3-5
ONE POINT REPAIR GUIDE
3. 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.
3-1. NO VCC33, VCC12
3-1-1. Solution
Please check and replace IC302, IC306 on MAIN board.
3-1-2. How to troubleshoot (Countermeasure)
1) Check voltage of IC306 pin5 & IC301 pin4 on MAIN board.
If IC306 pin5(about 3.4 V) doesn’t come out, check 3.4 VA from IC301.
If IC301 pin4(about 4.9 V) doesn’t come out, check +5.1 VA from SMPS.
2) If IC306 pin3(about 3.4 V) is normal, check the PWR_CTRL(IC306 pin4) is high(about 3.3 V)
If PWR_CTRL isn’t high, check pin D11 of IC501 & R550.
3) If PWR_CTRL is high, check R550 and if there’s no defective component then replace IC306.
4) If 3.3 V(VCC33) is normal, check 1.2 V output(pin3) voltage of IC302.
If 1.2 V of IC302 pin3 doesn’t come out, then replace IC302.
3-1-3. Service hint (Any picture/ Remark)
< MAIN board top view >
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