Sony KV-20S90, KV-21SE43C service manual Self-Diagnostic Screen Display, Self Diagnostic

Page 7

KV-20S90 / 21SE43C

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 conﬁrmation.

To Bring Up Screen Test

In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:

Display Channel

5 Sound Volume

- Power ON

Note that this differs from entering the Service Mode (Sound Volume

+

).

Self-Diagnostic Screen Display

SELF DIAGNOSTIC

2:000

3:N/A

4:000

5:001

101:N/A

Numeral “0” means that no fault was detected. Numeral “1” means a fault was detected one time only.

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

				IC301
			Y/CHROMA JUNGLE
FROM
FROM
CRT			21 IK IN
CRT			21 IK IN
FROM			18 HP/PROTECT
IC521
IC521
PIN 7				SDA 35

	IC541	IC001		IC003
	V. OUT	SYSTEM		MEMORY
		IO-BDAT	36	5 BDA
	REF 3	17 I-PROT	36	5 BDA
	REF 3	17 I-PROT
		O-LED	18
		37		DISPLAY
		IO-SDAT		DISPLAY
		IO-SDAT

+B overcurrent (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.

Vertical Deﬂection Stopped

Occurs when an absence of the vertical deﬂ ection pulse is detected by pin 17 of IC001. Power supply will shut down when waveform interval exceeds 2 seconds.

White Balance Failure

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).

— 7 —

Image 7

Contents Trinitron Color Television Table of Contents Lbs SpecificationsSAFETY-RELATED Component Warning Leakage Test Safety CHECK-OUTSelf Diagnosis SELF-DIAGNOSTIC FunctionSelf Diagnostic Self-Diagnostic Screen DisplayChassis Assembly Removal Service Position DisassemblyRear Cover Removal HOW to Handle AN Anode CAP Anode CAP Removal ProcedurePicture Tube Removal Adjustment Procedure SET-UP AdjustmentsBeam Landing Vertical Static Convergence ConvergengeScreen G2 Dynamic Convergence AdjustmentSCREEN-CORNER Convergence FocusService Adjustment Mode Memory Service Adjustment ModeWhite Balance Adjustments Preparation Before Confirmation Safety Related AdjustmentsHOLD-DOWN Readjustment B+ Voltage Confirmation and AdjustmentDigital Digital Power Multimeter SupplyCircuit Adjustments Data Initial Average Adjustment Items 1Function Range Data Video Board Adjustments Frequency Adjustment Adjustment Items 2ID MAP SUB HUE, SUB Color Adjustment SHUE, Scol SUB Contrast Adjustment RdrvDisplay Position Adjustment Disp SUB Bright Adjustment SbrtLinearity VLIN, V. Correction Size Adjustment VsizCenter Adjustment Vpos Center Adjustment HposReference Information DiagramsPrinted Wiring Board and Schematic Diagram Information Circuit Boards LocationDY Assy Block Diagram and SchematicsINT Board Schematic DiagramREF. no Location Board Variant Model ListPIN Volt Board IC Block DiagramsBoard IC Voltage List IC521 NJM4558M-TE2Cvco Demod IC301 CXA2133BSCrystals Board Locator ListDiode TransistorKG KB G2 CRT RGB DRIVE, CRT Drive Semiconductors Chassis KV-20S90/21SE43C Exploded ViewsREF. no Electrical Parts ListCeramic Fuse ConnectorPhoto Coupler JackChip Conductor CoilMetal Chip Metal Varistor SwitchRelay TunerRemote Commander Accessories and Packaging2LA TX 1C 3LA TX NIL BA ADS LCS IRD CCV +EVIRD Trinitron Color TV Page Safety Precautions Notification Grounding or Polarization Important SafeguardsPower Sources For the set with a polarized AC power cord plugAttachments CleaningOverloading Object and Liquid EntryPower-Cord Protection AccessoriesVentilation Antenna Grounding According to the NEC Outdoor Antenna GroundingLightning Servicing Damage Requiring ServiceReplacement Parts Safety CheckPage Contents Page Introduction Trinitron Color TV FeaturesAbout this Manual Batteries for the Remote ControlTV with indoor or outdoor antenna, or Catv cable Basic ConnectionsTV and VCR Connecting Additional EquipmentRear of TV Cable Box Rear of TV TV and Cable BoxVCR TV, VCR, and Cable boxConnecting Headphones Connecting a CamcorderPage Button Description Using the Remote Control and Basic FunctionsIf you lost your remote control, see To perform Auto Setup again Setting Up the TV AutomaticallyMenu Quick Start to the MenusTo access a menu Using the Video menuPress f to Press F to KV-20S90 only Using the Audio menuON/OFF Timer Scheduled viewing Using the Timer menuFavorite Channel Quick access to favorite channels Using the SET UP menuCable Channel SET UP menuAge Using Parental ControlContents Defined as Overview of the RatingsPG-13 Rating Defined asNC-17 Rating C8+14+ 18+Activating Parental Lock Initial access into Parental ControlUsing the Custom menu Setting the RatingRating TV will allow a maximum rating Information for Parents Resetting your passwordPage Troubleshooting Cable stations don’t seem to work Remote controlTo be cleaned Lost passwordFor all models except as noted SpecificationsPage Index TV Rating A. Ratings 20 Unrated Page Page Page Page Page Page To Print Tiled Version of Schematics NON-SCHEMATIC PagesSchematic Diagrams To Print Full Size Schematic DiagramsON-SCREEN Search Option Original Manual Issue Date 4/2001