Advent Q2716 Service Manual
SERVICE SERVICE
MANUALMANUAL
CONTENTS
X-RAY RADIATION PRECAUTION………………………………………………………1
SAFETY PRECAUTION
…………………………………………………………………..
1
PRODUCT SAFETY NOTICE…………………………………………………………….2
GENERAL INSTRUCTION……………………………………………………………………2
ALIGNMENT ITEMS AND PROCEDURE………………………………………………..2
FACTORY ADJUSTMENT MODE
…………………………………………………………
4
ADJUSTMENT METHOD………………………………………………………………………4
CHECKING POINTS……………………………………………………………………………6
OUT-FACTORY MODE PRESET……………………………………………………………7
POWER ADAPTABILITY CHECK
……………………………………………………………
USA CHANNEL FREQUENCY TABLE (181 CH)
………………………………………
7
16
WIRING DIAGRAM……………………………………………………………………….18
BLOCK DIAGRAM………………………………………………………………………...19
IC BLOCK DIAGRAM……………………………………………………………………..20
SCHEMATIC DIAGRAM
………………………………………………………………….
28
ELECTRICAL PARTS LIST………………………………………………………………30
1
CAUTION: THIS SERVICE MANUAL IS ONLY FOR PROFESSIONAL SERVICE PERSONNEL’S
REFERENCE. BEFORE SERVICING THIS CHASSIS, PLEASE READ THE FOLLOWING
NOTICE ITEMS.
1. SAFETY INSTRUCTION AND GENERAL INSTRUCTION
Before servicing and aligning this equipment, please read the following “X-RAY RADIATION
PRECAUTION” ,“SAFETY PRECAUTION” and “PRODUCT SAFETY NOTICE”.
1.1 X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards,
the high voltage must not be above the specified limit. The normal value of the high voltage of this receiver is
under 32 kV at zero beam current (minimum brightness) under DC135V main power(B+) , the high voltage
must not, under any circumstances, exceed 35 kV.
2. Each time a receiver requires servicing, the high voltage should be checked following the HIGH
VOLTAGE CHECK procedure in this manual. It is recommended the reading of the high voltage be recorded as
a part of service record. It is important to use an accurate and reliable high voltage meter.
* When checking, main power (B+) should be kept at 135 V.
3. The primary source of X-RAY RADIATION in this TV receiver is the picture tube. For continuous X-RAY
RADIATION protection, the replacement tube must be exactly the same type tube as specified in the parts list.
4. Some parts in this receiver have special safety-related characteristics for X-RAY RADIATION protection.
For continuous safety, parts replacement should be undertaken only after referring to the PRODUCT SAFETY
NOTICE below.
1.2 SAFETY PRECAUTION
WA RN I N G:
Service should not be attempted by anyone unfamiliar with the necessary precaution on this receiver. The
following are the necessary precautions to be observed before servicing this chassis.
1) Since the power supply circuit of this receiver is directly connected to the AC power line, an isolation
transformer should be used during any dynamic service to avoid possible shock hazard.
2) Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube.
The picture tube is highly evacuated and if broken, glass fragments will be violently expelled. Use shatter
proof goggles and keep picture tube away from the unprotected body while handling.
3) When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in
place, such as: non-metallic control knobs, insulating covers, shields, isolation resistor-capacitor network
etc.
4) When replacing parts or circuit boards, disconnect the power cord.
5) When replacing a high wattage resistor (oxiode metal film resistor) on the circuit board, keep the resistor
10mm (1/2in) away from circuit board.
6) Connection wires must be kept away from components with high voltage or high temperature.
1
7) If any fuse in this TV receiver is blown, replace it with the FUSE specified in the chassis parts list.
1.3 PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the 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 replacement components rated for higher
wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual
and its supplement electrical components having such features are shaded on the schematic diagram and
the parts list.
Before replacing any of these components, read the parts list in this manual carefully. The use of substitute
replacement parts which do not have the same characteristics as specified in the parts list may create shock,
fire, X-RAY RADIATION or other hazards.
1.4 General instruction
1.4.1 This chassis’ EEPROM(N801 M24C08) should copy standard data first, if necessary, deal it with
2
“factory adjustment”. If directly use blank EEPROM, should first preset I
C data, then go on other
common alignment. For factory adjustment method, refer to The appendix: Factory adjustment
mode.
If without special indication, the alignment is conducted on the below condition:
1.4.2
a)
AC power supply 120 V/60 Hz.
The whole unit is preheated for more than 30 min.
b)
(North America area) or others (depending on selling market).
1.4.3
There is built-in auto degaussing circuit, it will degauss automatically within 1second after turning on.
