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IC 8 pin (unable to identify)

Minder

Apr 24, 2015
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The notation has Chinese method of labeling.
If the device 8 pin ID has been removed, not much chance of ID'ing it, unless some reverse engineering could be done, for the circuit itself.
 

Martaine2005

May 12, 2015
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What makes you think that VU1 is faulty?.
Have you checked the fan itself?.
Better to describe the problem rather than leave us with tid bits.

Martin
 

ReyXing

Sep 22, 2023
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What makes you think that VU1 is faulty?.
Have you checked the fan itself?.
Better to describe the problem rather than leave us with tid bits.

Martin
The fan works when connected to a power supply. TIP122(compared with other new ones) resistance is the same. The VU1 has dent I think is because it popped (I heard it, then the fan stopped). The rests are ok, not sure about the inductor but its resistance is less than 1ohm.
 

ReyXing

Sep 22, 2023
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The notation has Chinese method of labeling.
If the device 8 pin ID has been removed, not much chance of ID'ing it, unless some reverse engineering could be done, for the circuit itself.
This is 2 part:
1 is for the heating element which is OK.

2 is the fan; it's separate.
Connected to the AC source (beside the brown cap) is a 22ohm resistor, then 1diode which is connected to the 4pin of VU1.

Hope anyone here had experienced building a transformerless ADJUSTABLE power supply with an 8pin IC, an inductor and TIP122.
 

ReyXing

Sep 22, 2023
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This is 2 part:
1 is for the heating element which is OK.

2 is the fan; it's separate.
Connected to the AC source (beside the brown cap) is a 22ohm resistor, then 1diode which is connected to the 4pin of VU1.

Hope anyone here had experienced building a transformerless ADJUSTABLE power supply with an 8pin IC, an inductor and TIP122.
IMG_20230922_130731.jpgIMG_20230922_130749.jpg
 

danadak

Feb 19, 2021
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Might as well change both those caps while you are at it.

Kelleys_eye is stating top of cap is slightly bulging, often a sign of
electrolytic cap failure.

1695462865173.png


Regards, Dana.
 

ReyXing

Sep 22, 2023
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The 8-pin device looks to be a MOSFET.
All caps involved in the fan already replaced, still not working.
I think you are right about the bulging cap, but I think the 8pin is also damaged.
The new 8pin Viper22A does not work, do you think TPC8032-H mosfet is the right one, see pic.IMG_20231006_111534.jpgIMG_20231006_111743.jpgScreenshot_2023-10-06-11-58-13-448.jpeg
 

ReyXing

Sep 22, 2023
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Any mosfet experts here who can tell what type this is? If Single N or P, or Dual P N?
Pins 8765 are just one connection, all DRAIN I think. Pin 3 (red dot see pic) no connection.

This is the fan circuit of a hot air soldering. I heard it popped then the fan stopped.
Done troubleshooting, this is all that's left to be replaced.

8 7 6 5
___________
| |
| _ _ _ _|
1 2 3 4
 

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Last edited:

Harald Kapp

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Mod edit: merged two threads for the same topic.
 
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