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Magnavox 32MF231D black screen    
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imranh101



Joined: 24 Sep 2011
Posts: 4

PostPosted: Sat Sep 24, 2011 8:46 am    Post subject: Magnavox 32MF231D black screen Reply with quote

Hey guys, I just got this TV on craigslist for free.
Upon powering on, the green light comes on as if it's working fine, but no display AT ALL, it's not just backlight out.
I opened it up and looked at it, all caps look fine, and all connections look secure, nothing shorting out.
I see small Surface Mount LEDs lighting up on a side board, the power supply board, and the main logic board, so the power is getting ditributed fine (I think?) I have literally quadruple checked all the caps looking for a bad one, they all look fine!

What am I missing? Really want this thing to work; a free 32" lcd will be nice Smile
Thanks in advance.
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JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Sat Sep 24, 2011 5:01 pm    Post subject: Reply with quote

Did (insert the name of your higher power here) issue you the "Special" eyes/glasses that will detect the actually defective (but "looks" good) electrolytics?

By the way, what's "ditributed?" (?angry power?)
imranh101



Joined: 24 Sep 2011
Posts: 4

PostPosted: Sat Sep 24, 2011 5:28 pm    Post subject: Reply with quote

JTS1957 wrote:
Did (insert the name of your higher power here) issue you the "Special" eyes/glasses that will detect the actually defective (but "looks" good) electrolytics?

By the way, what's "ditributed?" (?angry power?)


No, but none of them show any of the signs of a bad capacitor.

And I think you know that that was a simple typo of the word distributed. Sorry I missed a letter and that destroyed your entire train of thought...

Edit: That was your post #1234. Interesting fact.
JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Sat Sep 24, 2011 5:40 pm    Post subject: Reply with quote

You HAVE measured each for (at least) "value" and "ESR" (Equiv. Series Resistance)?

Now I'm at 1235.


Last edited by JTS1957 on Sat Sep 24, 2011 5:44 pm; edited 1 time in total
imranh101



Joined: 24 Sep 2011
Posts: 4

PostPosted: Sat Sep 24, 2011 5:42 pm    Post subject: Reply with quote

Nope, zapped my multimeter earlier by mistake. How can I do this? I always have a spare analog multimeter somewhere.

Thanks for response.
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JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Sat Sep 24, 2011 5:49 pm    Post subject: Reply with quote

Try replacing capacitors 2080 & 2079 (1200ufd@35v) 2068 (22ufd@25v) and 2086 (2.2ufd@50v) in the power supply.

That's 1236.
imranh101



Joined: 24 Sep 2011
Posts: 4

PostPosted: Sat Sep 24, 2011 6:14 pm    Post subject: Reply with quote

Can these caps be found in radioshack?
JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Sat Sep 24, 2011 6:43 pm    Post subject: Reply with quote

Don't know. I haven't set foot in a RatShack since the early 90's.
kuhurdler



Joined: 28 Dec 2006
Posts: 2862
Location: Overland Park, KS

PostPosted: Sun Sep 25, 2011 7:41 pm    Post subject: Reply with quote

My radio shack only sells cell phones, batteries, and satellite receivers.
caps can be ordered from mouser.com or digikey.com for quite cheap if your radio shack doesn't sell them.
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