LG 26LC7D / 26LC55 (CHASSIS:LD73A) Service Manual ▷ View online
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(5) In case of an unusual display in Component, RGB mode
(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
Are the R,G,B input and H,V
Sync of the J1100 normal?
Check the input source
No
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
Yes
Same as Block A
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6. 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
All input(modes) have
no sound?
Only HDMI has No
Sound?
No
Yes
Download
the EDID data
Check the signal after
CAX2069 refer to circuit diagram
No
Only specific input
(except HDMI,DTV,RF)
has no sound?
Check the signal before
CAX2069 refer to circuit diagram
No
YES
YES
Only RF has no
sound?
Check
the Tuner IN/OUT
No
YES
YES
Only AV/component/PC
input has no sound?
Is the output of
CXA2069 normal?
No
YES
IC1300 operates
normally?
Replace the IC1300
(MSP4450)
No
IC1301 operates
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
- 24 -
200
201
532
531
530
120
590
591
202
581
204
203
205
601
600
430
402
401
403
150
580
520
400
210
521
300
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