CTV Trouble Shooting Guide

1
CTV Trouble Shooting Guide
Chassis Venus-1BST
Volume 1 By Techno Electronics Limited Kashipur
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2
Chassis Venus-1BST

• Content
• Preface
• Important tips....
  ..Page 02
• Circuit Diagram.03
• Important Photo...................................
  ..................................................
  ...........................04-05
• Applicable models
• ??? ??? ...........06
• ??? ?????? ??? .07
• ?? ????? ......................
  ...................08
• ?? ?????? .....................
  ...................09
• H-???? .....10
• V- ???? 11
• ?? ??? 12
• ???? ?????? / ?? ?????? /???? Skipping.
  ................13
• ????? ?????? ...14
• ???????(Retrace ) ???? ..
  .15
• ?? ??? ?????? (??? / ??? / ????
  ).16
• AV ??? ?? ??? ?? ?????? 1
  7
• RF Intermittent ??? ?? ??? .......
  ..............18

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3
Chassis Venus-1BST
Double click here for .pdf file
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4
????? ?. ?
????? ?. ?
????? ?. ?
Tuner Voltage Pin1 3.0V 1.9V(At good
signal) Pin2 2.39V Pin3 0 V Pin4 1.8V Pin5
2.1V Pin6 NC Pin7 4.99V Pin 8- NC Pin 9
-33.99V Pin 10 NC Pin 11- INTERMIDIENT
FREQUENCY
SMPS (Switch Mode Power Supply)
STR
SMPS (Switch Mode Power Supply)
SMPS Front View)
SMPS Back View)
SMPS PRIMARY SECTION
STR 0765
SMPS PRIMARY SECTION
STR 0765
SMPS SECONDARY SECTION
SMPS SECONDARY SECTION
??? ?.1
??? ?. 5
4
2
3
SMPS Secondary D 815 17V(????? IC) D 814
15V(?????? ) D816 12V (?????????? IC) D 811
110V (FBT B) D 813 24V(??????? ????????????)
????? ?. ?
Micon IC
????? ?. ?
????? ?. ?
TDA12135PS/N3/3/A07
Tuner
Sound IC
??? ?. ??
??? ?. ??
??? ?. ??
TDA7297SA
STR COQ765RT Pin 1 250V (DRAIN) Pin 2 0 V
(GND) Pin 3 18.2V (VCC) Pin 4 1.1V
(VFB) Pin 5 5 V (SYNC)
??? ?. ?
??? ?. ??
??? ?. ??
??? ?.?(AGC)
??? ?.7(5V)
??? ?.9(33V)
??? ?.?? (IF)
??? ?.?
??? ?.?
??? ?. ??
??? ?. ?
??? ?
5
????? ?. ?
????? ?. ?
????? ?. ?
Regulator IC(IC 7805)
CRT Socket(Tr. Base)
Tr. H-Out(TR,6810)
R.G.B Color(???,??? ???? ) Transistors
Base collector emitter
?????(9V) ??????? ??????(5V)
????? ?. ??
????? ?. ??
AV Socket
FBT(Fly Back Transformer)
VOLTAGE
CHART FBT Pin 1 274.5V AC
20.37V DC Pin 2(B)
0V (GND) AC 108.5V
DC Pin 3(V) 41.19V AC
0V DC Pin 4(v-) 30.46V AC
0.13V DC Pin 5(GND)
- - - - Pin 6(Heater) 7.10V AC
0V DC Pin 7 41.85V AC
80mV DC Pin 8(ABL)
2.16V AC 6.27V
DC Pin 9 - - - - - Pin 10 (180V)
23.1V AC 108.5V DC
?????? ?????? ,??????, ????? ?
????? ?????? ??????,????? ?
???? ?? ??? ??? POT ?? ??? ???
??????? ?? ??? ???? ?? POT ??? ???
??? ?
6
Chassis Venus-1BST
??? ???
VOLTAGE CHART STR COQ765RT Pin 1 250V Pin 2
0 V (GND) Pin 3 18.2V Pin 4 1.1V Pin 5 5
V PIN 5-4-3-2-1(???? ?? ????) SMPS Secondary D
815 17V(????? IC) D 814 15V(?????? ) D816
12V (?????????? IC) D 811 110V (FBT B) D
813 24V(??????? ????????????)
