LG SJ4Y Service Manual page 45

Wireless sound bar

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PROTECTION ERROR

No display or No Sound.

3-2. S(SHUT DOWN) PROTECTION

3-2-1. Solution

Replace MAIN board.

3-2-2. How to troubleshoot (Countermeasure)

1) Check PVDD voltage (25 V) of IC700, IC701 pin38, 37, 36.

- If PVDD voltage has 8.5 V under, refer to STEP 1-1.

2) Check GVDD, VDD voltage (12 V) of IC700, IC701 pin1, 2.

- If GVDD, VDD voltage has 8.5 V under, refer to STEP 1-1.

3) Check impedance (4 Ω) of speaker unit.

- If impedance of speaker unit has 1 Ω under, replace speaker unit.

4) If check point 1), 2), 3) is ok, replace MAIN board.

3-2-3. Service hint (Any picture / Remark)

ONE POINT REPAIR GUIDE

IC701

IC700

< MAIN board bottom view >

3-14

Only for training and service purposes.

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