Sony FD Trinitron Wega KV-34HS420 User manual

TRINITRON®COLOR TELEVISION
SERVICE MANUAL DA-4 CHASSIS
MODEL NAME REMOTE COMMANDER DESTINATION CHASSIS NO.
9-965-986-01
KV-27HS420 RM-Y197 US SCC-S76C-A
KV-27HS420 RM-Y197 CANADA SCC-S70X-A
KV-29DRC430 RM-Y197 LATIN NORTH SCC-S71S-A
KV-29DRC430 RM-Y197 LATIN SOUTH SCC-S71T-A
KV-30HS420 RM-Y197 US SCC-S76D-A
KV-30HS420 RM-Y197 CANADA SCC-S70Y-A
KV-30HS420 RM-Y197 HAWAII SCC-S69R-A
KV-32HS420 RM-Y197 US SCC-S76E-A
KV-32HS420 RM-Y197 CANADA SCC-S78A-A
KV-34HS420 RM-Y197 US SCC-S76F-A
KV-34HS420 RM-Y197 CANADA SCC-S78B-A
This manual is for units starting with the following S/N’s:
For KV-27HS420/30HS420/32HS420/34HS420 For KV-29DRC430
4,000,001 to 4,499,999
8,000,001 to 8,499,999
9,000,001 to 9,499,999
4,500,001 to 7,999,999
8,500,001 to 8,999,999
9,500,001 to 9,999,999
HISTORY INFORMATION FOR THE FOLLOWING MANUAL:
ORIGINAL MANUAL ISSUE DATE: 7/2005
REVISION DATE SUBJECT
7/2005 No revisions or updates are applicable at this time.

TRINITRON®COLOR TELEVISION
SERVICE MANUAL DA-4 CHASSIS
MODEL NAME REMOTE COMMANDER DESTINATION CHASSIS NO.
9-965-986-01
KV-27HS420 RM-Y197 US SCC-S76C-A
KV-27HS420 RM-Y197 CANADA SCC-S70X-A
KV-29DRC430 RM-Y197 LATIN NORTH SCC-S71S-A
KV-29DRC430 RM-Y197 LATIN SOUTH SCC-S71T-A
KV-30HS420 RM-Y197 US SCC-S76D-A
KV-30HS420 RM-Y197 CANADA SCC-S70Y-A
KV-30HS420 RM-Y197 HAWAII SCC-S69R-A
KV-32HS420 RM-Y197 US SCC-S76E-A
KV-32HS420 RM-Y197 CANADA SCC-S78A-A
KV-34HS420 RM-Y197 US SCC-S76F-A
KV-34HS420 RM-Y197 CANADA SCC-S78B-A
This manual is for units starting with the following S/N’s:
For KV-27HS420/30HS420/32HS420/34HS420 For KV-29DRC430
4,000,001 to 4,499,999
8,000,001 to 8,499,999
9,000,001 to 9,499,999
4,500,001 to 7,999,999
8,500,001 to 8,999,999
9,500,001 to 9,999,999
Self Diagnosis
Supported model
KV-30HS420
RM-Y197

