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PCB 2112021_
PK002PK001
HEADPHONEFRONT AV CLINCH
EWM BOARD
Part of 2112023_
HL108
VPRBL
VRAMP
GND
FAULT
BL103
DG1/+24V
GND
UB/E/WD
GND
POWER_LED
KEYSEL1
KEYSEL2
A/D
KEYDET3
GND
+5V
BK001
KDB BOARD
BK003
VIDEO_IN
GND
AUDIO_L_IN
GND
AUDIO_R_IN
L_OUT
L_IN
AUDIO_GND
R_OUT
R_IN
BK002
2
1
8
7
6
5
4
3
2
1
BA200
GND
R_AUD_DVD
GND
G-LINK
BG01BV02 P11
IR01
EEPROM
L_AUD_DVD
BY217
DVD_CHR
GND
DVD_Y
GND
DVD_CVBS
GND
+5VE
SDA
SCL
IR_DVD
GND
DVD_CMD_RDY
NC
IN/OUT
DVD BOARD
12VE
1
8VE
1
2
1
2
1
2
3
4
5
6
7
8
1
2
3
4
2
3
4
5
6
7
8
BP02
AC DEGAUSS1
AC DEGAUSS2
BP01
AC1
AC2
HP01
12VE
8VE
5VS
4VE
GND X 4
PG
-5VE
5VS
BPL08
FAULT
GND
VRAMP
VPRBL
5VS
4VE
GND X 4
PG
-5VE
5VS
PCB 2114669_
BW101
PCB 21116590_
POWER SUPPY SECTION
TV MAIN BOARD
VERTICAL
DEFLECTION
AC/DC_DEGAUSS
Part of 2112023_
2
1
GND GND
HTR GND HTR GND
HTR HTR
IV01
VIDEO IC
TA1268
CRT BOARD
BU04BU03
CRT_GND
BGR
1
GND
9VE
+160V +160V
RF MONO
VIDEO IF
VIDEO
CHROMA
CRT_GND
9VE
655 44 33 22 11
65544332
HV04HL02
RGB
GND
AUDIO_MUTE
EQUALISING
CCT & CHROMA
BPF/COMB FILTER
IA003
POWER
AMP
TEA6415C
CY
CRT
1
2
BA006
SPEAKER_L
GND
IV02
17
16
20
11
VIDEO
SWITCH
18
15
Y/C
SWITCH
SPK RSPK L
PWM
2
IS100
PREAMP
CC VIDEO
3
1
5
6
6
10
8
Part of 2112023_
Sound Compressor PCB
1
BA005
SPEAKER_R
GND
IS001 SOUND IF
UPC1851
DVD_Y
DVD_C
AV_CHROMA
REAR VIDEO
FRONT VIDEO
RF VIDEORF VIDEO
BK225
GND GND
TV_SDA
TV_SCL
GND GND
TV_IR
GND
TV_READY
TV_WTHDOG
HR81
1
1
SDA
2 2
2
SCL
3 3
3
GND
4 4
4
IR_CLK
5 5
5
GND
6 6
6
DV_CMD_RDY
7 7
7
8 8
8
NC
IR INTERFACE
BOARD
Part of 2112023_
ANT
BA001
BA008
654321
PS001
IS002
MC1452
AUDIO SWITCH
S-VHS VIDEO
BV01
TUNER
REAR_L/R
DVD_L/R
RF MONO
FRONT L
TO HORIZONTAL
DEFLECTION
REAR
AUDIO_CLINCH
RL
TO POWER SUPPLY
1
2
3
4
1
2
3
110 AC POWER
!
