LG 50PT81-ZB (CHASSIS:PP7BA) Service Manual ▷ View online
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19. HDMI mode
Is only video
normal?
Is only audio
normal?
No
Yes
Download EDID data each port.
Check the TMDS line wave.
(R1215~R1222 / R1226~R1233)
(R1215~R1222 / R1226~R1233)
1. Check the HDMI receiver’s status register. (0x60, offset 0x06)
- If the value is 0xf or 0x8, it is normal.
2. Check the HDCP register. (0x6, offset 0x32)
- Enable bit 6 : HDCP key loaded
- Enable bit 5 : HDCP decryption active
- Enable bit 4 : HDCP authentication attempted
- Enable bit 5 : HDCP decryption active
- Enable bit 4 : HDCP authentication attempted
Reset TMDS power down/ on register.
- 0x60, offset 0x3f : 0xf7 => 0xff
- 0x60, offset 0x3f : 0xf7 => 0xff
Check HDMI source.
Change to another source or cable.
Change to another source or cable.
Yes
Is the wave
continuous?
Normal video,
Normal audio?
No
Yes
Replace the IC1200.
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. Unplug and plug in the HDMI cable.
(sometimes ESD surge occurred at HDMI port.)
3. Check the HDMI Mute register. (0x68, offset 0x37)
4. Check the Audio-out channel mute register (0x68,
4. Check the Audio-out channel mute register (0x68,
offset 0x32) is appropriately enabled.
Yes
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BLOCK DIAGRAM
MEMO
- 27 -
- 28 -
EXPLODED VIEW
590
901
900
121
570
310
560
120
601
602
603
501
520
550
301
300
302
303
600
304
305
306
400
A21
A2
502
202
203
240
204
205
206
250
208
580
207
201
200
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