LG NP8340 - If Not Booting When You Turn on the Set (Ddr IC)

3-10
ONE POINT REPAIR GUIDE
9. IF NOT BOOTING WHEN YOU TURN ON THE SET.
9-1. IC503, IC504 (DDR IC)
9-1-1. Solution
Replace IC503, IC504 on MAIN board.
9-1-2. How to troubleshoot (Countermeasure)
1) Check 0.75 V of DDR3_VREF (Point 1).
If voltage is abnormal follow the stage 3-1 at the previous page.
2) Check 0.75 V of DDR3_VREF (Point 2).
If voltage is abnormal follow the stage 3-1 at the previous page.
3) Check 1.5 V of C5A5.
4) If 1.5 V and 0.75 V are abnormal, check the around parts (C5A5, C5A6, R555, R556).
5) If there’s no defective component, follow the stage 3-1 at the previous page.
6) When you followed above step but it doesn’t work, replace the IC503, IC504.
9-1-3. Service hint (Any picture / Remark)
< Main board bottom view > < Main board top view >
IC503
IC503
C5A5
C5A5
Point 1
Point 1
Point 2
Point 2
IC504
IC504