Hi i have a westinghouse lvm 42w2 LCD tv and when i turn it on the westinghouse light turns on but i dont get any light or flicker or anything on the screen. ive taken apart the tv and removed all the logic boards and inspected them for bad caps or burn marks or anything really but everything seems to look good. While looking at the power supply it looks like there are 2 transformers and another thing that looks like a transformer but im not really sure, ill post pics after this post. If anyone has some diags i could throw at this thing to try to find out what is the issue that would be greatly appreciated.
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Re: Westinghouse lvm 42w2
here are this pics of the logic boardsAttached Files -
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Re: Westinghouse lvm 42w2
Check all fuses on the boards. Notorious for blowing them.Comment
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Re: Westinghouse lvm 42w2
Could you be a little more specific about "but i dont get any light or flicker or anything on the screen." Specifically, if you select a TV channel do you hear sound from the speakers? Have you tried hooking up a video game or DVD player and stepping through the inputs to see if you get any sound? If you shine a flashlight on the screen do you see a picture?
On many power supplies the output connectors are labeled with the voltages. If this is one of them, have you checked those voltages?
It's hard to tell with the heat sink covering the caps (bad design, by the way), but one of those caps looks a little suspicious. What brand are the caps?
Suggestions: Try selecting various inputs as described above. Report the results.
Requests: A side view of the power supply so we can see if any of the tops of the caps are bulged. And an over-all shot of the TV so we can see how everything hooks together. And a picture of the inverter.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Westinghouse lvm 42w2
ok so i set my voltmeter to 2k and touched the two probes together and got a reading of 0.0 then i tested the fuse in the circuit and got a reading of 0.0 with switching the probes on both ends of the fuse. then i took it out and tested it by its self and got the same readings of 0.0Comment
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Re: Westinghouse lvm 42w2
ok im rerunning the tests with the settings at 200 ohms
probes together = 20.4
fuse out of circuit =19.9
fuse in the circuit = 20.1Comment
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Re: Westinghouse lvm 42w2
If touching your probes together are reading 20.4 ohms, there is something seriously wrong with your multimeter. It should read less than 1.0 ohms.Originally posted by testas86 View Post
Check/change your battery. Clean, reseat your probes.--- begin sig file ---
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Re: Westinghouse lvm 42w2
ok i changed out the battery and i got some new reading
probes together = .4
fuse in circuit = .4
as far as changing anything on the tv channel input or anything to that effect i cant because it doesnt power up that far. only the little light under the screen turns on when i press the power button everything else is dead like its off.Comment
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Re: Westinghouse lvm 42w2
the caps on the power supply are nichicon and rubyconComment
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Re: Westinghouse lvm 42w2
Your fuses are good. You need an accurate multimeter obviously when measuring things otherwise you will get false positives.Originally posted by testas86 View Post--- begin sig file ---
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Re: Westinghouse lvm 42w2
In this picture: https://www.badcaps.net/forum/attach...3&d=1292875261
You will see in the lower left corner the voltages are displayed as what they should be. Please use that as a reference and test the points for these voltages. Post results.Comment
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Re: Westinghouse lvm 42w2
ok so i see the chart but how do i test it? does it need to be all back together? or can i test it while its out? also this is what the chart says
o/p
5Vsb===5v/1.5A
PSON - Low active
5V=== 5V/4.0A
12V=== 12V/3.0A
18V=== 18V/2.0A
audio === 18V/1.0A
120v=== 120v/1.7AComment
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Re: Westinghouse lvm 42w2
Assemble all your boards so that everythig is connected.Originally posted by testas86 View Post
Put your multimeter on 20V DC (if manual). Put your black into COM, red into Volts. Pick a ground screw near the connector for your black probe. Put your red probe on all the pins one at a time EXCEPT the 120V pin. Report all voltages.
For the 120V, is that marked AC or DC?--- begin sig file ---
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Re: Westinghouse lvm 42w2
ok ill have to wait i have the parts with me at work and the rest is at my friends house. so when i get a chance to plug everything in i plug the power cord in as well?Comment
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Re: Westinghouse lvm 42w2
also i plug these in right? and test on the bottom pins?
pics attachedAttached FilesComment
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Re: Westinghouse lvm 42w2
Yes, power cord plugged in. Otherwise voltages will read 0V.Originally posted by testas86 View Post--- begin sig file ---
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Re: Westinghouse lvm 42w2
Yes, be careful not to slip with your probes. You could short out something.Originally posted by testas86 View Post--- begin sig file ---
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Re: Westinghouse lvm 42w2
BEFORE you do any testing, please answer all of PlainBill's questions in post #4.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
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Please do not post inline and offsite as they slow down the loading of pages.
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Re: Westinghouse lvm 42w2
Quick check for novice, reconnect boards back to original conf turn set on.
power light on?
check heat sinks on main board are the warm?
If yes to both , the main module has lost its firmware flash.
replace main board ,bobComment
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Re: Westinghouse lvm 42w2
Hey guys sorry i havnt answered your questions or anything ive been dealing with the holiday stuff but now that they are over ill post all the information your asking for.Comment
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