LG 55SL8500-ZA (CHASSIS:LD91K) Service Manual ▷ View online
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14. HDMI 1~4 All No Video Problem
Check Signal format
Is it supported?
Check the HDMI Cable
YES
YES
Replace MAIN B’D IC 100
Check the ADJUST MENU
EDID OK ?
YES
Download EDID
(Refer to Adjustment Spec)
NO
NO
Replace
MAIN B’D IC601 (HDCP KEY)
15. HDMI 1 or 2 or 3 or 4 All Video Problem
Check Signal format
Is it supported?
Check the HDMI Cable
YES
YES
Replace IC100
MAIN B’D IC600
MAIN B’D JACK Check
J600 -> HDMI1
J601 -> HDMI2
J602 -> HDMI3
J601 -> HDMI2
J602 -> HDMI3
YES
* This case is that HDMI Video doesn't display at the some HDMI input, not all.
Check Signal format
Is it supported?
Check the HDMI Cable
YES
YES
Replace IC100
MAIN B’D JACK Check
J603 -> HDMI4
YES
YES
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16. All Source no Audio Problem
Check The Speaker
Check Speaker Cable
YES
Check P700 Cable
YES
NO
Replace MAIN B’D IC 701
YES
MAIN B’D
L705 Pin #1
L704 Pin #2
L704 Pin #2
PWM Signal ?
Replace Speaker
NO
Replace Speaker Cable
NO
* If headphone is connected,
Speaker sound doesn't work.
Speaker sound doesn't work.
Replace MAIN B’D IC803
NO
YES
MAIN B’D
L700 = 1.8V
MAIN B’D
Check R722, R720, R721
Signal
YES
Replace MAIN B’D IC100
NO
Replace MAIN B’D IC701
NO
17. Digital TV No Audio Problem
Digital TV Video OK ?
YES
Replace MAIN B’D IC 100
18. Analog TV No Audio Problem
MAIN B’ D R1216 Signal (SIF)
Replace MAIN B’D IC1200
NO
Analog TV Video OK ?
YES
Check MAIN B’D
C231 Signal (SIF)
NO
Replace MAIN B’D IC 100
YES
YES
MAIN B’ D C1269 Signal (SIF)
Replace MAIN B’D IC1203
NO
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19. AV1 No Audio Problem
Check the SCART Cable
YES
Check MAIN B’ D
C229, C230
MAIN B’ D
C229 (Right Sound)
C230 (Left Sound)
signal ?
YES
NO
Replace MAIN B’ D IC 100
AV1 Video OK ?
YES
Check MAIN B’ D JK1100
Replace MAIN B’ D JK1100
NO
YES
20. AV2 No Audio Problem
Check the SCART Cable
YES
Check MAIN B’ D
C2008, C2009
MAIN B’D
C2008 (Right Sound)
C2009 (Left Sound)
signal ?
YES
NO
Replace MAIN B’D IC 100
AV2 Video OK ?
YES
Check MAIN B’ D JK1101
Replace MAIN B’D JK1101
NO
YES
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21. AV3 No Audio Problem
Check the RCA Cable
YES
Check MAIN B’D
C2011, C2012
MAIN B’D
C2011 (Right Sound)
C2012 (Left Sound)
signal ?
YES
NO
Replace MAIN B’D IC 100
AV2 Video OK ?
YES
Check MAIN B’D P402
Replace MAIN B’D P402
NO
YES
22. Component No Audio Problem
Check the Component Cable
YES
Check MAIN B’D
C2013, C2014
MAIN B’D
C2013 (Right Sound)
C2014 (Left Sound)
signal ?
YES
NO
Replace MAIN B’D IC 100
Component Video OK ?
YES
Check MAIN B’D JK400
Replace MAIN B’D JK400
NO
YES
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