LG 37LC43 (CHASSIS:LP78A) Service Manual ▷ View online
15. HDMI mode
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In only video
normal?
In only audio
normal?
No
Yes
Download EDID data each port.
Check TMDS line wave.
(R312~E3273)
(R312~E3273)
1. Check HDMI receiver’s status register. (0x60, offset 0x66)
- If the value is 0xf or 0x8, it is normal.
2. Check HDCP register. (0x6, offset 0x32)
- Enable bit 6 : HDCP key loaded
- Enable bit 5 : HDCP decryption active
- Enable bit 4 : HDCP authen. attempted
- Enable bit 5 : HDCP decryption active
- Enable bit 4 : HDCP authen. attempted
Reset TMDS power down/ on register.
- 0x60, offset 0x3f => 0xff
- 0x60, offset 0x3f => 0xff
Check HDMI source.
Change another source or cable.
Change another source or cable.
Yes
R312~R327
Is wave
continuous?
Normal video,
Normal audio?
No
Yes
Replace IC303.
No
1. Check TV input mode.
(HDMI 1 port support HDMI and DVI.
So if you input DVI signal and PC audio from
phone jack, You can hear PC audio.)
So if you input DVI signal and PC audio from
phone jack, You can hear PC audio.)
2. Uuplug and plug HDMI cable.
(sometimes ESD surge occurred at HDMI
port.)
port.)
3. Check HDMI Mute registe. (0x68, offset 0x37)
4. Check Audio-out channel mute register (0x68,
4. Check Audio-out channel mute register (0x68,
offset 0x32) is appropriately enabled.
Yes
- 26 -
HDMI
BLOCK DIAGRAM
MEMO
- 27 -
LG Electronics. Inc. All right reserved.
- 28 -
EXPLODED VIEW
300
200
805
803
800
802
806
808
809
801
810
804
807
400
900
910
510
600
610
530
500
520
120
81
1
200T
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts
are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as recommended
in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
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