CTX 1565D User manual

CONTENTS
1.0 IMPORTANT NOTICE & INTRODUCTION 000.0... csc ceceeseecseressneeseesncsecseeeessseeeseneeseatensees 1
2.0 GENERAL MAINTENANCE PROCEDURE ...............:cccsscceescceseensessersuceeseeeseeecssessesseeesses 2
3.0 FUNCTION BLOCK DIAGRAM BLOCK 0... cceeeccececscesecececeeseenseccessesscneesceeeecceeaseeeseteess 3
4.0 TIMING MODE (CTX Presetting Timing) ..............---eccsccseccccecessseevscssnssseaeeeeeeeeeseeesseeeeenens 4
5; DADJUST IMENT csivessccevasteslaceics Seade cesta sail aiztsd ep seuritsogenisesssoeeseducuiSencasee seeeceeatenenenteaeetentenees 6
6:0 TROUBLESHOOTING \issssessiscccs sc ebedeesezneansdenticds eieeeesddcseccdieccsteuscaseavesnossossasatedeanatecaaeaes 8
6.1 MAIN TROUBLESHOOTING ROUTINE .......... cece cece ee eecsceeeessereeeeceseeeeeeeseeseeeeenenes 8
6.2 POWER SAVING CIRCUIT TROUBLESHOOTING ROUTINE ..........:::::cecceeeeeereees 9
6.3 POWER SUPPLY CIRCUIT TROUBLESHOOTING ROUTINE.........:cssscsssesseeerenes 11
6.4 VIDEO CIRCUIT TROUBLESHOOTING ROUTINE..........cscsssssceseeceereseesnersceesatsenes 13
6.5 DEFLECTION CIRCUIT TROUBLESHOOTING ROUTINE. ...........::cseeessreeesereeenes 15
6.5.1 Horizontal Deflection Circuit ............. ec eceessenneneeecereaseeeeeeneseeeaeanaenereennaees 15
NO:
ROSEN
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H-ASYNCHIONOUS.........eesecceeeeesceeceeeseeeenseescennaeeeesanseecseeessesesconecetensoreeerensenens 16
LITO ANALY. 2 co scch eco cias ek Fe sacs Fea tan si vases cca becd ogee Sexscnceseacd cuevasseatventestucetesvacdeeseedus ase 17
Out
Of
Phase
.............scesssccelecccseseccsssterecsnssscescsnrsnsnegsrsaccesanaeesoea
nn
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18
Width
Abnormal
...............ecccceceeseecesssseessscceesssncesessaaseeseerseeneessenaeseaverseeenenses
18
6.5.2 Vertical Deflection Circuit .......... ce ececeeeeseensnrseesersentenseeeessesseneceseeeerarenenes 19
NO Vertical SCAN ........ eee cceececceseeeesserseeeeoessssscaceneseeesssseeceeeesecsesesnanseesensenes 19
Side
pir
GiStOtION
«2.0.0.2...
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20
V-ASYNCHIONOUS...........seccccceeeessseesecceresesnesceensensccnecesecessseeeessnsnseesesesesenecentaens 21
Vertical
position
.....:.........eessssscssceesseeeseceeeeeeesseececesenessaanessesaceesonerrsresereesseres
21
Vertical
SIZ
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7.0
1C
CONFIGURATION
.................ccceceeceteccececececnereesearessccneeesasensussesesansaneanaereauseaseeeereseeeees
28
8.0
LAYOUT
FOR
MAIN
COMPONENTS
AND
ADJUSTED
..........ceccceececseseeeeeeeeeteneeneneeeneets
29
9.0
CIRCUIT
DIAGRAM.
ss
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cudvastacenasscsvetoccdaclaicetitelanodwsadecedauateeseunstysucecoseadeegevieds
cacceeseoee
29
40.0
RECOMMENDED
SPARE
PARTS
LIST
...........ceccesecseceeeessnsneneereeesteesesncenseeesneseeensneeees
30
11.0
CRT
CONTRAST
LIST
uu...
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31

