LG 42SL85-UA (CHASSIS:LA92M) Service Manual ▷ View online
SL80/SL85 AUDIO PATH
D-sub RGB
HDMI 1
Side AV
CVBS, L/R
Digital Audio (Optic)
Digital AMP
NTP3100L
RS-232C (Ctrl./SVC)
I2S
RGB/H/V
Half-NIM T
uner
MAX3232
Saturn6
Saturn6
(ATSC US)
(ATSC US)
LGE3369A
LGE3369A
MPEG2
Linux
Scaler
IF +/-
SIF
TU_CVBS
Reset / IF_AGC …
SDA/SCL_5V
HDMI4
Audio L/R
Audio L/R (for RGB)
HDMI 2
SPDIF
RX/TX
RX/TX
JACK PACK
JACK PACK
at REAR
at REAR
JACK PACK
JACK PACK
at SIDE
at SIDE
TR Buffer
VSB/QAM
Demod.
LGDT3305
TS In[0…7]
TS_clk, SOP, Val
EEPROM
AV
Component 1
Y Pb Pr, L/R
CVBS, Y/C, L/R
Component 2
Y Pb Pr, L/R
USB2.0
SCL, SDA_3.3V
DP/D
M
M
O.C. Protector
+5V
+5V
HDMI 3
HDMI S/W
TDA9996
X-tal
25MHz
SL80/SL85 Trouble shooting guide – TV/CATV
Check TU500 Pin16(SIF)
Can you see the normal signal?
Can you see the normal signal?
Check the input (Pin W2) of LGE3369((IC601).
Measure waveform at C643 because it’s more easy to check.
Can you see the normal waveform?
Measure waveform at C643 because it’s more easy to check.
Can you see the normal waveform?
YES
NO
Could you measure voltage of TU500 & IIC lines?
Are they all normal?
Are they all normal?
NO
You should check power line
& IIC lines.
& IIC lines.
YES
You should replace TUNER.
NO
After checking audio signal line, you should decide to replace item or not.
Audio(In)
LA92B-SL80/SL85 Trouble shooting guide – AV/Component/RGB-PC
Audio(In)
Check JK100, JK101, JK102, JK103 on main PCB and JK101
on Side AV PCB Can you see the normal waveform?
on Side AV PCB Can you see the normal waveform?
NO
JK100, JK101, JK102, JK103 on main PCB and JK101 on Side AV PCB
may have problem. Replace this Jack.
Check the input (PinAA3,Y1,AE1,AF3,AE3,AE2,AA1
AB1,AB2,AC2,AB3,AC3) of LGE3369(IC601).
Can you see the normal waveform?
AB1,AB2,AC2,AB3,AC3) of LGE3369(IC601).
Can you see the normal waveform?
NO
YES
After checking audio signal line, you should decide to replace item or not.
YES
Check the Output (Pin Audio_MASTER_CLK ,MS_LRCK
MS_SCK,MS_LRCH) of LGE3369(IC601).
Can you see the normal waveform?
MS_SCK,MS_LRCH) of LGE3369(IC601).
Can you see the normal waveform?
NO
After checking audio signal line, you should decide to replace item or not.
Check IC301(NTP-3100L) L304/L305
YES
NO
After checking audio signal line, you should decide to replace item or not.
LA92B-SL80/SL85 Trouble shooting guide – HDMI
Audio(In)
Check input connect JK200,JK201,JK202,JK203
Can you see the normal waveform?
Can you see the normal waveform?
JK200,JK201,JK202,JK203 may have problem. Replace this Jack.
After checking the Power of this chip, you should decide to replace this or not.
After checking the Power of this chip, you should decide to replace this or not.
YES
YES
YES
NO
NO
NO
NO
After checking the Power & Select Pin & Etc of this chip,
you should decide to replace this or not.
you should decide to replace this or not.
Check DDC communication lines
(IC200)
(IC200)
Check the output of TDA9996HL(IC200)
_HDMI1,2,3
_HDMI1,2,3
or HDMI4.
.
Can you see the normal waveform?
Check HDCP communication lines(IC105)
YES
Check the Output (Pin Audio_MASTER_CLK ,MS_LRCK
MS_SCK,MS_LRCH) of LGE3369(IC601).
Can you see the normal waveform?
MS_SCK,MS_LRCH) of LGE3369(IC601).
Can you see the normal waveform?
Check IC301(NTP-3100L) L304/L305
YES
NO
After checking the Power & Select Pin & Etc of this chip,
you should decide to replace this or not.
you should decide to replace this or not.
NO
After checking the Power & Select Pin & Etc of this chip,
you should decide to replace this or not.
you should decide to replace this or not.
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