LG 47SL85-UA (CHASSIS:LA92M) Service Manual ▷ View online
LA92B-SL80/SL85 Trouble shooting guide – Speaker
Audio(Out)
Check the output (Pin A8,B7,C7,D8) of LGE3369(IC601).
Measure waveform at R160,R161,R162,R163 because it’s more easy to check.
Can you see the normal signal?
Measure waveform at R160,R161,R162,R163 because it’s more easy to check.
Can you see the normal signal?
Check the input (Pin 7,17,18,19) of NTP3100((IC301).
Can you see the normal waveform?
Can you see the normal waveform?
YES
NO
NO
This board has big problem because Main chip(LGE3369) have some troubles.
After checking thoroughly all path once again,
You should decide to replace BCM3553 or not.
After checking thoroughly all path once again,
You should decide to replace BCM3553 or not.
After checking audio signal line, you should decide to replace item or not.
YES
NO
After checking the Power & I2C & Reset of this chip,
you should decide to replace this or not.
you should decide to replace this or not.
NO
YES
After checking audio signal line, you should decide to replace item or not.
Check the connector & Speaker
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
LA92B-SL80/SL85 Trouble shooting guide – SPDIF
Audio(Out)
Check the output (Pin E9) of LGE3369(IC601).
Measure waveform at R656 because it’s more easy to check.
Can you see the normal signal?
Measure waveform at R656 because it’s more easy to check.
Can you see the normal signal?
Check the input of JK104.
Can you see the normal waveform?
Can you see the normal waveform?
YES
NO
NO
This board has big problem because Main chip(LGE3369) have some troubles.
After checking thoroughly all path once again, You should decide to replace LGE3369 or not.
After checking thoroughly all path once again, You should decide to replace LGE3369 or not.
After checking audio signal line, you should decide to replace item or not.
YES
After checking the Jack, you should decide to replace item or not.
D-sub RGB
HDMI 1
Side AV
CVBS, L/R
DDR2 (1Gbit)
Qimonda / Hynix
NAND Flash
(256Mb)
Digital Audio (Optic)
Digital AMP
NTP3100L
RS-232C (Ctrl./SVC)
I2S
EEPROM
512Kb
RGB/H/V
Half-NIM T
uner
DDR_Data[0:15], DQS, DM …
Addr.[ ], ctrl. data
MAX3232
Saturn6
Saturn6
(ATSC US)
(ATSC US)
LGE3369A
LGE3369A
MPEG2
Linux
Scaler
Data [0 … 7]
IF +/-
SIF
TU_CVBS
Reset / IF_AGC …
SDA/SCL_5V
HDMI4
Addr[0…1], CS …
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
SCL, SDA_3.3V
TR Buffer
VSB/QAM
Demod.
LGDT3305
X-tal
Reset Switch
Reset IC
12MH
z
z
TS In[0…7]
TS_clk, SOP, Val
EEPROM
Data[16:31]
DDR2 (512Mbit)
Qimonda / Hynix
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
Bluetooth
Dongle
(Option)
DP/DM
DP/D
M
M
O.C. Protector
+5V
+5V
LCD Module
(FHD, 120Hz)
FRC IC
(LGE7329A)
DDR2(512)
Qimonda/Hynix
FRC Block
FRC Block
LVDS
LCD Module
(FHD, 60Hz)
Option
HDMI 3
HDMI S/W
TDA9996
DDR2(512)
Qimonda/Hynix
SPI Flash
(2Mb)
Serial boot Flash
(32Mb)
X-tal
12MHz
X-tal
25MHz
I2C Map
+3.3V
NTP3100L
IR(Eye-Q)
+5V_GENERAL
LGE7329A
(URSA)
LGDT3305
SDA_0, SCL_0
MEMC_SDA, MEMC_SCL
SDA_1, SCL_1
SDA_SUB/AMP, SCL_SUB/AMP
FE_DEMOD_SDA, FE_DEMOD_SCL
+5V_GENERAL
TUNER
FE_TUNER_SDA,
FE_TUNER_SCL
FE_TUNER_SCL
+5V_TU
OPTION
AT24C512
EEPROM_SDA,
EEPROM_SCL
EEPROM_SCL
+3.3V
LGE3369A
MLINK_SDA,
MLINK_SCL
MLINK_SCL
+5V_GENERAL
TDA9996
(HDMI S/W)
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