And the auto degaussing circuit can effect only when turning off the set and waiting for at least 30min
and then turning on.
1.4.4
If CRT is with magnetism and affects color purity and convergence, the internal degaussing can not
degauss completely, can use degaussor to degauss externally. If color purity and convergence is still poor,
then do color purity and convergence adjustment.
2 Alignment items and procedure
2.1 B+ voltage check
2.2 OSD character center adjustment
2.3 RFAGC voltage adjustment
2.4 Focus adjustment
2.5 Screen-grid voltage and white balance adjustment
2.6 SECAM colour adjustment
2.7 Horizontal, vertical scanning center adjustment
2.8 Horizontal, vertical scanning amplitude adjustment
2.9 Raster correction adjustment
2.10 The alignment flow chart see below figure.
2
EEPROM copy
High voltage check
X-ray protection check
B+ check
Filament voltage check
OSD position
SELF CHECK
RFAGC adjustment
Picture and sound
Stereo/mono/SAP
Sub-brightness check
FOCUS
White balance check
Screen-grid voltage
White balance adjustment
Color purity
convergence check
¡¢
Scanning amplitude center &
raster correction adjustment
AV terminals
Video/S-VHS/DVD
Self alignment
Check
The TV set & remote
controller's function check
Figure 1: Alignment flow chart
3
3 Factory adjustment mode
3.1 Enter into factory adjustment menu
Press SLEEP→PIC→DSP→MENU button on the remote controller in order (the period of two press
should be less than 5 seconds), the screen will appear factory alignment menu.
3.2 Factory menu operation
Repeatedly press“MENU” button, then the menu will enter into PAGE 1→PAGE 2→PAGE 3→
PAGE 4→PAGE 5 and recycle: press ▲ or ▼ button can select adjustment items upward or
downward, and press ◄ or ► button to confirm or adjust the item’s value.
3.3 To exit the factory menu
Press “SLEEP”button to exit the factory adjustment menu.
4 Adjustment method
4.1 B+ voltage adjustment
a) Make sure the power supply is AC120 V/60 Hz(for America or Canada area).
b) Connect the digital voltmeter to B+ testing point, receive A7 signal, set the picture control to
“NATURAL”status, adjust RP501 to make B+ voltage be 135 V±0.3 V.
c) In STAND BY mode, the B+ voltage will be about 84 V.
4.2 OSD position adjustment
Receive NTSC signal, change the factory adjustment menu page 3 OSD item’s value to make user’s
menu be in screen’s center position.
4.3 AGC adjustment
a) Receive 60 dB split field (or grey-scale) signal.
b) Use oscilloscope or digital voltmeter to monitor tuner 1 pin’s voltage (RFAGC pin).
c) Select factory adjustment menu page 4 R-AGC item, making use of [←][ →] button to increase the
value from down to up until the voltage just reach 4.0 V, at this time picture noisy spots should
disappear basically. Otherwise continue to fine tune R-AGC item.
d) Exit the factory menu.
4.4 Focus adjustment
4.4.1 Receive A12 signal, set picture mode to “MEMORY 2”status.
4.4.2 Adjust FBT FOCUS potentiometer to make screen’s B area’s focus optimum.
4.5 Screen-grid voltage,white balance adjustment
4.5.1 Receive A7 split field signal, set picture mode to “MEMORY 3” status.
4.5.2 Keep RCUT’s value, not change it (for example set it to 60), roughly adjust GCUT and BCUT
value to make white balance basically normal.
4.5.3 Set colour,contrast to minimum, set brightness to 50. Use oscilloscope to monitor CRT board red
gun waveform, adjust PAGE 4 BRTS value to make black level be 180 V.
4.5.4 Adjust SCREEN(accelerating electrode) potentiometer to make picture brighten 4 lattices.
4.5.5 Fine adjust white balance (colour temperature) 12000K±8MPCD X=0.270±0.008 Y=0.283±
4
0.008).
4.5.6 Adjust PAGE 2 BRTN value to make colour ,brightness,contrast all be minimum, picture“white
block”slightly lights up.
4.6 Horizontal,vertical scanning center adjustment
4.6.1 PAL(50 Hz)horizontal,vertical center adjustment
Receive G23 signal, set picture mode to “ MEMORY 2 ” status, fine tune vertical center
VP50,horizontal center HPOS, to make picture center be in accordance with screen center.
4.6.2 NTSC(60 Hz)H-center,V-center adjustment
Receive A6 signal, set picture mode to “MEMORY 2” status, adjust V-center VP60, H-center HPS,
to make picture center be in accordance with screen center.
