hello i have a pn64e550d1fxzc powers off and on power supply issue ? thanks
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Re: pn64e550d1fxzc power issue
It could be almost anything unfortunaely without some voltage readings being taken.
Are Vs and Va trying to reach the voltage given on the label on the back of the panel?
Have you checked to see if there is a short circuit from Va to chassis, Vs to chassis?
Do you have photo's of your boards.Last edited by dick_barton; 11-14-2020, 09:10 AM.Willing to help but I'm no expert. -
Re: pn64e550d1fxzc power issue
To add onto Dick_barton's comment, it would also be nice to know more detail about the powers off issue you described. Does it turn on and work for an hour before it powers off or does it power off before picture can even appear on screen?Comment
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Re: pn64e550d1fxzc power issue
tvs powered on now but sometimes it shuts of when warm? when it turns off again ill take it apart and look. any known cap issues or cold solder joints i should look for thanksComment
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Re: pn64e550d1fxzc power issue
tvs still workingComment
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Re: pn64e550d1fxzc power issue
update turned tv off for 45 mins unplugged plugged it back in. within 5 mins it powered off then powered back on then i couldnt power it back on it did sit in my car last night and it was very cold.Comment
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Re: pn64e550d1fxzc power issue
Touch up all the solder joints on the power supply board.Comment
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Re: pn64e550d1fxzc power issue
can putting it in the oven fix the solder joints?Comment
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Re: pn64e550d1fxzc power issue
I would use a soldering iron, not an oven. You will melt all the plastic and blow up the capacitors!Comment
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Re: pn64e550d1fxzc power issue
Okay thanks all the solder joints? I haven't tooken it apart yet it won't turn on now.Comment
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Re: pn64e550d1fxzc power issue
At least do everything mounted to a heatsink and under a transformer. Use 60/40 leaded solder.Comment
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Re: pn64e550d1fxzc power issue
Thanks ill have to pick that up take it lead free won't work? And does diameter matter?Comment
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Re: pn64e550d1fxzc power issue
I use .6 to 1 mm diameter.Comment
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Re: pn64e550d1fxzc power issue
thanks never had chance to grab the solder yet. so my tv wont power on this can still be the causeComment
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Re: pn64e550d1fxzc power issue
These 3 blue capacitors marked as 106 need to be replaced also. They are 10uf 50volt.
See pictures below. They will prevent the tv from turning on. They are on the y-main board.Attached FilesComment
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Re: pn64e550d1fxzc power issue
Thanks what type of capacitors are they I'm use to changing electrolytic capacitors, and what rating do you recommend? ThanksComment
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Re: pn64e550d1fxzc power issue
I have used electrolytic caps in this repair. You have to figure out what side is the negative and the positive. I can't remember, but it was easy to figure out.Comment
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Re: pn64e550d1fxzc power issue
thanks can you post a pic to make sure i get the right kind thsnksComment
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Re: pn64e550d1fxzc power issue
First picture is the recommended replacement caps. Second one is correct polarity of electrolytic capacitors. The stripe side with shorter leg is negative.Attached FilesComment
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Re: pn64e550d1fxzc power issue
thanks they just came today trying to desolder the old ones but having a hard time getting a hole for the leads using a 25w weller solder gun amd ive soldered and desoldered caps before thanksComment
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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 am seeking guidance on an Acer Spin 1 SP111-33 that does not turn on when pressing the power button.
Below are the observations and troubleshooting steps I have taken so far: Observations and Tests:- Verified that all critical voltages are present:
- 3.3V and 5V are always present if DC is plugged.
- 1.8V on the BIOS chip is present.
- Checked the power button functionality:
- When pressed, the voltage drops to 0V, indicating the button is functional.
- Inspected the flex cable connecting the USB, audio, and power button to JUB1:
- Confirmed connectivity is intact, ruling out issues
11-26-2024, 12:39 AM - Verified that all critical voltages are present:
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hi guys, my motherboard will not start no matter what
when connected to ac power, the battery does get charge, led indicator glows red when discharged and turns white as it is fully charged.
but rest nothing happens no sign of life.
this laptop has one preexisting usbc power issue - so i use DCIN jack for charging my laptop.
with this issue my laptop was unable to power ON only sometimes i just had to wait some time.
but now nothing happens no matter how much i wait/ charge/ press and hold power button.
i have no knowledge of motherboards ....10-20-2024, 02:48 PM -
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... -
This one's a weird one, and still unsolved despite it having gone back to Dell once.
Specs
i7-8750H, GTX 1060 Max Q, 500GB SSD & Seagate 7mm 1TB HDD. 17.3 IPS screen. This has the fingerprint reader in the power button.
Backstory
I bought this from eBay, from a wallpapering shop. £650 in 2020 which was a good price considering it's a gaming laptop. Physically it's in perfect shape, apart from the hinge mounts on the palmrest failing in the time I've had it (I have a new palmrest for it). The usual thin plastic crap modern build quality!...10-23-2023, 04:09 PM
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