All Bd Disc" Reading Error - LG LHB976 Service Manual

2. "ALL BD DISC" READING ERROR

- All the Blu-ray disc is not operated, but DVD and CD are operated normally.
- If the LDO for APC of BD laser diode is abnormal, BD doesn't work.
- If the LD current control is abnormal, BD doesn't work.
2-1. Component
1) MD (Traverse Assembly)
2) SIC707 – Adjustable LDO
2-2. How to troubleshoot (Countermeasure)
1) Check MD (Traverse, pick-up) first of all
2) Check input/output voltage of LDO SIC707 – (12 V, 8.1 V)
3) If output voltage is abnormal, check the periphery of SIC707 and replace it.
4) Check the BD LD Control input/output.
If input signal (LTHR) is ok, but no output (LDI_BD), check the TR SQ714, SQ716
2-3. Service hint (Any picture / Remark)
INPUT
(FROM MAIN CHIP)
COMPONENT REPAIR GUIDE
OUTPUT(TO PICK -UP)
8 V
4-3
12V