Zener DIODE HELP D6 - Element F0V87C
Have a Zener Diode with no markings at location D6 ( behind inputs ). What can I use maybe in increments to fill this void? The TV runs until warm and then shuts off. Keep this Zener cold and runs all night. Any help?? I appreciate it.
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Have a Zener Diode with no markings at location D6 ( behind inputs ). What can I use maybe in increments to fill this void? The TV runs until warm and then shuts off. Keep this Zener cold and runs all night. Any help?? I appreciate it. -
Re: Zener DIODE HELP D6 - Element F0V87C
Sorry..wrong model... Element ELDFT406. -
Re: Zener DIODE HELP D6 - Element F0V87C
I wonder if that is a zener or a small signal diode like 1n4148 .
Normally zeners have a location ZD and the lack of marking or color code is making me think that.Last edited by tw2005; 01-30-2015, 02:28 AM.Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
something else I was thinking that there's a test for zeners that may indicate what voltage it is if it's possible to keep it functional during the test.
example
http://www.learningaboutelectronics....-a-zener-diodeLast edited by tw2005; 01-30-2015, 02:42 AM.Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
Since you can make it function by cooling it, if it is Zener Diode the you will put the red probe on the Cathode and Black probe on the Anode since Zener is used in reverse bias mode and look at what it is shown on the meter and the polarity shown on the meter. If it is regular diode then put red on Anode and Black on Cathode, the Voltage then should shows around 0.6~0.8V.
What DC Voltage do you get at the Anode and chassis Gnd, Cathode and chassis Gnd?
The diode is close to other components so how did you cool it down without cooling other components close by?Last edited by budm; 01-30-2015, 09:59 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=24809Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
To be honest I'd suspect the nearby regulator more than a zener/standard diode...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.Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
Raised it an inch off the board and put drops of coolant on it. As for voltage..the black mark cathode is 23.5 volts and the anode is 23.0.Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
Thought of putting a 24 volt zener TZX24B-TR or 1n4749A but unsure yet.Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
regulators where already changed by the way.Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
So across it is about 0.5V... silicon diode
Drops of coolant, that would conduct and could change the circuit, it's not reliable.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.Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
when testing the TV on. I get .5volts with black on cathode and other end on anode. Reversing gives me -.5volts. Hope this helps. When testing off and testing, I get same results either way.Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
So what should I replace it with??Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
1n4148 be ok?Comment
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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=24809Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
Not clear, so you are getting 0.5V with reference to GND? or across the Diode (Black probe on Cathode, Red probe on Anode)? Then it is in forward bias.
But what do you get when the TV is not working? There must be different when it is good and when it is bad then.Last edited by budm; 01-30-2015, 03:44 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=24809Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
when testing the TV on. I get .5volts with black on cathode and other end on anode. Reversing gives me -.5volts. Hope this helps. When testing off and testing, I get same results either way. When I reference to ground I 23.5 Cathode and 23.0 on anode.Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
The means the Diode is not even bias on, it is in reverse bias mode. The question is that you can make the TV works by cooling this Diode which means that it must be showing different reading when it is not working and when it is working, that is what we are trying to find what the readings are.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=24809Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
guess I will try the 4148...not sure what else to do. It says D6 and usually a Zener is ZD. Don't think that should hurt anything? If you think it's a mistake..let me know..no one else has any info on it and schematics are not available. Hate when components are not labeled.Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
Please do budm's test first. I really do not think it is that diode myself.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.Comment
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Re: Zener DIODE HELP D6 - Element F0V87C
I thought I already did that? Did I miss something?Comment
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My Element 32 inches tv (ELEFW328B) lost it's backlight (confirmed with a flashlight test) and the connector on the PCB (it has one board that has a processor chip, switch mode power supply, and backlight circuit) that has the two wires that go to the backlight LED strips has a very low voltage (28-29 volts) when turned ON, in my opinion.
Started testing components and found an SMD diode or zener that is shorted (even zero fusing resistors read a few tens of milliohms, while this thing reads zero).
I put some pictures here to show that it is labeled "M7".... -
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So I replaced the leds on the strips and they seemingly working fine, but soon as I touch the strip which has a missing Zener diode the whole backlight turns off for a few seconds and then turns back on.
Is this caused by the missing diode? If so what kind of zener diode should I use to replace it?.
The led strips has 9 6V leds.
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