| Electronics > Repair |
| NOCO GB70 repair help |
| << < (3/10) > >> |
| AN86:
Now it dont even illuminate "!". But if i need 3.3v and i have 1.2 that drops to 0.7 in few sec then its definitely a problem. I add picture of the oder side of the board. I hope the number helps. It said veersion G, its blocked by the wire in the picture. |
| AN86:
MCU picture |
| jerryk:
C21 should be your decoupling capacitor to VDD and VSS. With all plugs removed can you check the resistance across C21. It should read around 4K. It should not read in the low ohms region. When you tested your relays did you disconnect all plugs? Jerry |
| AN86:
On C21 it reads 3.4 ohm. And continuity test is beeping. When tested relays i disconnect all plugs, didnt want to risk anything. How can i know the rating of this component? I believe its capacitor according to looks and C name on it. |
| jerryk:
Your MCU is most likely shorted as in failed. I don't recall the capacitance value of C21 but the symptoms here are not good. The LDO which is IC6 has a direct path from its output to pin24 on the MCU which is VDD. I doubt the short is at the capacitor but you would have to remove it to be sure. Jerry |
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