Self-Diagnostic Function - Sony TRINITRON KV-21FW150 Service Manual

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY LED indicator 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 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.
1. Diagnostic Test Indicators
When an error occurs, the STANDBY LED indicator will fl ash a set number of times to indicate the possible cause of the problem. If there is more than
one error, the indicator 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
Diagnostic Item
STANDBY LED
Description
Indicator Flashes
Power does not turn on Does not light
+B overcurrent (OCP)*
2 times *
4 times
V-Protect (OVP)
5 times
IK (AKB)
8 times
Power Supply
NG (+5V) for
Video Processor
*One fl ash count is not used for self-diagnostic.
*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.
**Refer to Screen (G2) Adjustments in Section 2-4. of this manual.
2. Display of STANDBY LED Flash Count
2 times
4 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
3. Stopping the STANDBY LED Indicator Flash
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY LED Indicator from fl ashing.
4. 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.
KV-21FW150

SELF-DIAGNOSTIC FUNCTION

Self-Diagnositc
Display/
Probable Cause Location
Diagnostic Result
• Power cord is not plugged in.
• Fuse is burned out (F600). (A Board)
2:0
• H.OUT (Q805) is shorted. (A Board)
or
• IC751 is shorted. (C Board)
2:1 - 255
4:0 • +13V is not supplied. (A Board)
• IC804 is faulty. (A Board)
or
4:1 - 255
• Video OUT (IC1545) is faulty(A Board)
5:0
• IC001 is faulty. (A Board)
or
• Screen (G2) is improperly adjusted.**
5:1 - 255
8:0
• IC604 is faulty.
or
• IC602 is faulty.
8:1 - 255
LED OFF
3 sec.
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 is shorted.
• Has entered standby state after horizontal raster.
• Vertical defl ection 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.
• No power supply to CRT Anode.
• No RASTER is generated.
Standby indicator
KV-21FW150
7