3
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
TABLE OF CONTENTS
SECTION TITLE PAGE SECTION TITLE PAGE
Specifications ................................................................................. 4
Warnings and Cautions .................................................................. 6
Safety Check-Out ........................................................................... 7
Self-Diagnostic Function................................................................. 8
SECTION 1: DISASSEMBLY ................................................................11
1-1. Rear Cover Removal.............................................................11
1-2. Chassis Assembly Removal..................................................11
1-3. Service Position ....................................................................11
1-4. Picture Tube Removal.......................................................... 12
Anode Cap Removal Procedure .......................................... 12
Cable Wire Dressing ............................................................ 13
SECTION 2: SET-UP ADJUSTMENTS ................................................ 26
2-1. Beam Landing ...................................................................... 26
2-2. V-PIN and V-CEN Adjustment .............................................. 27
2-3. Convergence........................................................................ 27
2-3.1. Vertical and Horizontal Static Convergence ............ 27
2-3.2. Operation of BMC (Hexapole) Magnet .................... 27
2-3.3. TLH Plate Adjustment .............................................. 27
2-3.4. Screen-Corner Convergence................................... 28
2-3.5. Dynamic Convergence Adjustments........................ 28
2-4. Focus Adjustment................................................................. 29
2-4.1. Dynamic Focus/Dynamic Quadra-Pole Data........... 29
2-5. Screen (G2).......................................................................... 30
2-6. Picture Quality Adjustments ................................................. 30
2-6.1. Video Input - Sub Contrast Adjustment.................... 30
2-6.2. Video Input - Sub Hue/Sub Color Adjustment.......... 31
2-6.3. RF Input - Sub Contrast Adjustment ........................ 31
2-6.4. RF Input - Sub Hue/Sub Color Adjustment.............. 32
2-7. White Balance (CRT) and Sub Bright Adjustment................ 32
2-7.1. Color Offset Adjustment Procedure ......................... 32
2-8. H Raster Center Adjustment ................................................ 33
2-9. Picture Distortion Adjustments ............................................. 33
2-9.1. NTSC (DRC) Full Mode Adjustment ........................ 33
CXA2170D-1................................................................... 33
CXA2170D-2................................................................... 34
2-9.2. 1080i HD Mode Adjustment..................................... 34
2-9.3. Vertical Compressed Mode Check and Confirmation
(For 4x3 CRT Only) ................................................. 34
2-9.4 Normal, Zoom and Wide Zoom modes.................... 34
SECTION 3: SAFETY RELATED ADJUSTMENTS.............................. 35
3-1. Preparation Before Confirmation.......................................... 35
3-1.1 Hold-Down Operation Confirmation......................... 35
3-2. B+ Max Confirmation ........................................................... 35
3-3. B+ Voltage Check ................................................................ 35
3-4. High Voltage (HV) Check ..................................................... 35
3-5. Preparation for HV and Ik Protector Check.......................... 35
3-6. HV Protector Check ............................................................. 35
3-6-1. Cut Off Condition ..................................................... 35
3-6-2. High Light Condition ................................................ 36
3-7. IK Protector Check ............................................................... 36
3-8. Hold Down Check ................................................................ 36
3-9. Restoration........................................................................... 36
3-10.HV Service Flowchart........................................................... 37
HV Service Flowchart Table ................................................. 38
SECTION 4: CIRCUIT ADJUSTMENTS............................................... 39
4-1. Setting Service Adjustment Mode ........................................ 39
4-1.1. Service Adjustment Mode In.................................... 39
4-1.2. Service Adjustment Mode Memory.......................... 39
4-1.3. Reading the Memory ............................................... 39
4-1.4. Adjusting the Picture................................................ 39
4-1.5. Resetting the Data................................................... 39
4-1.6. Resetting the MID NVM Data .................................. 39
4-1.7. Resetting the System NVM Data............................. 39
4-1.8. Copy Function.......................................................... 39
4-2. Memory Write Confirmation Method .................................... 40
4-3. Remote Adjustment Buttons and Indicators ......................... 40
4-4. Service Data......................................................................... 41
KV-27HS420/29DRC430 Only ............................................. 41
KV-30HS420 Only ................................................................ 55
KV-32HS420 Only ................................................................ 69
KV-34HS420 Only ................................................................ 83
4-5. ID Map Table ........................................................................ 96
SECTION 5: DIAGRAMS ..................................................................... 97
5-1. Circuit Boards Location ........................................................ 97
5-2. Printed Wiring Boards and
Schematic Diagrams Information ......................................... 97
5-3. Block Diagrams .................................................................... 98
5-4. Schematics and Supporting Information ............................ 101
A Board Schematic Diagram (1 of 2).................................. 101
A Board Schematic Diagram (2 of 2).................................. 102
B Board Schematic Diagram (1 of 2) ................................. 105
B Board Schematic Diagram (2 of 2) ................................. 106
CH Board Schematic Diagram ........................................... 109
D Board Schematic Diagram (1 of 2) .................................. 111
D Board Schematic Diagram (2 of 2) ..................................112
HAX Board Schematic Diagram .........................................114
HB Board Schematic Diagram ............................................115
HCX Board Schematic Diagram..........................................116
M Board Schematic Diagram (1 of 4)..................................118
M Board Schematic Diagram (2 of 4)..................................119
M Board Schematic Diagram (3 of 4)................................. 120
M Board Schematic Diagram (4 of 4)................................. 121
P Board Schematic Diagram ............................................. 124
PA Board Schematic Diagram ........................................... 125
UY Board Schematic Diagram ........................................... 126
WY Board Schematic Diagram .......................................... 128
5-5. Semiconductors (1 of 2) ..................................................... 130
Semiconductors (2 of 2)..................................................... 131
SECTION 6: EXPLODED VIEWS ...................................................... 132
6-1. Chassis (KV-27HS420/29DRC430 Only) ........................... 132
6-2. Picture Tube (KV-27HS420/29DRC430 Only).................... 133
6-3. Chassis (KV-30HS420/34HS420 Only).............................. 134
6-4. Picture Tube (KV-30HS420/34HS420 Only) ...................... 135
6-5. Chassis (KV-32HS420 Only).............................................. 136
6-6. Picture Tube (KV-32HS420 Only) ...................................... 137
SECTION 7: ELECTRICAL PARTS LIST .......................................... 138