BPL06
1
2
3
HORIZONTAL
DEFLECTION
IR501
BUS EXPANDER
FROM HOR DEF
KEYSEL3
A/D
POWER_LEDIRIR
GND
KEYSEL1
KEYSEL2
GND
+5V
FVIDEO_IN
10
9
3
4
5
6
7
8
BS003
1
2
GND
1
BA004BV05
L_OUT
L_IN
AUDIO_GND
R_IN
R_OUT
876543221
AUDIO_R_IN
AUDIO_L_IN
GND
TO POWER SUPPLY
TO HR03
HR80
HR04
+5VE
SDA
SCL
GND
IR_DVD
GND
DVD_CMD_RDY
IR_DATA
HR03
DVD_C
GND
DVD_Y
GND
GND
BA002
GND
DVD_R
GND
DVD_L
HR02
PG
CC_VIDEO
PWM(AUDIO)
IR_CLK
IR_DATA
DVD_CMD_READY
RESET
EEPROM_WE
BURST
SR
IR/G LINK
IIC DATA EVER
IIC CLOCK EVER
+5VE
GND
HR01
+5VE
R_OSD
GND
G_OSD
VSYNC
B_OSD
HSYNC
FB_OSD
IR IN
IIC_CLK_EVER2
FAULT
IIC_DATA_EVER2
SND_LOGIC_A/D
SYNC_DET
KEYDET 2
KEYSEL1
KEYSEL2
ECO ON/STANDBY
KEYSEL3
1
2
3
4
1
2
3
4
5
6
1
1
2
3
4
5
6
7
8
1
2
3
4
5
6
1
2
3
4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
GEM STAR 4
HR02
PG
1
CC_VIDEO
2
PWM(AUDIO)
3
IR_CLK
4
IR_DATA
5
DVD_CMD_READY
6
RESET
7
EEPROM_WE
8
BURST
9
SR
10
IR/G LINK
11
IIC DATA EVER
12
IIC CLOCK EVER
13
+5VE
14
15
GND
HR01
+5VE
1
R_OSD
2
GND
3
G_OSD
4
VSYNC
5
B_OSD
6
HSYNC
7
FB_OSD
8
IR IN
9
IIC_CLK_EVER2
10
FAULT
11
IIC_DATA_EVER2
12
SND_LOGIC_A/D
13
SYNC_DET
14
KEYDET 2
15
KEYSEL1
16
KEYSEL2
17
ECO ON/STANDBY
18
KEYSEL3
19
PCB 2114607_
PAGE 8-2
PAGE 8-2
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TX_TVD809
ALIGNMENT PROCEDURES
Operating Conditions
Unless otherwise noted, the following conditions must be
observed when aligning the TV:
1. Chassis must be operated from a 120 VAC isolation transformer, with line voltage set to 120 VAC.
2. All voltages and waveforms referenced are with respect
to Ground
3. Set Picture Quality controls at nominal (Brightness Saturation at 50% and Contrast at 70%) by using the remote
control and pressing Menu and select:
à 2. Picture Quality
à 2. Picture Resets
à 2. Normal Lighting
4. A 10X probe must be used for oscilloscope and frequency
measurements.
5. Minimum warm-up time is 10 minutes.
Required Test Equipment
Isolation Transformer:
Digital Voltmeter: Range .1V DC to 1000V DC, Accuracy: ±
.5%/
DC Voltage Supply: Range: 0 to 50V, 2AWell Filtered
Temperature Controlled Soldering Station: Grounded Tip
TypeTip Temperature 500F to 800F Adjustable
NTSC Video Signal Generator: Must provide 1V-P-P Negative Sync, Video into 75-OHM input. Produce, standard NTSC
75% Saturated Color Bars with 100% White Window. (B&K
1249, or equivalent)
RF Signal Generator: 100 kHz to 150 MHz .1V RMS, Int.
Mod. 1KHz 30%
Cross Hatch Generator: Must have RF output.
Dual Trace, Delayed Sweep Oscilloscope: 25 MHz with
Channel invert capability. Sensitivity 5m/V/cm Maximum
Sweep Rate: .1us/cm.
POWER SUPPLY ALIGNMENT
1. Insure that input voltage is at 120 VAC, 60Hz.
2. Check that the values RP54, RP56, RP58 and RP59
are the proper values. Connect a voltmeter to UB
and switch on the set. Voltmeter should indicate that
UB below 135V. If the voltage at UB exceeds
135V, turn the set off immediately and check the values of the power supply circuit components. With
UB less than 125V proceed to the next step.
3. Tune the set to a channel with a good picture.
4. Set Picture Quality controls at nominal (Brightness Saturation at 50% and Contrast at 70%) by using the remote
control and pressing Menu and select:
à 2. Picture Quality
à 2. Picture Resets
à 2. Normal Lighting
5. Adjust PP01 (F7) so that the voltage at UB is 118.0V+/
- 1V.
6. Adjust controls VG2 and Focus on the IHVT (LL05) for
a normal picture.
7. Allow the set to warm up for at least 3 minutes.
8. Set brightness, contrast and volume to minimum.
9. The UB voltage should be 118.0V+/-1.5V. If not go
back to step1 and re-align the power supply.
TV Service Mode
The service mode is provided to facilitate instrument alignment and service adjustments. The service mode is accessed
by pressing a three-button combination on the front control
panel of the instrument.
Using the Front Panel Controls to enter Service Mode
1. Turn on the TV and select the channel that will be used
for the alignment procedure.
2. With the instrument ON press and hold the VOL2
button and then the CH+ button, then press and release the POWER button.
3. The TV set should immediately display a line menu on
the bottom of the screen (see below).
P X 0 V XXX
S X.XX 4
Service Mode Screen
The Parameter (P) number is on the left side of the display
and represents the parameter that will be adjusted. The Value
(V) is on the right side of the display and represents the decimal value stored for the function selected. Once the Service
Mode Security Code has been entered the CH /\ and CH \/
buttons on the front panel (or the remote transmitter) are used
to change the parameter (P) number. The VOL + and VOL -
buttons are used to change the decimal value (V) of the function.
NOTE: When the service mode is accessed,
the parameter will be 0. Parameter 0 is
used to input the security code. The security
code is necessary to protect the factory alignments from inadvertent modification. Attempting to change the parameter (P) using CH /\ or
CH \/ before the proper security code has been
entered will cause the instrument to exit the
service mode. A valid security code is entered
(using VOL + or VOL -). The group of XXs
on the second line in the center of the service
menu display the software version of the code.
TX_TVD809
ALIGNMENT PROCEDURES
Security Codes
When the Service Mode is first entered, the parameter (P)
will come up set at 0, which corresponds to the security
code function.
1. Turn on the TV and select the channel that will be used
for the alignment procedure and access the service mode
menu.
2. With the parameter (P) set to 0 adjust the value (V)
(using VOL + or VOL -) to 76 for access to the Front
Panel Service Mode.
3. Once the security code has been set, individual alignments can be accessed by pressing CH /\ or CH \/ chang-
ing the parameter (P) number.
4. Once a parameter (P) has been selected for a particular
alignment the VOL + and VOL - buttons can be used to
change the value (V) of the alignments selected. Parameters available through the front panel are shown in table
Param eter # Parameter name Value range Notes and com ments
00 security number Must be 076
04 VCO 127(Mono only)
05 AGC 31 (Stereo)
06 Red cut-off 255
07 Green cut-off 255
08 Blue cut-off 255
09 Green G ain 255
10 Blue Gain 255
11 Peak white 52
12 Horizontal phase 31
13 Vertical phase 15
14 Vertical amplitude 63
15 Decoder Input Level 63
16 Decoder _stereo VCO, 63
17 Decoder Filter Setting, 63
18 Decoder_Low _Band, 63
19 Decoder_High_Ban d, 63
20 Decoder_SA P_VC O, 63
21 S-Video Feature 0 - D isable 1 - En able TX809 Stereo Model Only
22 Speaker On/Off Feature 0 - Disable 1 - Enable TX809 Stereo Model Only
23 Sound Log ic Feature 0 - Disable 1 - Enable TX809 Stereo Model Only
24 Auto Tuning F eature 0 - Disable 1 - Enable TX809 Stereo Model Only
25 Gemstar OSD Horizontal 185
26 Gemstar OSD Vertical 160
5. To exit the service menu, press POWER on the remote control or front panel.
P 0 0 V 76
S X.XX 4
Security Code Entry
Must not advance to other
parameters until value set
63 (Mono)
Table 1.
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TX_TVD809
ALIGNMENT PROCEDURES
Note: Before adjusting any parameters access all the parameters and write down the initial value for each. This will
allow you to return to a known value if you encounter
problems with the alignment.
RF AGC
Test Point: Observe Display
Adjust: AGC (P5) Range 0 - 31
The RF AGC has been preset at the time of manufacture for
optimum operation over a wide range of input signal conditions. Readjustment should not be required unless the tuner,
IC IV01 or IC IR01 has been replaced. Adjustment of the RF
AGC parameters may not have any visible effect except under unusual conditions. Adjusting the RF AGC to one extreme of its parameter limits will usually provide a relatively
poor signal to noise ratio, while adjustment to the other extreme of its parameter limits will cause overload conditions
such as channel 6 color beats or Cable TV adjacent channel
interference. If the RF AGC parameter setting is adjusted,
check all local channels for proper operation. Use the weakest local channel to adjust RF AGC parameter setting.
Note: The instruments channel can be changed by entering a channel number using the digit buttons on the
remote control.
1. Tune TV to weakest local station.
2. Access the service menu and select AGC alignment parameter (05).
3. Make a note of the value setting prior to making any
adjustments. This so that you may reset the parameter to
that value if no visible difference is detected when adjusting from one extreme of the parameter limits to the
other.
4. Adjust the value of the AGC alignment parameter (05)
to a value where the weakest viewable channel is no
longer visible and a gray screen is displayed (Unusable
Signal) or to the maximum parameter value setting where
the picture quality is degraded the most (loss of color,
snow or other visible defects).
5. Adjust the value of the AGC alignment parameter (05)
to a value where the weakest viewable channel is now
displayed and further adjustment of the parameter no
longer improves the picture quality.
6. Check all local channels for proper operation with the
new setting.
Picture Quality Alignment
SCREEN ADJUSTMENT
Test Point: Observe Display
Adjust: SCREEN (VG2) IHVT
1. Tune the instrument to receive a gray scale stairstep signal. Note: Some generators produce gray scale stairsteps
by using the color bars signal with the color burst turned
off. This produces bars that step from Black (7.5IRE) to
White (77IRE).
2. Set Picture Quality controls at nominal (Brightness Saturation at 50% and Contrast at 70%) by using the remote
control and pressing Menu and select:
à 2. Picture Quality
à 2. Picture Resets
à 2. Normal Lighting
3. Adjust the SCREEN (VG2) until the first gray scale bar
(7.5 IRE) is just visible.
PEAK WHITE ADJUSTMENT
Test Point: TU51, 61, 71 Collector Kine PCB
Adjust: Peak White Range: 0 - 52
1. Tune the instrument to receive a gray scale stairstep signal.
2. Set Picture Quality controls at nominal (Brightness Saturation at 50% and Contrast at 70%) by using the remote
control and pressing Menu and select:
à 2. Picture Quality
à 2. Picture Resets
à 2. Normal Lighting
3. Measure the collector voltage of TU51, 61, and 71. Use
the collector of the transistor with the highest peak-peak
voltage for this adjustment.
4. Place the instrument in the TV SERVICE MODE.
5. Select the PEAK adjustment and adjust the value to
obtain 98V +/- 2V between the blanking and White level.
Color Temperature Adjustment
Test Point: Observe Display
Adjust: Red cut-off (P06) Range: 0 - 255
Green cut-off (P07) Range: 0 - 255
Blue cut-off (P08) Range: 0 - 255
Green Gain (P09) Range: 0 - 255
Blue Gain (P10) Range: 0 - 255
NOTE: Allow the instrument to warm up for at least 15 min-
utes before doing the Color Temperature Adjustments.
This compensates for color drift in the instrument as it
warms to run temperature.
TX_TVD809
ALIGNMENT PROCEDURES
1. Tune the instrument to receive a gray scale stairstep signal.
2. Set Picture Quality controls at nominal (Brightness Saturation at 50% and Contrast at 70%) by using the remote
control and pressing Menu and select:
à 2. Picture Quality
à 2. Picture Resets
à 2. Normal Lighting
3. Put the instrument into TV SERVICE MODE.
4. Adjust Green Gain (P09) to 128 and adjust Blue Gain
(P10) to 128.
5. Adjust Red cut-off (P06) value to mid -point (128).
6. Adjust Green cut-off (P07) value to zero (0).
7. Adjust Blue cut-off (P08) to produce magenta in the first
few steps of the scale.
8. Adjust Green cut-off (P07) to produce gray tone on the
first few steps of the scale. Readjust Red cut-off and
Blue cut-off if necessary to produce best gray tone.
9. Adjust Green Gain (P09) and Blue Gain (P10) for best
white level on the last steps of the gray scale.
FOCUS ADJUSTMENT
Test Point: Observe Display
Adjust: Focus Control IHVT
1. Tune the instrument to receive a crosshatch signal.
2. Set Picture Quality controls at nominal (Brightness
Saturation at 50% and Contrast at 70%) by using the
remote control and pressing Menu and select:
à 2. Picture Quality
à 2. Picture Resets
à 2. Normal Lighting
3. Adjust the Focus control (LL05) for best overall focus.
Picture Geometry Adjustment
Horizontal Phase Adjustment
Test Point: Observe Display
Adjust: PL140 Full CCW
Horizontal Phase (P12) Range: 0 - 31
1. Using a signal generator tune the instrument to receive a
crosshatch or other pattern that can be easily centered
horizontally.
2. Set Picture Quality controls at nominal (Brightness Saturation at 50% and Contrast at 70%) by using the remote
control and pressing Menu and select:
à 2. Picture Quality
à 2. Picture Resets
à 2. Normal Lighting
3. On the E/W Correction Board adjust PL140 full CounterClock-Wise (CCW).
4. Access the service menu and select Horizontal Phase
alignment parameter (P12).
5. Adjust value range to center picture horizontally (side to
side) use VOL + button to increase value range and
use VOL - button to decrease value range.
Vertical Adjustments
Test Point: Observe Display
Adjust: Vertical Phase (P13) Range: 0 - 15
Vertical Amplitude (P14) Range: 0 - 63
1. Tune the instrument to receive a crosshatch pattern.
2. Put the instrument into TV SERVICE MODE.
3. Adjust Vertical Amplitude (P14) so that both the top and
bottom of the crosshatch pattern can be viewed.
4. Adjust Vertical Phase (P13) to center the display, using
the top and bottom edges of the crosshatch as a reference.
5. Adjust Vertical Amplitude (P14) so that the top and bottom lines of the crosshatch pattern are an equal distance
from the edge of the screen. Adjust so that approximately
3.75% of the crosshatch pattern is hidden at both the top
and bottom of the display (7.5% over scan +/- 2.5%)
EXAMPLE: If the crosshatch display has 12 blocks verti-
cally, adjust so that ~ 1/2 block is hidden at both
the top and bottom of the display (0.5/12 =
4.1%).
6. If necessary repeat the vertical adjustments to get the
proper overscan symmetry.
E/W Correction
Test Point: Observe Display
Adjust: E/W Horizontal PL140
E/W Pincushion PL141
E/W Trapezium PL143
Horizontal Phase (P12) Range: 0 - 31
1. Tune the instrument to receive a crosshatch pattern.
2. On the E/W Correction Board adjust PL140 full CounterClock-Wise (CCW).
3. Adjust PL140 (Horizontal Amplitude) so that the sides
of the crosshatch pattern are an equal distance from the
edge of the screen. Adjust so that approximately 4.5%
of the crosshatch pattern is hidden at both sides of the
display (9.0% over scan +/-3%)
EXAMPLE: If the crosshatch display has 15 blocks horizon-
tally, adjust so that ~ 3/4 block is hidden at both
sides of the display (0.75/15 = 5.0% X 2 + 10%).