????? ????? ,???? ?????,??? ???? ????? ?? ??? ???
???? ?? ??? ???
???
???
???
?????????? Diode ?? NTC ??? ??? (NT801)
???? diodes /NTC ?? ??? ???
???
???
C805, STR Pin 1 Voltages ??? (250V), ???
??? ??? C805,?? SMPS
STR
???
???
STR ?? ??? 3 ?? 18V ??? ???
??? ??? D802, VD802, R801, R802
???
???
STR ???? ?? Ssecondary Voltage ??? ???
??? ??? Ssecondary ?????????? diodes
???
??? ??? STD. BY Guideline
??? ?
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?.
?,?, ?? ?
7
Chassis Venus-1BST
Std. by
VOLTAGE CHART STR COQ765RT Pin 1 250V Pin 2
0 V (GND) Pin 3 18.2V Pin 4 1.1V Pin 5 5
V PIN 5-4-3-2-1(???? ?? ????) SMPS Secondary D
815 17V(????? IC) D 814 15V(?????? ) D816
12V (?????????? IC) D 811 110V (FBT B) D
813 24V(??????? ????????????) Micon Audio
Voltages Pin 3 8V Pin56 0.4V
???
D811 ?? ????? ?? ?? Voltage (110V) ??? ???
??? ??? D811, SMPS, FBT ?? ????
???
???
??? ??? HDT, Driver Tr. V401
??? ??? H-out Tr. ??? Voltage 0.5V
???
???
???? VD853 VD852
??? ??? SMPS Sec. Voltages, VD853(8.2V)VD852(5.1V
)
???
???
??? ??? disconnecting load
???? SMPS
???
???
??? ??? Section load supply
??? ??? ?? ????? ????
???
??? ??? DRY ?? ??? Micon pin No.3 for 8V,??? ???
?? ???? crystal X201,Crystal ok ?? ?? Micon ????
???
??? ??? Micon IC ??? No. 3 for 8V
???
???
??? ??? Micon Pin no. 56 (0.4V), Pin no. 38 (3.3V)
???? Micon, ?? V841
??? ?
???? ??????? ?? ??? ???? ??? ?. ??? ????? ?. ?,?,
??? ?
8
Chassis Venus-1BST
No sound
VOLTAGE CHART IC 7297 Pin 1 5.5V Pin 2
5.5V Pin 3 11.5V (Vcc) Pin 4 1.4V Pin 5
NC Pin 6 5.0V Pin 7 5.0V Pin 8 0 Pin 9
0 Pin 10 NC Pin 11 NC Pin 12 1.4V Pin
13 11.5V Pin 14 11.5V Pin 15 5.5V Pin 16
0.9V Pin 17 17V Pin 18 8.6V Pin 19 8.6
V Micon Audio Voltages Pin 58,59 3.57V Pin 31
(UnMute) 0V Mute 0.6V)
???
Speaker ?? across Voltage ??? ???
speaker ????
???
???
Speaker connector ????
Sound IC 7297 ?? Pin ?. 1,2 14,15 ?? Voltage
??? ???
???
???
IC7297 ????
IC7297 ?? ??? ?.3 ?? 17V ??? ???
???
???
??? ??? C878, D815, VD1, C601
???? R886/ C878/D815/VD1/C601
???
???? SMPS ?? ??? ??? 17V
???
???
??? ??? Micon IC Voltage pin 58,59 (3.57V)
???? Micon IC
???
??? ??? Micon IC ?? pin 31 (0V)
???
???? Micon IC
??? ?
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ?,
??? ?
9
Chassis Venus-1BST
No Raster
VOLTAGE CHART Screen Voltage 285V Heater
Voltage 6.3 V
???? STD. BY Guideline
Not Glowing
??? ??? EHT Voltage Generation By Tester on FBT
Anode wire
Tester Glowing
???
CRT Base ?? ??????? Voltage (285V) ??? ???
??????? Adjust ??? ???? FBT ????
