Service manual

Page 21 of 64
4-2-5 Graphic-Block
YPbPr,RGB,DVI
Mode no display
Check power switch is in
“Power ON” status, and check
DC POWER block.
Disconnect the signal cable. Is the
screen show “Searching”?
Connect the signal cable
Connect the signal cable
again, check LED status.
1.YPbPr,RGB mode:
Measure the Y, Pb, Pr, R,
G, B,H,V input at U13.
2.DVI mode:
Measure DVI input at
U15.
Check the wire from J34 is
tight enough? Check the panel
side too.
Check relevant circuit whether
have short or open, and check the
signal cable whether normal.
Check the SCALAR and
LVDS circuit.
OK
Chcek the DC POWER circuit.
No, nothing is shown.
LED Orange
OK
Yes, there are have OSD show
OK
NG
OK
NG
NOTE：The LED color and model name table:
LED COLOR Model Name
P5U3SSCNTGA12(TAIWAN)
P5U3SSCNDGKAD(KONKA)
P5U3SSCNDGA1D(CHINA AOC)
P5U3SSCNDGA3D(CHINA AOC)
Orange/Blue(ø3mm)
P5U3SSCNDGA4D(CHINA AOC)
Red/Blue(ø5mm) P4V6SGCNDBKAD(KONKA)
P4X3TSCNLCACD(Australia)
P5U3SSCNDGCHID(ChangHong)
Red/Green(ø5mm)
P5U3SSCNLGA1D(Australia)
Press power key. If the
LED color is still red,
replace U100 or U101.
LED Red or no response.