4
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
SPECIFICATIONS
Design and specifications are subject to change without notice.
1) 1 Vp-p 75 ohms unbalanced, sync negative
2) Y: 1 Vp-p 75 ohms unbalanced, sync negative
C: 0.286 Vp-p (Burst signal), 75 ohms
3) Y: 1.0 Vp-p, 75 ohms unbalanced, sync negative;
P
B: 0.7 Vp-p, 75 ohms
P
R: 0.7 Vp-p, 75 ohms
4) 500 mVrms (100% modulation), Impedance: 47 kilohms
5) More than 408 mVrms at the maximum volume setting (variable)
More than 408 mVrms (fix); Impedance (output): 2 kilohms
KV-29DRC430 KV-27HS420 KV-30HS420 KV-32HS420
Power Requirements 220V, 50-60Hz
Number of Inputs/Outputs
Video 1) 4
S Video 2) 3
Y,PB, PR 3) 2
Audio 4) 7
Audio Out 5) 1
Monitor Out 1
Control-S (In/Out) YES
Memory Stick NO
Speaker Output (W) 10w x 2
15W Subwoofer 10W x 2
15W Subwoofer 10W x 2 15W Subwoofer 10W x 2 15W Subwoofer
Power Consumption (W)
In Use (Max) 240W
In Standby 1W
Dimensions (W x H x D) mm 784 x 601.5 x 520 mm 784 x 601.5 x 520 mm 898 x 604 x 564.5 mm 898 x 698 x 598 mm
in 307/8 x 23 5/8 x 20 1/2 in 307/8 x 23 5/8 x 20 1/2 in 35 3/8 x 233/4 x 22 1/4 in 35 3/8 x 27 1/2 x 23 1/2 in
Mass kg 50.2 kg 50.2 kg 68 kg 74.8 kg
lbs 111 lbs 111 lbs 150 lbs 165 lbs 194 lbs
88 kg
994 x 654 x 604 mm
39 1/8 x 25 3/4 x 233/4 in
1
1
YES
NO
240W
1W
10W x 2
15W Subwoofer
4
3
2
7
KV-34HS420
120V, 60Hz
As an ENERGY STAR Partner, Sony has determined
that this product or product models meets the
ENERGY STAR guidelines for energy efficiency.
ENERGY STAR is a U.S. registered mark.
T
rademark Information
WOW, TruSurround and the symbol are trademarks of SRS
Labs, Inc. WOW and TruSurround technology are incorporated
under license from SRS Labs, Inc.
Manufactured under license from BBE Sound, Inc. Licensed by BBE
Sound, Inc. under USP4638258, 5510752 and 5736897. BBE and BBE
symbol are registered trademarks of BBE Sound, Inc.
This TV incorporates High-Definition
Multimedia Interface (HDMI™)
technology. HDMI, the HDMI logo and
High-Definition Multimedia Interface are trademarks or registered
trademarks of HDMI Licensing LLC.
Wega, FD Trinitron, Steady Sound, Digital Reality Creation, Cap-
tion Vision, and CineMotion are registered trademarks of Sony
Corporation. ClearEdge VM and HD Detailer are trademarks of
Sony Corporation.

