Lenmar MSCAA battery charger.

D

David Farber

Guest
This Lenmar MSCAA battery charger has a capacity of up to 4 AA or AAA NiMH
batteries. Recently, the red charging l.e.d. over one of the cells began
blinking shortly after the charge cycle began. I measure the voltage for
that cell while being charged and it was not higher than the cell itself. I
tried different batteries all with the same result. There was also some
burning type smell. I disassembled the unit and the pc board felt warm under
that cell. I used my IR temperature gun and the smd IC that is adjacent to
the positive charging terminal was about 30 degrees Fahrenheit warmer (130
degrees and rising) than the other three smd chips for their respective
charging slots. I turned the power off so as not to cause more damage to the
components. I was wondering what this smd component was. I have not been
able to id the number: 4800 on the top line, then BD4P15 on the bottom line.
I figure it's worth a shot to replace it.

http://webpages.charter.net/mrfixiter/images/smd/Charger-smd.jpg

Thanks for your reply.
--
David Farber
Los Osos, CA
 
David Farber scribbled thus:

This Lenmar MSCAA battery charger has a capacity of up to 4 AA or AAA
NiMH batteries. Recently, the red charging l.e.d. over one of the
cells began blinking shortly after the charge cycle began. I measure
the voltage for that cell while being charged and it was not higher
than the cell itself. I tried different batteries all with the same
result. There was also some burning type smell. I disassembled the
unit and the pc board felt warm under that cell. I used my IR
temperature gun and the smd IC that is adjacent to the positive
charging terminal was about 30 degrees Fahrenheit warmer (130 degrees
and rising) than the other three smd chips for their respective
charging slots. I turned the power off so as not to cause more damage
to the components. I was wondering what this smd component was. I have
not been able to id the number: 4800 on the top line, then BD4P15 on
the bottom line. I figure it's worth a shot to replace it.

http://webpages.charter.net/mrfixiter/images/smd/Charger-smd.jpg

Thanks for your reply.
Click to expand...

I can't find that number but from the picture it could be a power fet. A
40v - 1.5a device using the number.

--
Best Regards:
Baron.
 
Baron wrote:
David Farber scribbled thus:

This Lenmar MSCAA battery charger has a capacity of up to 4 AA or AAA
NiMH batteries. Recently, the red charging l.e.d. over one of the
cells began blinking shortly after the charge cycle began. I measure
the voltage for that cell while being charged and it was not higher
than the cell itself. I tried different batteries all with the same
result. There was also some burning type smell. I disassembled the
unit and the pc board felt warm under that cell. I used my IR
temperature gun and the smd IC that is adjacent to the positive
charging terminal was about 30 degrees Fahrenheit warmer (130 degrees
and rising) than the other three smd chips for their respective
charging slots. I turned the power off so as not to cause more damage
to the components. I was wondering what this smd component was. I
have not been able to id the number: 4800 on the top line, then
BD4P15 on the bottom line. I figure it's worth a shot to replace it.

http://webpages.charter.net/mrfixiter/images/smd/Charger-smd.jpg

Thanks for your reply.

I can't find that number but from the picture it could be a power
fet. A 40v - 1.5a device using the number.
Click to expand...

Do you have any idea what would be a suitable replacement?

Thanks for your reply.
--
David Farber
Los Osos, CA
 
David Farber scribbled thus:

Baron wrote:
David Farber scribbled thus:

This Lenmar MSCAA battery charger has a capacity of up to 4 AA or
AAA NiMH batteries. Recently, the red charging l.e.d. over one of
the cells began blinking shortly after the charge cycle began. I
measure the voltage for that cell while being charged and it was not
higher than the cell itself. I tried different batteries all with
the same result. There was also some burning type smell. I
disassembled the unit and the pc board felt warm under that cell. I
used my IR temperature gun and the smd IC that is adjacent to the
positive charging terminal was about 30 degrees Fahrenheit warmer
(130 degrees and rising) than the other three smd chips for their
respective charging slots. I turned the power off so as not to cause
more damage to the components. I was wondering what this smd
component was. I have not been able to id the number: 4800 on the
top line, then BD4P15 on the bottom line. I figure it's worth a shot
to replace it.

http://webpages.charter.net/mrfixiter/images/smd/Charger-smd.jpg

Thanks for your reply.

I can't find that number but from the picture it could be a power
fet. A 40v - 1.5a device using the number.

Do you have any idea what would be a suitable replacement?

Thanks for your reply.
Click to expand...

Not really ! I would imagine any 8 pin sot fet with those sort of
voltage and current capabilities will do. Just make sure its the right
type, p or n. If it is a fet then there will only be three
connections. If four then all bets are off...

