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Re: Barco LCN-42 No Power
That is too low, that why I keep my 87 for poor man scope (I do have 4 scopes).Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Barco LCN-42 No Power
I thought retiredcaps would get to the answer quicker than me. I bet you didnt even have to look it up!
Here is the setting that I would have though was right.Attached FilesComment
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Re: Barco LCN-42 No Power
You meter AC frequency bandwidth is too lo for it to measure any AC in the 30~50KHz range.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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--- 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.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
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Re: Barco LCN-42 No Power
Just done a little more testing to try and work out whats going on.
It seems when I turn it on some power is supplied to the mosfet that I have marked with the letter A. This starts off at 75v or so but then quickly drops down to nothing. The same happened to the transistor which I think might be driving it? That transistor starts off at just short of 6v but then slowly drops down under 1 vault.Attached FilesComment
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Re: Barco LCN-42 No Power
I would like to try this to see if the 18v power supply section is loading down the 13VCC LINE, there is jumper wire in the middle of the picture shown with red line, lift one end up and see if the 13vdc comes back.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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--- 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.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
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Comment
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Re: Barco LCN-42 No Power
Its done the opposite.
I have disconnected the left hand side of the jumper and now I have 0v on the left hand track that goes back to the sub board but 6.2v on the right hand side that leads back to the replaced chip?
Maybe the vcc comes from somewhere else and that feeds back up to the sub board?Comment
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Re: Barco LCN-42 No Power
I have attached a pic to show the jumper that I removed and the black line shows where the vcc is coming from im getting about 8v over the black line.
If you can see C304 at the bottom there is 12v there so it seems that this is where the 13v should be coming from.Attached FilesLast edited by Jasgriff; 04-12-2012, 07:31 PM.Comment
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Re: Barco LCN-42 No Power
Boy that is strange, you may be right that the VCC is coming from somewhere else. It is usually generated by the winding of the always on power supply then it will be fed to switched transistor to be turn on when it receives the PS_ON signal.
Right now we know that the 18v, 24v are not working so it can not be generated by those two transformer. You may have to trace the line, it should end at the Cathode of the Diode and DC filter cap some where.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Barco LCN-42 No Power
Right trying to trace back where this 13v should be coming from. I cannot work out from the number what IC3 is or what it does. There doesn't seem to be any significant voltage going into it to give 12.55v out on the marked pin?
Does anybody know what it is so I can continue to trace?Attached FilesComment
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Re: Barco LCN-42 No Power
Right,
I found out what it was!
The new IC that I replaced became shorted on the DRV pin and the VCC pin one I disconnected that part of the circuit I get 14 volts back and then the 24v line was up and running!
I have now replaced the IC but left out the mosfet so I am going to test the IC to see what voltages I have going across it then I might throw in another mosfet to see how we get on.
P.s I have replaced the CS resistor that was previously blown. I am thinking that did not help with the operation of the IC and I am really hoping that by replacing that the IC will do its job and drive the mosfet.Comment
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Re: Barco LCN-42 No Power
New IC fitted and Mosfet back in.
I am getting just short of 14v on the VCC pin now but nothing on DRV.
I also noticed that there is less than 0.5V on the HV line? I am sure that this isnt correct according to the Datasheet.Comment
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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: Barco LCN-42 No Power
I am struggling to find where the HIV pin is attached too. I remember when I took the chip off it looked like it wasn't connected to anywhere. Do you think looking at the diagram that it definitely should be connected up?Comment
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Re: Barco LCN-42 No Power
Well, I wrote the post after desoldering a single capacitor so I could be high on solder fumes because I didn't use a fan for one capacitor, but figure 1 on page 2, shows a resistor in series with pin 8. That resistor looks like it is connected to the positive leg of the big filter capacitor.
If you can't find a resistor, then you should have direct continuity from the HV pin to the large capacitor then.
Note to self. Always use the fan regardless how long I'm soldering.--- 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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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi all!
I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅
I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
https://www.badcaps.net/forum/troubl...-hardware-devi... -
Hi all,
TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!
I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!
A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about... -
I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
This specification for the HP Pavilion Power Pavilion Power 15-cb009nl Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Pavilion Power 15-cb009nl boardview and Pavilion Power 15-cb009nl schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that...09-06-2024, 05:59 AM
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