5
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
Television system
American TV standard, NTSC
Channel coverage
VHF: 2-13/ UHF: 14-69/ CATV: 1-125
Picture tube
FD Trinitron
®
tube
Visible screen size
27-inch picture measured diagonally (KV-27HS420/29DRC430 Only)
30-inch picture measured diagonally (KV-30HS420 Only)
32-inch picture measured diagonally (KV-32HS420 Only)
34-inch picture measured diagonally (KV-34HS420 Only)
Actual screen size
29-inch measured diagonally (KV-27HS420/29DRC430 Only)
32-inch measured diagonally (KV-30HS420 Only)
34-inch measured diagonally (KV-32HS420 Only)
36-inch measured diagonally (KV-34 HS420 Only)
Antenna
75 ohm external terminal for VHF/UHF
Supplied Accessories
Remote Commander RM-Y197
Two Size AA (R6) Batteries
Optional Accessories
AV Cable: VMC-810/820/830 HG
Audio Cable: RKC-515HG
Component Video Cable: VMC-10/30 HG
TV Stand: SU-27HX1 (KV-27HS420/29DRC430 Only)
TV Stand: SU-30HX1 (KV-30HS420 Only)
TV Stand: SU-32HX1 (KV-32HS420 Only)
TV Stand: SU-34HX1 (KV-34HS420 Only)

6
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
WARNINGS AND CAUTIONS
CAUTION
Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield, or carbon painted on the CRT, after
removing the anode.
WARNING!!
An isolation transformer should be used during any service to avoid possible shock hazard, because of live chassis. The chassis of
this receiver is directly connected to the ac power line.
!SAFETY-RELATED COMPONENT WARNING!!
Components identified by shading and ! mark on the schematic diagrams, exploded views, and in the parts list are critical for safe
operation. Replace these components with Sony parts whose part numbers appear as shown in this manual or in supplements
published by Sony. Circuit adjustments that are critical for safe operation are identified in this manual. Follow these procedures
whenever critical components are replaced or improper operation is suspected.
ATTENTION!!
Apres avoir deconnecte le cap de l’anode, court-circuiter l’anode du tube cathodique et celui de l’anode du cap au chassis metallique
de l’appareil, ou la couche de carbone peinte sur le tube cathodique ou au blindage du tube cathodique.
Afin d’eviter tout risque d’electrocution provenant d’un chássis sous tension, un transformateur d’isolement doit etre utilisé lors de tout
dépannage. Le chássis de ce récepteur est directement raccordé à l’alimentation du secteur.
! ATTENTION AUX COMPOSANTS RELATIFS A LA SECURITE!!
Les composants identifies par une trame et par une marque ! sur les schemas de principe, les vues explosees et les listes de pieces
sont d’une importance critique pour la securite du fonctionnement. Ne les remplacer que par des composants Sony dont le numero
de piece est indique dans le present manuel ou dans des supplements publies par Sony. Les reglages de circuit dont l’importance
est critique pour la securite du fonctionnement sont identifies dans le present manuel. Suivre ces procedures lors de chaque
remplacement de composants critiques, ou lorsqu’un mauvais fonctionnement suspecte.

