To A100,N401

To N401

+8V

+5V-2

To A100

VD891

+115V

To N600

VD881 +15V-H

VD871 +15-S

+5V-1

To H Ou t
EEPROM
R/C Input

+3.3V

To N100

Keyboard

Switch

Transformer

T804

Power Regulat ion

and Control Circuit

STR-G5653/F6654

Bridge Rectifying

Filter

VD803~VD806

C802,C807

Line Filter

L801,C801,

C802

110-240V~,50/60Hz

Feedback Circuit

N801

Error Signal

To A100,

N100,

N650

2. BLOCK DIAGRAM FOR SUPPLY VOLTAGE

Fig .5 Block Diagram for EX-1A4 Supply Voltage System

16

SERVICE MANUAL

4. CHASSIS DESCRIPTION

1). General Description

EX-1A4 chassis series are applied in 14BM19 respectively which uses mainly Philips’ advanced

2

UOC-ultimate chip TDA935X/6X/8X and I

and small signal processor, the TDA935X/6X/8X series feature high-integration,

high-performance-to-price ratio and high-reliability and advanced functions with fewer external

components, which provide much convenience for manufacturing and technical service.

2). The EX-1A4 chassis series mainly use the following ICs and assemblies.

Table 3 Key ICs and Assemblies

Serial

No.

1 N100

Position Type Function Description

CH05T0102

(TDA935X/6X/8X)

2 N200 AT24C08 EEPROM

3 N401 TDA8356/N6 Vertical scan output stage circuit

4 N402 HEF4053 Analog switch

5 N601 TDA7056B Sound power amplifier

6 N861 STR-G5653 Power supply circuit

7 A100 TDQ-5B6M Tuner

C-bus controlled IC. With combination of microcontroller

Microcontroller and small signal processor (UOC)

17

SERVICE MANUAL

SERVICE DAT A

1. KEY ICS TECHNICAL DATA

1.1 Microcontroller and small signal processor TDA935X/6X/8X

The super chips TDA935X/6X/8X are good in pins compatibility. Differences among them are

shown as follows.

TDA9351

TDA9350

TDA9361

TDA9360

TDA9380

TDA9387

TDA935X/6X/8X PS/N2 series TV signal processor-Teletext decoder with embedded -Controller

1) General Description

The various versions of theTDA935X/6X/8X PS/N2 series combine the functions of a TV signal

processor together with a -Controller and US Closed Caption decoder. Most versions have a

Teletext decoder on board. The Teletext decoder has an internal RAM memory for 1or 10 page text.

The ICs are intended to be used in economy television receivers with 90and 110picture

tubes.

The ICs have supply voltages of 8 V and 3.3 V and they are mounted in S-DIP envelope with 64

pins.

The features are given in the following feature list. The differences between the various ICs are

given in the table on page 4.

2) Features

TV-signal processor

Multi-standard vision IF circuit with alignment-free PLL demodulator

Internal (switchable) time-constant for the IF-AGC circuit

A choice can be made between versions with mono intercarrier sound FM demodulator and

versions with QSS IF amplifier.

The mono intercarrier sound versions have a selective FM-PLL demodulator which can be switched

to the different FM sound frequencies (4.5/5.5/6.0/6.5 MHz).

The quality of this system is such that the external band-pass filters can be omitted.

Source selection between ‘internal’ CVBS and external CVBS or Y/C signals

Integrated chrominance trap circuit

Integrated luminance delay line with adjustable delay time

Picture improvement features with peaking (with variable centre frequency and positive/negative

overshoot ratio) and black stretching

Integrated chroma band-pass filter with switchable centre frequency

Only one reference (12 MHz) crystal required for the

-Controller, Teletext- and the colour decoder

PAL/NTSC or multi-standard colour decoder with automatic search system

48K PAL/NTSC/SECAM+1 PAGE TELETEST

48K PAL/NTSC+1 PAGE TELETEST

64K PAL/NTSC/SECAM+10 PAGE TELETEST

64K PAL/NTSC+10 PAGE TELETEST

32K PAL/NTSC

32K NTSC

18

SERVICE MANUAL

Internal base-band delay line

RGB control circuit with ‘Continuous Cathode Calibration’, white point and black level offset

adjustment so that the colour temperature of the dark and the light parts of the screen can be

chosen independently.

