This is an LED monitor with a non-functional backlight. It has an external power supply. The board had three surface mount caps with white powder on them. I've never seen these types of caps go bad and as such assumes they were the problem. I replaced them with through-hold caps but the problem persists. The monitor does work as I can clearly see an active image.
Looking at the board, I'm lost. I've verified 3.3V at the control panel connector CN402. I have nothing at all off CN801 - the LED output connector.
I was looking for a fuse or something else that might jump...
MdPhoenix
Senior Member
Last Activity: 04-10-2022, 02:01 PM
Joined: 05-11-2010
Location: Forest Hill, MD
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Re: Philips Magnavox 32MF338B/27
Got one of the Ebay boards. Showed up in beautiful condition. The TV works flawlessly now. Thanks for the assistance all! -
Re: Philips Magnavox 32MF338B/27
I saw both of these. I'm concerned about the second one. The cable wraps over where the 4 large diodes are. It's difficult to tell if it's burned as mine is, or not....Leave a comment:
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Re: Philips Magnavox 32MF338B/27
Fair enough. I have a big enough basement. I'm convinced!Leave a comment:
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Re: Philips Magnavox 32MF338B/27
If I knew it were going to last a few years, I wouldn't feel so bad. I don't wanna repair it, sell it, then have someone else end up with junk. And going even further, most people will just throw it out instead of properly recycling it. I'd hate for it to end up in a landfill. Maybe I'll fix it and stick it in my bedroom to use it until it dies again.Leave a comment:
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Re: Philips Magnavox 32MF338B/27
I considered that as well. But how long before it happens again?Leave a comment:
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Re: Philips Magnavox 32MF338B/27
Thanks, all. The same answer from 3 or 4 people on this site is good enough for me. I'll just rape the board for anything useful and recycle the TV.
Thanks again!Leave a comment:
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Re: Philips Magnavox 32MF338B/27
Bumparoonie!Leave a comment:
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Re: Philips Magnavox 32MF338B/27
From a time vs money standpoint, no, I suppose it isn't. I'm hoping to learn something from this as well, though. Hopefully someone can guide me.
Believe me, simply buying a board has crossed my mind a few times.Leave a comment:
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Re: Philips Magnavox 32MF338B/27
Bump for great justice.Leave a comment:
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Philips Magnavox 32MF338B/27
There is another thread about the same problem here: [url]https://www.badcaps.net/forum/showthread.php?t=24611&highlight=32mf338b%2F27[/url]
The conclusion was that the power supply/inverter board needed to be replaced. There wasn't much participation in that thread and as such I'm hoping to glean more about this problem here.
The unit tries to turn on. Power blinks green several times, then it goes to red standby.
Detailed pics of the board are attached.
There are burn marks on the board which correspond to the 22N055s on the solder... -
Re: LG 32LX1D will not turn on
Yup. It was. But getting to it was educational.Leave a comment:
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Re: LG 32LX1D will not turn on
Yeah man. Pretty awesome. I fix monitors with blown caps a lot. But hunting down something like the good ole days - that's something special. I've got another TV somewhere around here. I'll start another thread for it.
Thanks again!Leave a comment:
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Re: LG 32LX1D will not turn on
BOOYA! All fixed guys! I can't thank you enough! Free TV on Craigslist, some talented individuals, a tiny replacement part, and now my kids have a decent TV for their game room.
Thanks so much again!Leave a comment:
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Re: LG 32LX1D will not turn on
Awesome. Consider that guy replaced tonight.
And duh. Electrolytic Cap = DC. hurrr.
I used to be good at this stuff in High School. I just kinda strayed. Need to get back into it.
Thanks for the help. Stay tuned.Leave a comment:
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Re: LG 32LX1D will not turn on
I assume when you want the 5v rail resistance measured, we're talking from ground to the 5v standby? From a ground pin, to standby I get a slow build up in resistance. It stops at 9.3k.
I didn't ask if AC or DC across gigantocap. I can't tell if it's before or after the rectifier. Anyway, I get 157DC. Nothing on AC.Leave a comment:
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Re: LG 32LX1D will not turn on
The 5V standby is fluctuating between about 2.69vdc and 2.84 vdc with nothing connected to the PSU.
And I get nothing when I try to pull the PWR_CTRL1 high or low. Of course, I'm not sure where to get 5V to pull it high. I tried using the 2.8 from the standby. Silly? Probably. Wasn't sure what else to do.
I don't know if this helps, but I poked around a bit. Trying to see what voltages I could get. I get either 68 or 75 VDC on the high voltage side of PC102, PC103, and PC104. I'll keep checking things and try not to kill myself.Last edited by MdPhoenix; 08-08-2013, 07:53 PM.Leave a comment:
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Re: LG 32LX1D will not turn on
Nice. Thanks all! I'll check these out tonight!Leave a comment:
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Re: LG 32LX1D will not turn on
Any help?
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Re: LG 32LX1D will not turn on
Pics!!!!...Leave a comment:
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