3.Pannel and vsc connect bad

Bright and dark

Flashing

display alternately

Failure

Mode

 

 

 

 

 

 

 

 

 

 

 

 

Part

Name

Description

Phenomena

 

Failure

cause

 

 

 

White

 

B/L

normal,

only

!

 

 

 

 

 

 

 

 

white

 

screen

 

 

 

 

 

 

 

Screen

 

 

 

 

 

 

 

 

 

 

display

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maybe caused by surge current and EDS

 

Black

 

B/L

normal,

only

 

 

 

 

 

 

 

 

 

Black

 

screen

 

 

 

 

 

 

 

 

Screen

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

display

 

 

 

 

 

 

 

 

 

Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Flicker

 

Crosstatk

 

 

LCD Vcom

imbalance

 

 

 

 

 

Abnormal

Only

 

 

color

Capacitance

improper bring crosstalk

inside

LCD

 

Color

 

abormal

 

 

pannel

 

 

 

 

 

 

 

 

 

Only

 

 

color

1 .Chip lose

action

 

 

 

 

 

Abnormal

 

 

2. IC short

or jointion

bad

 

 

 

 

abnormal

 

 

 

 

 

 

Color

 

 

 

3.Pannel

and vsc connect

bad

 

 

 

 

 

 

 

 

 

 

Failure

Mode

 

 

 

 

 

 

 

 

 

 

 

 

Part

Name

Description

 

Phenomena

 

Failure

cause

 

 

 

Mechanical

When

 

 

turn

Caused

by

Mechanica

noise of

backlight

 

panel,appear

 

 

Noise

 

 

unit

 

 

 

 

 

 

 

 

cacophony

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ripple

 

Connectric

circle

Causeed

by between mechanism

and

 

 

pannel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B/L off

 

B/L lose action

 

*Connect

 

badness

between

wire

and

 

 

 

electrode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B/L dark

B/L

brightness

*Connectbadness

 

 

 

 

 

darker

than

normal

Shortbetween wire and electrode

 

 

 

 

 

 

B/L

wire

B/L wire damaged

Operation

abnormal or systemic

noise

 

 

 

damaged

 

 

 

 

 

 

 

 

 

 

 

 

 

 

54

Page 54
Image 54
Haier HL42XR1 Pannel and vsc connect bad, Maybe caused by surge current and EDS, LCD Vcom Imbalance, Chip lose Action