7
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly soldered
connections. Check the entire board surface for solder splashes and
bridges.
2. Check the interboard wiring to ensure that no wires are “pinched” or
touching high-wattage resistors.
3. Check that all control knobs, shields, covers, ground straps, and
mounting hardware have been replaced. Be absolutely certain that
you have replaced all the insulators.
4. Look for unauthorized replacement parts, particularly transistors,
that were installed during a previous repair. Point them out to the
customer and recommend their replacement.
5. Look for parts which, though functioning, show obvious signs of
deterioration. Point them out to the customer and recommend their
replacement.
6. Check the line cords for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.
7. Check the B+ and HV to see if they are specified values. Make sure
your instruments are accurate; be suspicious of your HV meter if
sets always have low HV.
8. Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
Leakage Test
The AC leakage from any exposed metal part to earth ground and from
all exposed metal parts to any exposed metal part having a return to
chassis, must not exceed 0.5 mA (500 microamperes). Leakage current
can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instructions.
2. A battery-operated AC milliampmeter. The Data Precision 245 digital
multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75 V,
so analog meters must have an accurate low voltage scale. The
Simpson’s 250 and Sanwa SH-63TRD are examples of passive
VOMs that are suitable. Nearly all battery-operated digital multimeters
that have a 2 VAC range are suitable (see Figure A).
How to Find a Good Earth Ground
A cold-water pipe is a guaranteed earth ground; the cover-plate retaining
screw on most AC outlet boxes is also at earth ground. If the retaining
screw is to be used as your earth ground, verify that it is at ground by
measuring the resistance between it and a cold-water pipe with an
ohmmeter. The reading should be zero ohms.
If a cold-water pipe is not accessible, connect a 60- to 100-watt trouble-
light (not a neon lamp) between the hot side of the receptacle and the
retaining screw. Try both slots, if necessary, to locate the hot side on the
line; the lamp should light at normal brilliance if the screw is at ground
potential (see Figure B).
To Exposed Metal
Parts on Set
AC Voltmeter
(0.75 V)
Earth Ground
0.15 µF1.5 kΩ
g
AC Outlet Box Ohmmeter
Cold-water Pipe
Figure A. Using an AC voltmeter to check AC leakage. Figure B. Checking for earth ground.

8
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
SELF-DIAGNOSTIC FUNCTION
Display of Standby/Timer LED Flash Count
Diagnostic items Flash count
Lamp OFF 3 sec.
Lamp ON 0.3 sec.
Lamp OFF 0.3 sec.
+B Overcurrent 2 times
Low +B Overvoltage 3 times
Vert. Deflection Stopped 4 times
White Balance Failure 5 times
Low +B OCP/OVP 6 times
Horiz. Deflection Stopped 7 times
Stopping the Standby/Timer LED Flash
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER LAMP from flashing.
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to flash. The number
of times the LED flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER LED flash indicators is listed in the
instruction manual for the user’s knowledge and reference. If an error symptom cannot be reproduced, the Remote Commander can be used to review
the failure occurrence data stored in memory to reveal past problems and how often these problems occur.
Diagnostic Test Indicators
When an error occurs, the STANDBY/TIMER LED will flash a set number of times to indicate the possible cause of the problem. If there is more than
one error, the LED will identify the first of the problem areas.
Results for all of the following diagnostic items are displayed on screen. If the screen displays a “0”, an error has occurred.
Diagnostic Item
No. of times
STANDBY /
TIMER lamp
flashes
Display
Result Probable Cause Location Detected Symptoms
Power does not turn on Does not light _______ •Power cord is not plugged in.
•Fuse is burned out (F501). (AY Board) •Power does not come on. •No power is supplied to the TV.
•AC Power supply is faulty.
+B Overcurrent (OCP)* 2 times 2:0 or 2:1 •H.OUT (Q5030) is shorted. (D Board)
•+B PWM (Q5003) is shorted.
(D Board)
•Power does not come on.
•Load on power line shorted.
Low +B Overvoltage (OVP) 3 times 3:0 or 3:1 •IC6505 is faulty. (D Board) •Has entered standby mode.
Vertical Deflection Stopped 4 times 4:0 or 4:1 •15V is not supplied. (D Board)
•IC5004 is faulty. (D Board) •Has entered standby mode after
Horizontal raster.
•Vertical deflection pulse is stopped.
•Power line is shorted or power
supply is stopped.
White Balance Failure
(not balanced) 5 times 5:0 or 5:1 •Video OUT (IC9001-IC9003) is faulty.
(CH, Board)
•CRT drive (IC2801) is faulty.
(B Board.)
•G2 is improperly adjusted.**
•No raster is generated.
•CRT cathode current detection
reference pulse output is small.
LOW +B OCP/OVP
(overcurrent/overvoltage)*** 6 times 6:0 or 6:1 •+5 line is overloaded. (A, B, M Boards)
•+5 line is shorted. ((A, B, M Boards)
•IC504 is faulty. (A Board)
•No picture
Horizontal Deflection
Stopped 7 times 7:0 or 7:1 •No picture
* If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously. The symptom that is diagnosed first by the
microcontroller is displayed on the screen.
** Refer to Screen (G2) in Section 2-5 of this manual.
*** If STANDBY/STEREO LED flashes six (6) times, unplug the unit and wait 10 seconds before performing the adjustment.
Self Diagnosis
Supported model
Standby/Timer LED
* One flash count is not used for
self-diagnostic.

