Re: Magnavox 32MF301B/F7 blowing fuses
This is the model tag. Am I missing something?
[ATTACH]61917[/ATTACH]
Yikes, that thread is not promising. I read through the first page. It looks like I might be replacing a lot of stuff if I want this working.
When I have time I'll finish reading through it, do some more testing and report back. Thanks a lot of all the help, everyone.Re: Magnavox 32MF301B/F7 blowing fuses
This is the model tag. Am I missing something?
[ATTACH]61917[/ATTACH]...
HittingSmoke
New Member
Last Activity: 04-12-2013, 08:42 PM
Joined: 04-11-2013
Location: Seattle
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Re: Magnavox 32MF301B/F7 blowing fuses
Is that the /F7 in the model number? That's the only thing I can see which resembles what you're describing....Leave a comment:
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Re: Magnavox 32MF301B/F7 blowing fuses
Well damn. It appears all four of those diodes are shorted. 0.55V going both directions on all of them.
If I'm reading the caps correctly they're shorted as well. Both are a steady 1.8 ohms. They should climb in resistance if they're good, no? I also did the capacitance test using the setting designed for it on my meter and it reports they do not charge.
Given so many failed parts it's probably safe to assume there are more? I left this out in the OP but now I feel I should note, these fuses did...Leave a comment:
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Re: Magnavox 32MF301B/F7 blowing fuses
[URL="http://i.imgur.com/3mtXZUz.jpg?1"]Am I correct in assuming this chip is the bridge rectifier?[/URL] I found a tutorial for testing them but I'm not certain exactly where it is.
[ATTACH]61914[/ATTACH]
I have two large caps and if I'm using my meter correctly, it says they're both bad. According to the capacitance test outlined in my manual the caps aren't charging at all.
EDIT: Uploaded the picture in an attachment. I can't find anything on this PCB that looks like a bridge...Last edited by HittingSmoke; 04-12-2013, 04:55 PM.Leave a comment:
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Re: Magnavox 32MF301B/F7 blowing fuses
Readings on the PCB are pretty much what they were before removing the MOSFET. 2-3 is 1.8 ohms.
I believe it's 0.18Ω 5% but I'm colorblind so I may not be getting the colors perfect. [URL="http://i.imgur.com/RvHwM0w.jpg"]I dug out a better camera and got a macro shot of the resistor.[/URL] I'm not certain if the first one is red or brown. I can get better shots of anything needed now as well.Re: Magnavox 32MF301B/F7 blowing fuses
Readings on the PCB are pretty much...Last edited by HittingSmoke; 04-12-2013, 03:53 PM.Leave a comment:
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Re: Magnavox 32MF301B/F7 blowing fuses
Reading are very different after desoldering. 2-3 is 340K. 1-2 and 1-3 both read OL.
I did some arbitrary measuring of resistors around the MOSFET and I think at least one of them is shorted as well. [URL="http://i.imgur.com/c5hIYre.jpg?1"]The resistor circled here right behind the MOSFET heat sync is reading 0.5 ohms.[/URL]Re: Magnavox 32MF301B/F7 blowing fuses
Reading are very different after desoldering. 2-3 is 340K. 1-2 and 1-3 both read OL.
...Last edited by HittingSmoke; 04-12-2013, 02:51 PM.Leave a comment:
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Re: Magnavox 32MF301B/F7 blowing fuses
Ahh, yes, sorry. It's 405.9 k and 405.6 k. The 1.8 reading is just ohms and it seems to fluctuate between 1.6 and 4ish.
So it needs to be replaced. Is this something I can pick up at Radio Shack or do I need to order a specific matching part?...Leave a comment:
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Magnavox 32MF301B/F7 blowing fuses
My GF's parents were going to throw away this TV claiming it was fried by a power surge. I decided to bring it home and see if it was just a blown fuse.
I changed out the 125V/4A fuse and it immediately blew as soon as I plugged the power in.
Here are some pictures of the power supply. Sorry for the picture quality. The flash washed it out too much so I had to use HDR mode. My hands aren't quite steady enough for it:
[url]http://imgur.com/a/ho0li[/url] (The first image appears currupted but if you open the full resolution version it shows up properly)...
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