LG 42LC43 (CHASSIS:LP78A) Service Manual ▷ View online
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15. HDMI mode
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
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HDMI
BLOCK DIAGRAM
MEMO
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EXPLODED VIEW
300
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