3-12
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
R217
R223
R235
TP301
TP302
C220
608
TP304
C225
R5D9
C228
TP310
TP311
TP312
TP313
C236
TP511
C5B3
D201
ZD503
C270
C272
L301
L309
IC207
L311
L315
L513
L320
R305
R306
R307
R308
R309
R312
R313
R318
R519
R5D14
R521
R5D19
C301
C302
C305
C306
C307
C308
C309
C310
C311
C312
C2A3
C313
C2A4
C314
C317
C318
R5B
R5B55
C2B2
C324
C344
C346
7
TP20
TP21
IC301
IC505
< MAIN board bottom view >
IC301
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the TUNER function, repair the set according to the following guide.
5-3. TUNER FUNCTION
5-3-1. Solution
Replace MAIN board.
5-3-2. How to troubleshoot (Countermeasure)
1) Check if TUNER_LR is entered from pin13, 14 of IC302 to IC301(pin27, 28)
If no signals, check AVCC_3.3V for tuner power.
Check if the tuner control signals (CLK, DAT, CE, RST, SLT) are entered from IC501 to IC302.
If it doesn’t work, replace IC302 with a new one.
2) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC501 to IC201.
3) Check if ADC_DATA is entered from IC301 to IC501.
If no signal, check AVCC_3.3V & DVCC_3.3V (ADC) for IC301. If is NG, replace it with a new one.
4) Check the following I2S audio signal flow from IC501 to IC601. (Refer to Item 6-2.)
If there is any trouble, check the power for each IC.
The power is normal but, if the signal waveform to the IC is distorted or no signal,
replace it with a new one.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide on Item 6-1.
If AMP is damaged, replace it with a new one.
5-3-3. Service hint (Any picture/ Remark)
< TUNER function signal fl ow >
To Next Page
Loading...
