I've encountered a problem while replacing the AC transformer of a soundsystem composed by 3 loudspeakers (1 bass loudspeaker (4Ω5W) and a couple of highs(can't open to see the specs of these)) and a board which includes an amplifier (glued to a heatsink so I can't see its specs). The problem is that the broken transformer is a Chinese component without any relevant information that tells me its output voltage and I wasn't able to find anything on it on the Internet.

The transformer has a sticker that says exactly:

Model: JIL-802

Spec: E1-41x20.5

Input Voltage: AC 220V/50Hz-60Hz

NenYang (ShenZhen) Industrial Co., LTD.

I've only had some luck looking for E1-41x20.5 but nothing conclusive.

Anybody knows a similar transformer or how to get to know the output power? Or how to find out which voltage should the board receive? (there are capacitors with a 16V mark)

The transformer is broken and it won't give me an output current if I give it the input current, so I can't just measure the output current.

Thanks for reading and I can provide more details of the circuit board if needed!

Edit: I can measure the total resistance of the thing obtaining 5.8MΩ

  • 1
    \$\begingroup\$ How do you know it's broken? How many wires on the secondary? Does it have a secondary centre-tap? You need to show good debugging skills or the question will be closed as repair questions are off topic. See On-topic. \$\endgroup\$ – Transistor Apr 14 at 13:54
  • \$\begingroup\$ I know it's broken cause if I measure the primary's resistance I get nothing and it doesn't transmit any current to the secondary when plugged in. And no, it doesn't have a secondary center-tap. Sorry, I'm pretty new to this. \$\endgroup\$ – Guillermo Moreno Castaño Apr 14 at 14:00
  • \$\begingroup\$ Does it look or smell burnt? Is there any evidence of an internal thermal fuse? (The wires for these are often visible on the terminals - if there are terminals.) \$\endgroup\$ – Transistor Apr 14 at 14:01
  • \$\begingroup\$ Yes, the primary's plastic casing looks burnt and makes sense since it was broken due to an overvoltage in my electric installation. There are no terminals just 2 cables going in and 2 going out \$\endgroup\$ – Guillermo Moreno Castaño Apr 14 at 14:04
  • \$\begingroup\$ That may have killed your amplifer then. The transformer would have taken a few seconds to overheat. Meanwhile it would be putting out too high a voltage. \$\endgroup\$ – Transistor Apr 14 at 14:05

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