Xoceco TJ306, IS-TVHD30 Schematic

COLOR TELEVISION

IS-TVHD30

(TJ306)

CONTENTS

Safety precautions………………………………………………………………………..… Alignment instructions. ………………………………….………..…………………….… Working principle analysis of the unit……………………………….………….…………. Block diagram………………………………….. ……………………………………….………… IC block diagram………………………………………………………………………..…… Wiring diagram ……………………………………………………………..……………... Troubleshooting……………………………………………………………………………..…… Schematic diagram. ………………………………………………………………………..

APPENDIX: EXPLODED VIEW PART LIST

1 3 10 11 12 18 19 21

Attention: This service manual is only for service personnel to take reference with. Before

servicing please read the following points caref ully.

Safety precautions

After the original ser vice problem has been corrected, a check should be made of the following:

FIRE & SHOCK HAZARD

1. Be sure that all components are positioned in such a way as to avoid possibility of adjacent component shorts. This is especially important on those chassis, which are transported to and from the repair shop.

2. Never release a repair unless all protective devices such as insulators, barriers, covers, shields, strain reliefs, and other har dware have been reinstalled per or iginal design.

3. Soldering must be inspected to discover possible cold solder joints, frayed leads, damaged insulation (including A.C. cord), solder splashes or sharp solder points. Be certain to remove all loose foreign particles.

4. Check for physical evidence of damage or deterioration to parts and components, and replace if necessary follow original layout, lead length and dress.

5. No leads or components should touch a receiving tube or a resistor rated at 1 watt or more. Lead tension around protruding metal sur faces must be avoided.

6. All critical components such as fuses, flameproof resistors, capacitors, etc. must be replaced with exact factory types. Do not use replacement components other than those specified or make unrecompensed circuit modifications.

7. After re-assembly of the set always perform an A.C. leakage test on all exposed metallic parts of the cabinet, (the channel selector knob, antenna terminals, handle and screws) to be sure the set is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this test. Use an A.C. voltmeter, having 5000 ohms per volt or more sensitivity, in the following manner: connect a 1500ohm 10watt resistor, paralleled by a 0.15uF. 150V A.C. type capacitor between a known good earth ground 9water pipe, conduit, etc. and the exposed metallic parts, one at a time. Measure the A.C. voltage across the combination of 1500ohm resistor and 0.15uF capacitor. Reverse the A.C. plug and repeat A.C. voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts R.M.S. This corresponds to 0.5 milliamp A.C. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

GRAPHIC SYMBOLS:

It is intended to alert the service personnel to the presence of uninsulated dangerous voltage that may be of sufficiently magnitude to constitute a risk of electric shock.

It is intended to alert the service personnel to the presence of important safety information in service literatur e.

X-RADIATION

Too excessive voltage will cause harmful X-ray. To avoid this radiation hazard, the high voltage should fall within the limitation. The appliance works at AC 120V, 60Hz. The high voltage of zero

beam current should be within 35KV on condition that the main power(B+) voltage is DC140V . And it should not exceed 36KV in any condition.

1. Be sure procedures and instructions to all service personnel cover the su bject of X-rays in cur rent TV is the picture tube. However, this tube does not emit X-rays when the high voltage is at the factory specified level. The proper value is given in the applicable schematic. Operation at higher voltages may cause a failure of the picture tube or high voltage supply and, under certain circumstances, may produce radiation in excess of desirable levels.

2. Only factory specified C.R.T. anode connectors must be used. Degaussing shields also serve as X-ray shield in color sets. Always re-install them.

3. It is essential that the serviceman has available an accurate and reliable high voltage meter. The calibration of the meter should be checked periodically against a reference standard. Such as the one available at your distributor.

4. When the high voltage circuitry is operating properly there is no possibility of an X-radiation problem. Every time a color chassis is serviced, the brightness should be run up and down while monitoring the high voltage with a meter to be certain that the high voltage does not exceed the specified value and that it is regulating correctly. We suggest that you and your service or ganization review test procedures so that voltage regulation is always checked as a standard servicing procedure. And that the high voltage reading be recorded on each customer s invoice.

5. When troubleshooting and making test measurements in a receiver with a problem of excessive high voltage, avoid being unnecessarily close to the picture tube and the h i gh v oltage compartment. Do not operate the chassis longer than is necessary to locat e t he cause of excessive voltage.

6. Refer to HV, B+ and Shutdown adjustment procedures described in the appropriate schematic and diagrams. Too excessive voltage will cause harmful X-r ay.

