Re: Westinghouse L2046NV 2 seconds to black
What is the number of U 200 back light controller? Is it BIT 3713?
What is the number of U 200 back light controller? Is it BIT 3713?
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Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!
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Re: Westinghouse L2046NV 2 seconds to black
YesComment
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Re: Westinghouse L2046NV 2 seconds to black
I suggest you check transistors Q201, Q203, Q204 and Q208 for shorts. Also check the value of resistor R210. These are surface mount components located on the bottom of your power board and will prevent the backlights from turning on if failed. One or more of these transistors shorted are a common failure on this board.Last edited by jetadm123; 11-27-2011, 01:56 PM.Comment
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Re: Westinghouse L2046NV 2 seconds to black
I am pretty sure that you can use the BIT3193 data sheet.
Pin 7 is the ground
Pin 6 is the back light on and off
Pin 10 is the supply voltage.
Can you see if these voltages stay the same when the back lights are on and off?Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!Comment
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Re: Westinghouse L2046NV 2 seconds to black
ok,Originally posted by alexanna View Post
with the monitor on (green) pin 7 ground to pin 10 source i'm getting 4.96v
off (amber) i'm getting 0
pin 7 ground to pin 8 back light on/off i'm getting 1.548
off i'm getting 0
i checked the r210 and i'm getting 9.9ohm
i tried the power MOSFETS again (40T03GP). On the one between the souce and gate i'm getting nothing (OL). On the other i'm getting 13.08 mOhms between the source and gate, then .569 mOhms when i put my finger between the 2 leads. There are 3 other transitors i haven't checked yet.Last edited by Mr Bill; 11-27-2011, 02:22 PM.Comment
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Re: Westinghouse L2046NV 2 seconds to black
The voltage readings you are getting with the back lights on and off,is that with a signal going to the monitor.like in your first post you would see an image on the desktop.Originally posted by Mr Bill View PostWhatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!Comment
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Re: Westinghouse L2046NV 2 seconds to black
I dont have the monitor hooked up to anything but you can see the no signal square in center of the screen until it goes black but you can still see the no signal square with a flashlight after it goes black. I keep having this gut feeling that the 40T03GP Mosfets have something to do with the 2 seconds to black but the smd 2a fuse (f200) still being good is weird. I figured if the MOSFETS were bad the fuse would be blown.Last edited by Mr Bill; 11-27-2011, 03:06 PM.Comment
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Re: Westinghouse L2046NV 2 seconds to black
what amperage is F200 ,is there a 'W' stamped on it?Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!Comment
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Re: Westinghouse L2046NV 2 seconds to black
I misread your #27 post.Check the voltages with a signal going to the monitorWhatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!Comment
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Re: Westinghouse L2046NV 2 seconds to black
i think i killed it. I hooked up the pc to the vga port, went to plug it in a loud pop with sparks, i quickly unplugged but now the monitor won't even turn on. I'm looking all over the board trying to find some burnt marks but i don't see any.Comment
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Re: Westinghouse L2046NV 2 seconds to black
Check all your fuses.Originally posted by Mr Bill View Post--- begin sig file ---
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Re: Westinghouse L2046NV 2 seconds to black
on the power supply side
f103 i'm getting 10.27 ohms
f102 (right next to transformer) i'm getting 98.8ohms. I got a little sparking action from the leads while testing this one
on the inverter side
f101- 0 ohms
f100- 0 ohms
f200- 0 ohmsComment
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Re: Westinghouse L2046NV 2 seconds to black
A good fuse should measure less than 1.0 ohms. Resistance should always been measured with power off and device unplugged from AC outlet.Originally posted by Mr Bill View Post
So F102 and F103 are both bad.--- begin sig file ---
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Re: Westinghouse L2046NV 2 seconds to black
Also check the bridge rectifier (long black rectangular component just left of the big cap). Number the pins 1, 2, 3, and 4.
Measure the resistance between pins 1-2, 1-3, 1-4, 2-3, 2-4, and 3-4. You can do this test in circuit.
Any reading less than 30 Ohms suggests a short. If you get such a reading, desolder the bridge rectifier and retest all pin combinations again.--- begin sig file ---
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Re: Westinghouse L2046NV 2 seconds to black
i"m going to have to desolder the bridge rectifier, it started at 12 ohms and slowly climbed to over 30. I think i found the pop. In order to check the pins on the back light controller i had to flip over the power supply board. Stupid me never noticed that a heatsink was touching the back of the lcd housing so that was probably the spark. You can see in the pics.Attached FilesComment
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Re: Westinghouse L2046NV 2 seconds to black
I use cardboard for separation when it comes to board acrobatics.Originally posted by Mr Bill View Post--- begin sig file ---
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Re: Westinghouse L2046NV 2 seconds to black
yeah i think i learned that lesson the hard way LOLOriginally posted by retiredcaps View Post
do you think the r103 is toast. Its the circuit board thats connected to the lcd itself or do you think replacing the 2 fuses you mentioned ealier will get me atleast back to where i was. This is assuming the bridge rectifier checks out.Comment
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Re: Westinghouse L2046NV 2 seconds to black
Clean off the burnt stuff with some alcohol and see if you can read the markings on it. Then measure the resistance and see if it matches. If it does, you may be in luck.Originally posted by Mr Bill View Post
If you replace the 2 fuses and the rectifier is okay out of circuit, then you might be back to where you were.--- begin sig file ---
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Re: Westinghouse L2046NV 2 seconds to black
here are the numbers for the rectifier
1-2 5.97
1-3 6.01
1-4 12.84
2-1 OL
2-3 OL
2-4 OL
3-1 OL
3-2 OL
3-4 6.06
4-1 OL
4-2 OL
4-3 OL
The burnt r103 doesnt have any numbers on it. R104 looks identical and it also has no numers on it. R104 measured .01 ohms while r103 measured .07 ohmsComment
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