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Old 08-13-2012, 12:45 AM   #1
zombslayer
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Default magnavox 37mf337b/37 parts advice

Hi! I am a new member and love the site! Thanks for all of the information, very helpful!!

I have a MAGNAVOX Model:37mf337b/37 that currently has the squeak/squeal going on. The Stock CapXon Caps are currently present in the t.v. @ a rating of 1000uf 35v.The three caps will need replacing due to bulging, also I tested the Diodes and found that two need replaced:

ZD902 (KE12 74) tested at .017 and .017, D912 (RD) tested at .001 and .001 while installed to PSU.

What brand of caps should be used?
What are the correct diodes that I will need?
Part #'s, Brands, any advice would be helpful.

I can be more specific if necessary, Thanks again!!
Attached Images
File Type: jpg PSU.jpg (59.3 KB, 49 views)
File Type: jpg PSU1.jpg (192.5 KB, 51 views)
File Type: jpg PSU2.jpg (217.4 KB, 42 views)
File Type: jpg PSU3.jpg (198.4 KB, 46 views)
File Type: jpg PSU4.jpg (208.1 KB, 43 views)
File Type: jpg PSU5.jpg (249.0 KB, 34 views)

Last edited by zombslayer; 08-13-2012 at 01:51 AM.. Reason: PIC
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Old 08-13-2012, 12:48 AM   #2
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Default Re: magnavox 37mf337b/37 parts advice

These are suggested:-

http://www.digikey.com/product-detai...445-ND/2433579

+ shipping about 3 bucks

Panasonic FR - low ESR, high ripple current, very long lifespan.

Just check the diameter (12.5mm x 20mm) will fit.

The diodes - I believe UF4007 is tossed around here - http://www.digikey.com/product-detai...ICT-ND/3340246
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Old 08-13-2012, 12:52 AM   #3
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Default Re: magnavox 37mf337b/37 parts advice

Thank You! for such a quick response! I will be sure to check diameter.
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Old 08-13-2012, 07:38 AM   #4
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Default Re: magnavox 37mf337b/37 parts advice

Isn't ZD mean zener diode?
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Old 08-13-2012, 11:30 AM   #5
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Default Re: magnavox 37mf337b/37 parts advice

Hello! Yes, from what i understand ZD is zener diode. So does anyone know which ZD I will need? I will be ordering the parts described as above, but would like to make sure that I have a regular diode and a zener diode.
Thanks again!!
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Old 08-13-2012, 11:38 AM   #6
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Default Re: magnavox 37mf337b/37 parts advice

Quote:
Originally Posted by zombslayer View Post
Hello! Yes, from what i understand ZD is zener diode. So does anyone know which ZD I will need? I will be ordering the parts described as above, but would like to make sure that I have a regular diode and a zener diode.
Thanks again!!
I dont understand what you are asking - you have the board there what are the part numbers of the parts you want- is the part number you originally quoted not the number off ZD902 " ZD902 (KE12 74)" Is that not correct?

Test them again off the board.
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Old 08-13-2012, 11:48 AM   #7
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Default Re: magnavox 37mf337b/37 parts advice

I will retest out of board and report my results. I am needing a KE12 74 , which is ZD902. I was just making sure I do not replace a ZD w/a regular diode.. I am not sure if uf4007 would be good for both faulty diodes.
Thanks for the quick responses, this site is amazing!!
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Old 08-13-2012, 11:54 AM   #8
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Default Re: magnavox 37mf337b/37 parts advice

You can always check by looking at the data sheets for the part numbers.
Even if you dont fully understand them ( I dont) you can usually get enough
info for basic comparison. Just google the part number and download the data sheet ( Pdf file)
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Old 08-13-2012, 12:02 PM   #9
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Default Re: magnavox 37mf337b/37 parts advice

I will do that! When I do find the info. I will be sure to pass it on. I will keep this thread open and update my progress. I am pretty good with electronics, this is my first tv and is a good learning experience.
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Old 08-13-2012, 12:20 PM   #10
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Default Re: magnavox 37mf337b/37 parts advice

Is there a chassis number on the model number sticker?
Pleas remove that zener diode, it should have number with PKEXXXX on it, it is Zener Diode for the snubber circuits, will be in 200V range.
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Last edited by budm; 08-13-2012 at 12:30 PM..
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Old 08-13-2012, 12:36 PM   #11
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Default Re: magnavox 37mf337b/37 parts advice

PSU # is 715T2484-4, there is a barcode also on PSU with ADPF24220R1P/P5PB74752533 as I am not sure what those numbers stand for. The back of the tv its self has model# and serial #.
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Old 08-13-2012, 12:39 PM   #12
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Default Re: magnavox 37mf337b/37 parts advice

Most PHILIPS/MANAVOX TV's have chassi number printed on the model number sticker to tell the service technician which chassis being used inside the TV since same model can have more than one version of the chassis. Any number on that PKE ZENER Diode?
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Old 08-13-2012, 12:45 PM   #13
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Default Re: magnavox 37mf337b/37 parts advice

"Any number on that PKE ZENER Diode?"
Thought he has already said twice it is a KE1274
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Old 08-13-2012, 12:49 PM   #14
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Default Re: magnavox 37mf337b/37 parts advice

From the picture, I can see KE2XXX. I do not see KE12XX. I expect it to be P6KE2XXX. I expect it to be 200v Zener.
His circuit may be similar to this one. I need to find the chassis number to look up the service manual.
http://www.mouser.com/ProductDetail/...k9x0jN%252bFfF

Last edited by budm; 08-13-2012 at 12:57 PM..
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Old 08-13-2012, 01:10 PM   #15
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Default Re: magnavox 37mf337b/37 parts advice

ZD902 is p6ke120a/744, now that i do see it. I am guessing i should replace with a P6ke120a? Thanks.
Diode tester reveals .019 and .019 out of PSU.

Last edited by zombslayer; 08-13-2012 at 01:20 PM.. Reason: info.
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Old 08-13-2012, 01:38 PM   #16
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Default Re: magnavox 37mf337b/37 parts advice

Digikey:
http://www.digikey.com/product-detai...ACT-ND/2770358

That is pretty low voltage rating for Snubber.
The other Diode D912 more likely to be UF4007, but take it out of the circuit to check and get the number off the body.
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Old 08-13-2012, 01:50 PM   #17
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Default Re: magnavox 37mf337b/37 parts advice

I will definitely take D912 out,confirm the body numbers and diode test . I really appreciate all the input, I could not have done it without BADCAPS!! Thanks for the schematics as well VERY HANDY thing to have.
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Old 08-13-2012, 01:52 PM   #18
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Default Re: magnavox 37mf337b/37 parts advice

The diagram I post is not the exact as your power supply, but it shows how the Diodes are used.
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Old 08-13-2012, 02:01 PM   #19
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Default Re: magnavox 37mf337b/37 parts advice

I will search for the chassis number, I am interested in that now. The diagram is great in showing how the diodes are used, very interesting stuff.
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Old 08-13-2012, 02:38 PM   #20
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Default Re: magnavox 37mf337b/37 parts advice

Make sure you are keeping a written record where all these parts of coming from on the board. You sometimes get so many you forget from time to time. I also like to take a picture of the board before I start taking parts off of it.
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