SABA 9250 no FM reception.

Divu · 30. September 2020, 20:47

Photos with the two traces repaired

Divu · 30. September 2020, 20:50

dl2jas
Thank you very much. I have managed to upload the photos!

oldiefan · 30. September 2020, 21:28

Hello Divu,

You have not correctly repaired the cracks.

Never try to repair a crack by just putting solder over it! The crack will then propagate again through the solder, because the solder lacks elasticity. But the crack propagated through the solder is then so thin that one would have great difficulty to see it. Nevertheless, on your photograph, I think I can even see it in one of the "repaired" tracks. When repairing a crack in a printed wiring, always first remove the green laquer from the printed wiring at both sides of the crack to a distance of about 1 cm to each side and then solder a solid copper or silver-coated copper wire onto the printed wire over the crack. Or you may connect two solder pins, one at each side of the crack, with an insulated wire. The last method is the most easy and most appropriate in your case here.

regards
Reinhard

Divu · 1. Oktober 2020, 02:51

oldiefan
I have removed all the paint and lacquer from the traces. After cleaning with isopropiol 99%. Below what is seen, there are about 5 strands of wire between the legs of neighboring components, in every trace. Look carefully. It is not the first time when I fix traces. If you have not noticed, it means that I have done a good job.

Divu · 1. Oktober 2020, 02:55

Another angle.

oldiefan · 1. Oktober 2020, 17:16

Not sure.

regards,
Reinhard

Divu · 2. Oktober 2020, 03:05

Sure. The photos taken with the phone. The wire exist in the two traces along to entire red line.

Divu · 2. Oktober 2020, 03:10

Different angle

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