Table of Contents
Advertisement
4. 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.
4-1. NO VCC33, VCC12
4-1-1. Solution
Please check and replace IC505, IC509 on MAIN board.
4-1-2. How to troubleshoot (Countermeasure)
1) Check Voltage of IC505 pin2 on MAIN board.
If IC505 pin2(about 4.9 V) & D501 Input 5.6 VA doesn't come out, check 5.6 VA from SMPS board.
2) If IC505 pin2(about 4.9 V) is normal, check the PWR_CTRL(IC505 pin1) is high (about 3.3 V).
If PWR_CTRL isn't high, check pin63 of IC101 & R149,R503.
3) If PWR_CTRL is high, check R592, R593 and if there's no defective component then replace IC505.
4) If 3.3 V(VCC33) is normal, check output(pin2, 4) voltage of IC509.
If 1.2 V of IC509 pin2,4 doesn't come out, then replace IC509.
4-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
ONE POINT REPAIR GUIDE
IC505
D501
3-14
IC509
IC501
< MAIN board bottom view >
Advertisement
Table of Contents
