Haier HLC22RW, Service Manual

Page: 38 / 55

38
Abnormal
Display
Abnormal Display
Circuit
Flashing
Bright and dark
display alternately
1. Chip lose action
2. IC ahort or jointiog bad
3. Panel and vsc connect bad
Failure Mode
Part Name Description Phenomena Failure cause
White
Screen
B/L normal, only
white screen
display
Black
Screen
B/L normal, only
Black screen
display
Maybe caused by surge current and EDS
FIIcker Crosstalk
LCD Vcom imbalance
Abnormal
Color
Only color
abormal
Capacitance improper bring crosstalk inside LCD
pannel
Circuit
Abnormal
Color
Only color
abnormal
1. Chip lose action
2. IC short or jointion bad
3. Pannel and vsc connect bad
Failure Mode
Part Name Description Phenomena Failure cause
Mechanlcal
Nolse
When turn
panel,appear
cacophony
Caused by Mechanica noise of backlight
unit
Ripple Connectric circle
Caused by between mechanism and panel
B/L off B/L lose action
*Connect badness between wire and
electrode
B/L dark B/L brightness
darker than normal
*Connect badness
Short between wire and electrode