IMPLOSION

1. All direct viewed picture tubes are equipped with an integral implosion protection system, but care should be taken to avoid damage during installation. Avoid scratching the tube. If scratched, replace it.

2. Use only recommended factory replacement tubes.

TIPS ON PROPER INSTALLATION

1. Never install any receiver in closed-in recess, cubbyhole or closely fitting shelf space over, or close to heat duct, or in the path of heated airflow.

2. Avoid conditions of high humidity such as: Outdoor patio installations where dew is a factor. Near steam radiators where steam leakage is a factor, etc.

3. Avoid placement where draperies may obstruct rear venting. The customer should also avoid the use of decorative scarves or other coverings which might obstruct ventilat ion.

4. Wall and shelf mounted installations using a commercial mounting kit, must follow the factory approved mounting instructions. A receiver mounted to a shelf or platform must retain its original feet(or the equivalent thickness in spacers) to provide adequate are flow across the bottom, blots or screws used for fasteners must not touch and parts or wiring. Perform leakage test on customized installations.

5. Caution customers against the mounting of a receiver on sloping shelf or a tilted position, unless the receiver is properly secured.

6. A receiver on a roll-about cart should be stable on its mounting to the cart. Caution the customer on the hazards of trying to roll a cart with small caster s acr oss t hresholds or deep pile carpets.

Alignment instructions

1. General instructions

1.1 The program data should be copied into the EEPROM (N802 M24C16) in this set according to Standard Sample program data, then execute “Factory Adjustment”. If adopt empty EEPROM, please preset I2C datum before any debugging.

1.2 If ther e is no special not ice, the unit adjustment should be done on the following conditions: a. AC power 120V/60Hz. b. Pre-heat the set for above 30 minutes.

1.3 There is a auto-degaussing circuit inside which could degauss the set automatically within one second after turn on the power. The auto-degaussing circuit eff ects on condition that every interval of turning on the set is longer than 30 minutes at least.

1.4 The magnetized CRT will influence the colour pur ity and focus. When the inside degaussing circuit can’t degauss thoroughly then an outside degausser is necessary. Colour purity and focus adjustment should be executed according to the colour purity and focus adjusts procedures if the colour purity and focus is not good.

2. Alignment items and procedure

a) B+ voltage check b) OSD character center adjustment c) AFT and RFAGC voltage adjustment d) Focus adjustment e) Screen-grid voltage adjustment f) White balance adj ust ment g) Horizontal and vertical scanning centre and amplitude adjustment h) Raster correction adjustment i) HDTV white balance adjustment j) HDTV Horizontal and vertical scanning centre and amplitude adjustment k) HDTV raster correction adjustment

Adjustment flow-chat is shown as Fig-1

E2PROM copy

High voltage check

B+ voltage

OSD position

AFT adjustment

AGC adjustment

Focus

Screen-grid voltage and w hite

balance adjustment

Centre of scanning amplitude and

raster adjustment

X-ray protection check

Filament voltage

SELF CHECK

Picture parts

Sub-brightness

White balance

Colour purity and convergence

Stereo check

Video/S-VHS/DVD

Check

Auto adjustment

The unit and remote Control function

Fig-1 Adjustment flow-chart

3. Factory mode adjustment

3.1 Enter factory mode adjustm ent Press the “factory menu” butt on on t he r emote control, the screen display the factory menu.

3.2 factory menu operation method Press the channel +/- button to selection the sub menu of factory menu, and press the vol+/- to enter the sub menu or setting t he value.

3.3 exit the factory menu Press the MENU button again and again; it can exit the factory menu.

4. Adjustment methods

4.1 B+ voltage adjustment a. Be sure the voltage AC 120V/60Hz. b. Connect the digital voltmeter to TP3 and GND of B+ test point, input the US-7 signal, set the

picture control to “standard”, adjust RP501 to let the B+(test point) voltage 140V+/ - 0.3V

c. In the STAND BY t urn off, B+ voltage about 20V

4.2 OSD position adjustment In the factory menu, select SYS SETTING sub menu, adjust OSD H-POS item, let the character position to screen display center.

4.3 AFT adjustment a. IF of tuner (TUNER101) output and TP6 are separate. b. Input 45.75MHz of frequency and 90db of amplitude signals to TP6 c. Adjust the tunable inductance L110, and measure between the TP4 and GND voltage, until the

TP4 voltage to be 2.5V.

d. Output pin IF of TUNER101 and TP6 bonding pad is normal.

