Sony KP-57XBR10W Service Bulletin page 2

TV Products Service Bulletin No. 531
Service data adjustment to Improve Edge Enhancement in NTSC mode:
Change the Service data in both categories MCP4 and MCP5. (Categories)
The adjustment item "SYS" data should be changed from 2 to 1 in both TV and Video modes.
Write the new Service data settings.
Screen Adjustment G-2/ Sub-bright adjustment:
Equipment required: Darkened Room and/or a heavy blanket to cover the set.
Signal Applied/Input: Select Video 1 input / No signal applied
Adjust points: G2 (Screen Controls) VRs for RGB and Sub-Brightness register
Conditions: Darken Room preferred. If not possible, a blanket must cover the front of the screen.
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Standard Picture Mode (reset mode to ensure proper setting of this mode)
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Turn off ALL the CRT outputs in Service mode.
Confirmation Procedure:
1. To confirm proper setting (with all 3 CRTs OFF), the screen should ALMOST be at cut-off.
2. If not, check Sub-Bright Data in the service mode. Service data Range is usually 21 to 25 in the
Service menu, category "MCP2", adjustment item 01 "SBRT".
3. If the picture is still not at almost cut-off, proceed to the adjustment procedure below.
Important Notes on G2 setup: It is crucial that the G2 adjustment be done as accurately as possible. If it is
off even slightly, white balance and focus can be greatly affected. Also, if the G2 is set incorrectly, it may
cause an intermittent video shutdown condition, due to the affect on the IK circuit.
Therefore, the following procedure must be adhered to:
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The room should be as dark as possible.
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Also, a blanket (standard heavy mover's blanket used to protect furniture) is required
for this procedure. The blanket must be placed over the technician and the front of the TV
screen to minimize the ambient light. Only with this method can the technician see the correct
adjustment level.
Adjustment Procedure:
1. Turn the green screen control on the Focus Block until retrace lines appear and gradually turn it back
until the point where you can see the retrace line disappears, just before cutoff.
2. Turn the red screen control on the Focus Block until retrace lines appear and gradually turn it back
until the point where you can see the retrace line disappears, just before cutoff.
3. Turn the blue screen control on the Focus Block until retrace lines appear and gradually turn it back
until the point where you can see the retrace line disappears, just before cutoff.
4. If the screen still appears too bright after proper G-2 adjustment, please adjust the sub-bright
control down until screen cut-off. (Service data Range is usually 21 to 25 in the Service menu,
category "MCP2", adjustment item 01 "SBRT").
Screen Controls Located on Focus Block