Trident IS-TVHD30 User manual

COLOR TELEVISION
IS-TVHD30

CONTENTS
Safety precautions………………………………………………………………………..…
Alignment instructions. ………………………………….………..…………………….…
Working principle analysis of the unit……………………………….………….………….
Block diagram………………………………….. ……………………………………….…………
IC block diagram………………………………………………………………………..……
Wiring diagram ……………………………………………………………..……………...
Troubleshooting……………………………………………………………………………..……
Schematic diagram. ………………………………………………………………………..
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3
10
11
12
18
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1
Safety precautions
After the original service 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 hardware have been reinstalled per original 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 surfaces 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 literature.
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
Attention: This service manual is only for service personnel to take reference with. Before
servicing please read the following points carefully.

2
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 subject of X-rays in current
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 organization
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 high voltage compartment.
Do not operate the chassis longer than is necessary to locate the 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-ray.
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 ventilation.
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 casters across thresholds or deep pile carpets.

3
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 there is no special notice, 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 effects 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 purity 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 adjustment
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

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3. Factory mode adjustment
3.1 Enter factory mode adjustment
Press the “factory menu” button on the remote 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 the value.
3.3 exit the factory menu
Press the MENU button again and again; it can exit the factory menu.
E2PROM copy
B+ voltage
OSD position
AFT adjustment
AGC adjustment
Screen-grid voltage and white
balance adjustment
Centre of scanning amplitude and
raster adjustment
Check
Video/S-VHS/DVD
Colour purity and convergence
White balance
Sub-brightness
Picture parts
SELF CHECK
Filament voltage
X-ray protection check
High voltage check
Fig-1 Adjustment flow-chart
Auto adjustment
Stereo check
The unit and remote
Control function
Focus

5
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 turn 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 standard.
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 WHITE BALANCE SETTING menu, fixed the CUT OFF R and
adjust the CUT OFF G and the CUT OFF B, until the white balance is normal.
c. Select the 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 gray amplitude 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 Horizontal
setting menu, adjust the H POS, until the picture H-center and screen center accord.
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 POS, 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

6
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 adjustment 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 right
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 S-Correction
CCOR C-Correction
PCAC Pin C ushion Asymmetry Correction
PCC Pin Cushion Correction
KEYST Keystone Correction
PARAL Parallelogram Correction
TCC Top Corner Correction
BCC Bottom Corner Correction
4.11 Output 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.
Support input signal of YPbPr
Signal format TIMING of the VG848 format
480I 950
480P 978
576I 969
576P 979
1080I/60Hz 972
720P/60Hz 976
1080P/60Hz 970
When the white balance adjustment, the picture mode to STANDARD in the user mode. When 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. White balance adjustment
Input eight level gray of 480p format signal to HDTV YPbPr terminal, the picture mode to
STANDARD.
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

7
In the factory menu, select Vertical 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 adjustment
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 S-Correction
CCOR C-Correction
PCAC Pin Cushion Asymmetry Correction
PCC Pin Cushion Correction
KEYST Keystone Correction
PARAL Parallelogram Correction
TCC Top Corner Correction
BCC Bottom Corner Correction
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 to min 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 circuit 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/output
5.8 Check the unit and the remote control function
6. Ex-factory pre-setting
7. Check the supply power (AC 100V-140V/60Hz)

8
APPX: horizontal and vertical scanning adjustment diagram

9

10
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/Aconversion 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 contain two filter of single PAL and NTSC, it be controlled 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.

11
TUNER
SOUND SAWF
Z101
PICTUR SAWF
Z1
0
2
N101
IF
LA7566
SIF
N601
SOUND PROCESSING
M61519 R
LSOUND
AMP.
TA8256
L
R
AV1/S
L R L R YP
b
P
r1
YP
b
P
r2
L R
AV ou
t
L R
AV2
N707
CPU
M16c/30620SPGP
N801
PRE-VIDEO
AMP.
STV9211
N700
ND decodor, scaler
Trident
EX-11
ROM
24C16
EMST
16161
CRT
BOARD
LM2423
EMST
16161
I2C
I2C
I2CI2C
I2C
CRT
R
G
B
AV2(video)
YPbPr1
YPbPr2
CVBS
Clamp
Blanking
R
G
B
R
G
B
AV1(video)/Y
C
L
R
NS01
STEREO DECODER
LA72700
L/R
N
302
DDY
STV9118
H-AMP
2SC5422
V-AMP
LA78041
I2C
AVOUT-V
Block diagram

12
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

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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

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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

15
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

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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

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6. LA72700V
5: SIF input 25: R output
11: SDA 26: L output
12: SCL 31: 9V

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Wiring diagram