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Nedis video doorbell WIFICDP20GY

Tool suggestions, soldering tips, general useful electronics knowhow.
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peters
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Re: Nedis video doorbell

Post by peters »

There is a third board underneath the usb/SD card board.

There is a similar 5 pin but with different markings.

The doorbell is model WIFICDP20GY
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rubber_jonnie
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Re: Nedis video doorbell

Post by rubber_jonnie »

peters wrote: Tue Mar 18, 2025 11:33 am There is a third board underneath the usb/SD card board.

There is a similar 5 pin but with different markings.
I think without the schematic or a BoM you may be out of luck.
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peters
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Re: Nedis video doorbell

Post by peters »

This is the first time I've ever been able to see a blown component and it can't be identified. :-(
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Re: Nedis video doorbell

Post by rubber_jonnie »

peters wrote: Tue Mar 18, 2025 11:36 am This is the first time I've ever been able to see a blown component and it can't be identified. :-(
Happens a lot with blown SMD, they are so small the damage is too much to identify them. I had it with my old microscope, the LED ring stopped working and it was too damaged to ID. Luckily it wasn't an expensive scope.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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peters
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Re: Nedis video doorbell

Post by peters »

The RT1 component next to the blown chip is on the reverse of the board. When reassembled it would be inside the battery compartment right next to the li-ion 18650 batteries.

Could it be part of a thermal protection circuit ?
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Re: Nedis video doorbell

Post by rubber_jonnie »

peters wrote: Tue Mar 18, 2025 12:02 pm The RT1 component next to the blown chip is on the reverse of the board. When reassembled it would be inside the battery compartment right next to the li-ion 18650 batteries.

Could it be part of a thermal protection circuit ?
Difficult to say without any knowledge of what RT1 is and what it does in the circuit.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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peters
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Re: Nedis video doorbell

Post by peters »

It's a black, bead like through hole 2 pin. I think it's a thermistor.
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Re: Nedis video doorbell

Post by rubber_jonnie »

peters wrote: Tue Mar 18, 2025 12:37 pm It's a black, bead like through hole 2 pin. I think it's a thermistor.
Yep likely a thermistor, but unless it has direct connections to U1 you can't say it's related. I've looked for a schematic and can't find any, the best suggestion I can make at this point is to clean the burned part with a little IPA and take a close up photo of it so we can have a go at decoding what it is based on the markings that are left.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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peters
Posts: 191
Joined: Sat Feb 25, 2023 8:44 pm

Re: Nedis video doorbell

Post by peters »

There are no markings left, as soon as I touched it they crumbled.
IMG_20250318_140837062_HDR.jpg
IMG_20250318_140837062_HDR.jpg (216.33 KiB) Viewed 494 times
There are a lot of voltage regulators like 3AC93, 3DE93 etc.
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peters
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Re: Nedis video doorbell

Post by peters »

I suppose the only hope is that someone else has a working one that we can get the component number from.
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