When an error occurs, the Standby/Timer LED will flash a set of number of times to indicate the possible cause of the problem. If there is more than one error, the LED will identify the first of the problem areas.
# If a +B over current is detected, stoppage of vertical deflection is detected simultaneously. The symptom that is diagnosed first by the micro controller is displayed on the screen.
## If Standby/Stereo LED flashes [6] times, unplug the unit and wait 10 seconds before performing the adjustment.
Results for all of the following diagnostic items are displayed on screen. If the screen displays [0], an error has occurred.
Diagnostic item
|
Lamp flashes
|
Display result
|
Probable cause location
|
Detected symptom
|
Power does not turn On
|
Does not light
|
---------
|
Power cord is not plugged in.
Fuse is burned out [F501]. [A-board]
|
Power does not come On.
No power is supplied to TV.
AC Power supply is faulty.
|
+B Over Current Protection [OVP]
|
2 times
|
2:0 or 2:1
|
H.OUT [Q5030] is shorted. [D-Board].
+B PWM [Q5003] is shorted (D-Board).
|
Power does not come on.
Load on power line is shorted.
|
Low +B Over Voltage [OVP]
|
3 times
|
3:0 or 3:1
|
IC6505 is faulty. (D-board)
|
Has entered standby mode.
|
Vertical Deflection stopped.
|
4 times
|
4:0 or 4:1
|
15V is not supplied (D-Board).
IC5004 is faulty. (D-Board).
|
Has entered standby mode after Horizontal raster.
Vertical deflection pulse is stopped.
Power line is shorted or power supply is stopped.
|
White Balance failure.
|
5 times.
|
5:1 of 5:0
|
Video Out [IC9001 – IC9003] is faulty. (CH, CX Board).
CRT drive [IC2801] is faulty. (B Board).
G2 (Screen) is improperly adjusted.
|
No raster is generated.
CRT cathode current detection reference pulse output is
small.
|
LOW +B OCP / OVP [over current | over voltage].
|
6 times
|
6:0 or 6:1
|
+5V line is overloaded. (A, B, M Boards).
+5V line is shorted. 9A, B, M Boards).
IC504 faulty [A-board]
|
No picture.
|
Horizontal deflection stopped.
|
7 times
|
7:1 or 7:0
|
=======
|
No picture, No EHT. Dead set.
|
INTERNAL VIEW - PCB LOCATIONS
DISASSEMBLY PROCEDURE
REAR COVER REMOVAL
# Lift lever up on the right and left sides of the chassis bracket, and gently pull the chassis away from bezel.
## Pull up and rotate both the 'A' and 'D' boards in order to service the unit.
Caution: Heat sink of IC5004 is ( --15V). Care must be taken not to allow heat sink to touch any other components.
# Lift lever up on the right and left side of the chassis bracket, and gently pull the chassis assembly away from the bezel.
## Pull up and rotate both A & D boards in order to service the unit.
### When plugging the connector from HM board to B board at CN3603, ensure two brown wires are facing upward towards neck assembly.
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