Linear RGB or YUV input with fast blanking for external RGB/YUV sources. The Text/OSD signals

are internally supplied from the -Controller/Teletext decoder

Contrast reduction possibility during mixed-mode of OSD and Text signals

Horizontal synchronization with two control loops and alignment-free horizontal oscillator

Vertical count-down circuit

Vertical driver optimized for DC-coupled vertical output stages

Horizontal and vertical geometry processing

Horizontal and vertical zoom function for 16 : 9 applications

Horizontal parallelogram and bow correction for large screen picture tubes

Low-power start-up of the horizontal drive circuit

TV signal processor-Teletext decoder with embedded -Controller TDA935X/6X/8X PS/N2 series

-Controller

80C51 -controller core standard instruction set and timing

1 s machine cycle

16 - 128Kx8-bit late programmed ROM

3 - 12Kx8-bit DATA RAM (shared between Display, Acquisition and Auxiliary Ram)

Interrupt controller for individual enable/disable with two level priority

Two 16-bit Timer/Counter registers

One 16 bit Timer with 8-bit Pre-scaler

WatchDog timer

Auxiliary RAM page pointer

16-bit Data pointer

Stand-by, Idle and Power Down (PD) mode

14 bits PWM for Voltage Synthesis Tuning

8-bit A/D converter

4 pins which can be programmed as general I/O pin, ADC input or PWM (6-bit) output

Data Capture

Text memory for 0, 1 or 10 pages

In the 10 page versions 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 optimized -processor

throughput

Automatic detection of FASTEXT transmission

Real-time packet 26 engine in Hardware for processing accented, G2 and G3 characters

19

SERVICE MANUAL

Signal quality detector for video and WST/VPS data types

Comprehensive teletext language coverage

Full Field and Vertical Blanking Interval (VBI) data capture of WST data

Display

Teletext and Enhanced OSD modes

Features of level 1.5 WST and US Close Caption

Serial and Parallel Display Attributes

Single/Double/Quadruple Width and Height for characters

Scrolling of display region

Variable flash rate controlled by software

Enhanced display features including overlining, underlining and italics

Soft colours using CLUT with 4096 colour palette

Globally selectable scan lines per row (9/10/13/16) and character matrix [12x10, 12x13, 12x16

(VxH)]

Fringing (Shadow) selectable from N-S-E-W direction

Fringe colour selectable

Meshing of defined area

Contrast reduction of defined area

Cursor

Special Graphics Characters with two planes, allowing four colours per character

32 software redefinable On-Screen display characters

4 WST Character sets (G0/G2) in single device (e.g. Latin, Cyrillic, Greek, Arabic)

G1 Mosaic graphics, Limited G3 Line drawing characters

WST Character sets and Closed Caption Character set in single device

Functional Difference Between The Various IC Versions
IC Version (TDA) 9350 9351 9352 9353 9360 9361 9362 9363 93 64 9365 93 66 9367 9380 9 381 9 382
9383 9384 9385 9386 9387 9388 9389