???
???
CRT Base ?? W77A ?? heater Voltage (6.3V) ???
???
???? W77A, ?? Connector XP501
???
CPT ????
??? ?
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ?
?? ??
10
Chassis Venus-1BST
H. Line
???
??? ??? Vertical Yoke Wire
Wire ???? ?? Soldering ??? ???
???
???
??? ??? Voltage IC301 ?? ??? ?.2 (16.5V), ???
?.4 (15.3V)
???? R403, R427, D404, D402, VD401, VD402
???
??? ??? Vertical IC301 Voltages
???
???
??? ??? Micon IC 201 pin 14, 15 Voltage (0.6V)
???? Micon IC201
???
???? IC301(LA78040/41)
??? ??
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ?
?? ?
11
Chassis Venus-1BST
V. Line
VOLTAGE CHART FBT Pin 1 274.5V
AC 20.37V DC Pin 2(B)
0V (GND) AC
108.5V DC Pin 3(V) 41.19V AC
0V DC Pin 4(v-) 30.46V
AC 0.13V DC Pin 5(GND)
- - - - Pin 6(Heater) 7.10V AC
0V DC Pin 7
41.85V AC 80mV DC Pin
8(ABL) 2.16V AC
6.27V DC Pin 9 - - - - - Pin 10
(180V) 23.1V AC
108.5V DC
???
Yoke Conn. ??? ???
Wire ???? ?? Dry Solder ??? ???
???
???
??? ??? Horizontal ??? Continuity
???? Yoke Assembly
???
???
Solder ??? (L401, burn track)
??? ??? Dry L401 (coil) ,burn track cut.
??? ??
12
Chassis Venus-1BST
No color
DESIGN DATA Sub Colour (SCL) JCT Thomson
60 Samtel 63 USER DATA Colour Setting
50 Colour System - PAL
???
Signal condition (gt40dB) ??? ???
Cable operator ?? ?????? ??? ???
???
???
Color step 50 ???
User ??? ??? ??? ??? ???
???
???
Color System User ??? ??? ??? ???
color system ?? PAL ??? ????
???
???
Sub color design data ??? ??? ??? (Refer right
side Table)
EEPROM ???? ?? Design data ??? ???
???
???
Crystal X201 dry solder ??? ?? ??? ??? ???
Crystal ???? ?? ??? ???
???
Micon ????
??? ??
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ?
?? ?
13
Chassis Venus-1BST
Snowy Picture / No Tuning /Channel Skipping
VOLTAGE CHART Tuner Voltage Pin1 3.0V 1.9V(At
good signal) Pin2 2.39V Pin3 0 V Pin4
1.8V Pin5 2.1V Pin6 NC Pin7 4.99V Pin 8-
NC Pin 9 -33.99V Pin 10 NC Pin 11-
INTERMIDIENT FREQUENCY DESIGN DATA AGCT
Value GDC Tuner 25 ONIDA Tuner
22 LONGSIN 18
???
RF cable / Signal strength ??? ???
RF ???? ????, cable operator ?? ?????? ???
???
???
sharpness 50 ?? ?? ???
User ??? ??? sharpness ?????? ?? ?????? ????
??? ???
???
???
?????? ???? ??? AGCT Value ??? ??? (Refer side
table)
AGCT Value ???? As per side table
???
???
?????? Solder ??? ?? ??? ???
Tuner ?? ??? pins ?? dry solder ??? ???
???
???
Tuner ?? ??? Pin ?? Voltages ??? ???
supply related ckt.??? ??? ?? tuner ????
???
???
Transistor ???? ?? ??? ???
V101 transistor ??? ???
???
Micon ????
??? ??
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ?
?? ?
14
Chassis Venus-1BST
Plain Raster
Tuner Voltage Pin1 3.0V 1.9V(At good
signal) Pin2 2.39V Pin3 0 V Pin4 1.8V Pin5
2.1V Pin6 NC Pin7 4.99V Pin 8- NC Pin 9
-33.99V Pin 10 NC
???
Tuner voltages ??? ???
C 131 ????
???
???
