Ok so I have a smd fuse 3a on a main board I have that needs to be replaced. I don't have any extra ones but I do have a 5a laying around. Would it really be that bad to put the 5a in place of the 3a. Or do I need to order a 3a.
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Re: Smd fuse replacement
As long as everything works fine you can even put in a 200A fuse. Or a nail. :-)
I would always avoid replacing them with others having higher current rating. -
Re: Smd fuse replacement
Haha. I might just do it anyway. I'm hoping it will fix the problem w/ the main board.Comment
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Re: Smd fuse replacement
I have seen various warnings in tv's, home electricity, and car fuses that you should always replace the fuse with the same type/amperage.Comment
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Re: Smd fuse replacement
Yea it still didn't fix the problem. I'm almost completely exhausted on this tv. I checked all fuses for voltage. All caps good. All points on power board getting correct voltage. I have no idea where to go one this one. The heat shield on the main board still gets kinda warm. Not so warm it burns but enough to notice. The tv is a m550nv vizio that when plugged it logo flashes for a while then goes to stand by. U turn it on and the backlight turns on but no picture on screen. If u hit the power button to turn on menu the screen dims but no image.Comment
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Re: Smd fuse replacement
Ok, so something draws too much current. You don't happen to have access to infrared camera?Comment
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Re: Smd fuse replacement
No I don't. Left it in my other spy bag. Lol jk. But originally I had to replace a melted capacitor that was underneath side of the main board next to where the heat shield would be.Comment
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Re: Smd fuse replacement
Do you have the service manual, schematic? Do you have an oscilloscope?Comment
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Re: Smd fuse replacement
I dot think they have a service manual for it. And I only have a dmmComment
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Re: Smd fuse replacement
Can you post a pic of the region where u said you replaced a melted cap?Comment
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Re: Smd fuse replacement
KAttached FilesComment
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Re: Smd fuse replacement
Here's anotherAttached FilesComment
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Re: Smd fuse replacement
This was before I replaced the smd capAttached FilesComment
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Re: Smd fuse replacement
I don't know what it was connected to but the last picture showed the plastic part melted down. So I replaced it but did a real bad solder job.Comment
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Re: Smd fuse replacement
The cap on the last picture has very likely not been mounted like this in factory. Somebody replaced it already. Was it shorted?
You can determine what it is connected to when you follow the traces back to the power supply. I assume it to be on GND on one side and on 3V3 or %V on the other side.Comment
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Re: Smd fuse replacement
I wasn't sure. I don't have the board infront of me right now. Before I replaced the cap the tv wouldn't even power on or have the logo light up. And after I replaced it it will turn on but no image.Comment
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Re: Smd fuse replacement
Measure the voltage on that cap. Multimeter first DC, then AC. Post the results.
If possible get a scope borrowed from someone.Comment
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Re: Smd fuse replacement
KComment
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Power supply board BN44-00618A keeps blowing main fuse and nothing plugged in to it.
I was gifted a 64PN5500AF, picture was amazing, but tv smelled like cigarettes and was dusty AF. I opened it up, blew all the dust out of it, removed PSB & main, and cleaned the metal underneath. Also blew all the dust off all other boards. Put the power supply back in, then mainboard. Soon as I turned it on there was a "pop".
The main fuse (T12AH250V) blew
I removed the power supply to be sure nothing underneath, all good. Soldered on a t12ah250v fuse and sure enough it popped... -
Hi folks,
I'm new to this forum. So my trusty 17-year-old LG 47" LCD recently died. As I was booting it up, I heard a hum followed by a loud bang, sounds of pieces flying around, and loss of power to the unit. Inspecting the PSU, I saw two obvious problems: a blown thermistor (bang + flung pieces) and a visibly bulging main cap. Inspecting as many components as I could with my Fluke MM, I diagnosed that the following components on the "hot side" of the board were also bad: one of the 2 main MOSFETs, main 8A fuse, small cap (25V 47uF) connected to main caps, and a blown... -
Hi,
I have a GIGABYTE Windforce 980TI with a blown fuse. I have already found the root cause for the fuse blowing.
I need help getting a replacement fuse - I'm fine with waiting some time for some cheap ones from China.
The fuse says 10A on it. And I'm not sure what package size it is exactly. Also, how do I know if it is a fast or slow fuse?
...04-11-2022, 09:01 AM -
Hi all,
Need some advice to troubleshoot this TV.
PSU blow the main fuse F100, 3.15A.
I replace the fuse with another 3A (but not ceramic) and blows it again after few seconds when i plugged in to the wall, with nothing connected to PSU, just the power cord.
I checked with DMM for dead sorts but didn't found any.
Checked bridge rectifier and seems ok.
Also check main filter cap with transistor / cap / esr tester (the usual cheap transistor testers from ebay) and found ok.
PSU p/n is EAX64405901 (1.6)... -
I suppose the real question is whether the existing pinouts from ether a 17IPS71 psu are cross compatible with a 17IPS12 psu? If they are then the exchange of the main boards should have no issues providing the screen is compatible with both main boards. Obviously you can change the screen configurations easily enough (providing you have the correct files) for the main board. Why may you ask would I do this? Well a lot of the smart features are no longer working on a Hitachi 48HBT62U main board I wish to give it a new lease of life!
Obviously the same LVDS connector for the screen connection...
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