Self-Diagnostic Function - Sony TRINITRON KV-29FS105 Service Manual

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER 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/TIMER 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/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 fi rst 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
Power does not turn on
+B overcurrent (OCP)*
+B overvoltage (OVP)
I-Prot
IK (AKB)
Zero Cross
9V Check
* 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) adjustments in Section 2-4 of this manual
Display of Standby/Timer LED Flash Count
2 times
3 times
4 times
5 times
9 times
10 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
Diagnostic Item
+B Overcurrent
+B Overvoltage
V-STOP
IK (AKB)
Zero Cross
9V
*One fl ash count is not used for self-diagnostic.
KV-29FS105/34FS105/38FS105

SELF-DIAGNOSTIC FUNCTION

No. of times
STANDBY / TIMER
lamp flashes
• Power cord is not plugged in.
Does not light
• Fuse is burned out (F601). (GK Board)
• H.OUT (Q502) is shorted. (A Board)
2 times
• IC702 is shorted. (C Board)
• IC501 is faulty. (A Board)
3 times
• If a high is supplied to pin 2 of IC501.
(A Board)
• +12V is not supplied. (A Board)
4 times
• IC561 is faulty. (A Board)
• Video OUT (IC561) is faulty. (A Board)
5 times
• IC702 is faulty. (C Board)
• Screen (G2) is improperly adjusted. **
• No zero cross pulses on pin 45
9 times
IC1001. (A Board)
• Relay failed (RY600)
10 times
LED OFF
3 sec.
Flash Count*
2 times
3 times
4 times
5 times
9 times
10 times
Probable Cause Location
KV-29FS105/34FS105/38FS105
Self Diagnosis
Supported model
Detected Symptoms
• Power does not come on.
• No power is supplied to the TV.
• AC Power supply is faulty.
• Power does not come on.
• Load on power line shorted.
• Has entered standby mode.
• Has entered standby state after
horizontal raster.
• Vertical deflection pulse is stopped.
• Power line is shorted or power
supply is stopped.
• No raster is generated.
• CRT Cathode current detection
reference pulse output is small.
• Power does not come on.
• Power does not come on.
Standby/Timer LED
7