Copyright ©1995 by Chuntex Electronic Co., Ltd.
The
CTX
TROUBLESHOOTING
GUIDE
is
published
by
Chuntex
Electronic
Co.,
Ltd.
All
rights
reserved.
No
part
of
this
manual
may
be
used,
copied,
reproduced,
or
transmitted
in
any
form
or
by
any
means
for
any
purpose
without
the
express
written
permission
of
the
publisher.
.
The
publisher
has
been
trying
its
best
to
make
this
publication
perfect,
and
in
this
manner
takes
no
responsi.
tity
for
the
use
of
any
of
the
materials
or
methods
described
in
this
manual,
or
for
the
products
thereof.
Neither
will
the
publisher
be
responsible
for
any
damages
caused
by
misuse
or
misquotation.
Information
in
this
manual
is
subject
to
change
by
the
publisher
without
any
notice
in
advance.
CTX is a registered trademark of Chuntex Electronic Co., Ltd.

1565D
1.0 IMPORTANT NOTICE &
INTRODUCTION
IMPORTANT NOTICE
Please read before attempting service
1.
While the monitor is in operation, do not
attempt to connect or disconnect any wires.
.
Make
sure
the
power
cord
is
disconnected
before replacing any parts in the monitor.
.
When
the
power
is
on,
do
not
attempt
to
short
any
portion
of
the
circuit.
This
shorting
may
cause
damage
to
the
transistors
in
the
monitor.
.
When
servicing
the
H.V.
area,
be
certain
that
the C.R.T anode is safely discharged before
removing the anode cap.
.
Caution
must
exercised
when
servicing
this
monitor.
INTRODUCTION
Enhanced repair capabilities
This
troubleshooting
guide
is
edited
for
model
1565D
when
service
is
necessary.
there
are
four
primary
parts
included
in
this
troubleshooting
guide
which
offer
the
-easiest
way
to
locate
problem
points
and
repair
the
machine
to
the
best
possible
condition.
1.
The Adjustment section offers the adjustable
method, steps and all data of the factory's
initial
settings
which
can
make
the
machine
get the best performance at that time. By the
way, before adjusting, the machine must be
warmed up for at least 10 minutes and the
CRT face must be in an east ward direction.
. The Troubleshooting section has four main
parts including: power supply, power saving,
CRT, deflection & video circuit. Each offers
fast repair routine and the IC, transistor
voltage records against all specified signal
modes. These voltage readings are measured
wth a HP 34401A multimeter with input
impedance 10MQ (0.1V~ 1000V range) and
waveforms shown on circuit schematics are
measured by a Tektronix TDS 520 digital
oscilloscope, the monitor receives VGA-480
full white square pattern.
CTX
1.0
IMPORTANT
NOTICE
&
INTRODUCTION
.
The
CRT
contrast
list
offers
repairmen
/
technicians
the
contrast
data
when
CRT
replacement
is
necessary
from
a
different
type
of
CRT.
.
The
Spare
parts
list
offers
the
CTX
part
“number
(P/N)
which
is
used
frequently
by
repairmen
/
technicians.
For
details
please
refer
to
the
service
guide
or
service
manual.
If
there
is
any
engineering
change
regarding
this
model,
CTX
will
issue
the
updated
information
by
a
non-periodical
Technical
Bulletin.

2.0
GENERAL
MAINTENANCE
PROCEDURE
2.0
GENERAL
MAINTENANCE
PROCEDURE
START
CHECK AND RECORD THE .
FAILURE MODE OF
CUSTOMER
VISUAL CHECK THE
APPEARANCE OF CABINET/
CRT
CHECK PICTURE
PERFORMANCE
NG
OK
REPLACEMENT
|
BURN
IN
24
HOURS
NG RE-CHECK PICTURE
PERFORMANCE
RECORD
1565D
REPLACEMENT
CTX ©

