One Point Repair Instruction; All Bd Disc" Reading Error - LG BD630N Service Manual

ONE POINT REPAIR INSTRUCTION

1. "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.
1-1. Component
1) MD (Traverse Assembly)
2) IC701 – Adjustable LDO
1-2. How to troubleshoot (Countermeasure)
1) Check MD (Traverse, pick-up) first of all.
2) Check input/output voltage of LDO IC701 – (12 V, 9 V)
3) If output voltage is abnormal, check the periphery of IC701 and replace it.
4) Check the BD LD Control input/output.
If input signal (VRDC3O) is OK, but no output (BD_LD), check the TR Q702, Q706.
1-3. Service hint (Any picture / Remark)
INPUT
(FROM MAIN CHIP)
OUTPUT
(TO PICK-UP)
4-2