Table of Contents
Advertisement
Self Diagnostic
Self-Diagnostic is new in the series BA-4 TV chassis. It uses a blinking
light or OSD to notify you if there is a failure caused by the following:
1. Excessive flyback current or amplitude;
2. No Vertical sweep; or
3. No green automatic white balancing signal.
Timer / Standby Light
The number of times the Timer/Standby light blinks indicates what failure
is detected by the Control Tuning System Microprocessor IC001. IC001
will shut off or blank the TV set to protect itself. The Standby/Timer light
will continue to blink as long as the TV is plugged into AC power.
Standby / Timer Light Diagnosis
Standby Light Blinks
Symptom
2 times, pauses and
Shutdown.
repeats.
TV powers OFF.
4 times, pauses and
Set Turns OFF.
repeats.
5 times, pauses and
1. Raster, but no
repeats.
video
2. Sound OK.
Continues to blink
No or defective
once a second.
Jungle IC301
communications.
The number of times the TV has failed is held in memory. As long as
there is failure information present, the standby light will blink when the
set is tuned OFF. Unplugging the TV set will clear the memory informa-
tion and stop the blinking.
Problem
1. Excessive B+ current
demand or high FBT pulse
amplitudes.
2. No reply from Jungle
IC301.
Vertical Failure (may also be
Horizontal Failure since the
vertical IC is powered by the
FBT.)
White balance failure, weak
picture tube or Low G2 voltage.
No reply from an IC (data bus
is busy, grounded or held
HIGH).
99
Self-Diagnostic On Screen Display
A dormant intermittent problem is difficult to detect. The BA-4 chassis
Control Tuning System IC001 has a program to record the number of
times the TV has failed in the first three categories listed above. This
information can be accessed and displayed on the TV screen as long as
the set remains plugged in.
Self-Diagnostic Access
With the set OFF, aim the remote at the TV and press the following re-
mote buttons in this sequence:
1. Display
2. 5
3. Volume Down -
4. Power On
The TV will power ON and display the self-diagnostic page. This self-
diagnostic display will overlay the TV or video picture.
At the left of the self-diagnostic TV screen display are the numbers 2, 4
and 5. These represent the number of times the Timer/Standby light was
blinking. The numbers 3 and 101 are not used (N/A).
The column on the right side shows the number of failures that have
occurred since the program was reset. Up to 99 failures can be recorded.
Although the self-diagnostic page will display the number of times a fail-
ure has occurred, it will not be able to tell you exactly where the problem
is, only that it exists.
Advertisement
Table of Contents
