Re: Magnavox 42" LCD no Power
I get the same ohms no mater which end I put the pos and neg. I think you talking about 6075 I can't find and 6079. With the diode checker on the dmm I get a 698 reading.
jbpest
Member
Last Activity: 12-10-2018, 03:57 PM
Joined: 11-08-2010
Location: Mineral Wells, TX
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Re: Magnavox 42" LCD no Power
Hey did I lose you guys? I have been checking the power supply and I get some funny reading from what I can tell. I think my problem is there but I don't think its a cap.Leave a comment:
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Re: Magnavox 42" LCD no Power
More pics of the cap on the scaler board.
[ATTACH]20385[/ATTACH]
[ATTACH]20386[/ATTACH]
Again this cap was loose and I put it back but it could be the wrong pin not sure. 7 and 8 are correct but not sure about 5 or should it have been 6.Re: Magnavox 42" LCD no Power
More pics of the cap on the scaler board.
[ATTACH]20385[/ATTACH]
[ATTACH]20386[/ATTACH]
Again this cap was loose and I put it back but it could be the wrong pin not sure. 7 and 8 are correct but not sure...Leave a comment:
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Re: Magnavox 42" LCD no Power
Here are pictures of the inverter boards.
[ATTACH]20375[/ATTACH]
[ATTACH]20376[/ATTACH]Re: Magnavox 42" LCD no Power
Here are pictures of the inverter boards.
[ATTACH]20375[/ATTACH]
[ATTACH]20376[/ATTACH]...Leave a comment:
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Re: Magnavox 42" LCD no Power
I'll get the inverter pictures hopeful later today but first when I removed the glue this cap was disconnected. I tried to reconnect it where I thought it goes but I'm not sure I put it to the right pin. These are the pics of the cap and the schematic for the position. It was still connected to pins 7and 8 I reconnected it to pin 5 but it could have been pin 6. I can't tell[ATTACH]20348[/ATTACH]
[ATTACH]20349[/ATTACH]Re: Magnavox 42" LCD no Power
I'll get the inverter pictures hopeful later today but first when...Leave a comment:
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Re: Magnavox 42" LCD no Power
Ok, I got the 2200uf 25v in and installed. I still have no power at the on off switch and 2074 to ground is still reading 16 even with the new cap.Leave a comment:
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Re: Magnavox 42" LCD no Power
Yes, thats the same as mine and with 5 mounting holes.Leave a comment:
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Re: Magnavox 42" LCD no Power
I can't find the part number but I think this one on ebay will work.
[url]http://cgi.ebay.com/Speaker-bar-Magnavox-42MF437B-37-/270661991190?pt=Televisions&hash=item3f04b63b16[/url]Re: Magnavox 42" LCD no Power<br /> ...04b63b16[/url]Leave a comment:
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Re: Magnavox 42" LCD no Power
The fact you got the same board in and are in the same forum helping me its a Blessing from God. I must be living right. I've ordered the 2200uf and should have it in in a few days. Thank youLeave a comment:
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Re: Magnavox 42" LCD no Power
I replaced all the caps with 1500uf 35v. The one lone cap 2200uf 25v is at 2074. I may have bought the wrong cap for that positions.Leave a comment:
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Re: Magnavox 42" LCD no Power
What was the location of the 2200uf 25v. I had 4 1500uf 25v on this board or so I thought.Leave a comment:
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Re: Magnavox 42" LCD no Power
No not that I can tell.Leave a comment:
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Re: Magnavox 42" LCD no Power
I checked the solder joints they seem to be fine but I reheated and made sure they were fine.
at the 2074 or DC2 I get a reading of 16 on the positive side of the cap to the ground.Leave a comment:
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Re: Magnavox 42" LCD no Power
I'll check the solder joints to see if that fixes the problems.Leave a comment:
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Re: Magnavox 42" LCD no Power
Ok maybe I'm figuring this out. I was using an old AMM I have now bought a DMM and hopefully I'm on the same page as you guys.
Thank you for the patients.
at point A and B on the DMM the reading is 173
DC in is 173
PFC Out is 173
DC1 is 24
DC2 is 0
DC2 is at location 2074 and had a very bad cap that I replaced. Does this mean I replaced a bad cap with a bad cap?Leave a comment:
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Re: Magnavox 42" LCD no Power
I checked the fuse on the processor board and its fine.Leave a comment:
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Re: Magnavox 42" LCD no Power
Ok, I just figured out that the DMM had a blown fuse in it. I have changed the fuse and here are the new readings again I'm sorry about that.
1. at point A. the reading is 75DC.
2. at point B. the reading is 75DC.
Agin sorry about that PlainBill didn't realize what was going on until I couldn't get a reading on anything but Ohms.Leave a comment:
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Re: Magnavox 42" LCD no Power
I set the DMM to the lowest resistance range and the meter reads 1 ohm when shorted and it reads 1ohm across the fuse. I don't think the fuse is the problem. I'm not sure the power is ever getting to the fuse.Leave a comment:
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Re: Magnavox 42" LCD no Power
Ok here are the pictures of the display board. I know that the power switch plugs into this board.
Also the IC has TEA1507p, N6E9M7, 6E07912, HN6391. I'm not sure which one is the part number.
The ohms from the fuse to the IC is 1k.
Sorry I missed that earlier....Leave a comment:
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Re: Magnavox 42" LCD no Power
I set the meter at DC V 500
1. Ok at point A the reading was 0 it never moved.
2. Point B the reading was 0 it still never moved.
I unpluged it and at the fuse the ohmmeter read a little over 1. The fuse is a 250v 5amp ceramic.
The Capacitors are 1500uf 35v GXE 96e2.
Thank you for the help. I sure appreciate it!!!!Leave a comment:
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