Unbox and repair of a Yihua 853A pre-heater, use to work on SM electrolytic capacitors. 

I used to work repairing cell phones and laptops, so I used everyday the hot air gun. 1-You have to set carefully the air flow 2-never let it fixed pointing to a part of the board , that's when components start flying . 3-The trick is moving constantly the gun in circles around the component you want to remove . Add flux if needed. 4-To install/ solder components , I prefer using a fine soldering iron, it won't look as good as factory ,but electrons only care about solid connections. Try those steps on a scrap board and you will love your hot air gun.

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Interesting device! I can see why you are using the tweezers rather than a hot air rework device. I have not yet gotten myself into the world of SMD soldering, but one day it will have to happen...

I have never really had a problem of blowing components of the board. If that is the case, the airflow is probably set up too high. Even with high airflow, if you want to solder a component hold it down with tweezers whilst using air, and even with relatively high airflow, the surface tension of the solder keeps the components in place once its melted. Only real downside of hot air are groundplanes (which a preheater works wonders with) and plastic connectors and the like. For plastic connectors I either solder them last with a regular soldering iron, or use kepton tape as a heatshield.

In my view the problem with hot air is not blowing components off but heating everything around and potentially melting plastic connectors and such

Received Yihua 853A at yesterday. Turned out heating element in mine was also skewed, through not that drastically. And case bottom was undamaged. However "cloth" at bottom of heating element base was too small and in uneven thickness. Made it more or less evenly laid with tweezers. Otherwise not much other issues. Except noticed that heating element have contact with case at bottom through standoffs and top grate. Due to that during use case warmed up bit too. Not catactrophical, but it is a nuisance. Seems that for capactor, inductor and small IC soldering this preheater is OK. Soldering something like laptop CPU and GPU though seems is not an option. I have those Yihua 938D SMD tweezers too. Tips doesn't fit together at all. And separate heater with very thin ends cause various issues - either with solder flow or tips are simply too cold to be useful. I don't use them anymore.

My first car was an Austin Allegro. :D

Have you tried kapton tape over nearby components and plastic connectors?

That is horrible - new out of the box, & it has problems! Do you have a video on the 853AAA station?🤔 Thanks

You need to turn on the heater way higher to reach your desire temperature on the board.

The method I use is to cut the capacitor close to the base with side cutters, this just leaves the two pins to be desoldered from the board.

Just use heat resistant tape to cover sensitive pieces of components.

That was a shame that the heater came damaged, lucky that a bit of jiggling and some off camera swearing fixed it :-D When you said it was my viewers fault by getting in the way, i started jibbering like Stan Laural lol. I did wonder if a clothes iron upside down would get hot enough, well who needs smooth shirts :-D. I think a hot air gun would work with a very narrow diameter nozzel and low speed air. What's wrong with the tweezers?, they work :-D

Kapton tape or aluminum tape will protect small parts.

Would be curious how you rate the Chinese preheated? Also pending on the value of the capacitors why not replace the electrolitics you remove with ceramic 0805 or 1206, more reliable lower ESR.

Excuse me, the components on the other side, did they fall off while desoldering the ones on the top?

What are those swabs called? You should check out youtuber Northridgefix microscrope setup. He uses 2D microscope + camera + large LCD display. No neck strains. 12voltvids would have just cut the smd components and replace them with thru-holes. if it works, it works.

How do you feel about the twist off the caps with pliers method?

hi dod you know what difference between YIHUA 853 to YIHUA 853a to YIHUA 853b ? thanks yossi

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