How do I remove the chip from the board

[harp]

After 30 minutes... my meal is done! (:

[Mr.Pc]

I always add soldering flux, leave the blower without the nozzle and use stronger air flow. Turn on the station, wait 1 minute to warm up better and then make circular movements around the IC. Use tweezers to check if the IC has come loose. Furthermore, you need to practice a lot until you improve your technique.

[gusto]

Can you confirm that a thin wire like 0.1mm go from one corner to another diagonaly, like red drawing. If you have trouble putting it after chip, drag it behind legs like green drawing and pull up it to straight. You can determine if on center has barier observing lenght of wire.

Sorry, I use google translator, but I don't understand what you wrote.

[gusto]

I always add soldering flux, leave the blower without the nozzle and use stronger air flow. Turn on the station, wait 1 minute to warm up better and then make circular movements around the IC. Use tweezers to check if the IC has come loose. Furthermore, you need to practice a lot until you improve your technique.

I soldered about 5-6 chips. Some were successfully unsoldered, others not.
I will try according to your instructions

[harp]

but I don't understand what you wrote. ?............... the 30 minute on high temperature is a lot so it is reasonable to be suspicious... I sugest you method to just be sure that that particular chip on board is not soldered or glued to pcb. Use a thin wire to see if it is freely go under ic.

[gusto]

Thanks, now I understand what you meant.
I desoldered the chip, but many things went wrong. Some copper roads are destroyed. I managed to partially fix it, but it wasn't perfect. I soldered a new chip today, but it turned out even worse.
I don't want to comment on that. I want to forget about it.

[CapLeaker]

I don't like it at all

I heat the chip with hot air and nothing happens. I set the temperature to 380°C and heated for 10 minutes. Then I increased the temperature to 400°C and heated for another 10 minutes. I don't see any solder melting. I increased the temperature to 420°C and nothing even after 10 minutes.

After 30 minutes I resigned.
Am I making a mistake somewhere?

I was already warned that the metal surface can be soldered to the board from below. However, I have bought new chips and there is no metal surface on the chip.

Specifically, it is a chip (see picture above) ADV 7623. It is an onkyo home theater page number. 13

I think you aren't using any low melt / quality solder and flux.

I cook a meal in my air fryer faster than 30 mins.

[gusto]

I return to the problem again

Here are the pieces that were swept away by the hot air.
I can't find out which output is number 1 on the stepdown converter, etc.
I want to solder the parts to their places

[kevingill]

You'll have to measure each component and check against the schematic to see which one goes where. The 8 leg components are probably resistor or inductor ladders and can be placed either way round.
You probably have too much air on your hot air workstation, or the temp isn't what you think it is.
I'd mask off the area first and always apply flux around the area to speed up the solder melt.

[gusto]

I mainly need to find out the terminals on the stepdown converters Q8102 and Q8103 (see picture).
Scheme page 13

[harp]

You are on the wrong track, check it, that 8 leg thing is not ic from schematic... probably resistor array if resistance between sides of each is the same, eg 4x1k... if is near zero - filter... may be fitted on anyway side. The components are enough large to mount it with soldering iron, to minimize temp stress to ic and pcb...

[harp]

On schematic R8155 is 22x4 on ic pin #75, so four paralel resistor each of 22 ohms, and R8138 on ic pin powmax/realpcpower atx psu is 33x4...

[harp]

This "auto-corect" is stupid, i wrote similary but for pin nr.90... wtf node nr.90?!?

[gusto]

Thank you very much for the information. However, during the measurement, some parts jumped off and I didn't fit them anymore. I have to order new ones. I'll get back to you later.

[harp]

Then, just use more flux...