4.7 Vertical scanning amplitude adjustment
4.7.1 PAL(50 Hz)vertical amplitude adjustment
Receive D35 signal, set picture mode to “MEMORY 2” status, adjust vertical amplitude HIT, to
make picture up/down overscanning be screen size’s 8%.
4.7.2 NTSC(60 Hz)vertical amplitude adjustment
Receive A12 signal, set picture mode to “MEMORY 2”status, adjust V-amplitude HITS, to make
picture up/down overscanning be screen size’s 8%.
4.8 Raster correction adjustment,H-amplitude adjustment
4.8.1 PAL(50 Hz)raster correction adjustment ,H-amplitude adjustment.
Receive PAL white crosshatch signal, set picture mode to “MEMORY 2” status, adjust DPC to
make raster distortion be in minimum, adjust WID to make picture left/right overscanning be
screen size’s 8%.
4.8.2 NTSC(60 Hz)raster correction adjustment
Receive NTSC A21 signal, set picture mode to “MEMORY 2” status, adjust DPCS to make raster
distortion minimum, adjust WIDS to make picture left/right overscanning be screen size’s 8%.
4.9 If scanning linearity distortion and raster geometrical distortion can not reach the requirements, and
if necessary, can make use of factory adjustment menu to adjust the following items:
VLIN V-linearity adjustment(PAL)
VLIS V-linearity adjustment (NTSC)
VSC Vertical S-correction adjustment (PAL)
VSS Vertical S-correction adjustment (NTSC)
CNRT Top corners’ correction
CNRB Bottom corners’ correction
KEY Trapezoid correction (PAL)
KEYS Trapezoid correction(NTSC)
4.10 Maximum sound output power
Receive single tone signal, set volume to maximumthe sound output power is 2×8 W. (can fine adjust
factory menu V100)
5
5 Checking points
5.1 High voltage check
5.1.1 Connect high voltmeter to CRT second anode and GND.
5.1.2 Receive A7 signal, set picture mode to “MEMORY 2” status, measure the high voltage value, the
reading should be 30.0 kV±1 kV.
5.1.3 When setting brightness and contrast to minimumzero beam currentmeasure the high voltage
value, the reading should not exceed 32 kV.
5.2 CRT filament voltage check
Receive A7 signal, set picture mode to “NATURAL” status, use effective value voltmeter to measure
CRT filament voltage, the reading should be (6.3±0.3)Vrms.
5.3 X-ray protection check
5.3.1 Receive A7 signal, set picture mode to “MEMORY 2” status.
5.3.2 Short S301, X-ray protection circuit should effect.
5.4 “Self-check”function check
Press “SELF-CHECK”button, the screen will display the following information:
M
SELF CHECK
BUS LINE:
OK
BUS CONT: OK
SYNC: OK
“OK” means bus, SYNC status, etc are normal.
If display “SCL-GND”, means SCL short to GND. ;
“SDA-GND”means SDA short to GND.
“SCL-SDA” means SCL short to SDA.
5.5 Picture and sound check
5.5.1 Receive standard TV signal.
5.5.2 Make use of picture control buttons to check colour,contrast,brightness,sharpenss,tint’s control
function.
5.5.3 Make use of sound control buttons to check sound control function.
5.6 Sub-brightness check.
Receive A7 signal, set colour,contrast,brightness all to 0, picture left one lattice slightly lights up.
5.7 This set can produce 14 kinds of testing signals by itself. In factory menu when select some
adjustment item, every press of AV button for one time, it will produce one testing signal.
5.8 Colour purity and convergence check(in normal way)
5.9 AV terminal input/output check
6
5.10 Other control buttons on the set/remote controller function check
e
t
n
h
l
r
t
6 Out-factory mode preset
Press“SHOP OUT” button, out-factory status will be preset to:
6.1 Picture menu: Colour 70
Brightness 70
Contrast 100
Sharpness 50
Tint 50
Blue background On
6.2 Volume preset to: 30
6.3 Language menu: ENGLISH
6.4 Colour system : AUTO
6.5 NOISE REDUCE: OFF
6.6 TV mode: Channel positionA2
6.7 SVM: MILD
6.8 V-CHIP PASSWORD: 0000
6.9 CHILD LOCK MENU
PAS SW OR D:
0000
6.10 SOUND MODE: MEMORY 1
6.11 TV/CATV CHANNEL: Both set to ADD
6.12 CCD CHANNEL: Set to C1
6.13 V-OHIP: Set all ratings and contents to IGNORE
6.14 V-CHIP BLOCK ON/OFF: Set to ON
7 Power adaptability check
AC 120 V/60 Hz (for North America area. If have other special AC power supply requirements, then
check with requirements).