9
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
Self-Diagnostic Screen Display
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is possible to bring up past
occurrences of failure on the screen for confirmation.
To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:
DISPLAY Channel 5Sound volume -Power ON.
SELF DIAGNOSIS
2: +B OCP 0
3: +B OVP 0
4: VSTOP 0
5: AKB 1
6: LOWB 0
7: H-STOP 0
101: WDT 24
Handling of Self-Diagnostic Screen Display
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during repairs. When you
have completed the repairs, clear the result display to “0”.
Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after completion of the repairs.
Clearing the Result Display
To clear the result display to “0”, press buttons on the Remote Commander sequentially when the diagnostic screen is displayed, as shown below:
NOTE: This will also reset all user functions (including auto programming and picture settings)
ENTERChannel 8
Quitting the Self-Diagnostic Screen
To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.
Self-Diagnostic Circuit
1
2
4
3
3
1
2
R5104 R5105
R5125
Q5018
RY6501
Q6527
Q6530
Q6532
D6537
D6505
D5007
PH6501
Q5004
R5013
D5005
IC6505 Q6522
1K-PROT2
+B OVP
HV PROT
UNREG 11V
5V UNREG 7V
+B OCP
21
34
IC5007
VDY-
CRT
IC2801
Y/C JUNGLE
SCL
SDA
AKB
VPROT
HPROT
IC2300
MAIN MICRO
B
CLKO
DATO
AC RLY
LOW B ERR
OVP
OCP
STR
STBY-LED
STBY-LED
P_SW(-)
IC504
5V
+B
+B +B
D
B
M
D
D
A
2 14
34
35
58
26
25
29
30
69
43
44
45
48
O
IO
FOLLOWER
H. PROT
MONITOR
IN RUSH
OVER CURRENT
+ B COP
DETECT
+B OVP
INVERT
LATCH
LATCH
ENABLE ON
SV REF
Numeral “0”
means that no fault was detected.
Numeral “1”
means a fault was detected one
time only.

10
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
+B overcurrent (OCP)
Occurs when excessive current flows through R5013. The increase in voltage across R5013 causes the output of Q5004 to go high, and this high
signal goes to the micro.
+B overvoltage (OVP)
IC6505 detects +B OVP condition and turns on Q6522. This sends a high signal to the micro and also shuts down the AC relay.
V-STOP
Occurs when an absence of the vertical deflection pulse is detected by pin 24 of IC2801 (B Board). Power supply will shut down when waveform
interval exceeds 2 seconds.
White Balance Failure
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC2801. TV will stay on, but there will be
no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects IK).
Low B OCP/OVP
Occurs when set 5V is out.
Horizontal Deflection Stopped
Occurs when either:
1) a +B overcurrent is detected (IC5007), or
2) overheating is detected (Thermistor TH5002).