Micon ?? Pin no. 12 13 (VIF in 2V) ??? ???
Micon IC ????
???
???
Micon IC ????
V101 ??? ???
Pin 11- INTERMIDIENT FREQUENCY
??? ??
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ?
?? ?
15
Chassis Venus-1BST
Retrace line
VOLTAGE CHART IC501 VIDEO IC TDA6107JF Pin 1
2.35V DC Pin 2 2.35V DC Pin 3 2.1V DC Pin 4
0V (GND) Pin 5 3.8V DC Pin 6 182V DC Pin 7
162V DC Pin 8 155V DC Pin 9 159V DC
???
Adjusting FBT ??? ??????? ??? ??? (screen pot)
Focus pot ?? ? touch ???
Adjust ??????? pot ?????? FBT ????
???
???
CRT Board ?? ( CN501 Conn)?? 180V ??? ???
D403 ?????? FBT ????
???
CN501 ?? R G B voltage ??? ??? R , G , B ?1.8V
to 2V
???
Micon IC ????
???
IC501 VD501 VD504 ?R G B voltages (2V) ???
???
???
???? IC501/ VD501VD504
Transistor Base CRT ??? Transistor ?? Voltage ???
???
??? ??
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ?
?? ??
16
Chassis Venus-1BST
One color Missing ( Red / Blue / Green )
VOLTAGE CHART IC501 VIDEO IC TDA6107JF Pin 1
2.35V DC Pin 2 2.35V DC Pin 3 2.1V DC Pin 4
0V (GND) Pin 5 3.8V DC Pin 6 182V DC Pin 7
162V DC Pin 8 155V DC Pin 9 159V DC
???
CRT base?? RGB pin ?? dry solder ??? ???
Touch-up ??? ?? ??? ???
???
?????? IC IC501/RGB TR. ?? dry solder ??? ???
???
Touch-up ??? ?? ??? ???
???
CRT Connector XP501 ?? R,G,B I/p voltage ( 2.2V)
??? ???
???
Video IC IC501 ???? ?? ??? ???
???
???
Main PCB ??? Xp501 ?? Xp201 ?? Connector ??
Continuity ??? ???
???? ?? ??? ???
Transistors base CRT ??? RGB Transistors ??
Voltage ??? ???
???
???
R285 , R286 , R287 ???? ?? ??? ??? ???
???? ?? ??? ???
???
???
Micon IC ?? pin 44,45,46 ?? ( 2.1 V) Voltage
??? ???
Micon IC ???? ?? ??? ???
??? ??
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ?
?? ??? ?. ? ?? ????? ?. ?
17
Chassis Venus-1BST
AV Mode No Color No Picture
???
??? ??? DVD, Setup box, AV cable ??? ?? ??? ?? ??
????
instrument ????
???
???
AV ????? ??? dry ?? track cut ??? ??? .
?? ?? ?? Resolder ???
???
???
C221 ?? micon IC ?? Pin no. 62 ( 2V) ??
Voltage ??? ???
C221 ???? ?? ??? ???
???
???
Track ???? ?? ??? ???
AV Socket ?? C221 ?? track ??? ???(??? ????? ??
?? ?? )
???
???
Crystal X201 Dry solder ???? ???? ?? ???? ???
X201 ???? ?? ??? ???
???
Micon ???? ?? ??? ???
??? ??
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ?
?? ??? ?. ? ?? ????? ?. ??
18
Chassis Venus-1BST
RF Mode No color
RF Mode Intermittent No color
???
Color System Auto / Pal ??? ???
??? System ???? (Auto / Pal)
???
Micon IC ?? ??? ?. 24 ?? 25 ?? Voltage ??? ??? (
1.6V )
Tuner ???? ?? ??? ???
???
???
Crystal X201 ?? ????????? ??? ???
???? ?? ??? ??? X201
???
Micon ???? ?? ??? ???
??? ??
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ?
?? ?