Appendix1 factory adjustment menu
Item
OSD
NO.
character
1 HPOS OF 50Hz H-center MEMORY 2 D35
2 WID 16 50Hz H-amplitude MEMORY 2 D35
3 VP50 06 50Hz V-center MEMORY 2 D35
4 VLIN 0E 50Hz V-linearity MEMORY 2 D35
5 VSC 07
6 HIT 2B 50Hz V-amplitude MEMORY 2 D35
7
Preset Adjustment item
50Hz vertica
S-correction
Analogue
setting
MEMORY 2 D35
Input
signal
Adjustment method
To make picture horizontal center b
in accordance with CRT center
To make horizontal amplitude mee
standard
To make picture vertical center be i
accordance with CRT center
To make upper,lower crosshatc
height be equal.
To make upper,middle,lowe
crosshatch height be equal.
To make Vertical amplitude mee
standard
Te st in g
point
Screen
Screen
Screen
Screen
Screen
Screen
d
n
r
r
e
e
t
n
h
l
r
t
d
n
r
r
e
e
n
e
n
m
e
m
m
7 KEY 22
8 DPC 18
9 CNRT 08
10 VEHT 05
11 HPS 04 60Hz H-center MEMORY 2 A12
12 WIDS FD 60Hz H-amplitude MEMORY 2 A12
13 VP60 02 60Hz V-center MEMORY 2 A12
14 VLIS FF 60Hz V-linearity MEMORY 2 A12
15 VSS FE
16 HITS FD 60Hz V-amplitude MEMORY 2 A12
17 KEYS 01
18 DPCS FF
19 CNRB 07
20 HEHT 02
21 RCUT 60
22 GCUT 60
23 BCUT 60
24 GDRV 30
25 BDRV 30
26 CNTX 4E
27 CNTC 30
28 CNTN 18
29 BRTX 70
50Hz trapezoi
correction
50Hz pincushio
correction
Top edge and corne
correction
Vertical high voltag
compensation
60Hz vertica
S-correction
60Hz trapezoi
correction
60Hz pincushio
correction
Bottom edge and corne
correction
Horizontal high voltag
compensation
Dark area white balanc
Bright area whit
balance
Contrast maximu
value setting
Contrast middle valu
setting
Contrast minimu
value setting
Brightness maximu
value setting
MEMORY 2 D35 To correct picture trapezoid
MEMORY 2 D35 To correct picture E/W pincushion
MEMORY 2 D35/A12
MEMORY 2 D35/A12 fix
MEMORY 2 A12
MEMORY 2 A12 To correct picture trapezoid
MEMORY 2 A12 To correct picture E/W pincushion
MEMORY 2 D35/A12
MEMORY 2 D35/A12 Fix
Black/white
MEMORY 1
MEMORY 1 Gray scale Fix
Contrast 50 Gray scale Fix
Contrast 0
Colour 0
Brightness 50
Contrast 50
Brightness 100
Colour 0
signal or A7
signal
Black/white
signal or A7
signal
Gray scale Fix
A7 signal Fix
To correct top edge and corne
vertical line
To make picture horizontal center b
in accordance with CRT center.
To make horizontal amplitude mee
standard.
To make picture vertical center be i
accordance with CRT center.
To make upper,lower crosshatc
height be equal
To make upper,middle,lowe
crosshatch height be equal.