11
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
1-1. REAR COVER REMOVAL
SECTION 1: DISASSEMBLY
CAUTION! - Heat sink on IC5004 is -15V. Do not to allow
heat sink to touch GND or any other components.
Heat sink on Q8018 VpK=250V. Do not touch or short to
GND or other components.
CAUTION! - Pay attention to Neck Assembly WY Board wire
harness to B Board. The WY Board can easily break if there
is sudden or excessive tension on the harness.
1Lift lever up on the right and left sides of the chassis bracket
and gently pull the chassis assembly away from the bezel.
2Pull up and rotate both the A and D Boards in order to
service the unit.
1Lift lever up on the right and left sides of the chassis
bracket and gently pull the chassis assembly away from
the bezel.
Rear Cover
5 Screws
+BVTP 4 x 16
TYPE2 TT (B)
1-2. CHASSIS ASSEMBLY REMOVAL 1-3. SERVICE POSITION
5 Screws
+BVTP 4 x 16
TYPE2 TT (B)
4 Screws
+BVTP 4 x 16
TYPE2 TT (B)

12
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
1. Discharge the anode of the CRT and remove the
anode cap.
2. Unplug all interconnecting leads from the deflection
yoke, neck assembly, degaussing coils and CRT
grounding strap.
3. Remove the CH Board from the CRT.
4. Remove the chassis assembly.
5. Loosen the neck assembly fixing screw and remove.
6. Loosen the deflection yoke fixing screw and remove.
7. Place the set with the CRT face down on a cushion
and remove the degaussing coil holders.
8. Remove the degaussing coils.
9. Remove the CRT grounding strap and spring
tension devices.
10.Unscrew the four CRT fixing screws [located on
each CRT corner] and remove the CRT
[Take care not to handle the CRT by the neck].
1-4. PICTURE TUBE REMOVAL
WARNING: BEFORE REMOVING THE ANODE CAP
High voltage remains in the CRT even after the power is disconnected. To avoid electric shock,
discharge CRT before attempting to remove the anode cap. Short between anode and CRT
coated earth ground strap.
ANODE CAP REMOVAL PROCEDURE
WARNING: High voltage remains in the CRT even after the power is disconnected. To avoid electric shock, discharge CRT before attempting to
remove the anode cap. After removing the anode cap, short circuit to either the metal chassis, CRT shield, or carbon painted on the CRT.
NOTE: After removing the anode cap, short circuit the anode of the picture tube and the anode cap to either the metal chassis, CRT shield or carbon
painted on the CRT.
REMOVAL PROCEDURES
a
b
Anode Button
c
Turn up one side of the rubber cap in
the direction indicated by arrow a .
Use your thumb to pull the rubber
cap firmly in the direction indicated
by arrow b .
When one side of the rubber cap separates from
the anode button, the anode cap can be removed
by turning the rubber cap and pulling it in the
direction of arrow c .
HOW TO HANDLE AN ANODE CAP
1. Do not use sharp objects which may cause damage to the surface of the anode
cap.
2. To avoid damaging the anode cap, do not squeeze the rubber covering too
hard. A material fitting called a shatter-hook terminal is built into the rubber.
3. Do not force turn the foot of the rubber cover. This may cause the shatter-hook
terminal to protrude and damage the rubber.
Coated
Earth
Ground
Strap
4
3
4
6
5
2
9
3
8
10
7
1

13
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
CABLE WIRE DRESSING
NOTE: IF THE WIRE DRESSING IS NOT DONE PROPERLY, IT MAY CAUSE DISTORTION
G2 & FOCUS LEAD WIRE DRESSING
Dress
wires in
Clamp on
U-Bracket
CN9003
ECG
[CH]
or
[CX]
CLP9002
CN9109
G2
REV-1
3/11/05
CN9004
ECG
CLP9003
FOCUS
LEAD
BEFORE Installing CH-Board to CRT Neck
PUSH down G2 Lead AND Focus Lead. The wires
must NOT touch B-side of WY-Board!
Push Wire Down
HERE
SIDE VIEW
[WY]
CRT SOCKET
B-Side
Push Wire Down
HERE.
Dress wires so
they do NOT
touch B-Side of
WX-Board!
!
FOCUS Lead
G2 Lead
[CH]
or
[CX]

14
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
G2 WIRE ROUTING CAUTION POINT
U-Bracket
O.K. CONDITION
SIDE VIEW
FBT U-Bracket
Wire Holder
p/n: 4-065-850-11
N.G CONDITION
SIDE VIEW
FBT U-Bracket
G2 WIRE
1-900-808-42
FBT
!
REAR VIEW
Dress wire in
“L” Shape.
N.G!
Wire can touch
Rear Cover!!
G2 Wire MUST be routed correctly
so that the wire does NOT touch
Rear Cover (Causes “Buzzing” sound)
Route wire in front of U-Bracket!
REV-1
3/11/05
Wire Holder
p/n: 4-065-850-11

