Re: HP X2301 LED Backlight Monitor Power/Startup Issues
Ok, Update!
Sorry took a while, having a week of storm/hard rain (still ongoing) atm. Here are the readings of the 2 regulators.
I did 2 versions, One following this methodology. Link -> [url]https://www.badcaps.net/forum/showthread.php?p=300999[/url][B] (Option A)[/B]
And the other by placing the "Black/Com" lead on the GND labeled pin.[B] (Option B)[/B]
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[B]Here are the results.[/B]...
DaemonCross
Member
Last Activity: 09-09-2018, 05:17 AM
Joined: 07-11-2018
Location: Manila
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Re: HP X2301 LED Backlight Monitor Power/Startup Issues
Alright! Will do!... When I get the time to go home I'll re-check them V's asap. Any other reading you need me to grab while I'm at it? Haha.Leave a comment:
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Re: HP X2301 LED Backlight Monitor Power/Startup Issues
Additional #2:
The D2 and D3 Diodes leading to the Regulator Highlighted in Pink. Not sure if it's related but if memory serves right.
D2 101F SM340A = 4.9v
D3 101F SM340A = 4.6v
I'm just curious why they seem to be in the same line but D3 seems to have lost voltage?Leave a comment:
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Re: HP X2301 LED Backlight Monitor Power/Startup Issues
Additional:
I did notice something peculiar. If you look at the image on the whole board. The IC's highlighted in blue on the far right, the bottom most one. When tested with a lead on the upper right leg in relation to the image.
Shows the voltage spike in tune with the pulsing in the buzz.
[B]During Start-Up Failure[/B] it's spiking/pulsing 1.2v to 2.7v. When [B]Monitor Functional/Powered On[/B]. It's 0v.
While the rest of the IC's highlighted in blue are a stable (+)4.7v....Last edited by DaemonCross; 07-13-2018, 02:58 AM.Leave a comment:
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Re: HP X2301 LED Backlight Monitor Power/Startup Issues
Hi!
I'm very new at this and just learning along the way (Self-Youtube), haha. So I'm lacking with the tech jargons atm. By legs I mean the long legs I skipped the unsoldered short ones in the middle.
The Voltages for the 9997GH is (-)12v on Both Legs on Standby. (-)8.5v on the Left and (-)12.32v on the right when live.
As for the M482 it is (+)1.2v on the left and (+)1.2v on the right
Yes the DC Adapter Brick is 12v.
The 4r7, Buck you mentioned. By Memory (Not...Last edited by DaemonCross; 07-13-2018, 02:19 AM.Leave a comment:
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Re: HP X2301 LED Backlight Monitor Power/Startup Issues
Additional:
It seems the voltages on the regulator indicated in pink increase in value from 1.2v (Both Legs) to 2.1v Left Leg and 4.7v Right Leg. After re-flowing some capacitor and diodes.
Unfortunately Monitor still symptomatic. haha.Leave a comment:
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Re: HP X2301 LED Backlight Monitor Power/Startup Issues
Hi,
Many thanks for the SMD Input, I badly needed that. It's crazy how the naming convention went south as far as SMD Caps goes. How hard is it to use v and uF right? haha.
I reckon going a bit higher in volts cap wise should be the same thing as with through-holes? As long as I keep within the right uF values right?
Uh... The caps that were originally there were...
TAICON C1113(M) 25v 220uf Replaced with PANASONIC EEU-FM1E221 25v 220uF
JAMICON 116C2(M) 100v...Leave a comment:
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Re: HP X2301 LED Backlight Monitor Power/Startup Issues
Hi,
Just opened it back up and... I managed to have it show symptoms while it's taken apart. Judging from what I can tell. The LED Power Light Flicked once then shut-off followed by very faint buzzing(s) with a pulse around the area in red in general. And The Light Blue ones are (from how i hear it) possibly what's emanating (or affected by) the buzz. As moving my ear over each one you can hear the increase in tone as you hover over them. The Buzz goes away (Normal Operation) after one or a few attempts of unplugging...Leave a comment:
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Re: HP X2301 LED Backlight Monitor Power/Startup Issues
Hi, I'm a bit of a newb at this... haha. Willing to learn!
So, how does one check these voltages and what should I expect? Whats frustrating about the monitors issue is that whenever I take it apart it powers up fine, haha. So it's hard to nail down what's wrong with it whenever you try something on it.
Do you think it's not a capacitor issue? Since the thing is capable of powering up when it does?Last edited by DaemonCross; 07-11-2018, 08:13 PM.Leave a comment:
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HP X2301 LED Backlight Monitor Power/Startup Issues
Hi,
I have an OLD (7-8 years) HP x2301 LED Monitor that has been my workhorse for years. Just recently it's been exhibiting the FF:
[B]Issues.[/B]
1. Powering On the monitor the day after use is a 50/50 chance if whether it works or not. The Power LED light lights up for 2-3 secs then turns off.
[I]Unplugging and replugging the device has a -small- chance to get it to turn on fully up to the point that it searches for a signal at that point the monitor is fully operational.[/I]
2. The Monitor when fully activated is stable... -
Need help how to read SMD caps...
Hi,
I'm very new to the electronics field. I'm attempting to repair an old monitor HP x2301 and I've already replaced the 2 Through Hole caps, and still no joy.
With that I'm moving on to trying to replace [B]SMD[/B] Caps, but I can't seem to read it right as the SMD caps have so much variance in how they are labeled. Where the V and the uF aren't indicated. And the layout between SMD manufacturers doesnt seem to follow one specific standard.
Here are the SMD CAPS in question. I need Help Identifying/Reading the values so I can order the right replacements,... -
Re: New Members - please post your introductions here
Hi,
I just recently got interested in trying to learn electronics. By profession I'm a 3D Generalist specialized for game development. With a recent stint of my workstation (Built it myself) finally breaking down in domino fashion (8 year old rig, You can tell I take care of my equipment, haha.)
I want to learn how to learn how to properly read/diagnose on a professional level what caused electrical/system failures and actually FIX THEM! (I've been assembling PC's for years I consider myself a journeyman...Leave a comment:
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Re: Bad capacitor? on PS board of Sharp Aquos LCD TV LC-50LE442U
How do you tell if its the start up caps that's acting up? As I have a similar issue with a monitor I'm working on (Newbie/Hobby) thats 50/50 chance to power on when you plug it in....Leave a comment:
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