H3, H1, H2, and T Block Diagrams ............................... 100
U Block Diagram ........................................................... 101
KF-42WE620/50WE620
3
SPECIFICATIONS
p
)
r
KF-42WE620/50WE620
Power Requirements
Power Consumption (W)
In Use (Max)
In Standby
Inputs/Outputs
120V AC, 60Hz
210W
Under 1 W
DVI-HDTV
1 terminal, 3.3V T.M.D.S., 50 ohms
The DVI-HDTV input terminal is compliant with the EIA-861
standard and is not intended for use with personal computers.
0.87 inch TFT LCD panel Approx. 3.28 million dots (1,092,168
pixels)
Projection Lens
High Performance, large diameter hybrid lens F2.4
1/4
x 14
5W x 2
20W
1/2
in54
Supplied Accessories
Optional Accessories
1/4
x 36
Remote Commander RM-Y916
Two Size AA (R6) Batteries
Cleaning Cloth
TV Stand
SU-GW2 (KF-42WE620 Only)
SU-GW1 (KF-50WE620 Only)
Lamp
XL-2100U
Control S Cable
RK-G69
Component Video Cable
VMC-10/30
AV Receiver
STR series or equivalent
1/2
x 17
3/4
in
KF-42WE620/50WE620
Lamp
UHP lamp, 100W
XL-2100U
Design and specifi cations are subject to change without notice.
4
KF-42WE620/50WE620
WARNINGS AND CAUTIONS
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 identifi ed 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 identifi ed in this manual. Follow these procedures
whenever critical components are replaced or improper operation is suspected.
ATTENTION!!
Afi n 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 identifi es 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 identifi es dans le present manuel. Suivre ces procedures lors de chaque
remplacement de composants critiques, ou lorsqu’un mauvais fonctionnement suspecte.
KF-42WE620/50WE620
5
SAFETY CHECK-OUT
KF-42WE620/50WE620
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 specifi ed 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
0.15 F
Figure A. Using an AC voltmeter to check AC leakage.Figure B. Checking for earth ground.
KF-42WE620/50WE620
Earth Ground
AC
Voltmeter
(0.75V)
Trouble Light
AC Outlet Box
Ohmmeter
Cold-water Pipe
6
KF-42WE620/50WE620
SELF-DIAGNOSTIC FUNCTION
Self Diagnosis
Supported model
The units in this manual contain a self-diagnostic function. If an error occurs, the POWER/STANDBY will automatically begin to fl ash. The number of
times the LED fl ashes translates to a probable source of the problem. A defi nition of the POWER/STANDBY fl ash 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 POWER/STANDBY will fl ash 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 fi rst of the problem areas.
Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.
Diagnostic Item
Description
Power does not turn on 0
Lamp cover error 3 times
Fan stopped 4 times
Temp error 4 times
Lamp driver error 5 times
+B OVP error 6 times
Audio error 7 times
D-OVP error 8 times
Lamp error LAMP-LED flashes
No. of times
POWER/STANDBY
lamp flashes
Probable Cause Location Detected Symptoms
• Power cord is not plugged in.
• Fuse is burned out.
(F1901 on F Board)
• Lamp cover is not attached
securely.
• Fan1, Fan2, or Fan 3 power
is not supplied. .
(A Board)
• Fan connector is not attached
securely
• Temperature is high.
• IIC-E line connector
(CN8023 on A Board,
CN44 on H Board) is not
attached securely.
• Lamp driver is faulty. • No picture/No sound
• +17V is not supplied.
(G1 Board)
• Audio line is shorted.
(A, G1 Board)
• IC8504 (A Board) or IC4704
(AU Board) is faulty.
• PS1601 or 1602 is opened.
(G1 Board)
• +3.3V or +2.5V or 1.8V is
over voltage.
(G3 Board)
• Lamp for the light source has
burnt out.
• Power does not come
on.
• No power is supplied
to the unit.
• AC power supply is
faulty.
• No picture/No sound
• No picture/No sound
• No picture/No sound
• No picture/No sound
• No picture/No sound
• No picture/No sound
• No picture/No sound
KF-42WE620/50WE620
7
KF-42WE620/50WE620
m
k
N
*If a +B overcurrent is detected, stoppage of the vertical defl ection is detected simultaneously. The symptom that is diagnosed fi rst by the
mircrocontroller is displayed on the screen.
Display of POWER/STANDBY Flash Count
- One blink is not used for self-diagnosis.
