SNES Capacitors and Voltage Regulator Replacement

About 1 min

SNES Capacitors and Voltage Regulator Replacement

It is farily straight forward to replace the capacitors and voltage regulator if you have the right tools.

Tools needed

  • Hakko de-soldering gun (FR-301)
  • Solder

Parts you need to replace and the location on SNES jr.

Capacitor LocationuFV
C60220 uF6.3
C5910 uF16
C5810 uF16
C1733 uF50
C1633 uF50
C1547 uF16
C1433 uF50
C92.2 uF50
Voltage Regulator (2A)L78S05CV

Cap Kit/Regulator Cost - $4.87 (Feb 19, 2022

DescriptionPart NumberManufacturer NameQtyUnit PricePrice
CAP ALUM 220UF 20% 6.3V RADIAL6.3ZLH220MEFCTA5X11Rubycon10.37000$0.37
CAP ALUM 10UF 20% 16V RADIAL16TWL10MEFC5X11Rubycon20.42000$0.84
CAP ALUM 33UF 20% 50V RADIAL50YXJ33M5X11Rubycon30.47000$1.41
CAP ALUM 2.2UF 20% 50V RADIAL50YXJ2R2MTA5X11Rubycon10.42000$0.42
CAP ALUM 47UF 20% 16V RADIAL16YXF47MEFC5X11Rubycon10.34000$0.34
IC REG LINEAR 5V 2A TO220ABL78S05CVSTMicroelectronics11.49000$1.49


Cap Kit img

Original caps img

Replaced img

Check of voltage regulator needs to be replaced

Tools needed

  • Multimeter (Fluke)
  • -ve terminal with aligator clamp
  • +ve terminal with a needle probe

We are going to test the voltage regulator in circuit, while active. Therefore, it is important not to short anything while doing this test. Shorting can burn the fuse or fry the chips. Make sure the SNES switch is also not touching any parts of the board.

While the power is off

  • Use a aligator clamp to connect to a ground on the board. Connect the other end to the multimeter
  • Check the middle pin of the voltage regulator to check ground continuity

Turn the power on and turn on the SNES switch

  • Now that the ground pin is connected elsewhere there is no reason for shorts
  • Firmly use the needle +ve (red) probe and touch the
    • output of the Voltage Regulator. You should get a steady ~5V reading
    • input of the Voltage Regulator. You should get a steady ~10V reading

If the above is not the case, time to replace the Voltage Regulator. If everything is good, then there is no reason to replace anything.

Capacitor Replacement

Tools needed

  • ESR meter with two aligator probes

While in circuit, you can use the ESR meter to measure capacitance and resistance.

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