1565D
3.0 FUNCTION BLOCK DIAGRAM BLOCK
3.0 FUNCTION BLOCK DIAGRAM BLOCK
AC UP
PIN
KEYSTONE
BAD
GAD
CTX
> 486V
> +36V
POWER > 425
SUPPLY Db +12V
> +6V
POWER SAVING
H SYNC
. MICRO PROCESSOR &
VSYNC .
PINCUSHION
CORRECTION
Q503,504
Q512
V-SIZE
V-CENTER
EEPROM IC501,IC502
HORIZONTAL
& VERTICAL
PROCESSOR
1C201
(LA7851)
CS CONTROL
Q704,Q705
Q706,C708
C710,C712
0c TO Dc
1€401,Q401
R L401,D407 J
aS
VERTICAL
HORIZONTAL
HOR.O/P
HIGH
VOLTAGE
HOR-YORK
p
DRIVER
Q701,0702
P|
DEFECTION
H.V
O/P
{C801 Q702,T701
FBT(T702)
> VERT. YORK
H.V REGULATOR
Q711,712
Q713,714
€705,Q708
VIDEO
PRE-AMP
1C601 CRT
(M51387)

H TOTAL
4.0
TIMING
MODE
(CTX
Presetting
Timing)
1565D
4.0
TIMING
MODE
(CTX
Presetting
Timing
+)
a
[roams
[awe
[same
|
sane
|
ome
|
ome
|
ome
[Tn
[me
[me
[ew
|
eome
|
mune
|
me
ee
[foe
|e
|
»
|» |»
|
MODE
acute]
vam
|
oso
|
im
|
om
|
vm
|
vam
|
fewcennea
|
we
[we
|
w
| |
|
=
[wr
[Poe
[rn
[rom
[roe
[re
mn
[roe]
mt
[rm
|
mi
[rm
ma
FRAME
BORDER-H
| FRAME ae a
BORDER-V
conn
|
elo
el
[eel
|
Biel
|
ee
fe
a
we | 3. 128 420 36
H
SYNC
WIDTH
96
3.81
us}
96
3.81
us
3.81
us
3.2
us
240us!|
1
2.092
us
HSYNC
POLARITY
a7
+
+
Es
cs
el
ie
fc
Ma
a
A
ee
vemowora
|
2
jooeme|
2
[raceme
4
[arosm)
+
larcom|
©
[oaasme|
@
[ataam
|
-
|
+
|
+
f{-
-
|
eae ee
SERRATION ?
COMP SYNC
POLARITY
4
CTX

1565D
4.0
TIMING
MODE
(CTX
Presetting
Timing)
* V1024-70
=
[Te | ~ | «|
[ee [ee fem |
[seconnse
|
we
fe
PIXEL | msfus | PIXEL. PIXEL
- FRAME
BORDER-H
FRAME
BORDER-V
a
renee i es ee
H SYNC
POLARITY
7
+
+
a
a 8
Ni
I
:
I
8
I
:
ms/us
a
ale
¢
V TOTAL
veneer
a
V SYNC
POLARITY
+
+
+
COMP SYNC
POLARITY
CTX 5

