EEVblog Electronics Community Forum

Electronics => Repair => Topic started by: Jake86us on May 13, 2021, 01:23:48 am

Title: Btech Ham Radio Charger Repair
Post by: Jake86us on May 13, 2021, 01:23:48 am

Hey Guys/Gals

I am working on a Btech charger for my UV-5x3 radio. I think I have blown the Linear Constant Current Charging Chip. The chip is pictured below in the attachment. My question is the chip is a HXN-WS e4956 and all I can find is a HXN-WS e4957. What is the difference between the 4956 and 4957? Can I use the 4957 instead?

thanks for any help you may have!!
Jake

Title: Re: Btech Ham Radio Charger Repair
Post by: Jake86us on May 14, 2021, 12:43:07 am

Where is Dave at, I figured he would know!!

Title: Re: Btech Ham Radio Charger Repair
Post by: geggi1 on May 14, 2021, 08:01:49 am

Some time ago I found a page on the internet showing how to replace the original PCB with a generic charger circuit on the internet.
I can not find this page again.
These Btech chargers are supposedly unreliable.

Here is a description on how to repair the chargers for the 878/868.
http://members.optuszoo.com.au/jason.reilly1/868mods.htm#ChargerFix (http://members.optuszoo.com.au/jason.reilly1/868mods.htm#ChargerFix)

Title: Re: Btech Ham Radio Charger Repair
Post by: Jake86us on May 14, 2021, 12:23:44 pm

Quote from: geggi1 on May 14, 2021, 08:01:49 am

Some time ago I found a page on the internet showing how to replace the original PCB with a generic charger circuit on the internet.
I can not find this page again.
These Btech chargers are supposedly unreliable.

Here is a description on how to repair the chargers for the 878/868.
http://members.optuszoo.com.au/jason.reilly1/868mods.htm#ChargerFix (http://members.optuszoo.com.au/jason.reilly1/868mods.htm#ChargerFix)

Thank you for the info! I'll keep an eye out form a repair tuturial on the btech changers.