KV-21FT250
KV-21FT250
7
Detected Symptoms
SELF-DIAGNOSTIC FUNCTION
*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.
LED OFF
3 sec.
Standby indicator
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.
Self Diagnosis
Supported model
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”.
Power does not turn on
+B overcurrent (OCP)*
V-Protect (OVP)
IK (AKB)
Does not light
2 times *
4 times
5 times
2:0
or
2:1 - 255
4:0
or
4:1 - 255
5:0
or
5:1 - 255
• Power cord is not plugged in.
• Fuse is burned out (F600). (A Board)
• H.OUT (Q805) is shorted. (A Board)
• IC751 is shorted. (C Board)
• +13V is not supplied. (A Board)
• IC804 is faulty. (A Board)
• Video OUT (IC1545) is faulty(A Board)
• IC001 is faulty. (A Board)
• Screen (G2) is improperly adjusted.**
No. of Times
STANDBY LED
Indicator Flashes
Diagnostic Item
Description
Self-Diagnositc
Display/
Diagnostic Result
Probable Cause Location
• 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.
Power Supply
NG (+5V) for
Video Processor
8 times
8:0
or
8:1 - 255
• IC604 is faulty.
• IC602 is faulty.
• No power supply to CRT Anode.
• No RASTER is generated.