Table 4

20

3) Block Diagram

g

g

SERVICE MANUAL

ram for TDA935×/6×8×PS/N2 with Mono Intercarrier Sound Demodulator

.6 Block Dia
Fi

21

SERVICE MANUAL

Fig.7 Block Diagram for TDA935×/6×8×PS/N2 with QSS IF Sound Channel

22

SERVICE MANUAL

4) pinning

Table 5

SYMBOL PIN DESCRIPTION

P1.3/T1 1 port 1.3 or Counter/Timer 1 input
P1.6/SCL 2 port 1.6 or I2C-bus clock line
P1.7/SDA 3 port 1.7 or I2C-bus data line
P2.0/TPWM 4 port 2.0 or Tuning PWM output
P3.0/ADCO/PWMO 5 port 3.0 or ADC0 input or PWM0 output
P3.1/ADC1/PWM1 6 port 3.1 or ADC1 input or PWM1 output
P3.2/ADC1/PWM2 7 port 3.2 or ADC2 input or PWM2 output
P3.3/ADC3/PWM3 8 port 3.3 or ADC3 input or PWM3 output
VSSC/P 9 digital ground for -Controller core and periphery
P0.5 10 port 0.5 (8mA current sinking capability for direct drive of LEDs)
P0.6 11 port 0.6 (8mA current sinking capability for direct drive of LEDs)
VSSA 12 analog ground of Teletext decoder and digital ground of TV-processor
SECPLL 13 SECAM PLL decoupling
VP2 14 2nd supply voltage TV-processor (+8V)
DECDIG 15 decoupling digital supply of TV-processor
PH2LF 16 phase-2 filter
PH1LF 17 phase-1 filter
GND3 18 ground 3 for TV-processor
DECBG 19 bandgap decoupling
AVL/EWD

(1)

20 Automatic Volume Levelling/East-West drive output
VDRB 21 vertical drive B output
VDRA 22 vertical drive A output
IFIN1 23 IF input 1
IFIN2 24 IF input 2
IREF 25 reference current input
VSC 26 vertical sawtooth capacitor
TUNERAGC 27 tuner AGC output
AUDEEM/SIFIN1
DECSDEM/SIFIN2
GND2 30 ground 2 for TV processor
SNDPLL/SIFAGC
AVL/SNDIF/REFO/
AMOUT

(1)

(1)

28 audio deemphasis or SIF input 1

(1)

29 decoupling sound demodulator or SIF input2

(1)

31 narrow band PLL filter/AGC sound IF

Automatic Volume Levelling/sound IF input/subcarrier reference

32

output/AM output
HOUT 33 (non controlled)
FBISO 34 horizontal output
AUDEXT/
QSSO/AMOUT
EHTO

(1)

flyback input/sand castle output

35

external audio input/QSS intercarrier out/AM audio output (non

36

controlled)
PLLIF 37 EHT/overvoltage protection input
IFVO/SVO 38 IF-PLL loop filter
VP1 39 IF video output/selected CVBS output
CVBSINT 40 main supply voltage TV-processor (+8V)
GND1 41 internal CVBS input
CVBS/Y 42 ground 1 for TV-processor
CHROMA 43 external CVBS/Y input
AUDOUT/AMOUT

(1)

44 chrominance input (SVHS)
INSSW2 45 2nd RGB/YUV insertion input
R2/VIN 46 2nd R input/V (R-Y) input
G2/YIN 47 2nd G input/U input

23

SERVICE MANUAL

SYMBOL PIN DESCRIPTION

B2/UIN 48 2nd B input/U (B-Y) input
BCLIN 49 beam current limiter input/(V-guard input, note2)
BLKIN 50 black current input/(V-guard input, note2)
RO 51 Red output
GO 52 Green output
BO 53 Blue output
VDDA

analog supply of Teletext decoder and digital supply of TV-processor

54

(3.3V)
VPE 55 OTP programming Voltage
VDDC 56 digital supply to core (3.3V)
OSCGND 57 oscillator ground supply
XTALIN 58 crystal oscillator input
XTALOUT 59 crystal oscillator output
RESET 60 reset
VDDP 61 digital supply to periphery (+3.3V)
P1.0/INT1 62 port 1.0 or external interrupt 1 input
P1.1/TO 63 port 1.1 or Counter/Timer 0 input
P1.2/INTO 64 port 1.2 or external interrupt 0 input

Notes

1)The function of pin 20, 28, 29, 31, 32, 35 and 44 is dependent on the IC version (mono intercarrier

FM demodulator/QSS IF amplifier and East-West output or not) and on some software control bits.

The valid combinations are given in table 5.

Table 6 Pin functions for various versions

IC version FM-PLL Version QSS Version

East-West

Y/N

CMB1/CM

BO bits

AM bit - - - - - 0 1 - 0 1

Pin 20 AVL EWD AVL EWD

Pin 28 AUDEEM SIFIN1

Pin 29 DECSDEM SIFIN2

Pin 31 SNDPLL SIFAGC

Pin 32 SNDIR

Pin 35 AUDEXT AUDEXT QSSO AMOUT AUDEXT QSSO AMOUT

Pin44 AUDOUT Controlled AM or audio out

N Y N Y

00 01/10/11 00 01/10/11 00 01/10/11 00 01/10/11

(1)

REFO

(2)

AVL/SNDIF

(1)

REFO

(2)

AMOUT REFO

(2)

AMOUT REFO

(2)

Notes

1)When additional(external) selectivity is required for FM-PLL system pin 32 can be used as sound IF

input. This function is selected by means of SIF bit in subaddress 28H.

