-
--- 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 --- -
Re: Neovo f-419 Power but 1 second of picture
A 3% difference in resistance between Inverter Transformer secondaries, has always been stated on here to be the 'rule of thumb' to decide if one is faulty or not.However I have seen up to 10% difference and still working fine.Perhaps it is dependant on particular models or associated circuitry,but certainly removing them from circuit and testing may well be helpful.When initially faced with a '2 secs to Black ' symptom, my first check is ALWAYS to test using a good spare Backlight, as its usually an easy thing to do just by taking the case off.But of course,everyone has there own ways, and not everyone always has a spare backlight handy.Comment
-
--- 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
-
Re: Neovo f-419 Power but 1 second of picture
PlainBill came up with the 3% a while back and explains it in this post.
https://www.badcaps.net/forum/showpo...7&postcount=18
So that is the number I have always quoted.
I think I have also seen other people (tom66 or budm) suggest 5%.
It is obviously easy if the reading were 0L or out of range.
We have seen cases where the inverter transformer was barely within the 3% range and found to be root cause. I'll modify the troubleshooting guide to reflect the possible variations in percentages in the next revision.However I have seen up to 10% difference and still working fine.--- 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
-
Re: Neovo f-419 Power but 1 second of picture
Well I always go by that rule - what we need is statistics - no one I have ever advised to buy a transformer has ever come back and said what a waste of money- the lamps had gone. I have seen considerably more people abandoning a project or increasing their outlay because they dont have the ability/ patience/ luck to swap out the bulbs.
Having said that I believe most posters are asked to test lamps and transformers.
For me, while they are photographing the board they can test the transformers it is one of the easiest tests and if it fails the next step is check the bulbs/wiring so that they dont end up buying both which will for a small monitor be more than a working monitor.
I dont believe any of this is an exact science Just changing leads around top to bottom can bring a backlights back on.Last edited by selldoor; 05-27-2012, 02:59 PM.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
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. π
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 a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started βfading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.
I ordered a supposedly βnew' Tcon board this time, and... -
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...
Comment