--
Best Regards:
Baron.
 
"Baron" <baron@linuxmaniac.net> wrote in message
news:lfvlsh$nh4$1@dont-email.me...
David Farber scribbled thus:

Baron wrote:
David Farber scribbled thus:

This Lenmar MSCAA battery charger has a capacity of up to 4 AA or
AAA NiMH batteries. Recently, the red charging l.e.d. over one of
the cells began blinking shortly after the charge cycle began. I
measure the voltage for that cell while being charged and it was not
higher than the cell itself. I tried different batteries all with
the same result. There was also some burning type smell. I
disassembled the unit and the pc board felt warm under that cell. I
used my IR temperature gun and the smd IC that is adjacent to the
positive charging terminal was about 30 degrees Fahrenheit warmer
(130 degrees and rising) than the other three smd chips for their
respective charging slots. I turned the power off so as not to cause
more damage to the components. I was wondering what this smd
component was. I have not been able to id the number: 4800 on the
top line, then BD4P15 on the bottom line. I figure it's worth a shot
to replace it.

http://webpages.charter.net/mrfixiter/images/smd/Charger-smd.jpg

Thanks for your reply.

I can't find that number but from the picture it could be a power
fet. A 40v - 1.5a device using the number.

Do you have any idea what would be a suitable replacement?

Thanks for your reply.

Not really ! I would imagine any 8 pin sot fet with those sort of
voltage and current capabilities will do. Just make sure its the right
type, p or n. If it is a fet then there will only be three
connections. If four then all bets are off...

--
Best Regards:
Baron.
Click to expand...

Hi Baron,

Sometimes I'll share stories with my wife about my repair issues. She used
to work for a company that manufactured pc boards for computers. So she
e-mailed some old colleagues with the picture of the part and what do you
know? A data sheet appeared in my inbox.
http://www.alldatasheet.com/datasheet-pdf/pdf/483729/AOSMD/AO4800B_11.html

Digi-Key sells it for 79 cents. I'm adding it to my next parts order. (-:

Thanks for your reply.
--
David Farber
Los Osos, CA
 
David Farber scribbled thus:

"Baron" <baron@linuxmaniac.net> wrote in message
news:lfvlsh$nh4$1@dont-email.me...
David Farber scribbled thus:

Baron wrote:
David Farber scribbled thus:

This Lenmar MSCAA battery charger has a capacity of up to 4 AA or
AAA NiMH batteries. Recently, the red charging l.e.d. over one of
the cells began blinking shortly after the charge cycle began. I
measure the voltage for that cell while being charged and it was
not higher than the cell itself. I tried different batteries all
with the same result. There was also some burning type smell. I
disassembled the unit and the pc board felt warm under that cell.
I used my IR temperature gun and the smd IC that is adjacent to
the positive charging terminal was about 30 degrees Fahrenheit
warmer (130 degrees and rising) than the other three smd chips for
their respective charging slots. I turned the power off so as not
to cause more damage to the components. I was wondering what this
smd component was. I have not been able to id the number: 4800 on
the top line, then BD4P15 on the bottom line. I figure it's worth
a shot to replace it.

http://webpages.charter.net/mrfixiter/images/smd/Charger-smd.jpg

Thanks for your reply.

I can't find that number but from the picture it could be a power
fet. A 40v - 1.5a device using the number.

Do you have any idea what would be a suitable replacement?

Thanks for your reply.

Not really ! I would imagine any 8 pin sot fet with those sort of
voltage and current capabilities will do. Just make sure its the
right
type, p or n. If it is a fet then there will only be three
connections. If four then all bets are off...

--
Best Regards:
Baron.

Hi Baron,

Sometimes I'll share stories with my wife about my repair issues. She
used to work for a company that manufactured pc boards for computers.
So she e-mailed some old colleagues with the picture of the part and
what do you know? A data sheet appeared in my inbox.

http://www.alldatasheet.com/datasheet-pdf/pdf/483729/AOSMD/AO4800B_11.html

Digi-Key sells it for 79 cents. I'm adding it to my next parts order.
(-:

Thanks for your reply.
Click to expand...

Great Stuff !
I didn't think to try 4800 as a search key. :-(
Never mind. Glad you got it sorted.

--
Best Regards:
Baron.
 
