Sony KV-HF21M80 service manual Self Diagnostic Function, Diagnostic Test Indicators

KV-HF21M80

RM-952

SELF DIAGNOSTIC FUNCTION

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.

1.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.

Result for all of the following diagnostic items are displayed on screen. No error has occured if the screen displays a “0”.

Diagnostic	No. of times	Self-diagnostic	Probable	Detected
Item	STANDBY/TIMER	display/Diagnostic	Cause	Symptoms
Description	lamp flashes	result	Location
• Power does not	Does not light	—	• Power cord is not plugged	• Power does not come on.
turn on			in.	• No power is supplied to the
			• Fuse is burned out F4601	TV.
			(F)	• AC power supply is faulty.
• +B overcurrent	2 times	002:000 or	• H.OUT Q511 is shorted. (A	• Power does not come on.
(OCP) or		002:001~255	board)	• Load on power line is
overvoltage		003:001~255	• IC1800 is shorted.	shorted.
(OVP)		004:001~255	(C3 board)	• Has entered standby state
• Vertical deflection		at the same time	• -13V is not supplied. (A	after horizontal raster.
stopped			board)	• Vertical deflection pulse is
• Horizontal			• IC 503 faulty (A board)	stopped.
deflection			• IC 301 faulty (A board)	• Power line is shorted or
overdrive				power supply is stopped.
• White balance	5 times	005:000 or	• G2 is improperly adjusted.	• No raster is generated.
failure (no		005:001~225	(Note 2)	• CRT cathode current
PICTURE)			• CRT problem.	detection reference pulse
			• Video OUT IC1800 is faulty.	output is small.
			(C3 board)
			• IC301 is faulty. (A board)
			• No connection A board to
			C3 board.
• Micro reset	—	101:00 or	• Discharge CRT (C3 Board)	• Power is shut down shortly,
		101:001~225	• Static discharge	after this return back to
			• External noise	normal.
				• Detect Micro latch up.

Note 1: 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. Note 2: Refer to screen (G2) Adjustment in section 3-4 of this manual.

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