Read Sony KV-21FS105 (serv.man2) Service Manual online
8
KV-21FS105
KV-21FS105
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.
SELF
DIAGNOSIS
2:
0
3: NA
0
4:
0
Numeral “0” means that no fault was detected.
5: NA
1
Numeral “1” means a fault was detected one time only.
101:
WDT
0
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
MB BOARD
IC1301
Y/CHROMA JUNGLE
A BOARD
IC507
V. OUT
MB BOARD
IC1001
SYSTEM
MB BOARD
IC1003
MEMORY
IK IN
FROM
CRT
21
HP/PROTECT
SDA
A BOARD
FROM
IC502
PIN 7
18
35
IO-SDAT
O-LED
37
REF 3
I-PROT
IO-BDAT
17
36
B-DAT
5
18
DISPLAY
+B overcurrent (OCP)
Occurs when an overcurrent on the +B (135V) line is detected by pin 18 of IC1301 (MB Board). If the voltage of pin 18 of IC1301 (MB Board) is less than
1V when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.
Occurs when an overcurrent on the +B (135V) line is detected by pin 18 of IC1301 (MB Board). If the voltage of pin 18 of IC1301 (MB Board) is less than
1V when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.
Vertical Deflection Stopped
Occurs when an absence of the vertical defl ection pulse is detected by pin 17 of IC1001 (MB Board). Power supply will shut down when waveform interval
exceeds 2 seconds.
Occurs when an absence of the vertical defl ection pulse is detected by pin 17 of IC1001 (MB 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 IC1301 (MB Board). 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 IC1301 (MB Board). TV will stay on, but
there will be no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).
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