4.4 AGC voltage adjustment a. Receive 60db split field signal b. Adjust the potentiometer RP101, and measure the TP5 to GND voltage, until the voltage of TP5

to be 3.5V, then noise wave of the picture point disappears.

4.5 focus adjustment a. Receive A28 signal, set the picture mode to standar d. b. Adjust focus potentiometer of FBT, until the B area display best.

4.6 Screen-grid voltage and white balance adjustment a. Receive US-7 split field signal, the picture mode to “warm”. b. In the factory menu, select the W HITE BALANCE SETTING menu, fixed the CUT OFF R and

adjust the CUT OFF G and the CUT OFF B, until the white balance is norma l.

c. Select t he color and contrast to 0, select the brightness to 50 in the user menu. In the factory

menu, select the LUMINANCE SETTING menu; adjust the Brightness min, until the back level voltage about 180V. Adjust the SCREEN potentiometer, until rightmost of gray of the US-7 picture up and down separate.

d. Select the color to 0, the brightness to 50 and the contrast to 100 in the user menu, adjust the

Contrast max, until the eight level g r ay amplit ude Vp-p to 100V.

e. Select the color to 0, the brightness and the contrast to 100 in the user menu, adjust the

BRIGHTNESS max, until low right back color of the D-8 picture does not white.

f. In the factory menu, select the WHITE BALANCE SETTING sub menu; adjust the white balance

(color temperature to 12000K+/-8MPCD, the color coordinate to 0.270+/-0.008, 0.283+/-0.008).

4.7 Horizontal and vertical scanning centre adjustment of TV

4.7.1 Horizontal center adjustment Receive A6 signal, the picture mode to “STANDARD” in the factory menu, select Hor izontal

setting menu, adjust the H PO S, until the picture H-center and screen center accor d.

4.7.2 Vertical center adjustment Receive A6 signal, the picture mode to “STANDARD” in the factory menu, select Vertical

setting menu, adjust the V PO S, until the picture V-center and screen center accord.

4.8 Vertical scanning adjustment Receive A12 signal, the picture mode to “STANDARD” in the factory menu, select Vertical setting

menu, adjust the V SIZE, until up and down over scanning of the picture to 8% of the all screen.

4.9 Raster correction and horizontal amplitude adjust ment of TV Receive white grid of NTSC signal, the picture mode to “STANDARD” in the factory menu, select horizontal setting menu, adjust the PCC, until the raster distort least, adjust the H SIZE, until r ight and left over scanning of the picture to 8% of the all screen.

4.10 If the scanning line distortion and raster geometric distortion dissatisfy condition, you can adjust the factory menu item

SCOR CCOR PCAC PCC KEYST PARAL TCC BCC

4.11 O ut put the max sound of power

Receive the US-7 signal; adjust the volume to max, check the sound power output no less than 2 x 6W.

4.12 White balance and Horizontal and vertical scanning centre and amplitude adjustment of HDTV

The unit has the YPBPR terminal; it can display the HDTV signal Support the HDTV and TIMING of the VG848 format.

When th e whit e bal anc e adj u stm ent , t he pi ct ure m od e to STANDARD in t he u ser mo de. W hen The H-V scanning adjustment, set the H-CENTER, H-amplitude, V-CENTER and V-amplitude to 0 in the user menu.

4.12.1 YPbPr input (480p signal)

a. Whit e balance adj ustment Input eight level gray of 480p format signal to HDTV YPbPr terminal, the picture mode to ST ANDARD. In the factory menu, select the WHITE BALANCE SETTING menu; adjust the white balance (color temperature to 12000K+/-8MPCD, the color coordinate to 0.270+/-0.008, 0.283+/-0.008). b. H-CENTER adjustment Input white grid of 480p format signal to HDTV YPbPr terminal, the picture mode to STANDARD. In the factory menu, select Horizontal setting menu, adjust the H POS, until the picture H-center and screen center accord. c. V-CENTER adjustment

S-Correction C-Correction Pin C ushion Asymmetry Correction Pin Cushion Correction Keystone Correction Parallelogram Correction Top Corner Correction Bottom Corner Correction