2)The reference output signal is only available for the CMB1/CMBO setting of 0/1. For the other setings

this pin is a switch output.

24

SERVICE MANUAL

Fig.8 Pin Configuration (SDIP 64)

25

SERVICE MANUAL

1.2 EEPROM AT24C08

1) Features

Data EEPROM internally organized as 1024/2048
bytes and 64/128 pages×16 bytes
Page protection mode, flexible page-by-page
hardware write protection

-Additional protection EEPROM of 64/128 bits,
bit per data page
1-Protection setting for each data page by writing its
protection bit

-Protection management without switching WP pin
Low power CMOS
Vcc=2.7 to 5.5V operation
Two wire serial interface bus, I2C-Bus compatible
Filtered inputs for noise suppression with Schmitt

trigger

Clock frequency up to 400 kHz
High programming flexibility

-Internal programming voltage Fig. 9

-Self timed programming cycle including erase

-Byte-write and page-write programming, between 1 and 16 bytes

-Typical programming time 6ms(<10ms) for up to 16 bytes
High reliability

-Endurance 10

-Data retention 40 years

-ESD protection 4000 V on all pins
8 pin DIP/DSO packages
Available for extended temperature ranges

-Industrial: -40

-Automotive: -40

3) Block Diagram

6

cycles

1)

1)

to +85
to +125

2) Pin Configuration

Fig. 10

26

SERVICE MANUAL

1.3 Vertical scan output stage circuit TDA8356/N6

DC-coupled vertical deflection circuit TDA8356

1) Features

Few external components

Highly efficient fully DC-coupled vertical output bridge circuit

Vertical flyback switch

Guard circuit

Protection against:

Short-circuit of the output pins (7 and 4)

Short-circuit of the output pins to VP.

Temperature protection

High EMC immunity because of common mode inputs

A guard signal in zoom mode.

2) General Description

The TDA8356 is a power circuit for use in 90, and 110, colour deflection systems for field frequencies of

50 to 120 Hz. The circuit provides a DC driven vertical deflection output circuit, operating as a highly

efficient class G system.

3) Block Diagram 4) Pinning

Fig.11

Table 7

Symbol Pin Description

Idrive(pos) 1 input power-stage (positive); includes II(sb) signal bias
Idrive(neg) 2 input power-stage (negative); includes II(sb) signal bias
VP 3 operating supply voltage
VO(B) 4 output voltage B
GND 5 ground
VFB 6 input flyback supply voltage
VO(A) 7 output voltage A
VO(guard) 8 guard output voltage
VI(fb) 9 input feedback voltage

27

Fig.12

SERVICE MANUAL

1.4 Electronic switch circuit HEF4053

Triple 2-channel Analog
Multiplexer/Demultiplexer

1). Description

The HEF4053 is a triple 2-channel analog

multiplexer/demultiplexer with a common enable

). Each multiplexer/demultiplexer has two

E

input (
indepen-

dent inputs/outputs (Y

and Y1), a common

0

input/output (Z), and select inputs (Sn). Each also

contains two-bidirectional analog switches, each

with one side connected to an independent

input/output (Y

and Y1) and the other side

0

connected to a common input/output (Z).

With (

E ) LOW, one of the two switches is selected

2). Block Diagram

Fig.13 Functional Diagram

(low impedance ON-state) by Sn. With

E

HIGH, all switches are in the high impedance

OFF-state, independent of S

and VSS are the supply voltage connections

V

DD

for the digital control inputs (S
The V

inputs/outputs (Y

between V

negative limit. V

to VSS range is 3 to 15V.The analog

DD

, Y1 and Z) can swing

0

as a positive limit and VEE as a

DD

may not exceed 15 V.

