3-15
ONE POINT REPAIR GUIDE
6. NO SOUND
There is no sound output by DIGITAL AUDIO AMP DAMAGE, repair the set according to the
following guide.
6-2. DIGITAL AUDIO AMP DAMAGE
6-2-1. Solution
Please check and replace IC701, IC702 on MAIN board.
6-2-2. How to troubleshoot (Countermeasure)
1) Check PWM_FL±, PWM_FR± & PWM_SW± signals from IC601 to IC701 & 702 each input function.
If no signal, check if I2S audio signals are entered to IC601.
Refer to “I2S audio signal interface” on Item 6-1-2.
2) Check PVDD.
If PVDD is abnormal, check the SMPS.
3) Check AMP_12V for driving the gate of AMP IC.
a. All the powers are normal, but if AMP_12V is low, there is possible for AMP IC to be damaged.
b. Remove L701, L702, L703 and L704 one by one.
When removed a inductance, if AMP_12V is recovered, the IC connected to it was damaged.
c. Replace the IC with a new one.
4) Check the impedance between IC701/ IC702_OUT_A/OUT_B & GND.
a. If the impedance is 0
Ω
, the IC must be damaged.
b. After removing the heat sink, replace it with a new one.
6-2-3. Service hint (Any picture/ Remark)
< MAIN board top view >
IC702
IC702
L703
L703
L701
L701
L702
L702
L704
L704
IC701
IC701
IC700
IC700
Summary of Contents for CM5660
Page 13: ...2 2 ...
Page 15: ......
Page 17: ...2 8 A60 3 SPEAKER SECTION ...
Page 51: ...3 34 2 SDRAM IC504 Fig 2 SDRAM 7 6 8 5 8 6 7 5 ...
Page 61: ...3 65 3 66 2 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...
Page 62: ...3 67 3 68 3 FRONT P C BOARD TOP VIEW BOTTOM VIEW ...
Page 63: ...3 69 3 70 4 JACK P C BOARD TOP VIEW BOTTOM VIEW ...