-Example
Diagnosis ite
LED blinks
Lamp cover3 times
Fan4 times
LED ON : 0.3sec
LED OFF : 0.3sec
LED OFF
3.0sec
Stopping the POWER/STANDBY LED Flash
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the POWER/STANDBY lamp from fl ashing.
Self-Diagnostic Screen Display
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confi rmed, it is possible to bring up past
occurrences of failure on the screen for confi rmation.
To Bring Up Screen Test
In standby mode, press the buttons on the Remote Commander sequentially, in rapid succession, as shown below:
- Numeral "1" means a fault was detected one time or more.
- Numeral "0" means that no fault was detected.
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.
KF-42WE620/50WE620
8
KF-42WE620/50WE620
Clearing the Result Display
To clear the result display to “0”, press the buttons on the Remote Commander sequentially when the diagnostic screen is displayed, as shown below:
1. Power off (Set to Standby model)
Display
2.
3. Channel
8
Channel
ENTER
5
Sound Volume
Power ON
4. Wait until the initial setup display appears.
5. Disconnect the AC plug and then reconnect it.
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
Self-Diagnosis Function Operation
- 3 : Lamp cover If the lamp cover SW is opened then pin 1 of CN8034 on the A board is high. The LCD Engine u-com (pin 27 of
IC3208 on the C2 board) detects it and turns the lamp off.
- 4 : Fan If Fan1, Fan2, Fan3, or Fan4 stops then pin 2, 5, 8 or 11 of CN8035 on the A board is high. The LCD Engine
u-com (pin 24 of IC3208 on the C2 board) detects it and turns the lamp off.
- 4 : Temp If a temperature sensor on the H4 board detects a high temperature,
or the IIC-E line connector (CN8041:A board,CN3951 H4 board) is not attached securely, the LCD Engine ucom IIC-E Line detects it and turns the lamp off.
- 5 : Lamp drive If a lamp is not turned on, then pin 29 of LCD Engine u-com (IC3208 on the C2 board) is high and checks pin
28 of LCD Engine u-com. If pin 28 is low, it is judged no high voltage.
- 6 : +BOVP If +17V line drops then pin 53 of MAIN u-com (IC3405 on the C2 board) is low and automatically turns off the
main power.
- 7 : Audio If DC appears by the audio amp failure at the speaker line then it is detected by MAIN u-com (pin 59 of IC3405
on the C2 board) and automatically turns off the main power.
- 8 : D-OVP If +3.3V, +2.5V, or +1.8V line over, then pin 49 of MAIN u-com (IC3405 on the C2 board) is low and
automatically turns off the main power.
- LAMP : Lamp If a lamp is not turned on, then pin 29 of LCD Engine u-com (IC3208 on the C2 board) is high and checks pin
28 of LCD Engine u-com. If pin 28 is high the lamp is burned out.
H3/A board
IC41
Temp
sensor
G3/A board
+3.3V
+2.5V
+1.8V
+17V
G1/A board
4:Temp
8:D-OVP
6:+B OVP
17V-DET
C2 board
IC3208
LCD Engine u-com
LAMP COV
IIC-E
LAMP DRV
LAMP PROT
FAN PROT
IC3405
MAIN u-com
D-OVP
49
SP-DC-PROT
53
LOW-B-ERR
27
28
29
24
59
3:Lamp
cover
5:Lamp
driver
Lamp
4:Fan
CN8022
7:Audio
A board
CN8014
3
2
1
CN8003
1
2
5
8
IC8504
Audio
amp
IC4704
Audio
HV-DET
LAMP-PRT
FAN1-PRT
FAN2-PRT
FAN3-PRT
T/A board
S3999
SW
Lamp driver
Fan1
Fan2
Fan3
Lamp
amp
KF-42WE620/50WE620
AU board
9
1-1. REAR COVER REMOVAL
2
KF-42WE620/50WE620
SECTION 1: DISASSEMBLY
Rear cover
1-2. CENTER PILLAR REMOVAL
Disconnect
three ground wires
Two small screws
(+PSW 3x8)
1
Eleven screws
(+BVTP 4x16)
Gently lift the Center Pillar up then out
5
from the bottom bracket.