DD-VEE

to SC.

A

to SC and E).

A

For operation as a digital

multiplexer/demultiplexer, V

(typically ground).

V

SS

is connected to

EE

28

SERVICE MANUAL

Fig. 14 Pinning Diagram

HEF4053P(N): 16-lead DIL; plastic

(SOT38-1)

HEF4053D(F): 16-lead DIL; ceramic

(cerdip)

(SOT74)

HEF4053T(D): 16-lead S0; plastic

(SOT109-1)

(): Package Designator North America

Pinning

to Y0C

Y

0A

Y

1A to Y1C

S

A

Independent inputs/outputs

to Sc Select inputs

E

to ZC Common inputs/outputs

Z

A

Independent inputs/outputs

Enable input (active LOW)

3. Function Table
Inputs Channel
E Sn On

L L Y

L H Y

0n-Zn

1n-Zn

H X none

Notes

H=HIGH state (the more positive voltage)

L=LOW state (the less positive voltage)

X=STATE is immaterial

Fig. 21 Schematic Diagram (One Switch)

Fig 15

Ratings

Limiting values in accordance with the Absolute Maximum System (IEC 134)

Supply voltage (with reference to V

) VEE -18 to + 0,5 V

DD

Note

To avoid drawing V

current out of terminal Z, when switch current flows into terminals Y, the voltage

DD

drop across the bidirecctional switch must not exceed 0, 4 V. If the switch current flows into terminal

Z, no V

the switch, but the voltages at Y and Z may not exceed V

current will flow out of terminals Y, in this case there is no limit for the voltage drop across

DD

DD

or V

EE.

29

SERVICE MANUAL

r

A

r

1.5 5 W Mono BTL Audio Amplifier with DC Volume Control TDA7056B

(1) Features

· DC volume control

· Few external components

· Mute mode

· Thermal protection

· Short-circuit proof

· No switch-on and switch-off clicks

· Good overall stability

· Low power consumption

· Low HF radiation

· ESD protected on all pins.

(3) Block Diagram

(4) Pinning

Table 8

Symbol Pin Description
n.c. 1 Not connected
VP 2 Positive supply voltage
VI 3 Voltage input
GND1 4 Signal ground
VC 5 DC volume control
OUT+ 6 Positive output
GND2 7 Power ground
OUT- 8 Negative output
n.c. 9 Not connected

(2) General Description

The TDA7056B is a mono Bridge-Tied Load (BTL)
output amplifier with DC volume control.
It is designed for use in TV and monitors, but is also
suitable for battery-fed portable recorders and radios.
The device is contained in a 9-pin medium powe
package.

Missing Current Limiter (MCL) is built in. The MCL
circuit is activated when the difference in current
between the output terminal of each amplifier exceeds
100 mA (300 mA typ.). This level of 100 mA allows fo
headphone applications (single-ended).

Fig. 16 Block Diagram.

Fig.17 Pin Configuration.

30

SERVICE MANUAL

1.6 Power module STR-G5653/6454R

Switch-mode Power Supply STR- G5653/F6654

The Series STR-G5653/F6654 is specifically designed to satisfy the requirements for increased

integration and reliability in off-line quasi-resonant flyback converters. The series incorporates a

high-precise error amplifying control and drive circuit with discrete avalanche-rated power MOSFET,

featuring fewer external components, small-size and standard power supply.

Covering the power range from below 25 watts up to 300 watts for 100/115/230 VAC inputs, and up to

150 watts for 85 to 265 VAC universal input, these devices can be used in a range of applications,

from battery chargers and set top boxes, to televisions, monitors, and industrial power supply units.

Cycle-by-cycle current limiting, under-voltage lockout with hysteresis, over-voltage protection, and

thermal shutdown protects the power supply during the normal overload and fault conditions.

Low-current startup and a low-power standby mode selected from the secondary circuit completes

a comprehensive suite of features. The series is provided in a five-pin overmolded SIP style package,

affording dielectric isolation without compromising thermal characteristics.

