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Re: Samsung UN55EH6000F Power issue
Yes, it stays at 5vComment
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Re: Samsung UN55EH6000F Power issue
I'm now just guessing at things and tested this resistor RP820 and out of circuit it's 0.11 but I can not find a chart online that the colors work with. Under the scope it looks black, gold, black, gray, black. but this comes as an error on the calculators.Attached FilesComment
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Re: Samsung UN55EH6000F Power issue
with power supply on, Check the voltage across the main filter capacitor CP806
This voltage should be around 165vdc in standby and go to around 300vdc when the power supply is on.Comment
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Re: Samsung UN55EH6000F Power issue
If the PFC voltage 386vdc is steady, that means the standby circuit and the pFC circuit are working as they should.Comment
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Re: Samsung UN55EH6000F Power issue
Ok, so now what can I check?Comment
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Re: Samsung UN55EH6000F Power issue
I don't have a schematic, I am using the pictures of the board. I would try grounding the BLU_ON/OFF pin CNM803 pin6 and see if the B5v and B13v stay up
It might be that the backlight drive circuit is killing the B13v?Last edited by R_J; 02-03-2022, 03:45 PM.Comment
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Re: Samsung UN55EH6000F Power issue
So when the backlight circuit is turned on there is too much load on the supply, Back to post 1 where the two mosfets were replaced, It could be that they are being turned on hard and killing the supply. There are also a pair of dual diodes, DL851 & DL852, I would check them as well
This is a guess but it might be caused by open led's in the panel and the board is shutting down due to an over voltage on the led supply.Last edited by R_J; 02-03-2022, 04:05 PM.Comment
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Re: Samsung UN55EH6000F Power issue
Just pulled them and checked with component tester and good.Comment
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Re: Samsung UN55EH6000F Power issue
What voltage do you get on JP840 when the backlight circuit is enabled (BLU_ON/OFF ground removed) Does it jump up to 300vdc? or is it higher? If it jumps up higher, connect the backlights and check the voltage again.Comment
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Re: Samsung UN55EH6000F Power issue
On JP840 I get voltage up and down. but with BLU_ON/OFF jumped to ground I get no volt. Is that what you wanted to know?Comment
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Re: Samsung UN55EH6000F Power issue
Yes, when you say you get voltage up and down can you give a number?Comment
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Re: Samsung UN55EH6000F Power issue
from 54v to 11v constant fluctuation.Comment
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Re: Samsung UN55EH6000F Power issue
That is way too low, I suspect there is still a problem with the mosfets QL801 & QL802 or there gate drive circuit.Comment
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Re: Samsung UN55EH6000F Power issue
QL801 and QL802 are new.Comment
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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... -
Hello Everyone, this is my first post and I am excited to be a part of such a great community. I've been reading these forums for awhile and there really is some good friendly people here. No bashing and being rude like 90% of other forums Ive been to. Lets get to the good stuff.
I have two years of college in Electronics Engineering Technology. Ive been tinkering with electronics sine about 1990. I know enough just to be dangerous, so be gentle.
Make: Samsung
Model: UN60ES6500FXZA
Power Supply P/N: BN44-00525A
Symptoms: The TV was... -
Hi all,
My Samsung TV display recently stopped working while I was playing PS4 (no storm or anything to indicate a power surge). I could still hear audio through the PS4 but no display. The TV kept trying to turn on but would turn off after a second or two.
I tried the obvious troubleshooting steps like unplugging, replugging, trying different outlets and power cords with no luck. Someone on another forum suggested that it may be a power supply issue so I purchased a replacement power supply board but that did not help. I then disconnected the main board from the...08-31-2021, 09:32 AM -
I have a vintage 2008 Samsung 50” Plasma TV, Model code PN50A550S1FXZA with a power supply part number BN44-00222A. I repaired the power supply board several years ago finding a couple of cold solder joints on the back side of the board and it's worked great up until now. Recently a fried sound occurred with the smell of burnt electronics and the TV shut down. Trying to turn it back on yielded the typical relay clicking with no TV boot up. Upon investigation, removing feeds to the other boards within the TV it was found that disconnecting the logic board from the power supply allowed the... -
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:
Comment