Booting In Cd/Usb Function - LG CM9750 Service Manual

NO BOOTING IN CD/USB FUNCTION
After you turn on power key and displayed message in the following order (HELLO  VOL XX 
CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.
8-2. CRYSTAL (X500)
8-2-1. Solution
Replace X500 on MAIN board.
8-2-2. How to troubleshoot (Countermeasure)
1) If 3.3 V & 1.2 V is normal, Check the CHIP_RESET of IC501 pin T12 on MAIN board.
  If CHIP_RESET isn't high, Check MICOM(IC101) pin40.
2) If CHIP_RESET is high, Check the soldering status of 24 MHz crystal (X500).
3) If the crystal (X500) doesn't oscillate, Check R508, R509, C502, C503 around crystal (X500).
  If there's no defective component, then replace X500.
8-2-3. Service hint (Any picture / Remark)
< MAIN board top view >
ONE POINT REPAIR GUIDE
X500 X500
IC501 IC501
X X X I I
X X O O
< Signal waveform >
3-10
X500