LG LHB976 Service Manual page 102

MAIN SET ONE POINT REPAIR GUIDE
When you turn on your set, it will display "PLEASE WAIT" on front panel, and it will not boot-up
normally.
1-3-7. IC502, IC503 (DDR3 MEMORY)
1-3-7-1. Solution
Replace IC502, IC503 on MAIN board.
1-3-7-2. How to troubleshoot (Countermeasure)
1) Please check 0.8 V of DDR3_CLK01.(between R591).
Please check 0.8 V of DDR3_CLK23.(between R587).
2) If it doesn't work even though IC101, IC151, IC153, IC150 are no problem,
IC502, IC503 (DDR memory) could have problem.
3) After changing it, if the set is still not booting:
- Check BCM7633 IC (IC500) refer to item 1-3-8.
- Check main board refer to item 1-3-9.
1-3-7-3. Service hint (Any picture / Remark)
IC500
< MAIN board top view >
IC503
IC502
< MAIN board bottom view >
2-87
R587
R591