LG NP8540 Service Manual page 34

IF NOT BOOTING WHEN YOU TURN ON THE SET.
3-7. X501 (Crystal)
3-7-1. Solution
Replace X501 on main board.
3-7-2. How to troubleshoot (Countermeasure)
1) Check the frequency of 27 MHz crystal(X501).
2) If 3.3 V is abnormal, follow the stage 3-2-2 at the previous page.
3) If the crystal doesn't oscillate, replace X501.
3-7-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
X501 X501
< Main board top view >
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