I am repairing a Haier RF-5210-11 refrigerator power control board; found this damaged capacitor. The circuit board has a "RTC" designation on it at the capacitor location, and the capacitor itself is only labeled with 005 04. I cannot find any information on the specs for this capacitor so I can replace it. Any one have information on this capacitor?enter image description here

  • 2
    \$\begingroup\$ Are you sure its a capacitor and not a PTC, or NTC? Also, capacitors don't usually just explode on their own. Something else causes them to. \$\endgroup\$
    – DKNguyen
    Aug 5 '20 at 22:00
  • \$\begingroup\$ I agree with user @DKNguyen possibly it is a PTC and not RTC. Anyway, if you replace it it will probably blow again. \$\endgroup\$ Aug 5 '20 at 22:05
  • \$\begingroup\$ Maybe an NTC thermistor for surge elimination. If it was in series with the power, then probably that's it. But if it gave up the ghost probably some semiconductors have run down the curtain and joined the choir invisible. \$\endgroup\$ Aug 5 '20 at 22:37
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    \$\begingroup\$ These devices are like resettable fuses, so if they blow then something downstream shorted out, or a motor has a stuck rotor, etc. These devices only protect against high inrush currents, not short circuits. \$\endgroup\$
    – user105652
    Aug 6 '20 at 2:25
  • \$\begingroup\$ According to googling pictures of the said power supply, there is a green part designated RTC right at the mains input. It must be the inrush limiting NTC thermistor, not a capacitor. \$\endgroup\$
    – Justme
    Aug 6 '20 at 5:25

This part limits the inrush current to the input capacitors of a switching power supply. These capacitors draw large current when power is applied and will get warm due to power dissipation. When they fail they will leak and swell, forming a low resistance. The same value is commonly used in laptop power supplies.

Be sure to check for a bad MOV surge suppressor. These normally fail shorted but with replacing the fuse several times they have been known to read as a open.


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