LG 22LG3DCH (CHASSIS:LA76A) Service Manual ▷ View online
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3. Digital TV Video
Check RF Cable
Check IIC Signal
TU400 #7, 8 Pin
Maybe Tuner(TU400) has problems
Check LGDT3304 Output
Clock(R404), Data(AR436,437),
Sync(R441)
Y
Y
N
Check Tuner 5V Power
IC701
Replace IC701
Y
N
Y
Maybe LGDT3304(IC400) has
problems
N
Maybe LGDT3304(IC400) has
problems
Check LD400 color
Bad Tuner. Replace Tuner.
None
red
4. Analog TV Video
Check RF Cable
Check CVBS signal
TU100 #16 Pin
Maybe Tuner(TU400) has problems
Y
N
Y
N
Y
Maybe FI-8668(IC506) has
problems
Check Tuner 5V Power
IC701
Replace IC701
Check IIC Signal
TU400 #7, 8 Pin
Maybe Tuner(TU400) has problems
N
Y
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5. AV Video
Check signal format
Is it supported?
Check signal
Rear – R612 (Composite)
Replace it.
Y
N
Check JK600 (Rear)
Replace connector
Y
N
Y
Check AV Cable / S-Video Cable
Y
Maybe LGE1854C(IC100) has problems
6. HDMI Video
Check signal format
Is it supported?
Y
Check JK800
Replace connector
Y
N
Y
Check HDMI Cable
Check EDID NVRAM (IC800)
Power #8 & I2C Signal (#5, #6)
Replace it or redownload
Y
N
Check Clock Signal
R815,R816
Replace it
Y
N
Maybe LGE1854C(IC100) has
problems
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7. All Source Audio
Make sure you can’t hear any audio
Check 12S Signal
DATA,CLK,L/RCLK
Check IC402 Power 1.8V,3.3V_PRO, 16V
L516,R505,R508
Replace FB
Y
N
Replace it
N
Check Connector
P1200
Y
Y
Replace connector
N
Check speaker
Y
Replace speaker
N
Maybe NTP3000A has problems. Replace it
Y
8. Digital TV Audio
Check video output
Follow procedure All source audio trouble
shooting
Y
Follow procedure digital TV video
trouble shooting
N
N
Maybe NTP3000A internal audio
DSP has problems. Replace it
9. Analog TV Audio
Check video output
Follow procedure All source audio trouble
shooting
Y
Follow procedure analog TV video
trouble shooting
N
N
Maybe NTP3000A audio block has
problems. Replace it
Check L516 voltage level 16V
Replace it
N
Y
Check I2S signal
Replace it
N
Y
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11. DVI Audio
10. Pillow Speaker
Check video output
Y
Follow procedure external
input video trouble
shooting
N
Check Connector
JK600(AV Rear)
Replace connector
N
Y
Check signal
R613,R614(AV Rear)
Replace it
N
Y
Check Q711 power voltage level 16V
Replace it
N
Y
Maybe NTP3000A has problems
Check main spk output
Follow proc edure All sourc e audio trouble
shooting
Y
Fo llo w p ro c ed ure aud io t ro ub le
s ho o t i ng
N
N
Mayb e NTP3000A aud io b lo c k has
p ro b lem s. Rep lac e it
Chec k IC1204
Rep lac e i t
N
Y
Chec k SW1200
Rep lac e i t
N
Y
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