1) Features

Flyback Operation with Quasi-Resonant Soft Switching for Low Power Dissipation and EMI

Rugged Avalanche-Rated MOSFET

Soft drive circuit MOSFET

Adjustable MOSFET switching speed

Choice of MOSFET Voltage and rDS(on)

Full Over-Current Protection (no blanking)

Under-Voltage Lockout with Hysteresis

Over-Voltage Protection

Direct Voltage Feedback

Low Start-up Current (100 Amax)

Low-Frequency, Low-Power Standby Operation

Overmolded 5-Pin Package

2). Circuit Block Diagram

Fig. 18

31

SERVICE MANUAL

3). Pin Configuration and Functions

Fig. 19

Table 9 Pin function for STR-G5653

Pin No. Symbol Function Description

1 D MOSFET drain

2 S MOSFET source

3 GND Ground

4 VIN Supply voltage input for control circuit

5 OCP/FB Over-current protection detection signal/ voltage-limiting signal input

Table 10 Pin function for STR-F6654

Pin No. Symbol Function Description

1 OCP/FB Over-current protection detection signal/ voltage-limiting signal input

2 S MOSFET source

3 D MOSFET drain

4 VIN Supply voltage input for control circuit

5 GND Ground

4). Difference between STR-G5653 and STR-F6654

a. Different size: STR- F6654 is larger

b. Different pin functions

c. Different electric characteristics: Larger power output, switching current, avalanche-rated and

internal allowable power consumption for STR-F6654

d. internal allowable power consumption for STR-F6654

32

SERVICE MANUAL

2. WAVEFORMS OF KEY POINTS

NI00

Pin58

NI00

Pin34

NI00

Pin33

NI00

Pin44

NI00

Pin22

BU250

8DX-B

NI00

Pin21

BSC60H

-HEAT

33

SERVICE MANUAL

BCT-4

Pin4

Notes:

The waveforms are only for reference.
The waveforms may differ dependent on different models.

N100

-P40

34

SERVICE MANUAL

3. KEY ICS SERVICE DATA

Table 11 Function and Service Data of TDA9351PS/N2/3I (N100)’s Pins

Digital Multimeter : Victor DT890D

Pin

No.

1 P1.3/T1 3.8 9.5 9.5

2 P1.6/SCL 3.4 6.8 6.8

3 P1.7/SDA 3.0 6.8 6.8

4 P2.0/TPWM 1.8 36.2 17.9

5 P3.0/ADC0/PWM0 0.1 11.8 12.3

6 P3.1/ADC1/PWM1 0.1 5.0 5.0

7 P3.2/ADC2/PWM2 0.02 13.5 13.5

8 P3.3/ADC3/PWM3 0.7 10.7 9.3

9 VSSC/P 0 0 0

10 P0.5 0.01 13.3 13.3

11 P0.6 4.2 11.6 11.0

12 VSSA 0 0 0

13 SECPLL 2.3 27.6 21.7

14 VP2 8.0 1.8 1.8

15 DECDIG 5.0 23.1 16.1

16 PH2LF 3.2 27.5 `21.0

17 PH1LF 3.9 27.9 21.2

18 GND3 0 0 0

19 DECBG 4.0 24.4 18.7

20 AVL/EWD (1) 0.01 27.6 21.2

21 VDRA 2.4 27.6 20.4

22 IFIN1 2.4 27.6 20.3

23 IFIN2 1.8 24.7 19.8

24 IREF 1.8 24.7 19.9

25 TUNERAGC 3.8 25.3 20.5

26 AUDEEM/SIFIN1(1) 3.8 27.7 21.5

27 DECSDEM/SIFIN2(1) 1.6 8.4 8.4

28 GND2 3.2 27.1 20.7

29 VSSA 2.3 27.8 21.6

30 SECPLL 0 0 0

31 SNDPLL/SIFAGC(1) 2.3 27.8 21.8

32 AVL/SNDIF/REF0/AMOUT(1) 0.2 27.2 20.4

33 HOUT 0.4 5.3 5.3

34 FBISO 0.5 24.0 18.8

Symbol

Reference
Voltage (V)

Positive
Resistance

)

(K

Nerative
Resistance
(K )

(continued)

