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TV Products CSV-1
Service Bulletin
Sony Service Company - Technical Services
A Division of Sony Electronics Inc.
Sony Drive, Park Ridge, New Jersey 07656
Model: KV-20TS32/20V50 No. 230
Subject: Afterglow On BA-1 Chassis Date: October 13, 1994
Symptom:
(12) After the unit is turned off or unplugged, a small un-focused spot, on the screen, may
remain lit.
Solution: This phenomena known as Afterglow is normal. It is mostly noticeable when the
room lighting is low.
Due to the ability of the tube to hold a charge an Afterglow can be seen. This
Afterglow duration depends on how fast the tube discharges. This phenomena will
not harm the circuits, CRT, or shorten the life of the set.
Caution: It is necessary to discharge this tube before handling. Please consult the Service
Manual, under the heading Picture Tube Removal, for details on how to discharge
this tube.
Circuit Upgrade: If a customer can not accept the Afterglow it can be reduced by replacing
IC-101 and resetting the ID codes as listed below:
Models Applicable Serial Numbers Applicable Serial Numbers Applicable Serial Numbers
Afterglow might be Spot Killer circuit added New Micro used to reduce
Observed Afterglow
KV-20TS32 8,100,001-8,113,000 8,113,001-8,132,000 8,132,001-And beyond
KV-20V50 8,100,001-8,107,000 8,107,001-8,109,361 8,109,362-And beyond
Note: The spot killer circuit was discontinued, since the new micro circuit does the job that the Spot Killer circuit
performed.
Reference Former New Part Number
IC-101 CXP-80424-065S CXP-80424-084S 8-752-856-00
Note: The ID-0 code must also be changed as per the chart below:.
Model No. Disp. Former New Data Model No. Disp. Former New Data
KV-20TS32 50 ID-0 104 105 KV-20V50 50 ID-0 120 121
Reference: FPR-P PRINTED IN USA
Autoflagged - NO
PRINTED ON RECYCLED PAPER