Re: Acer X241W (Power Board Failure)
I know it's the connector to the inverter! :-p But everyone always says that the inverter only gets 12V or more. So the control lines are on the 5v lead?
And what is the "signal card"?
SK
-
Re: Acer X241W (Power Board Failure)
Because, Doofus, that is the connector to the inverter.
It carries ground, the 19V inverter supply and the inverter control lines - On/Off and Brightness.
Those voltages may indicate a problem with the signal card, or with the inverter.
PlainBillLeave a comment:
-
Re: Acer X241W (Power Board Failure)
Yes. All fuses are good. All transformers read the same (chances are slim all 12 went out simultaneously).
As for voltages on the 19v rail being a problem, I could be mistaken but I don't understand what 5v would be doing on this rail. ?Last edited by stevekasian; 09-07-2011, 07:56 PM.Leave a comment:
-
Re: Acer X241W (Power Board Failure)
Have you tried checking the fuses on the inverter board?Leave a comment:
-
Re: Acer X241W (Power Board Failure)
CNS1 is not an issue, as the only problem is the backlight not coming on.
The voltages on CNS2, however, are. Please see photo #3 (annotated) for voltage readings there.
All fuses are good.
Thanks,
SKLeave a comment:
-
Re: Acer X241W (Power Board Failure)
What voltages do you see on CNS1?And is FS3 a fuse and dose it test good?Leave a comment:
-
Re: Acer X241W (Power Board Failure)
Ok, I changed out all the caps listed previously and still no dice. Anybody?
Thanks,
SKLeave a comment:
-
Re: Acer X241W (Power Board Failure)
The 12v rectifier checks ok out of circuit.
I did notice that 2 of the largest caps in the images above (19v section) were most likely replaced by a previous tech and are slightly too tall. As a result, the head skink "cap" that goes across all 3 sections put a lot of pressure on them when screwed into place, and it appears that one may have crumpled a bit under the stress. So I've ordered replacements for all the remaining OEM caps, as referenced in a previous post, plus all 3 of the largest caps (680uf@25V) in a shorter/smaller can.
So it looks like the middle of next week I should know whether or not this did the trick!
SKLeave a comment:
-
Re: Acer X241W (Power Board Failure)
Try to start with this post in another thread - AL2423W has the same power board
https://www.badcaps.net/forum/showpo...9&postcount=23Leave a comment:
-
Re: Acer X241W (Power Board Failure)
Ok, as a follow up, I have checked the 12v rectifier in circuit and found it to be conducting equally in all directions from P-N/N-P. I'm gonna remove it from the circuit tomorrow and check it again, but I believe that's a bad sign, especially considering it's the 12v pin on the rail that is registering no voltage.
I believe I should also order the caps circled in PlainBills annotated image in the other thread, as they are apparently the only ones that look to be original equipment on this board. I will give an update here tomorrow... Time for sleeeeeep.
SKLast edited by stevekasian; 09-01-2011, 06:22 AM.Leave a comment:
-
Acer X241W (Power Board Failure)
Hi,
I have an Acer X241W with a backlight failing to come on.
Display works - I can see the OSD Menu when holding a flashlight to the screen, and it is responsive to menu/button controls.
Upon opening up the unit, I could tell it has been worked on. Replacement low ESR caps have been installed on both the power and logic boards, and the work looks good.
I pulled the inverter board and checked the transformers. They all appear to be in working order. No burns or heat marks visible and each measures the same resistance across each lead in each respective combination.
So I decided to power up the power board (Model AS08B360411) and take some readings from the 5v/12v/19v rail that powers the inverter. When switching the unit on and measuring voltages before the standby mode engages, this is what I came up with (see attached images and annotation on image #3).
There does appear to be heat discoloration on the front and back of the section of the board I'm dealing with, although I believe it is probably from an earlier failure, as no components appear to be damaged/burned.
Anyone care to help me troubleshoot this board?
Thanks,
SK
p.s. Entry #17 on the following page reports almost the same readings on the pins of a similar monitor: https://www.badcaps.net/forum/showth...ighlight=x241wAttached FilesLast edited by stevekasian; 09-01-2011, 05:35 AM. -
-
All left and right refers to looking from rear of TV (or looking from front with TV upside down)- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
-
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, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
I'd like to offer an Acer IPIMB-AR Rev: 1.02A fullflash BIOS (cleaned ME region). The model is for Acer Predator G5920.
It is a model that is based on Intel Z77 PCH and doesn't have on-board graphics and video connectors.
I suppose it doesn't have any restriction about discrete graphics cards (I mean they don't have to be in a whitelist).
Please don't mistake this mainboard with a similar model with on-board graphics and based on Intel B75 PCH.
Jumper FLASH_OVERRIDE
default position: 1-2 - BIOS area protected
position 2-3 allows to dump BIOS or write...06-26-2025, 05:15 AM -
Hi everyone, newcomer in this forum, i watched tons of video from Sorin, i like the way i calmly explain things, i did quite some console repair, i am not that bad at micro-soldering, but troubleshooting where the issue is, is definitely where i still have progress to make. Usually i was able to fix the console because the failure was obvious, or because i was able to find someone with similar measures on the board and was pinpointing what to replace that way.
Nevertheless, let's say, i don't come as a total beginner.
I have this old laptop, which suit perfectly my needs, with the...
Leave a comment: