RCA TX809, TVD809 Service Manual

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

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, 2AWell Filtered

Temperature Controlled Soldering Station: Grounded Tip

TypeTip 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 XXs
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.

Page 3-2Page 3-1

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 its parameter limits will usually provide a relatively
poor signal to noise ratio, while adjustment to the other ex­treme of its 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 instruments 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.

Page 3-3 Page 3-4

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.

Page 4-1Page 3-5

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.

TX_TVD809 TX_TVD809
CABLE LEAD DRESS

High Voltage Lead Dress

CABLE LEAD DRESS

CRT& HV Lead Dress

Speaker Cable Lead Dress 1 of 2

Speaker Cable Lead Dress 2 of 2

Speaker and Degauss Lead Dress

Page 5-3

AC Cable Lead Dress

Page 5-4