I have this Panasonic sc board and they make a repair kit for this but I wanna know how to check these transistors and diodes?
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how to check these surface mount transistors and diodes?
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Re: how to check these surface mount transistors and diodes?
Like any other transistor, just check across pairs of pins for shorts.
The middle pin and tab are electrically connected internally, so you don't have to test that.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
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Re: how to check these surface mount transistors and diodes?
Yes, and if one transistor in a parallel "set" is bad, ALWAYS replace other transistors in that same set, as well as all transistors in series.
Failure to do this can lead to an explosive first power on...Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
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Re: how to check these surface mount transistors and diodes?
check the IGBTs first in cct. then desolder and lift the 2 legs reconfirm whats shorted. You'll probably find with the shorted IGBTs isolated the diodes often will show as good.
check the gate resistors too once the bad IGBTs are removed.
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Re: how to check these surface mount transistors and diodes?
Originally posted by Ltank View PostIt takes a lot of heat to remove these mosfets. Chip-Quik can be very helpful. Care must be taken not to damage the foil traces on boards. Practice on a bad board that is not repairablePlease do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
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Re: how to check these surface mount transistors and diodes?
Originally posted by tom66 View PostI use 400C temperature with a 65W soldering iron. They come off easily. The pads are very large and hard to damage.
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Re: how to check these surface mount transistors and diodes?
"how to check these surface mount transistors and diodes?" Same way as you test the Through hole devices. If it does not read right then you have to remove it and test it off the board.
Surface mounted device still functions the same way as the through hole device.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: how to check these surface mount transistors and diodes?
Did you actually read any of the posts above?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
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Re: how to check these surface mount transistors and diodes?
Originally posted by mattstolte View PostSo just put in diode mode should read between 400 and 700 one way and open the opposite way?
MOSFET is another story.
May be you should get a hold of some good NPN, PNP transistors and some N-CH, P-CH MOSFETS, then look up the pin out and take the readings to see what you get on the good device.Last edited by budm; 09-24-2015, 07:02 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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