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Re: Insignia NS-LCD32-09 with power on/off issues
That is great to know, good job fixng it..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: Insignia NS-LCD32-09 with power on/off issues
So I'm having this exact same issue with my Insignia NS_LCD32-09 tv. Should I start a new thread or just post here?
jcgComment
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Re: Insignia NS-LCD32-09 with power on/off issues
I would do the same thing that Bud advised me to do. Add solder to all the FETs on that power board. Let us know what happens. Good luck!Comment
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Re: Insignia NS-LCD32-09 with power on/off issues
So your talking about the board that you posted a picture of in post #14 on this thread, right? Mine looks the same as that pic. When I look at the board it's looks like there are 9 FETs total, that sound right? There are 4 on the big huge heat sinks and then there are 5 more standalone ones with smaller heat sinks on them. I'll wait for confirmation and then go resolder them all.
jcg
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Re: Insignia NS-LCD32-09 with power on/off issues
OK, I touched up each of the 3 pads on all the heat sink parts and still have the issue. When the TV turns off I still have 5 volts on the connector going to the main TV board, PS_ON goes from 5V down to ~0V, and both 24V and 12V go away. Any ideas what to try next?
jcgComment
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Re: Insignia NS-LCD32-09 with power on/off issues
post a high res pic of the backside of your board.Comment
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Re: Insignia NS-LCD32-09 with power on/off issues
I installed the board back into the TV so here is a picture of it. If you need the other side of the board I'll have to remove it from the TV again and take a pic. It's pretty much the same board photo as post #14.
jcgAttached FilesComment
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Re: Insignia NS-LCD32-09 with power on/off issues
the other side.... and high res... so we can maybe identify with some sharp eyes any bad solder joints. Usually bad solder joints are there were things get really hot. So look at the fets, diodes and transformers. You may need magnifiers.Comment
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Re: Insignia NS-LCD32-09 with power on/off issues
The website lowers the resolution of images you upload (I believe) to make things faster, so not sure I can get a good enough picture. I'll look over the board with a magnifying glass, and I've done enough soldering I should be able to spot a bad solder joint if that's it.
Besides that if someone can point me at some things to take voltage measurements on that may help debug this please let me know. I looked at all the caps and they look fine, but sometimes they don't bulge out even when they go bad. I'm pretty sure it's the power supply board so hopefully we can figure this out.
jcg
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Re: Insignia NS-LCD32-09 with power on/off issues
Try heating the board to see if you can speed up or slow down the turn off?Comment
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Re: Insignia NS-LCD32-09 with power on/off issues
OK, I just took the power supply board off again and looked at all the solder joints on the back side with a magnifying glass. Thought I found something but then looked at the schematic and U951 pin 13 is a NC (it didn't have any solder on it). Anyways I touched up C941 as it was the only part I found that MAYBE could have had an issue, so just turned the TV back on and will report if it fixed the problem.
Besides that any places I can take voltage measurements to see where the fault is? I can try heating things up, but would like to know if there is a certain part that is a likely culprit vs just randomly heating things up.
jcgComment
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Re: Insignia NS-LCD32-09 with power on/off issues
Could be the power supply, could be the main board. Your TV turns off to standby after 5 to 7 mins? So something has to get warm or hot.
To verify the power supply you can try to force it on manually with a 1k resistor and load up each rail and wait until something quits. It still could be caps too, but for that you would need a proper ESR tester.Comment
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Re: Insignia NS-LCD32-09 with power on/off issues
When I freeze spray the 100uF 470V large black capacitor that is right above the AC cord connector it seems to fix the problem (at least temporarily). It's hard to tell because I might be cooling off some other parts that are near by. If that cap was going bad would it cause this problem?
jcgComment
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Re: Insignia NS-LCD32-09 with power on/off issues
So anyone have any ideas what I can try for a next step? Some voltage measurement that would point at the fault when the TV turns off?
jcgComment
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Re: Insignia NS-LCD32-09 with power on/off issues
OK, so wasn't getting much help on where to probe the power supply board to see what may be failing, so I just decided to replace the power supply board as that seemed like the likely culprit based on the others that fixed their issues in this thread. So the PS board came in last night and I replaced it and unfortunately I have the same issue.
At this stage not sure it's worth spending much more money to fix, but if anyone has some ideas on what else this could be please let me know.
jcgComment
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Re: Insignia NS-LCD32-09 with power on/off issues
hi guys, got power bord ishues, same power supply buy I don´t get 12v or 24v outs. Please help.Comment
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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... -
hey guys, hoping for some pointers to repair an eBay bought "faulty" laptop.
Ill try and give as much info as I can.
Dell Inspiron 17 (7786) Laptop
Service Tag: 5J0NHT2
Bios: 1.9.0
When I received this , it would only flicker on the KB backlight for a second, then off and on.
Then it started getting weirder!
Sometimes when attaching the AC power supply, and pressing various pre-boot diagnostic keyboard keys... it did try to boot, in fact out of a hundred attempts, the laptop did actually boot into the Bios ! but never has... -
I recently turned on my old NES to find the red light won't go on at all. When powered on it shows black bars on the tv and a loud buzz through the tv speakers. Powering it off, the buzz goes away and tv goes back to normal (white snow).
I tested the power supply itself and it is outputting 9V as it should - first two solder joints on the board at the power port show the same.
Here's where it starts getting funky - When powered on, one side of the 7805 voltage regulator is showing 18V and the other is about 8.7V (center 0).
On the big blue connector I get...
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