Please assist, magnavox LCD BLACK.....


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Please assist, magnavox LCD BLACK.....

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sdavis
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Nov 15, 2011, 9:00 PM

Post #1 of 9 (1905 views)
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Please assist, magnavox LCD BLACK.....	Can't Post

i have a magnavox model 42MD459B it is approx 1 1/2 yrs old. first and foremost this occured 1 week after 1 yr parts warranty expired......so be cautious.

42" magnavox lcd/ blu ray
model# 42MD459B
sn# YA2A0936011466
DOP 06/2010

everything sounds perfect, however there is no picture what so ever. no menu display nothing.. everything remains black, however i can hear it and changed channels. keep in mind i cant see what channel im changing it to. i was told i need a new panel, which i find are obsolete.... is it possible something heated up on a board and melted a solder?????????

please assist. greatly appreciated.

jts1957
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Nov 16, 2011, 12:48 AM

Post #2 of 9 (1897 views)
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Re: [sdavis] Please assist, magnavox LCD BLACK..... [In reply to]	Can't Post

Shine a flashlight close to screen and look for any trace of video.

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Location: Far, Far Away

sdavis
New User

Nov 16, 2011, 1:20 AM

Post #3 of 9 (1894 views)
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Re: [jts1957] Please assist, magnavox LCD BLACK..... [In reply to]	Can't Post

? any trace of video?

Nope.

it has no hint of lighter shade or anything.

jts1957
Veteran

Nov 16, 2011, 2:01 AM

Post #4 of 9 (1890 views)
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Re: [sdavis] Please assist, magnavox LCD BLACK..... [In reply to]	Can't Post

Make sure Inverter board(s) have:
1) B-Plus
2) blon (back light on, sometimes called enable).

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Location: Far, Far Away

sdavis
New User

Nov 16, 2011, 2:07 AM

Post #5 of 9 (1886 views)
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Re: [jts1957] Please assist, magnavox LCD BLACK..... [In reply to]	Can't Post

i dont have a clue what those acronyms mean, please be kinda more specific as to what to look at, for, and how to check. Thanks for the direction.

jts1957
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Nov 16, 2011, 2:34 AM

Post #6 of 9 (1885 views)
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Re: [sdavis] Please assist, magnavox LCD BLACK..... [In reply to]	Can't Post

First you would have to have tools to disassemble the back of the set from the front. Then you will need a DVM (Digital Volt Meter) and measure DC volts at the previous points I mentioned.

B-plus (12 to 24 volts usually) and blon (3 to 5 volts) hopefully will be labeled at one end or the other of the harness that arrives at the Inverter board. Both should come up (and stay up) when you turn the set on (B-plus may be present as soon as set is plugged in).

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Location: Far, Far Away

sdavis
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Nov 16, 2011, 2:54 AM

Post #7 of 9 (1883 views)
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Re: [jts1957] Please assist, magnavox LCD BLACK..... [In reply to]	Can't Post

Got it, yes its been apart multiple times i do have a volt meter and will try this out tomorrow, i'll keep you posted if you dont mind. Do you think the easy answer from the repair guy was to simply say the panel is out, or are the two not related?

jts1957
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Nov 16, 2011, 4:44 AM

Post #8 of 9 (1882 views)
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Re: [sdavis] Please assist, magnavox LCD BLACK..... [In reply to]	Can't Post

When you power it up with the back off, you should be able to see through various openings, whether the back lights are coming on at all.

IF your back light IS coming on (and staying on) then you "may" have a bad panel.

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Location: Far, Far Away

JohnRocks
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Nov 21, 2011, 11:38 AM

Post #9 of 9 (1871 views)
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Re: [jts1957] Please assist, magnavox LCD BLACK..... [In reply to]	Can't Post

There is not worth for going to repair your TV in a warranty period they will just replace the part with the same "bad" capacitor so don't bother. It will just break down again in a few months. Just opened it and found the 2200mfd cap was swollen and leaking. There was also a 1200mfd cap swollen and leaking. I think you also can replace it or you can go to any repair guy for replaced them both with 50 working volts dc caps of the same capacitance, put it all back together, and it works great! Thanks
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Rackmount LCD Monitor
USB KVM

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