BCD436HP/BCD536HP: BCD436 Stopped Powering On

[KI5IRE]

Has anyone had an issue with a BCD436 no longer powering on?

The unit was bought back in 2018 or so, and has lived most of it's life plugged in via USB power either at my desk, or in my vehicle for work (news).

I noticed the other day that it was not powering on, so I swapped the batteries thinking maybe the rechargeable batteries had just gone bad.

I also noticed, there is an audible buzzing/humming noise, just loud enough to hear if you put your ear up next to the speaker. It does this under power via USB to 12v, and USB to an Apple charging brick (what I've used for all of my Uniden scanners), but not when connected to my PC's power port.

Also, if I plug the unit into my computer, it recognizes a USB device being plugged in, but does not show up as a USB Mass Storage Device, and instead shows "Unknown USB Device (Device Descriptor Request Failed)" in Windows Device Manager.

I have tried removing the SD card and batteries, and trying new batteries.

All of that...no luck getting either the screen or the keypad to illuminate.

 

[donc13]

You say you removed the SD card, did you try replacing it with a new one?

 

[buddrousa]

Sounds like it needs a trip to Uniden Repair.

Uniden | A World Without Wires - Uniden Repair Center

Do not forget to add you email address to the repair form so you can get the email bill to pay so they will ship your scanner back to you.

Uniden | A World Without Wires - Uniden Repair Center

 

[mc48]

You can try a hard reset. Press and hold 2, 9, and Dept when you power on the scanner will reset it.

See this thread.

BCD436HP/BCD536HP: - Won't turn on

I've got a brand new BCD436HP that unfortunately will not turn on. Yesterday it had a low battery warning but I've since switched batteries(brand new ones) and it's now completely unresponsive. I've tried plugging it into my computer's USB, removing/re-inserting the batteries etc but the...

forums.radioreference.com

 

[Ubbe]

I have tried removing the SD card and batteries,

If the CPU are working and its firmware are not corrupt the display would say "No batteries" as soon as USB power are applied. If the scanner are powering the SD card interface it would be recognized as an unknown USB device from a PC.

If the firmware are corrupt or the CPU and and it's peripheral circuits are broken it will not show anything on the display.

If a SD card are used in the scanner it will try and read that at power on before anything else are happening, as the start of service mode are read from it, and the display can in some cases be blank depending of what are on the SD card.

/Ubbe

 

[tvengr]

I repaired a BCD536HP which appeared to be totally dead by replacing the SD Card. No backlight, no display, nothing.

 

[KI5IRE]

You say you removed the SD card, did you try replacing it with a new one?

I repaired a BCD536HP which appeared to be totally dead by replacing the SD Card. No backlight, no display, nothing.

I replaced it within the last year from the factory SD card with a 32 GB Transcend High Endurance SD card. I have never had one of those fail in any of the cameras I've used them in. So, I'd hope that's not it. No luck with the SD card swap though after trying this evening.

Sounds like it needs a trip to Uniden Repair.

Uniden | A World Without Wires - Uniden Repair Center

Do not forget to add you email address to the repair form so you can get the email bill to pay so they will ship your scanner back to you.

Uniden | A World Without Wires - Uniden Repair Center

Kinda what I was thinking. This unit needs a lot of repairs, the screw hole on the back is totally stripped out, keybad is worn, and the USB port is falling apart. With the flat rate repair, will they just fix everything wrong with the unit at one time?

You can try a hard reset. Press and hold 2, 9, and Dept when you power on the scanner will reset it.

See this thread.

BCD436HP/BCD536HP: - Won't turn on

I've got a brand new BCD436HP that unfortunately will not turn on. Yesterday it had a low battery warning but I've since switched batteries(brand new ones) and it's now completely unresponsive. I've tried plugging it into my computer's USB, removing/re-inserting the batteries etc but the...

forums.radioreference.com

Just tried this, no luck unfortunately.

If the CPU are working and its firmware are not corrupt the display would say "No batteries" as soon as USB power are applied. If the scanner are powering the SD card interface it would be recognized as an unknown USB device from a PC.

If the firmware are corrupt or the CPU and and it's peripheral circuits are broken it will not show anything on the display.

If a SD card are used in the scanner it will try and read that at power on before anything else are happening, as the start of service mode are read from it, and the display can in some cases be blank depending of what are on the SD card.

/Ubbe

Tried a new card, no luck there either. I think it's the CPU. Would explain the buzzing noise too.

 

[buddrousa]

Include a list of all the things wrong you want replaced and place it in the box next to the scanner.