4. Adjust PL141 (Pincushion Correction) on the E/W Mod-
ule so that the vertical lines on the sides of the cross-
hatch pattern are straight.
5. Adjust PL143 (Trapezoid adjustment) on the E/W Module so that the vertical lines on either side of the crosshatch pattern are parallel to the sides of the screen.
6. Put the instrument into TV SERVICE MODE.
7. Adjust the Horizontal Phase (P12) range to center picture horizontally.
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TX_TVD809
ALIGNMENT PROCEDURES
TX_TVD809
TROUBLESHOOTING
GEMSTAR
Gemstar Positioning
Test Point: Observe Display
Adjust: OSD Horz. (P25) Range: 0 - 185
OSD Vertical (P26) Range: 0 160
Note: The OSD for Gemstar is not intended to need any alignment. This alignment should only be performed if the Gemstar
module is repaired or replaced.
PIP Window
Seperation Gap
Information
Boxes
Bottom Edge
trol the positioning of entire Guide Menu.
3. Access the Service Menu. This action will remove the
Guide Menu.
4. Go to parameter #25, Gemstar horizontal position. Adjust the value by one in either direction. This will bring
up the Gemstar Diagnostic Screen. Adjust the horizontal centering of the Gemstar display so that the distance
from the edge of the color bars to the edge of the tube is
the same on both the left and right sides of the display.
Left Intentionally Blank
Guide Plus+ Menu
1. Tune to a RF channel that carries Gemstar Plus+ information in the Vertical Blanking Interval (VBI).
2. Press Guide on the remote control to access the Guide
Plus+ menu shown above. Familiarize yourself to the
layout of the Menu screen. The Gemstar alignments con-
Gemstar Diagnostic Screen
1. Go to parameter #26, Gemstar vertical position. Adjust
the vertical centering of the Gemstar display so that the
distance from the upper edge of the PIP window to the
top edge of the tube is the same distance as the distance
from the bottom of the blue bar to the bottom edge of the
display.
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Front Audio In
Rear
Audio
In
WB Audio
(from Sound/Pix IF)
(from Sys-
Con IG401)
I2C2
Headphones
R
L
39
38
Clk
Dat
To
37
Stereo Demux
Tone & Vol
36
7
23
2
12
IA002
26
22
L
6
Int Spkr
Amp IA003
25
R
8
L
R
Audio
Compressor
IA001
40
41
R
10
4
L
To SysCon IG401
(control for auto vol)
R
5
Ext Spkr
Amp IA502
3
L
R
To Int
Spkrs
1
7
To Ext
Spkrs
L
TX809 Audio Processing Block Diagram
Audio Processing
The TX809 audio circuit is comprised of a Stereo De-Multiplexor (IA002) and two
(2) amplifier IC’s, IA003 and IA502. IA002 is responsible for decoding the stereo
signal into left and right channels and also provides for tone and volume control.
Amplifier IA003 drives the internal speakers while IA502 provides drive for the
external speakers. IA003 also has an output for the headphones. The stereo
de-multiplexor is controlled by the System Control uC, IG401 via the I2C2 bus.
The wide band (WB) audio from the Sound/Pix IF is input to IA002 pin 7. The
front and rear audio inputs are applied directly to IA002 pins 36 through 39. All
switching and signal selection are accomplished in IA002 via control from the
I2C2 bus. The sound compressor (IA001) serves to compress the audio
dynamic range by minimizing any sudden and undesirable changes in audio
level. The output from the Sound Compressor is a DC control signal that is
applied back to the system control IC, IG401. IG401 then communicates the
desired changes back to IA002 via the I
2
C2 bus.
Troubleshooting
If an audio problem is suspected check the following:
1. Check for audio power supplies to audio circuits.
2. Confirm speakers are not shorted or open.
3. If problem appears to be stereo related, inject stereo signal (from generator)
into pin 7 of IA002 and check signal path.
4. If problem is external input related, inject know mono audio signal and check
signal path.