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Self Diagnosis Function - Sony KP-HR43K90J Service Manual

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Summary of Self-Diagnosis Function
This device includes a self-diagnosis function.
In case of abnormalities, the STAND BY indicator automatically blinks. It is possible to predict the abnormality location by the
number of blinks. The Instruction Manual describes blinking of the /STAND BY indicator.
If the symptom is not reproduced sometimes in case of a malfunction, there is recording of whether a malfunction was generated
or not. Operate the remote command to confirm the matter on the screen and to predict the location of the abnormality.
Diagnosis Items and Prediction of Malfunction Location
When a malfunction occurs the STAND BY indicator only blinks for one of the following diagnosis items. In case of two or
more malfunctions, the item which first occurred blinks. If the malfunctions occurred simultaneously, the item with the lower
blink count blinks first.
The screen display displays the results regarding all the diagnosis items listed below. The display " 0 " means that no malfunc-
tions occurred.
No. of times
Diagnosis Item
indicator blinks
Power does not turn on
+B overcurrent (OCP)
(See Note 1)
+B overvoltage (OVP)
Vertical deflection stopped
White balance failure
(Not balanced)
(Overcurrent/over voltage)
(See Note 3)
Horizontal deflection stopped
High voltage error
Audio error
Note1: If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously. The sympton that is diagnosed first by the microcontroller is displayed on screen.
Note 2: Refer to Screen (G2) Adjustment in Section 3-1, 2 of this manual.
Note 3: If STANDBY indicator blinks six (6) times, unplug the unit and wait 10 minutes before performing the adjustment.
Blinking count display of STAND BY indicator
STAND BY indicator
Release of STAND BY indicator blinking.
The STAND BY indicator blinking display is released by turning OFF the power switch
on the TV main unit or removing the plug from the power.


Probable Cause Location
•Power cord is not plugged in.
• Fuse is burned out (F6001) (G board)
• H. OUT (Q8024) is shorted. (D board)
2 times
• +B PWM (Q8035, 8038) is shorted. (D board)
• IC501 is faulty (G board)
3 times
• IC5002 is faulty (G board)
• +- 15V is not supplied. (D board)
4 times
• IC8003 is faulty. (A board)
• Video out (IC7101, 7201, 7301) is faulty. (CR, CG, CB board)
•CRT drive (IC309) is faulty. (A board)
5 times
•G2 is improperly adjusted. (See Note 2)
• +5 line is overloaded. (A, B boards)
6 times
• +5 line is shorted. (A, B boards)
7 times
• Q8035, 8038 is shorted. (D board)
8 times
• T8005 is faulty. (D board)
• +- 19V line is shorted. (A, B boards)
• IC708 is faulty. (A board)
9 times
• PS701 or PS702 is opened. (A board)
One blink is not used for self-diagnosis.
<Diagnosis Items> <Number of Blinks>
+B overcurrent
+B overvoltage
Vertical deflection stop
Deteced symptoms
• Power does not come on.
• No power is supplied to the unit.
• AC power supply is faulty.
• Power does not come on.
• Load on power line is shorted.
• Has entered standby mode.
• Has entered standby state after horizontal raster.
• Vertical deflection 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 picture
• No picture
• No sound
2 times
3 times
4 times
amp ON : 0.3 seconds
amp OFF : 0.3 seconds
– 5 –
amp OFF :
3.0 seconds


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