LG BH5140S Service Manual page 51

2. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR
"PLEASE WAIT" ON FRONT PANEL
When you turn on your set, it will "PLEASE WAIT" display on front panel, and it will not boot-up
normally.
2-8. IC501 (MPEG IC)
2-8-1. Solution
Replace IC501 on MAIN board.
2-8-2. How to troubleshoot (Countermeasure)
1) Please check 1.2 V.
Please check 3.3 V.
Please check 1.5 V.
Please check RESET# (IC101 pin73).
2) If it doesn't work even though 1.2 V / 1.5 V / 3.3 V power and RESET# are no problem, IC501 MT8560
could have problem.
3) If RESET# isn't high, you may need to replace IC101.
4) After changing it, if the set is still no booting, check MAIN board refer to item 2-9.
2-8-3. Service hint (Any picture / Remark)
IC501
< Main board bottom view >
ONE POINT REPAIR GUIDE
2-36
IC101
R134
RESET#
< Main board top view >