19
Chassis Venus-1BST
Defocus Picture
VOLTAGE CHART FBT Pin 1 274.5V
AC 20.37V DC Pin 2(B)
0V (GND) AC
108.5V DC Pin 3(V) 41.19V AC
0V DC Pin 4(v-) 30.46V
AC 0.13V DC Pin 5(GND)
- - - - Pin 6(Heater) 7.10V AC
0V DC Pin 7
41.85V AC 80mV DC Pin
8(ABL) 2.16V AC
6.27V DC Pin 9 - - - - - Pin 10
(180V) 23.1V AC
108.5V DC
FBT (T444) ???? ??? ??? (???? ???) ??????? ??? ??
? ????,
Normal
???? ???? ?? CRT ?????. ?? ??? ??????? ??? ???
Normal
Chassis ???? ?? ??? ??? ?? ???????? CPT ?? ??
???? Chassis ??
???
??? ???????? CPT ?? ?? ?? CPT ???? ?? ??????
chassis ??? ???
???

• - FBT ??? ???
• - Convergence ?? ??? (Menu Display)??? ???
• - RGB cut-off ?? ??? black white picture??? ???
  
• Contrast ?? Brightness user mode ??? ??? ??? ?
• ?? SVC Mode ???.

??? ??
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ??
20
Chassis Venus-1BST
Color Patch

• AUTO DEGAUSSING ABILITY CHECKING
• Create little patch by External degaussing coil
• Switch off the set for 1520 min.
• Switch on set after 20 min.
• Check No patch should be there.
• If still patch is there open back cover and check
  D. coil connector
• Insert connector properly and check

???
????? degaussing coil ?? patch ??????? ?? ?????
??? .
Auto Degaussing ??? ?? ability ??? ???
???
???
??????, ?? ??- ??? ????? Magnetic device ???
???
???
magnetic devices ?????
degaussing connector ?? ??????? , PTC, ?? relay
dry solder. ?? ??? ??? ???
Replace Part
???
CPT Magnet ??????? Use ??? Mentioned in
procedure.
???
???
??? ???? ??????? ??? Patch fully Remove ????
???? ?? ??
CPT ????
??? ??
21
Chassis Venus-1BST
Remote not operate
???
Panel ??? ?? ??? ?? ??? ?? ????,battery??
???????? ?? ??? ?? contact ??? ???
battery ????
???
???
???
Connector XPC11 ??? ???
?????? Remote ?? ???? ?? Function ??? ???
Connector ????
???
???
Remote PCB ?? ckt. ??? ??? ?????? Remote ????
IR sensor RM901A ?? ???? ?? Voltage ??? ??? (
Pin-1 5V , Pin-2 GND, Pin-3 45V)
???
IR sensor RM901A ???? ?? micon ic ?? ??? ?. 39
(45v)?? Voltage ??? ???
Moicon IC ????
??? ??
???? ??????? ?? ??? ???? ??? ?. ? ?? ????? ?. ?
22
Chassis Venus-1BST
Important design data Important design data Important design data Important design data Important design data Important design data Important design data Important design data
1 MFG Manufacturing mode 0-1 1(For MFG Mode) Note  
2 SPG Shipping mode for default settings 0-1 0 FOR FRAME, FOCUS AND NONFOC  
3 AGCT AGC Takeover 0-63 25 For GDC(Longsign-18,Onida-22)    
4 SCL Sub Color 0-63 58 Value Color
5 VSD AKB Black current to Off, EGL(Gain loop in CCC to 0ff) 0-63 32 0 Black
6 VA Vertical Amplitude for PAL signal 0-63 28(ADJUST) 1 Red
7 VS Vertical Slope for PAL Signal 0-63 38(ADJUST) 2 Yellow
8 SC S- Correction for PAL Signal 0-63 49 3 Green
9 VSH Vertical Shift for PAL signal 0-63 30(ADJUST) 4 Orange
10 HSH Horizontal Shift for PAL signal 0-63 34(ADJUST) 5 White
11 ZM Zoom vertical amplitude 0-63 9 6 Blue
12 WD Wide vertical amplitude 0-31 32(Fix) 7 Magenta
13 SMLS Sound Mute loudspeaker output 0-1 0
14 REM-OP 0-Sansui,1-Akai,2-Hyundai,3-Kenstar,4-Videocon,5-Next 0-5 4
??? ??