Support input signal of YPbPr

Signal form at TIMING of the VG848 format

480I 950 480P 978 576I 969

576P 979 1080I/60Hz 972 720P/60Hz 976 1080P/60Hz 970

In the factory menu, select Vert ical setting menu, adjust the V POS, until the picture V-center and screen center accord. d. V-SCANNING adjustment In the factory menu, select Vertical setting menu, adjust the V SIZE, until up and down over scanning of the picture to 8% of the all screen. e. Raster correction and horizontal amplitude adjust ment Receive white grid of NTSC signal, the picture mode to “STANDARD” in the factory menu, select horizontal setting menu, adjust the PCC, until the raster distort least, adjust the H SIZE, until right and left over scanning of the picture to 8% of the all screen. f. If the scanning line distortion and raster geometric distortion dissatisfy condition, you can adjust the factory menu item

SCOR CCOR PCAC PCC KEYST PARAL TCC BCC

4.12.2 YPbPr input (1080I/60Hz format signal) Adjustment mode to 4.12.1

5. Check point

5.1 check the high voltage a. Check the second anode and GND connect to the high voltmeter b. Receive US-7 signal, the picture mode to STANDARD, measure the high voltage to

30.0KV+/-1KV.

c. The brightness and contrast t o m in value, while measure the high voltage no more than 35KV.

5.2 check the CRT Filament voltage Receive the US-7 signal, the picture mode to STANDARD item, measure the CRT filament voltage to be 6.3+/-0.2Vrms.

5.3 Check the X-ray protection a. Receive the US-7 signal, the picture to STANDARD item. b. Connect TP1 to TP2 point of short circuit; X-ray protection cir cuit must be operation.

5.4 Check the picture part

5.5 Check the sub-brightness

5.6 Check chromatic purity and converge

5.7 Check the VIDEO and audio input/out put

5.8 Check the unit and the remote control function

6. Ex-factory pre-setting

7. Check the supply power (AC 100V-140V/60Hz)

S-Correction C-Correction Pin Cushion Asymmetry Correction Pin Cushion Correction Keystone Correction Parallelogram Correction Top Corner Correction Bottom Corner Correction

APPX: horizontal and vertical scanning adjustment diagram

Working principle analysis of the unit

The unit is digital frequency conversion processing of 16bit bus control color television, it adopt high integrity digital processing chip EX-11 of TRIDENT, this chip has a A/D conversion, decoder and scaler. The MCU is 16bit parallel processor M16C of RENESAS. The unit adopt frequency composition tuner, it can direct display frequency point of every channel. The decoder chip have digital comb filter, Y/C processing clean separation, chroma signal and non-crosstalk brightness signal. It adopts three 10bit A/D and D/A conversion to reality of the picture. The unit working a singles horizontal frequency, it has two YPBPR terminal inputs and support multi-high definition format (1080i60, 720p, 1080p and so on), it have picture freeze, dynamic digital code noise reduction, picture edge enhance, PULL-DOWN, 16:9 mode, timing turn off, rotate, CCD and V-CHIP functions and so on, The audio processing adopt application specific IC M61519 of MITSUBISHI, it supports stereo, treble-bass volume control, volume balance, surround sound and over-bass sound functions and so on. The unit has two AV inputs, an S terminal input, two YCRCB/YPBPR terminal inputs and a video output. The RF signal send to compose tuner TUNER101, its pin11 output 38M of IF signal. After the signal via pre-intermediate frequency amplifier circuit V101, it sends to the picture SAWF Z102 and sound SAWF Z101, their are co ntain two filter of single PAL and NTSC, it be contr olled high-low level of the pin 75 of MCU output (the pin59 of main board X701). The Z101 output sends to the pin8 of N101(LA7566) and Z102 output sends to the pin5 and pin6 of N101. The N101 supports PAL and NTSC system, it be controlled high-low level of MCU (N707, M16C/30620SPGP) output. The level define as follow:

System X701-pin55 X701-pin53 X701-pin51 X701-pin49

DK (6.5M) 0 1 1 0

I (6M) 1 0 0 1

BG (5.5M) 1 1 0 1

M(4.5M) 0 0 0 0 Note: 1-high level, 0-low level The pin13 of tuner output video, the video send to the digital chip N700(EX-11). It have VIDEO, two AV input, S terminal input and two YCRCB/YPBPR input, it through matching circuit to N700. After it via bus control and digital processing to pin37, pin39 and pin41 of X701 socket output R, G and B signal (peak value to 0.8V) and the pin 48 and pin48 output V-SYNC and H-SYNC. The V-SYNC and H-SYNC send to deflection chip N302(STV9118), the pin26 of N302 output H-signal drive the V301(2SC5422) and H-deflection coil of picture tube. The pin24 of N302 output EW signal for raster geometry adjustment. After the R, G and B signal of digital board send to the pin1, pin3 and pin5 of pre-video amplifier N801(STV9211) form pin14, pin16 and pin18 output to CRT board. The N401 of CRT board to R,G,B signal amplify to peak value(about 100V), it send to cathode of the picture tube. The SIF of the SAWF output send to stereo decoder NS01(LA72700), then it output L/R of audio. The L/R audio of TV, AV/S input and YCRCB/YPBPR input send to sound processor N601(M61519). Through BUS control of N707 to select processing of N601 signal channel, the pin25 and pin18 of N601 output L/R audio send to N602 (TA8256BH), the pin8 and pin12 of N602 output L/R audio drive speaker. In the mute state, the N707 send high level to the pin5 of N602, but the power amplifier without signal.