5.0 ADJUSTMENT
5.0 ADJUSTMENT
5.1 1565D ADJUSTMENT
Brightness
reduce
voltage adjustment: VR101,VR102 /-
VGA-480
1. Use VGA-480 timing for input signal.
2. Attach the multimeter (with a DC voltage
range of 200V) adjust VR101 to get 85.5V
£0.5V at TP1.
3. Adjust VR102 to get 12V+0.05V at TP2.
Hi-volitage adjustment: VR702 / VGA-480
a. Turn the power switch off before attaching
multimeter with a high voltage probe by a
factor 1000:1 between CRT anode and
GND.
b. Adjust VR702 to make sure the
measurement readings are 25.0V + 0.2V
(ie CRT anode voltage is 25.0KV+0.2KV).
Horizontal hold adjustment: VR201,VR202
a. Connect TP4 to GND and adjust VR202 to
get picture stand or scroll toward left or
right slowy when input is 8514A timing
signal.
b. Change input timing to VESA1024 and
adjust VR201 to get picture stand.
. H-PHASE adjustment: EXT SW / ALL MODE
Adjust EXTERNAL H-PHASE SW to shift
. picture to the center of screen, every mode.
V-line adjustment:VR801 / VESA1024
First adjust V-CENTER EXTERNAL VR to
make picture to the V-center of the screen, and
then adjust VR801 to correct the V-linearity of
crossh-hatch pattem.
|
|
|
|
|
|
y
1565D
H-WIDTH adjustment: VR401 / VI1024
a. Tum EXTERNAL H-WIDTH VR to min.
position.
b. Adjust VR401 to get the picture's width is
260+5mm.
V-SIZE adjustment: EXT SW / ALL MODE
Adjust EXT V-SIZE SW to get vertical size of
each mode is 202+5mm.
PARALLELOGRAM adustment: VR204 /
ALL MODE
Adjust VR204 to get a picture that right edge
parallel with left edge of each mode; which
the spec. is +2mm.
’ FOCUS adjustment: FOCUS VR / VGA-480
Adjust FOCUS VR on the FBT to attain a
balanced focus for all zones on the screen.
White balance adjustment:
a. Pre adj. & brightness settings (Before
adjusting, CRT must be degaussed.)
(1) Please set the VR601, 602, 603, 604, 605,
606 on mechanical center, and _ the
Brightness VR to the click point, the
Contrast VR to Max..
(2) Operating on VGA-480 mosaic pattern and
adjust the SCREEN VR to set the raster
luminance between 1 ~ 2FL, then adjust
VR604,605,606 (BIAS VR) to make the
rasters C.I.E. coordinates value as
x=0.281 + 0.01, y=0.311 += 0.01 were
measured by color analyzer.
(3) Change timing to VGA-400 color bar
pattem, correct SCREEN VR whitch on the
FBT to make raster brightness disapper
and the "1" row of color bar pattem (as
below figure) visible obscurely.
2 —visible
1 —visible
obscurely
CTX

1565D
b. White balance fine regulation:
(1) Receive VGA-480 timing, full white square
pattem.
(2) Adjust Brightness VR. to MIN., Contrast VR.
to MAX..
(3) Adjust VR601,602,603 to make picture C.1.E.
coordinates value as x=0.281 + 0.01, y=0.311
+£0.01, were measured by color Analyzer.
(4) Change the BRIT. VR to the click point and
adjust the CONT. VR to make the luminance
of picture between 1 ~ 2FL, then adjust
VRE04, 605, 606 (BIAS VR) to get X=0.281 +
0.005, Y=0.311 + 0.005, were measured by
color Analyzer.
(5) If the white balance is not met, repeat step (2)
~(4).
Please set Brightness VR to click point and
Contrast VR to Max., and check item (3) of Per
adj & brightness settings, then receive VGA-480
mosaic pattem and check the luminance of
Mosaic pattern is between 50~ 60FL. if above
check item isn't meet, please modify VR601 ~
VR605 and retum to white balance fine regulation
section.
ADJUSTMENT FOR CONVERGENCE
(1) Use a magenta crosshatch on the display.
(2) Adjust the focus for the best overall focus on
the screen.
(3)Aiso adjust the brightness to the desired
condition.
(4) Vertical red and blue lines are converged by
varying the angie between the two tabs of the
4 pole magnets on the PCM assembly. (See
diagram below)
(5) Horizontal red and blue lines are converged
by moving the two tabs at the same time
keeping the angle between them constant.
(6) Use a white crosshatch pattem on the display.
(7) Vertical green and magenta lines are
converged by varying the angle between the
two tabs of the 6-pole magnets.
CTX
5.0 ADJUSTMENT
(8) Horizontal green and magenta lines are
converged by moving the two tabs at the
same time. keeping the angle between them
constant.
DEFLECTION YOKE
Xe 6-POLE
CONVERGENCE MAGNETS
4POU E
CONVERGENCE MAGNETS
PURITY MAGNETS
PCM:PURITY CONVERGENCE MAGNET
Note: Please don't adjust the purity magnets
when service occurs.

