Read LG 50PB4RT-MA (CHASSIS:PP78B) Service Manual online
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No
Is normal only video ?
Is normal only audio?
Check TMDS line wave.
(R1215 ~ R1222/ R1226 ~ R1233)
Download EDID data each port.
1. Check TV input mode.
(HDMI1 port support HDMI and DVI.
So if you input DVI signal and PC audio from phone jack,
You can hear PC audio. )
2. Unplug and plug HDMI cable.
(sometimes ESD surge occurred at HDMI port.)
3. Check HDMI Mute register. (0x68, offset 0x37)
4. Check Audio-out channel mute register (0x68, offset 0x32)
is appropriately enabled.
Check HDMI source. Change another source or cable.
Is wave continuous?
1. Check HDMI receiver’s status register. (0x60, offset 0x06)
- If the value is 0xf or 0x8, it is normal.
2. Check HDCP register. (0x60, offset 0x32)
- Enable bit 6: HDCP key loaded
- Enable bit 5: HDCP decryption active
- Enable bit 4: HDCP authen. attempted
No
No
Replace IC1200
Reset TMDS power down/on register.
- 0x60, offset 0x3f : 0xf7 => 0xff
Yes
Yes
Normal video,
Normal audio?
Yes
No
19. HDMI mode
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