LG CJS98F - No Booting in CD;Usb Function

3-6
ONE POINT REPAIR GUIDE
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.
3-2. CRYSTAL (X500)
3-2-1. Solution
Replace X500 on MAIN board.
3-2-2. How to troubleshoot (Countermeasure)
1) If 3.3 V & 1.2 V is normal, check reset ‘HIGH’ of IC501 pin T12 on MAIN board.
 If MAIN_RESET isn’t HIGH, check MICOM(IC100) pin40.
2) If MAIN_RESET is HIGH, check the soldering status of 24 MHz crystal(X500).
3) If the crystal(X500) doesn’t oscillate, check R551, R55E, C536, C53B around crystal(X500)
 If there’s no defective component, then replace X500.
3-2-3. Service hint (Any picture/ Remark)
XX
X
I
I
X
X
O
O
X500
< Signal waveform >
< MAIN board top view >
IC501
IC501
X500
X500