Hdmi Mode - LG 42LB9R Service Manual

15. HDMI mode

In only video
normal?
No
In only audio
normal?
Check TMDS line wave.
(R312~E3273)
Is wave
continuous?
Yes
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
Reset TMDS power down/ on register.
- 0x60, offset 0x3f => 0xff
Yes
Download EDID data each port.
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.)
Yes
2. Uuplug and plug HDMI cable.
(sometimes ESD surge occurred at HDMI
port.)
3. Check HDMI Mute registe. (0x68, offset 0x37)
4. Check Audio-out channel mute register (0x68,
offset 0x32) is appropriately enabled.
No
Check HDMI source.
Change another source or cable.
Yes No
Normal video,
Normal audio?
- 24 -
Replace IC303.