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voltage : +12V ,+12V,+12V ,+12V
connector:CN2（P1,P2,P3,P4）
12.3 Main board failure check
State:No picture
First,check cables which connect with PSB and the Lvds wire with the panel.
State：No sound
First，check cables which connect with Main Board，then check as follows
1) Check input voltage as NO picture
2) Check speaker output
First,check speaker anode(+) and cathode(-),confirm speaker short or not. If short ,replace speaker.
Second,check CN21 with oscillograph, confirm wave output or not.
Connector: CN21.
12.4 Pannel failure
Failure Mode
Part
Name
Description
V B/D
Vertical bar
Vertal
V Dim
line
Vertical color
V L/D
line(light
TCP
dark forever)
Horizontal
H B/D
bar
Horizontal
H Dim
gary line
Horizontal
H L/D
line(light
dark forever)
Failure Mode
Part
Name
Phenomena
gray
or
or
Description
Failure cause
Block Defect :TCP cracking or cracking
Dim or L/D
:TCP Sunken
:TCP lead cracking
:ACF bonding short
:Awful environment and something electric enter into
LCD
:Mis-align between TCP and Panel
:Panel failure
:TCP failure
Phenomena
42
Failure cause
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