6.0 TROUBLESHOOTING
6.0 TROUBLESHOOTING
1565D
6.1 MAIN TROUBLESHOOTING ROUTINE
START
CHECK POWER INDICATOR
LED
LED COLOR 7
DOES IMAGE APPEAR
CHECK COLOR
PERFORMANCE
CHECK GEOMETRIC
PERFORMANCE
NG
AMBER
ING
POWER SUPPLY CKT.
TROUBLESHOOTING
ROUTINE
POWER SAVING CKT.
TROUBLESHOOTING
ROUTINE
POWER SUPPLY CKT.
TROUBLESHOOTING
ROUTINE & ADJUSTMENT
CHECK 85.5V,36V,25v,
12V,5V,6.2V
DOES RASTER APPEAR ? DEFLECTION CKT.
(ADJUST SCREEN VR ON TROUBLESHOOTING
FBT) ROUTINE & ADJUSTMNET
VIDEO CKT.
TROUBLESHOOTING
ROUTINE
DEFLECTION CKT.
TROUBLESHOOTING
ROUTINE
CTX

1565D
6.0 TROUBLESHOOTING
6.2 POWER SAVING CIRCUIT TROUBLESHOOTING ROUTINE
START
IS THE POWER SAVING
FUNCTION NORMAL ?
IS THE INPUT SIGNAL
NORMAL ?
CHECK PIN 34,35,33
VOLTAGE OF IC501
CHECK BASE VOTAGE
OF Q108, Q111
CHECK BASE VOLTAGE
OF Q106, Q110
CHECK THE SIGNAL CABLE
CHECK IC501 AND ITS.
PERIPHERAL PARTS
CHECK THE Q108,Q111 AND
THEIR PERIPHERAL PARTS
CHECK THE Q106, Q110 AND
THEIR PERIPHERAL PARTS
CTX

6.0 TROUBLESHOOTING 1565D
VOLTAGE MEASURED RECORD
TEST CONDITIONS: TIMING — : VGA-480
PATTERN: CROSS HATCH
Unit: Voit
Pera, (aa a a a ee ee ee
STATUS
fuorunc | eno fame | ome | mee | are | moo [em | an | eer
Tree ase [ae
fusreno| eno | ts7 | om | aox0 | 200 | 2020 |
Por
[ew
|
ter
|
ow
|
arse
|
200
|
mae
|
see
|
wee
|
28
Q110 (2SB772)
CTX

1565D 6.0 TROUBLESHOOTING
6.3 POWER SUPPLY CIRCUIT TROUBLESHOOTING ROUTINE
START
CHECK AC COMPONENTS
CHEC VOLTS O NG
5 stash ae . NTC101,L103,C103,C102,C101,
L102,SW101, F101
OK
01
CHECK GATE VOLTAGE OF CHECK VOLTAGE OF C101 CHECK @101,Q103,D1
Q104
D102,D104,D105
CHECK Q104,D107,R120
R121,R123,R126
CHECK THE AC OUTPUT AT | NG
2ND WINDING OF T101
CHECK Q104,T101
CHECK
D108 ~112,L104,L106,
L401,C119~125,ZD106
CTX 11

6.0
TROUBLESHOOTING
1565D
VOLTAGE MEASURED RECORD
TEST CONDITIONS: TIMING : VGA-480 |
PATTERN: CROSS HATCH
. Unit: Volt
12
CTX:

1565D
6.0
TROUBLESHOOTING
6.4
VIDEO
CIRCUIT
TROUBLESHOOTING
ROUTINE
START
CHECK
COLLECTOR
OK
CHECK
VOLTAGE
OF
C616~C618,R643~R645,
Q604,Q605,Q606
CRT
SOCKET
&
CRT
NG
CHECK BASE VOLTAGE OF
Q601,Q602,Q603
NG
CHECK PIN 21,25,29
~R6I6
VOLTAGE
OF
IC601
CHECK
REI
iet
NG
CHECK PIN 15 CLAMPING OK
VOLTAGE OF IC601
CHECK P602,R648,IC601
NG
OK CHECK P601 AND SIGNAL
CABLE OR NO SIGNAL
INPUT
CHECK SIGNAL INPUT AT
PIN 3,7,14 OF iC601
CHECK
C634,C627,L604,IC601
CHECK IC601,P602
* The Troubleshooting Routine is match P/N 11S33-019A CRT board.
CTX 13

