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Finding A Power Supply Schematic
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Michael Karas[_2_]
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Finding A Power Supply Schematic
[This followup was posted to sci.electronics.repair and a copy was sent
to the cited author.]
In article ,
says...
On Fri, 24 May 2013 06:08:53 -0700, Michael Karas
wrote:
[This followup was posted to sci.electronics.repair and a copy was sent to the cited author.]
I am repairing an LCD monitor that has the very common turn on problems.
This is an I-INC IF281D unit with model number showing as HSD1040. I am
in the process of replacing all the capacitors on the PhiHong power
supply board (model PSM217-404-H-R) and have noticed that one transistor
looks like it got excessively hot. I would like to replace that
transistor but have to first ID the part number. To this end I have two
questions...
Does anyone know where it may be possible to get a schematic for the
PSM217-404-H-R power supply board?
The overheated transistor is an SMT device with a code DFRG marked on
top. Any idea as to what that part number may be?
Google 'marking code DFRG' and see if anything makes sense. Also, SMT
is a very generic term. If we knew the specific package, it would
help us help you.
Another resource, especially whre power supplies for LCD monitors are
concerned is www,badcaps.net/forum. Pictures help.
PlainBill
Here is a link to a picture of the transistor in question.
https://docs.google.com/file/d/0BxTb...EMTlDaW8/edit?
usp=sharing
(Note link above may be split by a line break).
The transistor package body is 2.5mm x 4mm. Lead spacing is 1.5mm.
According to a document I checked here at the next link this package is
a SOT-89 (also apparently referred to as a T0-243 or an SC-62).
http://www.nxp.com/documents/outline.../sot089_po.pdf
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Michael Karas
Carousel Design Solutions
http://www.carousel-design.com
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