Self-Diagnostic Function - Sony TRINITRON KV-32HS20 Service Manual

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/STEREO LED will automatically begin to fl ash. The number
of times the LED fl ashes translates to a probable source of the problem. A defi nition of the STANDBY/STEREO LED fl ash 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 error occurs, the STANDBY/STEREO LED will fl ash a set number of times to indicate the possible cause of the problem. If there is more
than one error, the LED will identify the fi rst of the problem areas.
Results for all of the following diagnostic items are displayed on screen. If the screen displays a "0", and error has occurred.
Diagnostic Item
Power does not turn on
+B overcurrent (OCP)
(see Note 1)
Low B overvoltage (OVP)
Vertical defl ection stopped
White balance failure
(not balanced)
LOW B OCP/OVP
(overcurrent/overvoltage)
(see Note 3)
Horizontal Defl ection stopped
Note 1: If a +B overcurrent is detected, stoppage of the vertical defl ection is detected simultaneously. The symptom that is diagnosed fi rst by the microcontroller is displayed on screen.
Note 2: Refer to Screen (G2) Adjustment in Section 3-4 of this manual.
Note 3: If STANDBY/STEREO LED fl ashes six (6) times, unplug the unit and wait 10 seconds before performing the adjustment
Display of Standby/Timer LED Flash Count
Diagnostic items Flash count
+B overcurrent
+B/Low B overvoltage
Vert. deflection stopped
White balance failure
Low B error
Horiz. deflection stopped
Lamp ON 0.3 sec.
Lamp OFF 0.3 sec.
Stopping the Standby/Timer LED Flash
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 fl ashing.
Self-Diagnostic Screen Display
For errors with symptoms such as "power sometimes shuts off" or "screen sometimes goes out" that cannot be confi rmed, it is possible to bring up
past occurrences of failure on the screen for confi rmation.

SELF-DIAGNOSTIC FUNCTION

No. of times STANDBY/
STEREO lamp fl ashes Display Result
Does not light
2 times
3 times
4 times
5 times
6 times
7 times
2 times
3 times
4 times
5 times
6 times
7 times
Lamp OFF 3 sec.
KV-32HS20/36HS20/36HS20H/32XBR450/36XBR450/36XBR450H
Probable Cause Location
• Power cord is not plugged in.
• Fuse is burned out (F5501)
2:0 or 2:1 • H.OUT (Q5030) is shorted. (D Board)
• +B PWM (Q5003) is shorted (D Board)
• IC9001, IC9002, IC9003 is shorted (C Board)
3:0 or 3:1 • IC6505 is faulty. (D Board)
4:0 or 4:1 • ± 15V is not supplied. (D Board)
• IC5004 is faulty. (D Board)
5:0 or 5:1 • Video OUT (IC9001-IC9003) is faulty.
(C Board)
• CRT drive (IC201) is faulty. (A Board)
• G2 is improperly adjusted. (see Note 2)
6:0 or 6:1 • +5 line is overloaded. (A, B Boards)
• +5 line is shorted. (A, B Boards)
• IC6007 is faulty. (A Board)
7:0 or 7:1
— 6 —
Self Diagnosis
Supported model
Detected Symptoms
• Power does not come on.
• No power is supplied to the TV.
• 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 defl ection 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
Standby/Timer LED
* One fl ash count is not used for self-
diagnostic.