LG MCV1306 - Page 54

3-27
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the TUNER FUNCTION, repair the set according to the
following guide.
5-7. IN THE TUNER FUNCTION
5-7-1. Solution
Please check and replace IC202, TU101 on MAIN board.
5-7-2. How to troubleshoot (Countermeasure)
1) Check if TUNER_LR is entered from Pin1 & 3 of T1U01 to IC202(Pin23, 24).
 If no signals, Check +3.3 V for Tuner power.
 Check if the Tuner control signals (CLK, DAT, CE, RST, GPO2) are entered from IC101 to TU101.
If it doesn’t work, replace TUNER with a new one.
2) Check if ADC_BCK, ADC_LRCK, & DAC_MCLK are entered from IC501 to IC202.
3) Check if ADC_DATA is entered from IC202 to IC501.
 If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.
4) Check the following I2S audio signal flow from IC501 to IC602. (Refer to Item 5-1.)
 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 5-2.
 If AMP is damaged, replace it with a new one.
5-7-3. Service hint (Any picture / Remark)
kRGGGXXGGju]WY
h| sGGyYWY
{|ulyyG
GY[
hkjijrGGyYX]
h kj kh{hGGGyYX\
hkjsyjrGGyYX`
hkjtjsrGGyYYX
pjYWY
{|ulysG
GYZ
{T
IC501
MLC9800
IC602
PS9850
PWM
IC801
FS502B
BEAT BOX
AMP IC
TAS5631
DAC_BCK
DAC_LRCK
IC202
CS5346
DAC_DATA DAC_MCLK
TUNER
ADC_DATADAC_MCLK
TUNER_L/R
BEAT_DATA
< Signal check point >
< TUNER function signal fl ow >