Re: magnavox 37mf321d/37 powering on problems
It used to have an audible hiss coming through the speakers when the TV was on, now that hiss is non-existent. Also, when switching between the various AV ports and the HDMI port, and back to the tuner, it seems to take less time to do so than with the old board. Clearly there was something wrong with the original board that was jamming it up a bit before it completely locked itself up and rendered the TV useless....
fixerofthings
Member
Last Activity: 07-01-2014, 06:40 PM
Joined: 06-07-2014
Location: Salem, NH
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Re: magnavox 37mf321d/37 powering on problems
Ok...I got all the boards in today. Replaced them one by one. No change, until.........I replaced the main/scaler board. Now it works as it should. So the issue THIS time was the main board. No idea what happened to it or why it failed, but the replacement board seems to work better than the original used to.
So with that said, I have listed the T-con board, the Inverter board, the PSU board, and the IR board that I purchased on ebay to try and recoup some $$ that I invested into this thing. Hopefully it lasts a lot longer...Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
I haven't ruled out the main board yet. Waiting for the replacement to come in. I have ruled out the PSU and the Inverter board and the IR board. But as I said, the replacement main board was a package deal for both a main board and an inverter board, so I'll double check the inverter board with that one as well.
As I said in the original post, the tv will not turn on using the remote control, nor does the green indicator light at the power button come on anymore. Also when trying to power it on using...Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
My plan is, once I determine which board is the faulty one, the others will get re-sold to recoup my investment. The PSU board I got was for a fraction of what they seem to be going for, so no worries on recouping that. Also, the package deal price for the Inverter and Main boards was less than the price of what people are getting for the main boards themselves! So, any way I look at it, this will be a win-win situation once the tv is working again.
Once I determine which board is the faulty one, it will get...Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
Yes, this is what I said.
The LCD panel was an NOS replacement which came with a T-con board and an Inverter board. I originally installed it as is, but found that the T-con board that came with the NOS panel had an issue, so I replaced it with the "known good one" that was on the set's original LCD panel. I was replacing the original panel due to some kind of physical damage that occurred to the screen during a prior move.
So, the current T-con board is the original T-con board...Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
The T-con board is a separate board from the main board. The new screen came with a new inverter board and a new T-con board, but the new T-con board was bad.....I would get sound, but the only picture I got at the time was 4 broad vertical colored stripes. I swapped in the old T-con board from the old damaged screen and things were fine for about a month until the current issue came up. The new T-con board that was bad still allowed the TV to turn on, so not so sure the issue is with the T-con board. I've done some searching...Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
I did swap the inverter board before, but this was a package deal through ebay. I didn't have much choice but to take the package as it was with both boards. Worst case is I have yet another extra or can resell it if it does the same thing as the other spare and original I have. The price for the two boards together was far cheaper than what I've seen the scaler board go for by itself on ebay and other sites....Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
Decided to give it another try at getting this beast working again. I was 99.9% sure that the PSU board was fine, but got a killer steal, I mean deal, on a reconditioned one. So after listening to another member on here that seemed to think that it still could be my PSU board that I repaired last year, I went for it.
Just replaced it, and...............nope. Same problem. So.....with that said, I did some searching and found a "tested known good, guaranteed" inverter board and a similar condition scaler/main...Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
The IR board came in today, and............
same issue. Rechecked the cable again, etc. I'm at a loss and really don't want to spend any more on this TV. I may consider parting it out.
Any LOCALLY interested parties, let me know.Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
I'll double check the cable, thanks for your input....Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
Like I said, it seems it one of the top 4 in demand parts for this model tv....this board, the power button itself, the PSU board, and the scaler board for the other model screen (which I don't have in mine)......
I'm going to give it a shot and see if it changes anything....Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
There are two momentary switches that sit on either side of the main indicator LED, the IR sensor for the remote, the connector for the ribbon cable, and a few resistors that I can see. I did double check the ribbon cable that feeds this board, and that seems to check out ok, no breaks, shorts, etc.
For the cost of the board assembly, I think its easier to replace it than to try fixing it. Here's a link to the part in question, pics below as well: [URL="http://www.encompassparts.com/item/6851428/...Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
I found that Encompass, the site that sells factory replacement parts for Phillips and Magnavox lists the IR board, the power button (the actual button, not the electronic switch), the PSU board, and the Main/Scaler board as the top 4 in-demand components for this model tv. I think for the $2.60 they want for a NEW IR board, I'm going to take a chance and try that.
It just seems odd to me that the LED will not light, the IR won't recognize the remote control and the power button doesn't seem to do much of anything anymore,...Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
The power on button is part of the IR board.
Also, the caps that I purchased were USA made Sprague brand caps of the exact same values as what the originals were marked at. Got them from mouser. I didn't "skimp" when it came time to replacing them. I highly doubt that the caps are bad on the board 6 months later, since all the voltage values on the output pins of the PSU meet the specs shown in the service manual and are not fluctuating.
The problem did not become a gradually worse thing...Last edited by fixerofthings; 06-08-2014, 05:42 AM.Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
I have a spare backlight inverter board, known good as it worked fine with the old screen. I swapped it in and there was no change with the condition.
The green LED is supposed to dimly glow when in standby mode and brightly glow when the tv is powered up and on. It does neither at the moment....Leave a comment:
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Re: magnavox 37mf321d/37 powering on problems
I checked voltages using a meter as I do not own a scope. The caps are not "ruptured", meaning no goo coming out of them. The green LED is not lit on either standby mode or "on" mode, totally inop.Leave a comment:
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magnavox 37mf321d/37 powering on problems
Hello all, I've done some searching on the forum for some help, found one possible thread with a similar condition to what my particular tv is doing, but I don't think its 100% the same thing.
Anyway, here's what it does: No green LED power light glowing at all, remote will not function at all (it was working fine and new batteries installed just in case), but if you use the power button on the front of the tv it will try to power up. The backlight comes on fully once, then shuts off, tries to turn on again with 3 or 4 quick flashes, then nothing. It repeats this when pushing the...Last edited by fixerofthings; 06-07-2014, 06:01 AM. -
Re: New Members - please post your introductions here
New member here from New Hampshire USA. I'm no electronics guru that's for sure. I know enough about electronics to be "dangerous" as they say. LOL!
Pretty much here hoping that I can get some info on how to get my older Magnavox 37" LCD tv going again. I've already done the power supply board recap and replaced 2 of the MOSFET chips that seemed faulty on that board about a year ago, but now its acting up again.
I'll do some searching before I throw the main question out there....Leave a comment:
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