electronic ballast repair

Guest
Hello all,

This little electronic ballast for a 11W fluorescent tube (2 pin one)
failed.
I found a bad electrolitic a fried 1.2 ohm resistor and a shorted
active device which I failed to identify. Looks like a TO-126
transistor, it is marked Si 1300313.
There's another identical transistor, but either is burned too (but
not shorted like the other) or isn't either BJT nor mosfet as every
terminal has some measurable resistance (in the hundreds of ohms
range) with every other terminal, either polarity (but resistance is
different with polarity reversed).
Any hint on how to identify this? Would be easier to just buy another
one, but this stupid thing failed after only 8 months use, I wouldn't
want to change ballasts more often than lamps.

Thanks in advance and best regards
Francesco
 
On Sep 19, 3:33 am, francesco.messi...@gmail.com wrote:
Hello all,

This little electronic ballast for a 11W fluorescent tube (2 pin one)
failed.
I found a bad electrolitic a fried 1.2 ohm resistor and a shorted
active device which I failed to identify. Looks like a TO-126
transistor, it is marked Si 1300313.
There's another identical transistor, but either is burned too (but
not shorted like the other) or isn't either BJT nor mosfet as every
terminal has some measurable resistance (in the hundreds of ohms
range) with every other terminal, either polarity (but resistance is
different with polarity reversed).
Any hint on how to identify this? Would be easier to just buy another
one, but this stupid thing failed after only 8 months use, I wouldn't
want to change ballasts more often than lamps.

Thanks in advance and best regards
Francesco
Click to expand...
was it an FEIT lamp, they have ntoriously short life? They are fun to
play with but not to really repair.
 
On 19 Set, 18:05, "hr(bob) hofm...@att.net" <hrhofm...@att.net> wrote:
On Sep 19, 3:33 am, francesco.messi...@gmail.com wrote:




was it an FEIT lamp, they have ntoriously short life? They are fun to
play with but not to really repair.
Click to expand...
If I'd only know what an FEIT lamp is...

Thanks
Francesco
 
On Fri, 19 Sep 2008 01:33:52 -0700 (PDT), francesco.messineo@gmail.com
put finger to keyboard and composed:

I found a bad electrolitic a fried 1.2 ohm resistor and a shorted
active device which I failed to identify. Looks like a TO-126
transistor, it is marked Si 1300313.
Click to expand...
FWIW, "Si" is a prefix used by Vishay Siliconix:
http://www.vishay.com/company/brands/siliconix/

I suspect that the part number may be a special order.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
On Sep 19, 11:48 am, francesco.messi...@gmail.com wrote:
On 19 Set, 18:05, "hr(bob) hofm...@att.net" <hrhofm...@att.net> wrote:

On Sep 19, 3:33 am, francesco.messi...@gmail.com wrote:

was it an FEIT lamp, they have ntoriously short life?  They are fun to
play with but not to really repair.

If I'd only know what an FEIT lamp is...

Thanks
Francesco
Click to expand...
FEIT is a brand of lamp, like Sylvania, Philips,etc.
 
Maybe that is a MJE13003, a common BJT used in CFL.
Usually there is a smaller electrolytic capacitor that went dry,
this makes switching transistors overheat & short circuit.

Wicaksono

francesco.messi...@gmail.com wrote:
Hello all,

This little electronic ballast for a 11W fluorescent tube (2 pin one)
failed.
I found a bad electrolitic a fried 1.2 ohm resistor and a shorted
active device which I failed to identify. Looks like a TO-126
transistor, it is marked Si 1300313.
There's another identical transistor, but either is burned too (but
not shorted like the other) or isn't either BJT nor mosfet as every
terminal has some measurable resistance (in the hundreds of ohms
range) with every other terminal, either polarity (but resistance is
different with polarity reversed).
Any hint on how to identify this? Would be easier to just buy another
one, but this stupid thing failed after only 8 months use, I wouldn't
want to change ballasts more often than lamps.

Thanks in advance and best regards
Francesco
Click to expand...
 
On Sun, 21 Sep 2008 00:07:49 -0700 (PDT), Wicaksono
<w_saono@lycos.com> put finger to keyboard and composed:

Maybe that is a MJE13003, a common BJT used in CFL.
Usually there is a smaller electrolytic capacitor that went dry,
this makes switching transistors overheat & short circuit.
Click to expand...
Your post jogged my memory.

Here are a bunch of reverse engineered CFL circuits, many of which use
MJE13003 transistors:

http://www.pavouk.org/hw/lamp/en_index.html

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
On 21 Set, 09:07, Wicaksono <w_sa...@lycos.com> wrote:
Maybe that is a MJE13003, a common BJT used in CFL.
Usually there is a smaller electrolytic capacitor that went dry,
this makes switching transistors overheat & short circuit.
Click to expand...
Yes, it's definitely an MJE13003 clone, unfortunately it's not easy to
find
a TO-126 equivalent here. Ordering online woult cost way more than the
ballast is worth.
Thanks anyway, learning is always good.

Best regards
Francesco
 
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