No Picture: Except Hfr Model - Sony KDL-40W900A Service Manual

Troubleshooting
3-5. No Picture
3-5-18. NO PICTURE: (Except HFR Model)
No Picture
Is blue picture Is blue picture
on display?
(Factory SW
is booted)
・
Yes Yes
B*-Board is OK.
Check:
Tuner - No Picture
HDMI - No Picture
Ext. Video Input -
PANEL_VCC = +12V PANEL VCC +12V
LS(G*-Board): JL9102
LW (Adaptor): JL9301
Check Check
PANEL_VCC
No
at JIG LAND
on the B* Board
No No
G*-Board or
Adaptor NG
No Picture
BL ON (L or H) BL_ON (L or H)
LS (G*-Board): JL9111
LW (Adaptor): JL8205
BL_ON：H
Check
Yes
BL_ON at JIG LAND
on the B* Board
BL_ON：L
Symptom
Replace Harness
improvement
between G*-Board
to B*-Board.
(LS Only)
NG
NG
Change B*-Board
Symptom
improvement
B*-Board NG B Board NG
Replace
NG
LCD Panel
the LVDS FFC
(T-CON)
Harness
Symptom Symptom
improvement
LVDS FFC
Harness
Replace G*-Board to
B*-Board Harness
Change G*-Board
or Adaptor (LW)
Size Si B* B B* Board Type d T
OTHERS JP
40" BA2-S BA2-W
46" BA2-S BA2-W
55" BA2-S BA2-W
RB1G CHASSIS
W900A/904A/905A
G* Board G* B d
Type
G1A
G1A
G1B
200