Si570 current

[Yury]

I have completed receiving part only. The receiver works 5-7 minutes and stops.
Investigation indicated strange behavior of Si570.
After switch on - the Si570 (U9) current 100 mA, in 20-30 sec it becomes 300 mA at once (as trigger). I picked up 3.3V legs 7 U11 and U10 to rest only U9.
The receiver works 5-7 minutes only. I think it is due overheating Si570.
I think I need to replace Si 570.
Has anybody other ideas?

[TerryFrench]

I do not have any technical help to offer here, but I built a Peaberry myself.
Basically, I'd check all soldering connections you have so far with a 10x magnifier (loupe) before thinking about replacing any part. It's surprising how well some parts support the various issues we have when we solder them. (I'm thinking about you PSOC).

[Yury]

I checked all soldering with magnifier and mechanical. I could not find mistakes. Additionally I disconnected U14 from 5V to avoid loading Si570. Si570 had contact only to U10 “SCL” and “SDA” points. However, these points are connected to 3.3V through 4.99 k (checked). It cannot give +200 mA.
I disconnected Si570 from 3.3V and resoldered removed points. Without Si570 I had steady current near 50 mA.

[AE9RB]

It doesn't sound right that a Si570 would fail in this way. It's more likely there's a solder bridge under the part or the alignment is poor. After a brief warm up a short is created from thermal expansion.

[Yury]

Si570 has been replaced now. Current and rcvr are OK.