Yamaha PDM-4220 Service Manual page 46

PDM-4220
NO Fault contents
9 Horizontal bar
10
11 Image sticking
12 Stains
13 Twinkle
14 Flicker
15 Luminance is
abnormal
16 Chrominance
is abnormal
17 Sync is
disturbed
18 Picture
distorted
St eps of
19
gradation are
skipped
20 Abnormal
sound
46
Fault status
Bar width of 1/8 or multiples of
1/8 of the screen height, is
displayed.
Abnormal (Screen does not
light)
Bar width of 1/2 of the screen
height.
Abnormal display
(Screen does not light)
Fixed display contents are
always displayed.
Oval-shaped points having
abnormal luminance are
scattered in the upper or lower
part of screen.
The entire screen momentarily
becomes brighter or darker.
The entire screen flickers
continuously.
Screen is too dark or too bright.
(Out of specifications)
Colors cannot be displayed
correctly.
Luminance linearity is poor.
Suspected
fault
location
Panel chassis
Panel chassis
Y-SUS
X-SUS
Above boards
are connected.
Panel chassis
ABCDEF
Panel chassis
Poor connector
contact
(CN2,3,21,31)
LOGIC
LOGIC
LOGIC
LOGIC
PSU
X-SUS
Y-SUS
(Core is broken,
or transformer
is abnormal.)
Analysis procedure
and measure
Replace panel
chassis
Refer to Chapter
4.6.3
Perform all white heat
run. After judgment,
replace panel chassis
Perform all white heat
run. After judgment,
replace panel chassis
Connector / cable
re-connection or
Cable exchange
Replace LOGIC
board
Replace LOGIC
board
Replace LOGIC
board
Replace LOGIC
board
Locate cause of
abnormality from
listening and viewing.
Replace the cause of
problem.