I have a LG power supply/inverter board in a Vizio model VO320E TV that has an open diode. The only marking is T2D 93 with a line under the 3. Having no back ground in electronics I would like to know if this something that Radio Shack would sell and what would I be asking for? I don't seem to be getting any where by Googleing this part. I could use some help please. Thank you
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Have open diode T2D 93
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Re: Have open diode T2D 93
It is quite possible "T2D 93" is a zener diode, and would appear open under normal test conditions.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: Have open diode T2D 93
More likely to be snubber diode like in this post: https://www.badcaps.net/forum/showth...609#post274609
Zener diode will still read like diode when you forward bias it, but you cannot tell its Zenning voltage using the meter, you will have to use variable DC power supply and a current limiter resistor then aplly the reverse bias voltage until it reaches the Zenning voltage point of the zener diode.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: Have open diode T2D 93
Of course, silly me. I was thinking of a TVS, or similar device.
OP - How big is the device? Whereabouts is it on the circuit? It may be possible to guess the value or part.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: Have open diode T2D 93
It may be something like this (TVS Diode):
http://pdf1.alldatasheet.com/datashe.../ST02D-82.html
I cannot find ST02D-93. I have a feeling it will be part of the snubber circuit of the transformer primary side drive section.
Pictures of both side of the board and the location of the parts will help.Last edited by budm; 10-17-2012, 09:39 AM.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: Have open diode T2D 93
Originally posted by budm View PostIt may be something like this (TVS Diode):
http://pdf1.alldatasheet.com/datashe.../ST02D-82.html
I cannot find ST02D-93. I have a feeling it will be part of the snubber circuit of the transformer primary side drive section.
Pictures of both side of the board and the location of the parts will help.
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Re: Have open diode T2D 93
OK, that diode forms RCD network, it should not appear open, so I would guess that's one possible fault.
Are you using the diode test range on your meter to test it?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: Have open diode T2D 93
Originally posted by tom66 View PostOK, that diode forms RCD network, it should not appear open, so I would guess that's one possible fault.
Are you using the diode test range on your meter to test it?
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Re: Have open diode T2D 93
OK, that is the snubber diode for the 5V tsnaby power supply to protect the SMPS IC. Proably similar to the PDF attach, it will read open when check with the meter, you have to have power supply taht puts out high enough voltage to reach the break down voltage of this TVS Diode.
If it is ST02-200, it will read open due to back to back diode setup.
If is is ST02D-170 (Unidirectional TVS Diode), then it will read like diode which I think that is what you have:
Since this is part of the 5V Standby power supply, so you are not getting the 5VSTBY?Last edited by budm; 10-17-2012, 11:57 AM.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
Comment
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Re: Have open diode T2D 93
Originally posted by budm View PostOK, that is the snubber diode for the 5V tsnaby power supply to protect the SMPS IC. Proably similar to the PDF attach, it will read open when check with the meter, you have to have power supply taht puts out high enough voltage to reach the break down voltage of this TVS Diode.
If it is ST02-200, it will read open due to back to back diode setup.
If is is ST02D-170 (Unidirectional TVS Diode), then it will read like diode which I think that is what you have:
Since this is part of the 5V Standby power supply, so you are not getting the 5VSTBY?
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Re: Have open diode T2D 93
If you do have 5V then that snubber diode is OK, If it is bad, the 5V power supply will not be working since that snubber diode is for the 5V power suuply section.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
Comment
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Re: Have open diode T2D 93
Originally posted by ankit007 View Postplease tell me how to check for 5volts stand byNever 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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