LG 26LB75 / 26LB76 (CHASSIS:LD73C) Service Manual ▷ View online
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(6) In case of an unusual display in HDMI mode
(7) In case of an unusual display in SCART1 mode
(8) In case of an unusual display in SCART2 mode
Is the HDMI002(IC1004)
normal?
Yes
Same as Block A.
Are Input voltage, IIC Communication
and HV sync normal?
No
Is the Video input of the
A/V Jack(J1200) normal?
Yes
Same as Block A.
Check the input source.
No
Replace the IC.
No
Is the Video input of the
A/V Jack(J1201) normal?
Yes
Same as Block A.
Check the input source.
No
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5. In case of no sound
(1) Symptom
1) LED is Green.
2) Screen display appears but there is no sound.
2) Screen display appears but there is no sound.
(2) Procedure check
Is there no sound for
All input(modes)?
Is there no sound
only for HDMI?
No
Yes
Download
the EDID data
Check the signal after
CAX2069 refer to circuit diagram
No
Is ther no sound only
for specific input?
(except HDMI,DTV,RF)
Check the signal before
CAX2069 refer to circuit diagram
No
YES
YES
Is there no sound
only for RF?
Check
the Tuner IN/OUT
No
YES
YES
Is there no sound only
for AV/component/PC
input?
Is the output of
CXA2069 normal?
No
YES
Is the IC1300
operating normally?
Replace the IC1300
(MSP4450)
No
Is the IC1301
operating normally?
Replace the IC1300
(STA335BW)
No
YES
Replace the VSC B/D
YES
No
Replace the CXA2069.
Is the speaker on?
Set on speaker on in
menu.
No
Is the speaker Cable
normal?
Check the Speaker
Cable.
No
Yes
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BLOCK DIAGRAM
Synthesis
- 20 -
300
200
801
802
804
803
805
806
550
900
910
601
600
520
580
820
400
532
531
530
120
590
591
701
700
EXPLODED VIEW
A21
A2
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