SONY TRINITRON KV20S90 SERVICE MODE & LED BLINKING CODES.

             TO ENTER SERVICE MODE [REMOTE CONTROL RM-Y155]

• Make the set to 'Standby' mode.  [Switch it on by its AC mains Power Switch, and press the 'Power' button on the remote control to make it 'Standby'.
• In Standby mode, press [Display => Channel (5) => Volume (+) => Power] buttons by remote control.  Press each button within a second of each other.
• Service Mode will be displayed as follows:

=====================================

SERVICE                   HSIZ                          0

=====================================

Descriptions:

• SERVICE > Mode.
• HSIZ > Display item.
• 0 > Data

Press [1] of [4] button on the remote Conrail to call an item to adjust.

Press  [3] of [6] button on the remote control to adjust the data value to selected item.
Press [Muting] and then press [Enter] button to write the adjusted data value into memory.
Turn 'OFF the set to 'Exit' service mode.
Press [8] then 'Enter' on the remote control to initialize.  After replacing the memory IC [IC003] carry out initialization.
 MEMORY WRITE CONFIRMATION METHOD

• After all adjustments, pull out the plug from AC outlet, then re-insert the plug in the AC outlet again.
• Turn the 'Power Switch' ON and set to Service Mode.
• Call the adjusted items again, to confirm they were adjusted.

LED BLINKING CODES

When an error occurs, the Standby/Timer LED will flash a set number of times to indicate if possible cause of the problem.  If there is more than one error, the LED will identify the first of the problem areas. 

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

SELF-DIAGNOSTIC FUNCTION [LED BLINKING CODES]

Diagnostic item description	No. of times standby/timer LED lamp flashes.	Self diagnostic display/Diagnostic result	Probable cause location.	Detected symptoms.
Power does not turn ON	Does not flash	----------------	# Power cord is not plugged in.  # Fuse is burned out [F601] (A-Board)	# Power does not come ON.  # No power is supplied to TV.  # AC power supply is faulty.
+B overcurrent (OCP)	2 times	2:0 or 2:1	# H.Out [Q502] is shorted.(A-Board)  # IC1751 is shorted (C-Board)	# Power does not come ON.  # Load on power line is shorted.
Vertical deflection stopped	4 times	4:0 of 4:1	# +13V is not supplied (A-Board). # IC541 is faulty (A-Board)	# Has entered standby state after horizontal raster.  # Vertical deflection pulse stopped.  # Power line is shorted or power supply is stopped.
White balance failure	5 times	5:0 or 5:1	# Video Out [Q392 to 394] is faulty (A-Board).  # IC 301 is faulty (A-Board).  # Screen [G2] is improperly adjusted.	# No raster is generated.  # CRT cathode current detection  reference pulse output is small.