3-6
ONE POINT REPAIR GUIDE
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 DVCC_3.3V, 1.2 VA
4-1-1. Solution
Please check and replace IC202, IC205 on MAIN board.
4-1-2. How to troubleshoot (Countermeasure)
1) Check Voltage of IC202 pin3 on MAIN board.
If IC202 pin3 (about 5.1 V) & pin1 Input 12 VA doesn’t come out, check +12 VA from SMPS board.
2) If IC202 pin3 (about 5.1 V) is normal, check voltage of IC205 pin3 (about 1.2 VA), pin6 (about 3.3 VA).
If IC205 pin3 (about 1.2 VA), pin6 (about 3.3 VA) doesn’t come out, check R253, R254, R256 and R260, R261, R262.
If there’s no defective component then replace IC205.
3) PWR_CTRL is high, check R512 and if there’s no defective component then replace IC505.
PWR_CTRL (IC505 pin3) is high (about 3.2 V)
If PWR_CTRL isn’t high, check pin D11 of IC501 & R512, R513
4) If PWR_CTRL is high, check R559 and if there’s no defective component then replace IC505.
4-1-3. Service hint (Any picture/ Remark)
< MAIN board top view >
< MAIN board bottom view >
IC505
IC505
IC202
IC202
IC205
IC205
Summary of Contents for OM7560
Page 13: ...1 12 ...
Page 19: ...2 8 ...
Page 53: ...3 34 2 SDRAM IC502 Fig 2 SDRAM 7 6 8 5 8 6 7 5 ...
Page 66: ...3 77 3 78 2 MAIN P C BOARD TOP VIEW ...
Page 67: ...3 79 3 80 MAIN P C BOARD BOTTOM VIEW ...
Page 68: ...3 81 3 82 3 TOP FRONT P C BOARD TOP VIEW ...