6.0 TROUBLESHOOTING _ 1565D
The following voltage records was measured with full white square pattern.
Transistor & Integration circuit
Unit: Volt
Q601 (PH2369) Q602 (PH2369) Q603 (PH2369)
veaseo] aoe | oar | aor | om | ane |
Q604 = Q605 ad Q606 ase
ea-ao| soe | we [oe | oa | we | ea | oor
IC601 (M51387)
et eae Ce ee
veaaeo | no | 120 | 270 | sox | nc | zo | 27 | 496 |
1C601 (M51387)
14 CTX

1565D
6.5
DEFLECTION
CIRCUIT
TROUBLESHOOTING
ROUTINE
6.5.1 Horizontal Deflection Circuit
CHECK Q701,D702,FBT
CHECK Q701 ,Q702,T701,
Q206,Q207,R703,R701,
C731
CHECK 1C201 OR IT'S
PERIPHERAL SUCH AS
R230,R231,C204,C206
C207,C219,C221
OK
No Raster
START
6.0 TROUBLESHOOTING
FOR DC TO DC CONTROL LOOP
CHECK PIN 2 VOLTAGEF
OF FBT(DISCONNECT
COLLECTOR OF Q401
WHEN MEASURED
CHECK CATHOD
VOLTAGE OF D407
OK
IS THE OUTPUT
VOLTAGE OF D109
CHECK BASE |
36VDC
VOLTAGE OF Q701
NG
| POWER SUPPLY
TROUBLESHOOTING
ROUTING
CHECK PIN 12
VOLTAGE OF IC201
CHECK PIN 1 H-SYNC.
INPUT OF [C201
NG
CHECK Q511,Q505
R564,C201
CHECK PIN 38 OF IC501
CHECK ICSO1 OR ITS
PERIPHERAL PARTS
CHECK PIN 40 OF 1C501
CHECK
P503,P602,P601 AND
SIGNAL CABLE
CHECK D407 &
RELATED TRACE TO
FBT |
CHECK I1C401,Q401 &
THEIR PERIPHRAL |
COMPONENTS
CTX
15

6.0 TROUBLESHOOTING , 1565D
H-Asynchronous
START
SHORT TP4 TO GROUND
, THEN ADJUST 8514A
(VR202); V1024(VR201)
OF H-HOLD
OK CHECK PIN 1 OF
1C201 SIGNAL
CHECK 1C501 ,P503,
SIGNAL CABLE P601
CHECK H-FIV
VOLTAGE AT PIN 24
OF IC501
CHECK AFC VOLTAGE | OK
AT PIN 4,7 OF 1C201
CHECK 1C201 AND ITS
PERIPERAL PARTS
CHECK 1C201,D501,
Q515,Q203
CHECK IC501 AND
ITS PERIPHERAL
COMPONENTS
CHECK R212,R213
C204
16 CTX

1565D 6.0 TROUBLESHOOTING
Linearity
START
(USE CROSS-HATCH PATTERN)
(LINEAR COIL)
YES
DOES PICTURE LEFT SQUARE CHECK L701,0703
MORE BIG THAN RIGHT
NO
Bee DOR ONTAL VOLTAGE OF IC501
YES
CHECK GATE VOLTAGE OF CHECK Q508,Q509, CHECK IC501 AND
Q704,Q705,Q706 ARE
"L'"L","L"
WITH
HORIZONTAL
ie
Q510
AND
THEIR
IT'S
PERIPHERAL
FREQ. 64K PERIPHERAL PARTS COMPONENTS
CHECK Q704,Q705,Q706 &
ITS PERIPHERAL COMPONENT:
SUCH AS C708,C710,C712
REMARK: x "L" means the voltage between gate and source is<0.7V which can't tum on the MOSFET.
+ *& "H" means the voltage between gate and source is=0.7V which can turn on the MOSFET.
CTX . 17