Sony KD-34XBR2 Service Manual ▷ View online
— 6 —
KD-34XBR2
To Exposed Metal
Parts on Set
Parts on Set
0.15 µF
Earth Ground
AC
Voltmeter
(0.75V)
Voltmeter
(0.75V)
1.5 k
Ω
Trouble Light
AC Outlet Box
Ohmmeter
Cold Water Pipe
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
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.
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.
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.
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.
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 speciÞ ed values. Make sure
your instruments are accurate; be suspicious of your HV meter if sets
always have low HV.
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.
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.
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.
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).
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.
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).
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).
Figure A. Using an AC voltmeter to check AC leakage.
Figure B. Checking for earth ground.
— 7 —
KD-34XBR2
SELF-DIAGNOSTIC FUNCTION
Display of STANDBY/i.LINK Standby LED Flash Count
Diagnostic items
Flash count
Lamp OFF 3 sec.
Lamp ON 0.3 sec.
Lamp OFF 0.3 sec.
Standby/i.LINK Standby LED
+B overcurrent
2 times
+B/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/i.LINK STANDBY LED Flash
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/i.LINK STANDBY LAMP from fl ashing.
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/i.LINK 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.
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.
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/i.LINK STANDBY LED 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 STANDBY/i.LINK STANDBY LED 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.
number of times the LED fl ashes translates to a probable source of the problem. A defi nition of the STANDBY/i.LINK STANDBY LED 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 STANDBY/i.LINK STANDBY LED 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.
When an error occurs, the STANDBY/i.LINK STANDBY LED 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”.
No.
of
times
STANDBY/
Diagnostic Item
i.LINK STANDBY lamp fl ashes
Display Result
Probable Cause Location
Detected Symptoms
Power does not turn on
Does not light
• Power cord is not plugged in.
• Power does not come on.
• Fuse is burned out (F6701).
• 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).
• Power does not come on.
(see Note 1)
• +B PWM (Q5003) is shorted (D Board).
• Load on power line is shorted.
• IC9001, IC9002, IC9003 is shorted (C Board).
Low +B overvoltage (OVP)
3 times
3:0 or 3:1
• IC6505 is faulty (D Board). +B overvoltage.
• Has entered standby mode.
Vertical Defl ection Stopped
4 times
4:0 or 4:1
• ± 15V is not supplied (D Board).
• Has entered standby state after
• IC5004 is faulty (D Board).
Horizontal raster.
• Vertical defl ection pulse is stopped.
• Power line is shorted or power
supply
is
stopped.
White Balance Failure
5 times
5:0 or 5:1
• Video OUT (IC9001-IC9003) is faulty
• No raster is generated.
(Not balanced)
(C Board).
• CRT cathode current detection
• CRT drive (IC3101) is faulty (A Board).
reference pulse output is small.
• G2 is improperly adjusted (See Note 2).
LOW +B OCP/OVP
6 times
6:0 or 6:1
• +5 line is overloaded (A, B Boards).
• No picture.
(overcurrent/overvoltage)
• +5 line is shorted (A, B Boards).
(See Note 3)
Horizontal Defl ection Stopped
7 times
7:0 or 7:1
• No picture.
Note 1: If a +B overcurrent is detected, stoppage of the Vertical defl ection is detected simultaneously. The symptom that is diagnosed fi rst by the microcontroller is displayed on screen.
Note 2: Refer to Screen (G2) Adjustment in Section 2-5. of this manual.
Note 3: If STANDBY/i.LINK STANDBY LED fl ashes six (6) times, unplug the unit and wait 10 seconds before performing the adjustment
Note 2: Refer to Screen (G2) Adjustment in Section 2-5. of this manual.
Note 3: If STANDBY/i.LINK STANDBY LED fl ashes six (6) times, unplug the unit and wait 10 seconds before performing the adjustment
Self Diagnosis
Supported model
* One fl ash count is not used for self-
diagnostic.
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KD-34XBR2
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.
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:
To clear the result display to “0”, press buttons on the Remote Commander sequentially when the diagnostic screen is displayed, as shown below:
ENTER
Channel 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.
To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.
Self-Diagnostic Circuit
+B overcurrent (OCP)
Occurs when an overcurrent (more
than 6A) on the +B (135V) line
is detected by R6598/R6591. It will
cause Q6520 to turn on and force the
AC relay to turn off through Q6532
and Q6530.
Occurs when an overcurrent (more
than 6A) on the +B (135V) line
is detected by R6598/R6591. It will
cause Q6520 to turn on and force the
AC relay to turn off through Q6532
and Q6530.
+B overvoltage (OVP)
Occurs when 1) overvoltage (more
than +140V) on the +B (135V) line
is detected by IC6505, or 2) an
overvoltage (more than 7.5 V) on the
unreg 7V line is detected by D6014.
The AC relay will turn off through
Q6532 and Q6530.
Occurs when 1) overvoltage (more
than +140V) on the +B (135V) line
is detected by IC6505, or 2) an
overvoltage (more than 7.5 V) on the
unreg 7V line is detected by D6014.
The AC relay will turn off through
Q6532 and Q6530.
Vertical Defl ection Stopped
Occurs when an absence of the
Vertical defl ection pulse is detected by
IC201. Power supply will shut down
when waveform interval exceeds 2
seconds.
Occurs when an absence of the
Vertical defl ection pulse is detected by
IC201. 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 IC201. TV will stay on, but there
will be no picture.
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC201. TV will stay on, but there
will be no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).
Low B OCP/OVP
Occurs when set 5V is out.
Occurs when set 5V is out.
Horizontal Defl ection Stopped
Occurs when either: 1) a +B overcurrent is detected (IC5007), or 2) overheating is detected (Thermistor TH5002).
Occurs when either: 1) a +B overcurrent is detected (IC5007), or 2) overheating is detected (Thermistor TH5002).
To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander
sequentially, in rapid succession, as shown below:
In standby mode, press buttons on the Remote Commander
sequentially, in rapid succession, as shown below:
DISPLAY
Channel 5
Sound volume -
Power ON.
Numeral “0” means that no fault
was detected.
was detected.
Numeral “1” means a fault was
detected one time only.
detected one time only.
SELF DIAGNOSIS
2: +B OCP
2: +B OCP
N/A
3: +B OVP
N/A
4: VSTOP
0
5: AKB
1
6: LOWB
0
7: H-STOP
0
.
.
— 9 —
KD-34XBR2
1-1. REAR COVER REMOVAL
1-2. CHASSIS ASSEMBLY REMOVAL
SECTION 1: DISASSEMBLY
1
2
1
CAUTION! - Heat sink on IC5004 is -15V.
Care must be taken not to allow heat sink to
touch any other components.
touch any other components.
2
Lift lever up on the right and left sides of the
chassis bracket and gently pull the chassis
assembly away from the beznet.
assembly away from the beznet.
1
1
1
1
2
1
Remove screws (15) from locations as marked.
2
Gently slide the rear cover back and up to remove.
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