Three screws from the top of the center pillar
1
(+BVTP 4x16)
4
2
Center Pillar
KF-42WE620/50WE620
Two screws
(+BVTP 4x16)
3
10
1-3. SERVICE POSITION
r
Chassis assembly
Pull back on claw, then gently pull out chassis assembly
1
KF-42WE620/50WE620
1-4. CHASSIS ASSEMBLY AND D.C. FAN REMOVAL
Four screws
3
(+PWH 4x35)
Chassis assembly
Pull back on claw,
then gently pull out chassis assembly
4
Fan bracket with D. C. fan
2
Disconnect one connecto
D. C. FAN
1
Four screws
(+PWH 4x16)
KF-42WE620/50WE620
11
1-5. POWER SUPPLY BLOCK REMOVAL (LAMP DRIVE UNIT)
CAUTION: When removing the Power Supply Block be careful not to move the Optical Unit Block
KF-42WE620/50WE620
Unhook the antenna cable
3
Pull forward to remove
5
4
Four screws (+BVTP 3x12)
1
Disconnect two connectors
1-6. UD BOARD AND RF ANTENNA SWITCH REMOVAL
Disconnect three connectors
and the ground wire
1
1
4
Disconnect two Pin plugs
and one connector
4
2
Two screws (+PWH 4x16)
(to detach the cables from the
Optics Unit Block Assembly)
Power supply block
One screw
(+BVTP 3x8)
KF-42WE620/50WE620
UD board
3
4
5
Two screws (HEX)
RF antenna switch
2
One screw
(+PSW 3x8)
12
1-7. U BOARD REMOVAL
U board
Disconnect three connectors
2
Disconnect four ground wires
1
Six Screws (+BVTP 3x12)
3
U bracket
4
Gently pull back on the two clips
on the pin connection slot
while slowly lifting the U Board
KF-42WE620/50WE620
1-8. F AND G1 BOARD REMOVAL
Note:
Place the F Board on its side
to disconnect three ground wires.
Ttwo screws (+BVTP 3x12)
F board
Disconnect the Power cord
from CN1907 connector.
4
2
Claw
1
Disconnect two connectors (CN1602 & CN1605)
and one ground wire (CN1611)
6
G1 board
Disconnect one connector
(CN1609)
8
7
9
3
Remove wires from purse locks
5
Gently pull back on the two clips
on the pin connection slot
while slowly lifting the G1 Board.
Disconnect one ground wire
KF-42WE620/50WE620
13
1-9. DIC BLOCK, AU BOARD AND C2 BOARD REMOVAL
Note:
The C2 Board is part of the C2 Block Assembly and cannot be ordered separately.
Remove the AU Board after removing the C2 Block Assembly
Note:
2
The 14P Connector Assembly (LVDs cables) have colored tape (white tape)
to indicate which connection they plug into. Please note before removing the cables.
4
Note:
The 14P Connector Assembly (LVDs cables) have colored tape (red tape-right, black tape-left)
to indicate which connection they plug into. Please note before removing the cables.
1
Disconnect one ground wire from front screen
Remove cables
from purse locks
Two screws
2
(+BVWHTP 3x12)
6
5
KF-42WE620/50WE620
Gently squeeze the gray tabs on the sides of the
14P Connector Assembly (LVDs cables) to
disconnect the two cables.
Disconnect one connector
7
Gently squeeze the gray tabs
on the sides of the
14P Connector Assembly
(LVDs cables) to disconnect
the two cables.
Three screws
(+BVWHTP 3x12)
1-10.A BOARD REMOVAL
Disconnect one connector (CN8501)
3
DIC block
AU board
8
Gently pull the AU Board
C2 board
4
Disconnect remaining nine connectors
3
Disconnect three ground wires
1
2
from the two PCB supporters
Pull back on two claws,
then gently lift out
A Board.
KF-42WE620/50WE620
4
4
A board
14
1-11. T BOARD REMOVAL
T board
2
One screw (+BVTP 3x12)
KF-42WE620/50WE620
Disconnect
one connector
1-12.FRONT COVER ASSEMBLY REMOVAL
Front cover
assembly
1
1 Two ornamental screws
Four latches
1-12-1.REPLACING THE LAMP
For detailed instructions on replacing the lamp, see
Page 15 of the Operating Instructions manual.
PN 2-108-981-11
KF-42WE620/50WE620
2
15
1-13.H3 BOARD REMOVAL (KF-42WE620 ONLY)
H3 board
1
3
H3 bracket
KF-42WE620/50WE620
Disconnect two connectors
and one ground wire
1
Spring
plate
Two screws
(+BVTP 3x12)
2
1-14.H4 BOARD REMOVAL (KF-42WE620 ONLY)
H2 block assembly
Two screws
(+BVTP 4x16)
1
Disconnect two connectors
MS panel
KF-42WE620/50WE620
4
2
3
Two screws
(+BVTP 4x16)
4
H4 board
16
1-15.H3 AND H4 BOARD REMOVAL (KF-50WE620 ONLY)
r
Note:
To remove the H4 Board you need to remove the screws inside the Bottom Cabinet Assembly
H3 board
KF-42WE620/50WE620
Spring
plate
H3 bracket
Two screws
(+BVTP 3x12)
One screw
4
MS bracket
3
1-16.H2 BOARD REMOVAL
2
1
Disconnect two connectors
and one ground wire.
