Service Manuals, User Guides, Schematic Diagrams or docs for : Sony sony tv bulletins sony tv bulletins TVP0507
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S CONFIDENTIAL CSV-1
Sony Service Company
National Technical Services Service Bulletin
A Division of Sony Electronics Inc.
Park Ridge, New Jersey 07656 TV Products
Model: KV-32XBR400, KV-36XBR400 No. 507R1
Subject: TV Turns Itself Off. Date: August 8, 2001
Symptom:
(3111) The TV turns itself off after the customer has been watching it for a while. It may turn
off within minutes of turning it on, or it may take an hour or more before it turns itself
off. The set can usually be turned back on again by cycling the TV's front panel
power switch.
Solution: This symptom may be caused by a drift of the hold-down adjustment that was set at
the factory. As this adjustment in the field requires the replacement of 3
potentiometers on the D-board and the availability of a precision high-voltage meter
(0.2 Kv resolution), the recommended solution is to replace the D-board.
MODEL DESCRIPTION PART NUMBER
KV-32XBR400 D-BOARD A-1346-947-A
KV-36XBR400 D-BOARD A-1346-948-A
KV-32XBR400 HIGH VOLTAGE LEAD 1-251-715-22
KV-36XBR400
KV-32XBR400 FOCUS LEAD 1-900-805-19
KV-36XBR400
NOTE 1: After replacing the D-board the original board must be sent back to Sony
where it will be re-adjusted and returned to float stock. Countermeasures will be
applied to these boards to prevent the hold-down adjustment from drifting.
Instructions and paperwork for returning the boards to Sony are included with new
D-boards supplied by WRPC-AS. In the event the return shipping materials are not
available, please be sure to return the boards to the following address:
Sony Technology Center
Attention S.A.Y.S. Dept.
Dock #22
1001 Technology Drive
Mt. Pleasant, Pa. 15666
Be sure to include the following information:
NARDA claim number, invoice number, model number, serial number, customer
name and phone number, your name, your company name, your Sony servicer
account number and parts account number, and the date the repair was performed.
This information is required to ensure that your parts account will be credited for the
core charge when the original board is returned.
IMPORTANT! See note 2 on next page.
Reference: PRINTED IN USA
TV Products Service Bulletin No. 507R1
NOTE 2: Early production units used a high-voltage block between the flyback
transformer and the CRT. In this case, the high-voltage block must be bypassed, and
the original high-voltage leads must be removed from the high-voltage block and
discarded. New boards received from WRPC-AS require a high-voltage lead that
connects directly to the CRT from the flyback transformer. Some D-boards
received from WRPC-AS will include the proper HV and focus leads, while other
boards received will not include any leads. Therefore, if you do not have a
spare HV lead (part number 1-251-715-22) and a new focus lead (part number
1-900-805-19) you must order these leads when you order the D-board.
DX-1A [C]
CHASSIS ANT
ASSEMBLY SW [W]
MAIN
[BC]
SUB
[U]
[B] BUSCONN
[D]
[S]
[A]
Some sets have a
high-voltage
block. This block
must be bypassed
when replacing the
[HB] [HA] D-board. The new
high-voltage lead
must be connected
directly between
the new D-board
and the CRT. The
original high-
voltage leads must
be removed and
discarded.
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