15
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/32HS420 ECG WIRE DRESSING
DY
Rotation
COIL
g
Rev. 1
3/11/05
CRT BRKT
Earth Coating
Ground Wire (ECG)
32”: 1-900-808-29
(Earth Coating Ground)
Integral Spring
2-Places
NOTE: Leads are
dressed inside
Rotation Coil.
NOTE2: There are
2 Leads (TOTAL 4
Wires) to connect
to CH-Board
Caution Points:
1. Make sure braided ECG wire loop does not
twist, and stays flat on CRT surface.
2. Do not pull excessively on the tension spring
3. If the spring appears warped or stretched,
replace entire parts. The braided ECG wire
CANNOT sag on the CRT, and must remain
under tension.

16
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-30HS420/34HS420 ECG WIRE DRESSING
DY
Rotation
COIL
Rev. 1
3/11/05
CRT BRKT
NOTE: Leads are
dressed inside
Rotation Coil.
NOTE2: There are
2 Leads (TOTAL 4
Wires) to connect
to CX-Board
ECG - P/N
1-900-808-30 - 30 WCRT
1-900-808-31 - 34W CRT
SPRING (2 places)
Integral part of
the Ground wire
2-022-978-01
Wire Clip (2 Places)

17
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
ECG ASSEMBLY CAUTION POINTS
Rev. 1
3/11/05
Caution:
Clip spring on
the OUTSIDE
of the CRT
pierce.
!!
FRONT FRONT
Earth Coating Groung
[ECG]
SPEAKER SPEAKER
Make sure braided
wire does not twist or
sag on CRT surface.
Caution:
Clip spring on
the OUTSIDE
of the CRT
pierce.
CRT Frit-Line CRT Frit-Line
Make sure braided
wire does not twist or
sag on CRT surface.

18
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/32HS420 CRT WIRE DRESSING
DY
Rotation
COIL
Cable Tie
4-041-041-02
Rev. 1
3/11/05
DGC Clip (p/n: 4-102-284-01)
CRT BRKT
1-900-804-64
DGC Restraint Cable
(w/ x4 loops around DGC)
To FBT
1-900-804-64
DGC Restraint Cable
(w/ x4 loops around DGC)
DGC
Cable Tie
4-041-041-02
Cable Holder
4-084-918-01
x2

19
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/32HS420 DCG WIRE DRESSING
DY
Rotation
COIL
Rev. 2
3/11/05
CRT BRKT
DGC CLIPS (29RSN)
p/n: 4-062-970-12
DGC Restraining Cable
1-900-804-27
clipped to inside hooks
on CRT Plate.
DGC Restraining Cable
Wrapped around DGC THREE times
(upper and lower)
Cable Tie
4-041-041-02
Cable Tie
4-041-041-02
DGC Restraining Cable
1-900-804-27
clipped to inside hooks
on CRT plate.

20
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-27HS420/29DRC430/30HS420/32HS420/34HS420
KV-30HS420/34HS420 DGC ASSEMBLY CAUTION POINTS
DGC
DY
Rev. 1
3/11/05
CRT BRACKET
1-910-000-13
DGC Restraint Cable
1-900-803-55
DGC Restraint Cable
!
Wrap x4 LOOP (for 30W)
Wrap x2 LOOP (for 34W)
NO SLACK ON WIRE!
!
Caution:
Make sure
hook is
secure on CR
T
pierce!
Caution:
Make sure
hook is
secure on CR
T
pierce!
!
!
Wrap x4 LOOP (for 30W)
Wrap x2 LOOP (for 34W)
NO SLACK ON WIRE!
Caution:
Make sure Cable
Tie is TIGHTENED
once CRT is in
Vertical postion.
Caution:
Make sure Cable
Tie is TIGHTENED
once CRT is in
Vertical postion.
2-022-978-01
Wire Clip (2 Places)