Cell Ph Charger Let the Smoke Out

In article , snipped-for-privacy@fox.net mentioned...

You're probably right, except it's probably more like ten or twenty dollars. I think more towards the latter.

I have a good stock of parts, if I could only find out what the part is. So I could fix it for free. I may buy another one just to see what they use. With my luck, it would be just a power resistor (to limit the current) and zener (to limit the voltage), nothing more.

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Luckily I have the same charger that's used for Nokia cell phones. I purchased 2 of them from 99 cent store one for Motorola starTAC and one for my Nokia Cell phone. If you are insisting on fixing your charger here is the Q1 part number PN2907A.

Trash

Cig

In article , snipped-for-privacy@fox.net mentioned...

Thank you for checking. But now the problem is how do I reconcile the difference in pinout between the burned out transistor, which has a standard Japanese pinout of E C B, with the pinout of a PN2907A, which has a standard JEDEC pinout of E B C. Something's wrong here.

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goes directly to the trash unless you add NOSPAM in the 
Subject: line with other stuff.  alondra101  hotmail.com
Don't be ripped off by the big book dealers.  Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com  You'll be glad you did!
Just when you thought you had all this figured out, the gov't
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for

the

I really don't understand why you want to repair this throwaway item. I like playing around with lost causes myself, but a cellphone car charger? Even here in 'rip-off Britain' they are only about 3 or 4 quid (that's 4-6 bucks;-))

Dave

Look this web site for PN2907A Data , and if you look close with magnifying lens you will find out Q1 is not inside silk screen, it is shifted. I have the same charger in my hand . Board no, HH-05A BCC

Nothing is wrong, trust me Cyrus

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In article , snipped-for-privacy@fox.net mentioned...

I tried a couple times to d/l the Fairchild data sheet, but it just gave me an hourglass for ten minutes, so I went to the Philips website and downloaded their .pdf of PN2907A. As I mentioned, the pinout is E B C, and the transistor that fried has a pinout of E C B. The board says HH-S01DS and 20 SEP 02 on it. I don't think you have the same PC board as mine. Thanks.

[snip]

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goes directly to the trash unless you add NOSPAM in the 
Subject: line with other stuff.  alondra101  hotmail.com
Don't be ripped off by the big book dealers.  Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com  You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@

You better get a new one. You will end up spending a lot of time on it, and near the cost of replacing it. Then if you fix it, and it is not correct because of something else you missed, you stand the chance of damaging the phone. Now this will be expensive!

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Greetings,

My cell phone cig lighter charger let the smoke out. The plastic sleeve around the inductor was fried, so I pulled it out and it measured 4.1 uH; whether that's correct or whether it has shorteed turns, I don't know.

The Q1 high current PNP or P-Ch FET case split open, and it and the inductor got so hot that it melted the solder and discolored the PC board. But I don't think the traces are damaged. BTW, it's all thru hole parts. :-)

My main problem is that I can't read the part number on the Q1. It's a TO-92 case, and looks like it would be a PNP Japanese type transistor because the pinout is EBC (or the equivalent SDG in a FET). I presumed this because the other two transistors are Japanese, as marked below in the schematic. The unit is marked made in China. The only things I can read on the face of the transistor case is an HE on the upper right, and a C below that on the lower right.

I believe it failed bacause the lousily soldered wires were so very close to shorting, but not touching the traces that it passed testing, but then shorted and failed later. I got some pics, and I may post them to ABSE. I looked at Sam's repair info here but couldn't find anything about the SMPS or any transistors.

The cig lighter plug case popped apart easily, so if you have one and a minute, find out what the part number is and post it for us all. I got to d/l and try out the Andy's schematic prog, and I entered the schem, but I'm not sure about the value of the 100k 1%. It seems too high, so I might be reading the bands backwards. Thanks.

View with courier Font

Cell Phone Charger by Watson A.Name Aug 30, 03 Down converts 12V auto cigarette lighter to the cell phone battery voltage.

o------+--------+---------------------+ Q1 TO-92 + IN | | | PNP HI CURR ?? | | Q2 2SA733 | or P-Ch FET ?? +------+ |< |< (totally fried) | +-----| +-----------| | | |\ | |\ | .-. | | | 4.1 uH | 2K | | +-------+ | ___ | 1/8W| | | +------------+--------UUU-------+---o | '-' .-. | 1N | | + OUT .-. | | |1.8k | 5819 - +--------+---+ RED | | | | |1/2W | Scho ^ | | | | |3.3k | '-' --- ttky | | -. | + '-' | | --- 470 == | 560 | | ### | | === | pF Cer GND | ohm | | -+- | LED | GND | | '-' | 100 uF V --> +----------------+ | | | 16V - --> | 560 100k 1/8W| +---+ | | ohm ___ 1% | === === | +---|___|--+---|___|---+ GND GND | | | + | | ### 10 uF +----------+----o \| | --- | | - OUT Q3 2SA945 +--+-------+ | | 1.5 .-. BLK

With out " Adobe Acrobat 5.0 " or 4.0 software at your Computer ,it is impossible to open that screen. It shows B is in the center of PN2907A. It is strange, these are few parts that I can see on the board. Q1= PN2907A Q2= A733 Q3= C945 C1=471 C2=10uF C3= 100uF L1= Coil R6= 3.3 Ohm 1/2W R4=560 OHM R5= 1K %1 1.8k 1/2w 3.3K

1N 5 XXXX Diode 2KOkm LED 100kOhm 1% it seems 1N4148 diode total of 18 patrs . With PCB 19 Parts.

magnifying

have

I

one

here is

In article , snipped-for-privacy@hotmail.com mentioned...

I found the data sheet for the 2SB1217 on the NEC website, and it looks like it's a TO-126 case. I tried a transistor in that case that I had in the junk box and it might fit if I file down the stoppers on the leads. It looks like a good choice, spec wise. The KSB722 didn't come up with anything in Google so I went to both Fairchild and

websites, but came up with nothing. So I tried and it came back with no match. Thanks.

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###Got a Question about ELECTRONICS?   Check HERE First:###
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Don't be ripped off by the big book dealers.  Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com  You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@

In article , snipped-for-privacy@fox.net mentioned...

Yeah, I had no problem d/l'ing the .PDF of the Philips PN2907A (I have acrobat reader 5.0). I had problems with reading the 1%ers, because they have the bands evenly spaced so it's difficult to tell which end goes on the left. I also got 100k, 1%, but that seems too high. Thanks for the additional info. I'm gonna look for another replacement at the Rat Shack store, but my guess is that it'll cost over ten dollars. Maybe I should check Wal-mart or Target..

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###Got a Question about ELECTRONICS?   Check HERE First:###
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My email address is whitelisted.  *All* email sent to it 
goes directly to the trash unless you add NOSPAM in the 
Subject: line with other stuff.  alondra101  hotmail.com
Don't be ripped off by the big book dealers.  Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com  You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@

In article , snipped-for-privacy@total.net mentioned...

Yeah, I thought about that, too. When it fried, it blew out the 2 Amp fuse in the nose of the cig lighter plug. I'm wondering if it didn't damage the charging circuit in the phone. The phone is working okay, but I haven't charged it since it went bad. I'll have to check.

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###Got a Question about ELECTRONICS?   Check HERE First:###
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goes directly to the trash unless you add NOSPAM in the 
Subject: line with other stuff.  alondra101  hotmail.com
Don't be ripped off by the big book dealers.  Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com  You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@