 Posted: Sat Jan 09, 2010 8:42 pm Post subject: |
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| Thanks to the previous post I have also been able to fix the photo frame, I used 2 npn transistors labelled 9014 from an old BT answer machine. | |
| Posted: Fri Jan 08, 2010 11:51 am Post subject: Re: Similar problem |
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I didn't find the transistor codes.I found that can put any npn switching transistors. I removed SMD transistors and connected spots by wires to external transistors BD385 which I removed from old TV.They are quite big but there is a lot of space. For now everything is working fine. |
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| Posted: Fri Jan 08, 2010 10:32 am Post subject: Similar problem |
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| Hi I have a photo frame with the same problem, caused by using the wrong power supply. I have pictures of the components and will send them to the email address as I cant see how to attach to post | |
| Posted: Wed Dec 23, 2009 9:41 pm Post subject: |
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Thanks |
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| Posted: Wed Dec 23, 2009 9:30 pm Post subject: |
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| Please don't think I've forgotten you... Not much to go on, but I'm trying... | |
| Posted: Tue Dec 15, 2009 1:40 pm Post subject: |
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There is no manufacturers mark on it.It is too small (SOT89) and there are just these letters: upper line- DK lower line- RN For now I am unable to make a good picture,my camera has no good zoom... |
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| Posted: Mon Dec 14, 2009 9:43 pm Post subject: |
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| There should be a manufacturers mark on it as well. If you can post a reasonable photo of the component, I might be able to help you. Joe |
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| Posted: Mon Dec 14, 2009 8:08 pm Post subject: SMD marking codes |
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| I am trying to fix my Digital picture frame.The LCD back light lamp doesn't light on.Both end transistors of the inverter are gone.Both are the same SOT89 and there are 2 lines mark - DK and RN. Searching on the Net gave me different results-PNP,NPN,MOSFET... I looked the PCB and it seems they are NPN but not sure...I can see the "collectors" are connected to both terminals of the transformer's coil,which mid terminal goes to +9v.The "emitters" goes to ground... How to find out the type and parameters of the transistors? |
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