SONY KV-21FS120 - KV-24FS120 - LED BLINKING CODES - DISASSEMBLY
APPLICABLE TO: SONY
KV-20FS120 RM-Y194 US SCC-
S61K-A,
KV-20FS120 RM-Y194 CND SCC-
S59H-A,
KV-21FM120 RM-W151 LATIN
NORTH SCC- S60X-A,
KV-21FS120 RM-Y194 LATIN
NORTH SCC- S60Y-A,
KV-21FS120 RM-Y194 LATIN
SOUTH SCC- S73A-A
KV-21FA310 RM-Y180 LATIN
NORTH SCC- S60T-A,
KV-21FA310 RM-Y180 LATIN
SOUTH SCC- S60U-A,
KV-24FS120 RM-Y194 US SCC-
S61L-A,
KV-24FS120 RM-Y194 CND SCC-
S59J-A,
KV-25FS120 RM-Y194 LATIN
NORTH SCC- S73B-A
KV-25FS120 RM-Y194 LATIN SOUTH SCC- S73C-A.
- When an error occurs, the STANDBY/TIMER 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 first 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”.
- If a +B over current is detected, stoppage of the vertical deflection is detected simultaneously. The symptom that is diagnosed first by the micro controller is displayed on the screen.
+B
Overcurrent à 2 times
I-Prot à 4 times
IK
(AKB) à 5 times.
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]
à [CHANNEL-5] à [SOUND
VOLUME (-Ve)] à [POWER ON].
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:
[Channel
8] à ENTER]
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.
+B over
current (OCP)
Occurs
when an over current on the +B (135V) line is detected by pin 72 of IC001 (A
Board). If the voltage of pin 72 of IC001 (A Board) is less than 1V when V.SYNC
is more than seven verticals in a period, the unit will automatically turn off.
I-Prot
Occurs
when an absence of the vertical defl ection pulse is detected by pin 78 of
IC001 (A Board). Power supply will shut down when waveform interval exceeds 2
seconds.
IK
(AKB)
If
the RGB levels* do not balance within 2 seconds after the power is turned on,
this error will be detected by IC001 (A Board). TV will stay on, but there will
be no picture.
LED BLINKING CODES [DETAILS]
Diagnostic Item
Description
|
No. of times
STANDBY/ TIMER
lamp flashes
|
Self-Diagnostic
Display/Diagnostic Result
|
Probable Cause Location
|
Detected Symptoms
|
Power
does not turn on
|
Does
not light
|
----------
|
• Power
cord is not plugged in.
• Fuse
is burned out (F601). (A Board)
|
• Power
does not come on.
• No
power is supplied to the TV.
• AC
Power supply is faulty.
|
+B over
current (OCP)
|
2 times
|
2:0 or
2:1
|
• H.OUT
(Q506) is shorted. (A Board) (20”/21” models only)
H.OUT
(Q505) is shorted. (A Board) (24”/25” models only)
• RGB
Amp (IC1751) is shorted. (CV Board)
|
• Power
does not come on.
• Load
on power line is shorted.
|
I-Prot
|
4 times
|
4:0 or
4:1
|
• +13V
is not supplied. (A Board)
• IC545
is faulty. (A Board)
|
• Has
entered standby state after horizontal raster.
•
Vertical defl ection pulse is stopped.
• Power
line is shorted or power supply is stopped.
|
IK
(AKB)
|
5 times
|
5:0 or
5:1
|
• Video
OUT (IC545) is faulty.
(A
Board)
• IC001
is faulty. (A Board)
•
Screen (G2) is improperly adjusted
|
• No
raster is generated.
• CRT
Cathode current detection reference pulse
output
is small.
|
DISASSEMBLEY
REAR COVER REMOVAL (ALL EXCEPT KV-21FA310)
Remove screws.
REAR COVER REMOVAL (KV-21FA310 ONLY)
Lift to
remove Sub-woofer.
Remove
screws.
CHASSIS REMOVAL
SERVICE
POSITION
- Push down on clips to release K Board, then unplug the 2 pin woofer connector and move out of the way.
- Press on catch tab to release A Board.
- Disconnect remaining cables to allow A Board to be removed.