To make vertical amplitude mee
standard
To correct bottom edge and corne
vertical line
To make picture dark area to obtai
standard “white colour”
To make picture bright area to obtai
standard “white colour”
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
Screen
8
e
Contrast 0
m
e
e
e
e
Brightness 50
A7 signal Fix
Colour 0
Contrast 0
Brightness 0
A7 signal Refer to adjustment method
Colour 0
MEMORY 1 A7 signal Fix
MEMORY 2 A7 signal Fix
MEMORY 2 AVPA L Fix
Contrast 100
Brightness 50
A7 signal To make picture without colour
Colour 0
Screen
Screen
Screen
Screen
Screen
Screen
30 BRTC 50
31 BRTN 2C
32 COLX 4F
33 COLC 38
34 COLP 38
35 COLN 00
Brightness middle valu
setting
Brightness minimu
value setting
Colour maximum valu
setting
Colour middle valu
setting (NTSC)
Colour middle valu
setting (PAL)
Colour minimum valu
setting
Contrast
100
Tint 100
brightness70
A7 signal Fix Screen
36 TNTX 6F
NTSC tint maximum
value setting
colour 70
37 TNTC 38
38 TNTN 00
39 SCOL 04
40 SCNT OF
41 ASSH 00
NTSC tint middle
value setting
NTSC tint minimum
value setting
Sub-colour
adjustment
Sub-contrast
adjustment
Non-symmetry
sharpness
MEMORY 2
Contrast 100
Tint 0
brightness70
colour 70
MEMORY 2
MEMORY 2
A7 signal Fix Screen
A7 signal Fix Screen
A7 signal Fix Screen
Gray scale Fix Screen
Fix Screen
ABL control (refer to
42 ABL 27
appendix 2 for
MEMORY 1
A7 signal Fix Screen
details)
43 DEF 01
44 FLG 0 52
45 FLG 1 05
46 STBY 00
Set interlace scan to
01
Refer to appendix 2
for details
Refer to appendix 2
for details
Refer to appendix 2
for details
MEMORY 2
A7signal Fix Screen
Fix Screen
Fix Screen
Fix Screen
47 TNCD 40 Tint center(DVD) Fix Screen
48 VBLK 00
Refer to appendix 2
for details
Fix Screen
9
49 MOD 03
50 UCOM 80
51
MODE
3
80
52 OPT 17
Refer to appendix 2
for details
Refer to appendix 2
for details
Refer to appendix 2
for details
Refer to appendix 2
for details
Fix Screen
Fix Screen
Fix Screen
Fix Screen
A2 MTS/no GAME
53
OPTM 1
(Refer to
appendix
2 for
details)
A6 MTS/ GAME
22 No MTS/no GAME
26 No MTS/ GAME
A0 MTS/no GAME/AV3
Fix Screen
A4 MTS/GAME/AV3
54
OPTM 2
(Refer to
appendix
2 for
details)
Rotation/P4.43/N4.43
C5
/M-N
Rotation/N-M/P-M/P
85
-N
No rotation
45
/N-M/P-4.43/ N-4.43
No rotation
05
/N-M/P-M/P-N
RF:N▲AV:
P/N
South
America
tri-system
RF:N;AN:P
/N
South
America
system
Fix Screen
55 TUNR 02 Tuner select Fix
Any TV
signal
display
MENU
Character in screen center Screen
56 OSD 18
OSD horizontal
position setting
content
57 OSDF 55
CCD
58
59
OSD
CCD
OSDF
16
50
60 ST3 20
61 SV3 30
OSD oscillation
frequency
CCD horizontal
position setting
CCD OSD oscillation
frequency
NTSC3.58 TV input’s
sub-sharpness middle
value
NTSC3.58 AV input’s
sub-sharpness middle
value
Fix
Display
CCD
CCD character be in screen center Screen
caption
Fix
MEMORY
2
MEMORY
2
A12 Fix Screen
AV-N3.58 Fix Screen
10
62 SV4 30
Non NTSC3.58 AV
input’s sub-sharpness
middle value
MEMORY 2
AV-P4.43
N4.43
Fix Screen
DVD input’s
63 SVD 30
sub-sharpness middle
MEMORY 2
DVD Fix Screen
value
64 SHPX 1A
65 SHPN 1D
66 TXCX 1F
67 RGCN 1F
69 CLTM 0F
70 CLVO 4F
71 CLVD 58
Sharpness maximum
value setting
Sharpness minimum
value setting
DVD sub-colour
maximum value
DVD sub-colour
minimum value
Refer to appendix 2
for details
Refer to appendix 2
for details
Refer to appendix 2
for details
72 BRTS 20 Sub-brightness
73 RAGC 30 RF AGC
Sharpness
100
A12 Fix Screen
Sharpness 0 A12 Fix Screen
MEMORY 1
MEMORY 2
MEMORY 2
MEMORY 2
MEMORY 2
Contrast 0
Brightness 50
Colour 0
MEMORY 2
DVD Fix Screen
DVD Fix Screen
A12 Fix Screen
AV signal Fix Screen
DVD signal Fix Screen
Gray scale Refer to alignment method Screen
A7 Refer to alignment method Screen
74 HAFC 05 AFC gain Fix Screen
75
VCEN 00
76 NSHP 10
IC output vertical
signal center
Noise reduction
degree
Fix
MEMORY 2
Fix Screen
77 SYCT 08 (TEST) Fix
78 NOIS 01 (TEST) Fix
79 ONTM 00
80 V25 36
81 V50 40
82 V100 76
83 SUR 1 03
POWER ON MUTE
TIMER
VOL-25% volume
setting
VOL-50% volume
setting
VOL-100% volume
setting
At sound register 1’s
surround sound data
Fix
VOL-25
VOL-50
VOL-100
Fix
Single tone
signal
Single tone
signal
Single tone
signal
Fix
Fix
Refer to adjustment methods
Not
use
11
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