The units in this manual contain a self-diagnostic function.
If an error occurs, the STANDBY/TIMER lamp will automatically begin to flash.
The number of times the lamp flashes translates to a
probable source of the problem. A definition of the STANDBY/TIMER lamp flash
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 errors occurs, the STANDBY/TIMER lamp will flash a
set number of times to indicate the possible cause of the problem. If there is
more than one error, the lamp will identify the first of the problem areas.
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.
Result for all of the following diagnostic items are
displayed on screen. No error has occurred if the screen displays a “0”.
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 F4601 (F)
|
# Power does not come on.
# No power is supplied to the TV.
# AC power supply is faulty
|
|
# +B overcurrent
(OCP)
# Horizontal
deflection
overdrive
|
2 times
|
002:000 or
002:001~255
|
# H.OUT Q511 is shorted.
(A board)
|
# Power does not come on.
# Load on power line is
shorted.
# Has entered standby state
after horizontal raster.
# Power line is shorted or power
supply is stopped
|
# White balance
failure (no
PICTURE)
# Vertical deflection stopped
|
4 times
|
004:000 or
004:001~225
|
# -13V is not supplied.
(CV Board)
# IC 503 faulty (A board)
|
# Vertical deflection pulse
is stopped
|
Micro reset
|
101:00 or
101:001~225
|
# Discharge CRT
(CV Board)
# Static discharge
# External noise
|
# Power is shut down shortly, after
this return
back to normal.
#
Detect Micro latch up.
|
DISPLAY OF STANDBY/TIMER LIGHT FLASH COUNT
Diagnostic Item Flash Count
- +B overcurrent/overvoltage => 2 times
- Vertical deflection stopped => 4 times
- One flash count is not used for self-diagnostic
Turn off the power switch on the TV main unit or unplug the
power cord from the outlet to stop the STANDBY/TIMER lamp from flashing.
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 for confirmation on the screen:
To Bring Up Screen Test
- In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:
- Screen display => channel [5] => Sound volume [-] => Power ON [Note that this differs from entering the service mode (Mode Volume [+])
SELF DIAGNOSTIC SCREEN DISPLAY
Numeral "0" means that no fault has
been detected
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.
- To clear the result display to “0”, press buttons on the remote commander sequentially as shown below when the diagnostic screen is being displayed. {Channel [8] => 0 }
- To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.
- +B overcurrent [OCP] : Occurs when an overcurrent on the +B(135) line is detected by Q500. If Q604 go to ON and the voltage to pin 50 of IC301 more than 3.5V 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 deflection pulse is detected by Pin 17 and IC001 shut down the power supply.
- White balance failure: If the RGB levels do not balance or become low level within 5 seconds, this error will be detected by IC301. TV will stay on, but there will be no picture. [RGB levels of the AKB detection Ref pulse that detects IK]