"Baron" <baron@linuxmaniac.net> wrote in message
news:lg2c6v$290$1@dont-email.me...
David Farber scribbled thus:


"Baron" <baron@linuxmaniac.net> wrote in message
news:lfvlsh$nh4$1@dont-email.me...
David Farber scribbled thus:

Baron wrote:
David Farber scribbled thus:

This Lenmar MSCAA battery charger has a capacity of up to 4 AA or
AAA NiMH batteries. Recently, the red charging l.e.d. over one of
the cells began blinking shortly after the charge cycle began. I
measure the voltage for that cell while being charged and it was
not higher than the cell itself. I tried different batteries all
with the same result. There was also some burning type smell. I
disassembled the unit and the pc board felt warm under that cell.
I used my IR temperature gun and the smd IC that is adjacent to
the positive charging terminal was about 30 degrees Fahrenheit
warmer (130 degrees and rising) than the other three smd chips for
their respective charging slots. I turned the power off so as not
to cause more damage to the components. I was wondering what this
smd component was. I have not been able to id the number: 4800 on
the top line, then BD4P15 on the bottom line. I figure it's worth
a shot to replace it.

http://webpages.charter.net/mrfixiter/images/smd/Charger-smd.jpg

Thanks for your reply.

I can't find that number but from the picture it could be a power
fet. A 40v - 1.5a device using the number.

Do you have any idea what would be a suitable replacement?

Thanks for your reply.

Not really ! I would imagine any 8 pin sot fet with those sort of
voltage and current capabilities will do. Just make sure its the
right
type, p or n. If it is a fet then there will only be three
connections. If four then all bets are off...

--
Best Regards:
Baron.

Hi Baron,

Sometimes I'll share stories with my wife about my repair issues. She
used to work for a company that manufactured pc boards for computers.
So she e-mailed some old colleagues with the picture of the part and
what do you know? A data sheet appeared in my inbox.

http://www.alldatasheet.com/datasheet-pdf/pdf/483729/AOSMD/AO4800B_11.html

Digi-Key sells it for 79 cents. I'm adding it to my next parts order.
(-:

Thanks for your reply.

Great Stuff !
I didn't think to try 4800 as a search key. :-(
Never mind. Glad you got it sorted.

--
Best Regards:
Baron.
Click to expand...

I finally ordered the part and installed the new chip. The charging l.e.d.
which had been continuously blinking is now steady and the charging process
is back to normal.

Thanks for your reply.
--
David Farber
Los Osos, CA
 
David Farber scribbled thus:

"Baron" <baron@linuxmaniac.net> wrote in message
news:lg2c6v$290$1@dont-email.me...
David Farber scribbled thus:


"Baron" <baron@linuxmaniac.net> wrote in message
news:lfvlsh$nh4$1@dont-email.me...
David Farber scribbled thus:

Baron wrote:
David Farber scribbled thus:

This Lenmar MSCAA battery charger has a capacity of up to 4 AA
or AAA NiMH batteries. Recently, the red charging l.e.d. over
one of the cells began blinking shortly after the charge cycle
began. I measure the voltage for that cell while being charged
and it was not higher than the cell itself. I tried different
batteries all with the same result. There was also some burning
type smell. I disassembled the unit and the pc board felt warm
under that cell. I used my IR temperature gun and the smd IC
that is adjacent to the positive charging terminal was about 30
degrees Fahrenheit warmer (130 degrees and rising) than the
other three smd chips for their respective charging slots. I
turned the power off so as not to cause more damage to the
components. I was wondering what this smd component was. I have
not been able to id the number: 4800 on the top line, then
BD4P15 on the bottom line. I figure it's worth a shot to replace
it.

http://webpages.charter.net/mrfixiter/images/smd/Charger-smd.jpg

Thanks for your reply.

I can't find that number but from the picture it could be a power
fet. A 40v - 1.5a device using the number.

Do you have any idea what would be a suitable replacement?

Thanks for your reply.

Not really ! I would imagine any 8 pin sot fet with those sort of
voltage and current capabilities will do. Just make sure its the
right
type, p or n. If it is a fet then there will only be three
connections. If four then all bets are off...

--
Best Regards:
Baron.

Hi Baron,

Sometimes I'll share stories with my wife about my repair issues.
She used to work for a company that manufactured pc boards for
computers. So she e-mailed some old colleagues with the picture of
the part and what do you know? A data sheet appeared in my inbox.


http://www.alldatasheet.com/datasheet-pdf/pdf/483729/AOSMD/AO4800B_11.html

Digi-Key sells it for 79 cents. I'm adding it to my next parts
order. (-:

Thanks for your reply.

Great Stuff !
I didn't think to try 4800 as a search key. :-(
Never mind. Glad you got it sorted.

--
Best Regards:
Baron.

I finally ordered the part and installed the new chip. The charging
l.e.d. which had been continuously blinking is now steady and the
charging process is back to normal.

Thanks for your reply.
Click to expand...

Great stuff :) Glad you got it fixed. Thanks for letting us know. :)

--
Best Regards:
Baron.
 
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