bPr1YPbPr2

t R

Block diagram

LA72700

I2C

NS01

SIF

N101

LA7566

Clamp Blanking R G B

I2C

L/R

N801 PRE-VIDEO AMP.

STV9211

I2C

N707

CPU

M16c/30620SPGP

AV ou

AV2

I2C

SOUND PROCESSING

N601

M61519

BOARD

LM2423

DDY STV9118

ROM 24C16

CRT

302

AV1/S

STEREO DECODER

AVOUT-V

TUNER

AV1(video)/Y

AV2(video)

YPbP

SOUND SAWF

PICTUR SAWF

N700 ND decodor, scaler Trident EX-11

CVBS

YPbP

I2C

EMST 16161

R G B

SOUND AMP. TA8256

CRT

H-AMP 2SC5422

V-AMP LA78041

IC block diagram

1. LA7566

10: AFT output 19: SIF output 9: AGC output 1: TV audio output 5, 6: picture IF input 13: TV video output 8: sound IF input 3: 9V

2. EX-11

185: S-C input 187: Pb2 input 196: AV1-V/S-Y input 180: Pr2 input 197: AV2-V input 14: SCL 198: TV-V input 16: SDA 200: Y1(PbPr) input 190, 191: AVOUT-V output 186: Pb1 input 28: B output 179: Pr1 input 29: G output 202: Y2(PbPr) input 30: R output 34: H-SYNC output 31: VM output 37: V-SYNC output 9, 168 and so on: 1.8V 36: CLAMP output 15: 5V-1

3. M61519FP

39: AV2 audio-L input 7: AV1/Saudio-R input 4: AV2aduion-R input 35: AVOUT audio-L output 6, 37: TV audio input 8: AVOUT audio-R output 38: YPbPr1audio-L input 11: audio- L output 5: YPbPr1audio-R input 19: audio-R output 40: YPbPr2audio-L input 22: CLOCK 3: YPbPr2audio-R input 21: DATA 36: AV1/Saudio-L input 20: 9V

4. STV9118

2: V-SYNC input 24: pincushion correction output 1；V-SYNC input 25: X-ray protection input 18: Vertical high voltage compensation input 31: SDA 17:Horizontal high voltage compensation input 30: SCL 26: horizontal signal output 29: 12V 23: vertical signal output

5. STV9211

1: R input 1: ABL 3: G input 5: B input 13: SDA 16: G output 19: CLAMP 14: B output 20: BLANK 7, 17: 5V 18: R output 12: SCL

6. LA72700V

5: SIF input 25: R output 11: SDA 26: L output 12: SCL 31: 9V

Wiring diagram

Trouble shooting

No N

1. No raster, No picture and No sound

Check the indicator

Press the power button

o signal

Check if the pin10 o CPU has low-level output

Check if it has X-ra protection

Check if it has vertical protectio circuit

Light

Turn on

Check if the N802 is normal

o-light

Check the FU501

Measure if the C516 is about 150V

Check the N501, N502 and peripheral circuit

Check the suppl power

Check the D501 and periphera circuit

2. Picture, but w i t hout sound

Check if the N602 output

Check if the pin2 and pin4 o sound amplifier output

Check the supply power, the pin5 of mute is low level

Yes

Speaker damage

Check if sound-processing

601 is normal.

3. Sound, but wit hout pi cture

No N

Without raster Raster

It has sound, but without picture

Check if the

in26 of N302

has H-frequency

Check if the V301 is damage

Abnormal

Check B+

Check if the H-V

circuit is normal ormal

Check the FBT

Check the filament

voltage of CRT

board

Check if the digital

rocessing board has RGB and H-V sync output

Check if the digital

rocessing board has RGB output

Check the N801 an peripheral circuit

Check the N700

and peripheral

circuit

Check the digital

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