Sony FWD-50PX2, Service Manual

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3-3
FWD-50PX2
3-4. Image Trouble
Main symptoms
.
Dot noise
.
Picture noise
.
Bad color
.
Vertical dot noise
.
Unstable image
.
No image
.
Broken OSD
.
No inversion
.
No power saving
.
Clock error
.
No screen saver
.
Flashing picture
.
Dark picture
.
Unstable caption/text
Image is abnormal.
No
Yes
There is a high possibility that
the A board caused the trouble.
→
Replace the A board.
Are all input signals abnormal?
(RGB/DVI/YUV/CVBS)
Yes
Is the connection of the A board
abnormal?
Yes Is the G board abnormal?
Replace the G board.
Yes Is the CTRL board or peripheral
circuit abnormal?
Replace the CTRL board.
Yes Is the Y SUS board abnormal?
Replace the Y SUS board.
Replace the Z SUS board.
n
After replacing the parts, perform the following
adjustments.
. AD calibration adjustment (Refer to Section 2.)
. White balance adjustment (Refer to Section 2.)
. EDID data input
. S-init Goods (Refer to Section 2.)
n
After replacing the parts, perform the following
adjustments.
. AD calibration adjustment (Refer to Section 2.)
.
White balance adjustment (Refer to Section 2.)
. EDID data input
. S-init Goods (Refer to Section 2.)
n
After replacing the G board, perform
the following adjustments.
.
Va Voltage Adjustment (Refer to Section 2-3.)
. Vs Voltage Adjustment (Refer to Section 2-3.)
n
For the replacement parts, refer to Section 4.
The parts other than those described in Section 4 are
not service parts. When the replacement of those parts
is required, replace them in the assembly unit.
No
No
No
No
Connect correctly. If the trouble
persists, replace the A board.
Yes
Is the A board abnormal?
n
After replacing the parts, perform the following
adjustments.
. AD calibration adjustment (Refer to Section 2.)
.
White balance adjustment (Refer to Section 2.)
. EDID data input
. S-init Goods (Refer to Section 2.)
No
Replace the A board.