| Electronics > Repair |
| Siglent SDS1202x-E fried FAN driver transistor - SOLVED - |
| << < (6/6) |
| tppc:
Hi everyone, My SDS1202x-E is up and running again! 8) While disconnecting the 12 pins power supply connector, I broke the SMD capacitor C176. There was no visible damage, but in fact, it was actually shorted. This did pull the stand-by power from 5V down to 1.25V (reference voltage of the 1117 LDO voltage regulator U17). Thus preventing the mainboard to start. I replaced C176 since there was no marking, I chose a 10 µF MLCC SMD 1206 I happend to have in stock. The scope starts nicely and the fan spins at its normal speed. Damned, I though I had a valid reason to upgrade to the new SDS824X HD oscilloscope :palm: Not this time Marco, not this time! :-// Thanks to all contributors who helped me in any way. |
| CharlotteSwiss:
Okay. But have you replaced Q34? With what? |
| tppc:
Yes, I did replace Q34 with a 2N7002 (SOT23 SMD) MOSFET I had in stock. I know, 2N7002 caracteristics are not even close to those of SPN3402. However, it does the job (temporarily). I ordered a kit of 40 SPN340x MOSFETS. |
| CharlotteSwiss:
Ok, so long live the 1202X-E |
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