35

SERVICE MANUAL

35 AUDEXT/QSSO/AMOUT(1) 3.7 27.8 21.5

36 AUDEXT/ 1.6 18.7 16.0

37 QSSO/AMOUT(1) 2.4 27.8 21.5

38 AUDEXT/ 3.3 24.0 21.1

39 QSSO/AMOUT(1) 7.7 1.8 1.8

40 AUDEXT/ 3.8 27.5 21.2

41 GND1 0 0 0

42 CVBS/Y 3.3 27.5 21.2

43 CHROMA 1.4 26.8 20.9

44 AUDOUT /AMOUT(1) 3.3 27.5 21.5

45 INSSW2 1.6 1.0 1.0

46 R2/VIN 2.6 28.0 21.7

47 G2/YIN 2.6 28.0 21.7

48 B2/UIN 2.6 28.0 21.7

49 BCLIN 2.5 27.6 20.8

50 BLKIN 6.0 27.9 21.3

51 RO 2.6 1.1 1.1

52 GO 2.5 1.1 1.1

53 BO 2.4 1.1 1.1

54 VDDA 3.2 11.0 11.3

55 VPE 0 0 0

56 VDDC 3.2 11.0 11.3

57 OSCGND 0.02 - -

58 XTALIN - - -

59 XTALOUT - - -

60 RESET 0 0 0

61 VDDP 3.2 11.0 11.3

62 P1.0/INT1 0 - -

63 P1.1/T0 1.5 3.3 3.3

64 P1.2/INT0 5.0 18.2 17.5

Table 12 Functions and Service Data of AT24C08 (N200)’s Pins

No.

1 Address input 0.00 0.00 0.00
2 Address input 0.00 0.00 0.00
3 Address input 0.00 0.00 0.00
4 Common ground 0.00 0.00 0.00
5 Clock line 4.94 6.85 4.83
6 Data line 4.94 6.89 5.15
7 PW write protect 4.94 9.58 6.31
8 Supply voltage 4.94 3.5 3.25

Function Description

Reference Voltage (V) Positive Resistance (20K )

36

Digital Multimeter Pin

Negative Resistance (20K )

SERVICE MANUAL

Table 13 Function and Service Data of TDA8356 (N401)’s Pins

Digital Multimeter : Victor DT890D

Positive

Resistance

)

(K

Nerative

Resistance

(K )

2.4 27.7 20.3

2.4 27.7 20.4.

15.4 26.3 13.5

7.7 6.1 6.1
0 0 0

45.0 113.3 13.7

7.5 6.1 6.1

0.2 10.0 9.7.

7.7 6.1 6.1

Pin

No.

1
2
3
4
5
6
7
8
9

Idrive (pos)
Idrive (neg)
VP
VO (B)
GND
VFB
VO (A)
VO(guard)
VI(fb)

Symbol

Reference

Voltage (V)

Table 14 Function and Service Data of HEF4053BP (N402)’s Pins

Pin

No.

Function description

Digital Multimeter : Victor DT890D

Reference
Voltage (V)

Positive
Resistance
(K

)

Nerative
Resistance

(K )
1 Signal input 3.0 22.2 47.0
2 Signal input 3.9 22.2 47.0.
3 Signal input 1.3 21.2 40.0
4 Signal output 2.5 0 0
5 Signal input 2.4 - ­6 Ground 0 0 0
7 Ground 0 0 0
8 Ground 0 0 0.
9 Control signal input 0.03 13.5 13.1
10 Control signal input 0.03 13.5 13.1
11 Control signal input 0.03 13.5 13.1
12 Signal input 3.9 22.2 47.0
13 Signal output 0.7 22.2 47.0
14 Signal input 3.9 21.9 26.0
15 Audio output 3.9 21.9 26.0
16 Supply voltage 7.8 0 0

37

SERVICE MANUAL

Table 15 Function and Service Data of TDA7056B (N601)’s Pins

No.

1 Not connected 0

2 Positive supply voltage 16 0.4 0.4

3 Voltage input 2 7.4 33

4 Signal ground 0 0 0

5 DC volume control 0 7 9

6 Positive output 8 6 7.4

7 Power ground 0 0 0

8 Negative output 8 6 7.4

9 Not connected 0

Function Description

Reference Voltage (V)

Digital Multimeter Pin

Positive Resistance (20K )

Negative Resistance (20K )

Notes:

The data are only for reference.
The data sheet may differ dependent on different models.

