Sony TRINITRON RM-Y156, Service Manual

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KV-21ME43 KV-21ME43
KV-21ME43 KV-21ME43
KV-21ME43
Handling of Self-diagnostic Screen Display Handling of Self-diagnostic Screen Display Handling of Self-diagnostic Screen Display Handling of Self-diagnostic Screen Display 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 Clearing the Result Display
Clearing the Result Display Clearing the Result Display 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:
ENTER Channel 8
Quitting the Self-Diagnostic Scr Quitting the Self-Diagnostic Scr
Quitting the Self-Diagnostic Scr Quitting the Self-Diagnostic Scr Quitting the Self-Diagnostic Screen
een
een een een
To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.
Self-diagnostic Circuit Self-diagnostic Circuit
Self-diagnostic Circuit Self-diagnostic Circuit
Self-diagnostic Circuit
IC301
Y/CHROMA JUNGLE
IC541
V. OUT
IC001
SYSTEM
IC003
MEMORY
IK IN
FROM
CRT
21
HP/PROTECT
SDA
FROM
IC521
PIN 7
18
35
IO-SDAT
O-LED
37
REF 3 I-PROT
IO-BDAT
17
36 B-DAT 5
18
DISPLAY
+B over +B over +B over +B over +B overcurr curr curr curr current (OCP) ent (OCP) ent (OCP) ent (OCP) ent (OCP)
Occurs when an overcurrent on the +B (115V) line is detected by pin 18 of IC301. If the voltage
of pin 18 of IC301 is less than 1V when V.SYNC is more than seven verticals in a period, the
unit will automatically turn off.
V V V V Ver er er er ertical deflection stopped tical deflection stopped tical deflection stopped tical deflection stopped tical deflection stopped Occurs when an absence of the vertical deflection pulse is detected by pin 17 of IC001. Power
supply will shut down when waveform interval exceeds 2 seconds.
White balance failur White balance failur
White balance failur White balance failur White balance failure
ee
ee If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be
detected by IC301. TV will stay on, but there will be no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K.)