Industrial Electronics Repair : Bioclimatic Pergola Controller

[@LearnElectronicsRepair]

Thanks to a subscriber, the smd diode is this one. I had identified the correct part but here it is in the correct package www.aliexpress.com/item/1005007654467005.html

[@Jimmyspangle]

Nothing can beat logic. 1 board with twin mirrored circuits is always a help, but methodical cross checking like this gives you the best possible chance of diagnosis. Experience and logic is what makes this work. Great job as always. I have a feeling I know you. I want to be cryptic here and only if I am correct will this make sense. In 1980, did you have a green Scorpion 250?

[@grahameaves3298]

Pretty sure the mystery IC is a Microchip MCP602 TSSOP Op Amp

[@LearnElectronicsRepair]

Cheers. How did you find it, did you recognise the M logo??

[@grahameaves3298]

@@LearnElectronicsRepair I did a search for "IC manufacturer logos" to identify it, then just searched for anything they made with a 602 part number - datasheet then confirmed the part marking matched.

[@g4z-kb7ct]

@@grahameaves3298 I was about to say the same thing but I already knew the logo was Microchip hehe! They are known for PICs and other programmable microcontrollers.

[@twithheldmwithheld8938]

@@grahameaves3298 I came up with the same answer....long after you did, using AI, "If your IC has the marking 602 and a stylized "M" logo, it is likely part of this MCP602 family, especially given the 8-pin configuration and Microchip's branding on the package."

[@1998eclipse1998]

The rectifier diode is a PDU620

[@DJChol]

For removing the conformal coating I have other people seen use MG Chemicals 8310A

[@kailinnainsaari2972]

I sometimes use acetone when I remove such a coating from a circuit board. Dissolves many varnishes, e.g. nail polish 😊. Of course, it quickly evaporates into the air, it also dissolves the flux used in soldering and other impurities and fats, it is also highly flammable 🔥!

[@roboandrew1]

over heat sign solder ball on the side of that third chip

[@malcellery1538]

From the pic you showed at 0:21 it looks as if only the S1 AND S2 connections are used on the respective connector blocks.

[@bouhlassamohamed1337]

Good job 👌

[@maks886]

Is this really the same circuit 4x, or is it just a bridge configuration of fets with protection components

[@Dutch_off_grid_homesteading]

Heya nice video love it

[@Tim750R]

Hi, always enjoy your videos 👍 Any specific tips about desoldering / resoldering those DFN package Mosfets? I haven't come across them before and have a couple to do in the near future. Cheers.

[@maks886]

There is no other way than to use hot air. Add plenty of flux and use a high temperature to avoid heating the surrowunding components for a very long time. They solder / desolder quite easily, because there is a lot of surface tension of the solder on those tiny pads that holds them well in place after it's molten

[@Tim750R]

@@maks886 Many thanks 👍

[@1998eclipse1998]

MCP602 is the ic