Handling Of Self-Diagnostic Screen Display; Clearing The Result Display; Quitting The Self-Diagnostic Screen; Self-Diagnostic Circuit - Sony Trinitron KV-32XBR400 Service Manual

KV-32XBR400/36XBR400/36XBR400H/38DRC1/38DRC1C

Handling of Self-Diagnostic Screen Display

Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during
repairs. When you have completed the repairs, clear the result display to "0".
Unless the result display is cleared to "0", the self-diagnostic function will not be able to detect subsequent faults after completion
of the repairs.

Clearing the Result Display

To clear the result display to "0", press buttons on the Remote Commander sequentially when the diagnostic screen is displayed,
as shown below:
Channel 8 ENTER

Quitting the Self-Diagnostic Screen

To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.

Self-Diagnostic Circuit

+B overcurrent (OCP)
+B overvoltage (OVP)
Vertical Deflection Stopped
White Balance Failure
Low B Error
Horizontal Deflection Stopped Occurs when either 1) a +B overcurrent is detected (IC5007) or 2) overheating is detected
Occurs when an overcurrent (more than 6A) on the +B (135V) line is detected by R6598/
R6591. It will cause Q6520 to turn on and force the AC relay to turn off through Q6532 and
Q6530.
Occurs when 1) overvoltage (more than +140V) on the +B (135V) line is detected by IC6505
or 2) an overvoltage (more than 7.5V) on the unreg 7V line is detected by D6014. The AC
Relay will turn off through Q6532 and Q6530.
Occurs when an absence of the vertical deflection pulse is detected by IC201. Power supply
will shut down when waveform interval exceeds 2 seconds.
If the RGB levels do not balance within 2 seconds after the power is turned on, this error will
be detected by IC201. The unit will stay on, but there will be no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).
Occurs when set 5V is out.
(Thermistor TH5002).
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