Working in Hanns.g monitor HL273 with bad power supply. It appears to have short B90N08 diode. Can someone cross reference the diode since I can't find it to purchase.
Thanks
Thanks
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Re: Cross reference for B90N08
The main fuse also blown? And yes, pictures of what you are working on.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: Cross reference for B90N08
I removed diode from board and all 3 leads are short to each other. The main fuse is not blown, all capacitors are ok. During lead lifting I damaged diode so I will need it anyway. I will post pictures shortly.Comment
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Re: Cross reference for B90N08
Here is the pictureAttached FilesComment
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Re: Cross reference for B90N08
I put the diode back for reference of placement on board. You can see damage from removal.Attached FilesComment
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Re: Cross reference for B90N08
A 90N08 should be something like a 90A, 80V Mosfet. However, IF that is shorted, then the fuse should be blown and maybe a few more parts yet, as budm already suggested. Pictures would be nice indeed.
Never mind me on the pictures....Last edited by CapLeaker; 08-24-2016, 04:06 PM.Comment
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Re: Cross reference for B90N08
Yeah... I can see it. Q2 you are talking about. That's a Mosfet. Trick is to preheat that board first, or having a sodering iron with some "Ooomph".Comment
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Re: Cross reference for B90N08
You could have removed it by applying plenty of fresh solder on the tab and keeping your soldering iron on it until you can lift it up with tweezers or small nose pliers.Last edited by dick_barton; 08-24-2016, 04:36 PM.Willing to help but I'm no expert.Comment
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Re: Cross reference for B90N08
Digikey have some similar logic gate level mosfets eg FDD3570-ND which may be a suitable replacement.Willing to help but I'm no expert.Comment
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Re: Cross reference for B90N08
BTW, that power MOSFET is for the Boost converter circuit to step up the Voltage for the LED Backlights.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: Cross reference for B90N08
ThanksComment
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Re: Cross reference for B90N08
So should I follow dick Barton recommendation or I need different one?Comment
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Re: Cross reference for B90N08
If that mosfet was short circuit then it may also have damaged U1. I would also check the resistors around U1 are all still the correct value and not damaged.
Edit
What is the part number written on U1Last edited by dick_barton; 08-25-2016, 03:09 AM.Willing to help but I'm no expert.Comment
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Re: Cross reference for B90N08
matter effect, you would have to check the whole gate drive circuit.Comment
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Re: Cross reference for B90N08
The marking on U1 Is OB3362HPComment
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Re: Cross reference for B90N08
Received FDD3570-ND and installed. Getting green light on the monitor power button indicator, but still no picture. Any more suggestions.Comment
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Re: Cross reference for B90N08
I would think the OB3362 four string LED driver IC could also be blown, always best to replaced as a pair with mosfet, and check current limiting resistors as Dick suggestsComment
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Re: Cross reference for B90N08
with board removed and plugged to 120V I am getting 5V to both 5V pins to ground in and no voltages on ENA or ADJ pins to ground.Comment
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Hi:
I have what it might seem a zener diode. It's marked as E57, but I haven't found any reference that might match my observations.
I've took one from the same circuit and tested isolated with the power supply and a 1k resistor. with 10V, the possible zener stays at 6.6V.
It seems a SOD123 package. It measures (2.6mm x 1.6 mm).
Any idea? it's a 6.6V zener?
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Hi,
I'm getting some conflicting information and thought I'd toss it out to all of you for input.
What I have is a TTC-104 thermistor. This is part of a temp sense circuit that will drive a small 12v fan to cool components mounted to SMPS heat sink.
The physical diameter of the piece is 5.1mm measured with a caliper.
Other than what you see in the pic, there is no other writing on the part.
My research of the TTC-104 says it should read 100 ohms at 25C. Out of circuit measurements have it at approximately 100k. It does change as the temp changes.... -
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Im not sure where to find the ipad board number. Anybody have an idea where else this diode is used on other boards? Thanks.... -
Hello everyone, I'm repairing an LG TV backlight and I noticed some strange behavior when I touching the backlight strip with a missing Zener diode.
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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Hello everybody☺️ I am glad to be here and looking forward to a good discussion.
First of all, I am new here. Therefore I will shortly introduce myself.
I am Nico and currently I study Physics.
In my freetime I like to build and repair stuff. Especially big battery's.
A few years ago I got myself an electric unicycle, monowheel or however you call that.
The battery bms was broken so I replaced and resolder that. Nothing big.
I used this thing for some years and had a lot of fun. Unfortunately I used it last time in heavy rain. Usually everything...
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