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I got two used QDXs, one v3 and one v5. The v3 was assembled by the previous owner, the v5 supposedly from QRP labs. The v5 had a shorted USB and almost fried my computer and itself, but thankfully I got to it in time, the shorted soldering seemed "factory"
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Both are recognized on the computer and receive great, the v3 doesn't seem to transmit correctly though. The v5 seems to transmit ok although I have no way of knowing the exact output. All my tests are done on 40m since its the only band my antenna has low SWR, and just a bit on 20m where a little over 1.5.

My very unscientific method of measuring this since I don't own a SWR bridge or a power meter is leaving my RSP1a nearby without a connected antenna. The v5 shows as +10-20 on the RSP1a, while the v3 is much lower, something like a 6 S-units.

I also use BNC to SO-239 adapters and cables of dubious quality so those factors come in to play too. But it seems like the v3 is faulty in some way, probably that's the reason the previous owner got an assembled one too.

Any ideas where should i start? The solder joints and the toroids look acceptable. I haven't assembled one and have no experience with such kits, but I have a multimeter and can follow basic directions, perhaps reheat some solder points too.