Disconnect two connectors
3
H4 board
Bottom cover assembly
KF-42WE620/50WE620
Two screws
(+BVTP 3x12)
H2 board
H2 bracket
1
Four screws
(+BVTP 4x16)
3
2
Disconnect one connecto
Light guide (LED)
17
1-17.H1 BOARD REMOVAL
Disconnect one connector
Screen mirror block assembly
4
3
H1 board
One screw (3x12)
H1 button
H1 bracket
Two screws
2
(+BVTP 4x16)
1 H1 bracket cap
Using tweezers gently detach two
H1 Bracket Caps
KF-42WE620/50WE620
1-18.SCREEN MIRROR BLOCK ASSEMBLY REMOVAL
Note: For the model 50WE620, remove the screws that secure
the reinfocement plates (R)/(L).
Screen mirror block assembly
Seven screws
3
(+BVTP 4x16)
1
Disconnect three connectors
KF-42WE620/50WE620
2
Four screws
(+BVTP 4x16)
18
SECTION 2: CIRCUIT ADJUSTMENTS
KF-42WE620/50WE620
2-1. SETTING THE SERVICE ADJUSTMENT
MODE
1. Standby mode (Power off).
2. Press the following buttons on the remote commander within a
second of each other:
Display
The following screen appears:
Channel
Category Name
3D-COMB 0 0 SERVICE
NRMD TV
WSL: xxx
Item NameInput Signal
F/A FLAG: xxxxxxxx
CBA FLAG: xxxxxxxx
Category Name
L001OUT 0 0 G
OCKPN
Item Name
TEMP 42DEG
LCD PJ ENGINE VER.0.026
9/11
EE2F
5
Item No.
Sound Volumne
Data
Item No.
<LCD PROJECTOR ENGINE>
Mode
Data
Power
+
2-2. SERVICE ADJUSTMENT MODE MEMORY
1. The SCREEN displays the item being adjusted.
2. Press 1 or 4 on the Remote Commander to select the item.
3. Press
4. Press
Note: Every time you press
3
or 6 on the Remote Commander to change the data.
2
or 5 on the Remote Commander to change the category.
2
(Category Up), Service Mode changes
in the order as shown below:
VERSION0
CCPM-1
CCPM-2
CCPM-3
CCPM-4
CCPM-5
CCPM-6
CCPM-7
CCPM-8
CCPM-9
CCPM-10
CH-SET
CCPS-1
CCPS-2
CCPS-3
CCPS-5
CCPS-6
CCPS-7
CCPS-8
CCPS-10
DCP-INT
DCP-OSD
DCP-BLK
DCP-ADJ1
DCP-ADJ2
DCP-USER
DCP-AVP
USR-NR
CXA2171
AP
DLBY
MID1
MID2
MID3
MID4
MID5
MID6
MID7
MID8
MID9
SNNR
SNSS
DRCVR
CCD
D9671-1
D9671TPN
D9671CUR
D9671TG1
D9671TG2
D9671CSC
A7001R
A7001G
A7001B
SH SET
H POS SHI
TEMP
OSD-E
OPTION-E
FAN-CTL
GB RGB
KF-42WE620/50WE620
CCPS-4
AK4524
5. To go back to the most recently saved value
D9671PIC
0
then
OPTION-E
ENTER
ID
to read
the memory.
6. Press
MUTING
then
ENTER
to write into memory.
7. When you want to exit Service Mode, turn the power off.
Note: Press “8” then “[ENTER]” on the remote commander to set
the shipping conditions or turn set off and on to exit.
19
2-3. MEMORY WRITE CONFIRMATION METHOD
1. After adjustment, pull out the plug from the AC outlet, then replace the plug in the AC outlet again.
2. Turn the power switch ON and set to Service Mode.
3. Call the adjusted items again to confi rm they were adjusted.
2-4. REMOTE ADJUSTMENT BUTTONS AND INDICATORS
KF-42WE620/50WE620
MUTING
(Enter into
memory)
Adjustment
Item up
Adjustment
Category up
Adjustment
Item down
User control goes to the
standard state (Shipping
Conditions)