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2.no picture and have sound：
Check
N501
Check N302
yes
Test
R342-345
YC signal
yes
sub
Test
n302
pin72 signal
Test N102
main
pin72 signal
yes
Test
R145-148
YC signal
abnormal
Check
N102
abnormal
Check
N204
A
VGA work's
normal
Check if there's
initial screen with
logo appearing
No picture
no
B
TV
no
A
DVI
In which signal
channel ther is no
AV
picture
YPBPR/YCBCR
Both
YPBPR
YCBCR no picture
no
Check N1
normal
Test
R207-213
and N204
normal
Check
N501
Check socket
X401
N403
connection
no
yes
yes
board,X709 pin8,check
Check
N501
Check n601
C
VGA
to
N601 bad
yes
Judge if the troble is
YPBPR and YCBCR
YCBCR
Check
Check
N302
N501
abnormal
Check N402
and
Check
N403
24
Turn of power board
and signal process
if the screen light up?
yes
Screnn bad
abnormal
Check N501
both
YPBPR
Check
signal
VGA
Check
N403
Check R414
no
normal
nomar
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