38

SERVICE MANUAL

4. REPLACEMENT OF PARTS

4.1 Description

Many electrical and mechanical components in this chassis have special safety-related

characteristics. Components which have these special safety characteristics in this manual and its

supplements are identified by the international hazard symbols or UL, FCC, FDA or VDE marking

on the circuit diagram and parts list. When replacing any of these components, substitute the one

which has the same safety characteristics as specified in the manual.

Description of the special markings:

A: The components identified by the A marking have special safety-related characteristics.
AE: The components identified by the AE marking are listed by EMC and have special safety-related

characteristics.

CB: The components identified by the CB marking have been evaluated to the CB standard.
E: The components identified by the E marking are listed by EMC
G: The components identified by the G marking have critical characteristics.
Z: The components identified by the Z marking have important characteristics.

Note:

Models and specifications of components in this table may be somewhat different with your unit. In this

case, please rely on the actual unit.

39

CIRCUIT DIAGRAM FOR 14BM19

MAIN PCB

CRT RGB PCB

(For IRICO CRT only)

(For BMCC CRT or Indonesia-based LG CRT or THAI CRT or Chunghwa CRT only)

Final Assembly Diagram for 14BM19

22

1111

1010

1818

11

99

44

55

1717

1414

33

1313

66

88

1212

1616

400mm400mm

99

2929

2828

2727
2626

2525

2424

2323

2222

2121

JUT8.849.001JUT8.849.001

2020

1919

JU8.812.008JU8.812.008

1818

1717
1616

1515
1414
1313
1212

1111

1010

T/JU8.942.249T/JU8.942.249 WasherWasher

99

T/JU8.667.003T/JU8.667.003

88

JUC8.667.011JUC8.667.011

77

T/JU8.667.328T/JU8.667.328

66

55
44

33
22

11

SerialSerial

Code No.Code No.

No.No.

white nitro magnetic paint Q04-3white nitro magnetic paint Q04-3
NANDA 87 glueNANDA 87 glue
Hot-melt adhesiveHot-melt adhesive

Rubber padRubber pad
Fragile labelFragile label
Static labelStatic label
Blue protection tapesBlue protection tapes
Protection matsProtection mats
Serial No. bar codeSerial No. bar code

QA passQA pass

M5 notched washer nutM5 notched washer nut

Tapping screw 4X20BAHChTapping screw 4X20BAHCh

Tapping screw 3X12VwAHChTapping screw 3X12VwAHCh

Wire clip XJ-100Wire clip XJ-100
Warning labelWarning label
Rear plateRear plate

AV plateAV plate
WasherWasherT/JU8.949.224T/JU8.949.224

Distance clipDistance clip

Wire clip AWire clip A
Wire clip Wire clip
Cover boardCover board
Back coverBack cover

CRT RGB PCB assemblyCRT RGB PCB assembly
Main PCB assemblyMain PCB assembly

Front Cover AssemblyFront Cover Assembly

CRT assemblyCRT assembly

PartsParts RemarksRemarksQtyQty

11
11
11

44

two copies of labeltwo copies of label

11
11

44
44
33
11
11
11

11
44
44
11
11
11

11
11

11
11

11

11

4X10mm4X10mm

Final Wiring Diagram for 14BM19

Side-set AV PCB Assembly

-

+

Wired Connector XS161A

XP601

XS800

XS202

Wired Connector XS402

Wired Connector XPY01

JUC6.604.1019

Wired Connector XS161

Remote Sensor PCB assembly

XP320

XS320

XS200

W01.000;XPY03

W01.000;1

W01.000;4

C909

W01.000;6

CRT's Ground Wire

GND

W01.000;XSY01

Soldered

Wired Connector XS402

Wired Connector XS501

XS500

A Wire (Red)

+

-

To Deflection Yoke

XSA04A

XSA05A

B Wire (Grey)

XSY03

Infrared Sensor PCB Assembly

Coil

From Power Switch Assembly

To Degaussing