For those in 220V locales, anyone power their SMPS with DC, and how high of a voltage is okay?
What kind of PSU?
I suspect that 240V * sqrt(2) = 340V DC is probably fine because that would be about how much the the primary rectifier ends up with peak voltage. Just wondering, other than input capacitor voltages, can one go up above this 340V without damage? Will that input capacitor be the upper bound?
Wondering if exactly that, can I feed near 400VDC into bona fide specced at 220V SMPS without damage?
Currently have a 120/220V switchable SMPS I want to see if I...
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have been looking at earth leakage clamp meters and its like a minefield out there . i wondered if anyone here had bought one that actually works properly ?...04-17-2024, 01:31 PM
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Hallo zusammen! Das oben beschriebene TV-Gerät zeigt, wenn es eingeschaltet ist, für ein paar (5?) Sekunden am rechten Bildschirm-Rand nur die Zahlen 47, 48 und 49 untereinander. Die 48 in der Mitte ist etwas größer. Dann schaltet sich das Gerät in der nächsten Sekunde aus und wieder ein ... Dieser Kreislauf ist endlos. Mit der Fernbedienung kann nur ein/aus bedient werden! Sonst nichts. Wenn eingeschaltet, kann ich durch Löcher in der Panel-Rückwand sehen, dass der gesamte Bildschirm aktiv ist (zartes blau), aber kein Inhalt - nur die 3 vorhin beschriebenen Zahlen. Ich habe an der...Yesterday, 12:34 PM
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Does anyone have a copy of this board schematic?...Today, 04:51 PM
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I got paid to take this. It had the typical DPS STBY IC bad. Replace it and life was grand....or so I thought. I've never seen this one before; this TV will just magically turns itself on for no particular reason on earth. I did a hard reset on it (twice) clearing all data & settings out.....will still do this. Even removed the batteries from the remote....in the unlikely even there was a stuck key... Still doing it. I did not set up any of the 'smart' functions, I just fed it a source from a HTPC. It doesn't matter what input is selected.....still does it. No rhyme or reason as to frequency....Today, 05:00 PM
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Today I got a 65" TV from Hass company. It was not showing any picture. I taped the 6 lines of the Tcon FFC cable on the faulty side of the shade and the picture came but the display on the side where I blocked the pins was not showing properly. I checked the volts on the VGH point and -3.5 volts was abnormal, there should be about 28 to 30 volts on this point! There were +30 volts on the VGH point on the Tcon. I put a jumper on the source PCB from the Tcon side and saw, the raster started appearing on the display. I also tried soldering the 6 blocked pins but the picture did not come properly....Today, 04:54 PM
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Hello friends, I have MTC 58' TV which has stand by position. I thought the software was corrupt. I have downloaded the software from the internet but the data is not matching. The format window is opening from the TV software but none of the buttons on the remote or TV are working. Why? Can I edit this software with a hex editor? Is there any guide to edit this? Or does anyone have access to this software? Thank you very much for your help.
model no.---'[Mtc4k58s21]
panel---D58-M30...04-18-2024, 03:18 PM -
Hi, everyone. First post of an actual repair. I'm a technician but a complete newbie with laptops.
So I got this Dell Inspiron to play with.
No charger, so I connected to my bench PSU.
The laptop also didn't include: hard disk (I added one of my own for testing, see below) and wireless PCB (but I doubt this could have anything to do with this particular failure).
------What it did (and didn't do)------
1) I turned it on and it powered on. Powered down in 2 seconds by itself.
2) Removed RAM, changed slot. Same...04-04-2024, 12:39 PM -
Have a 033 board with a missing component at HDMI port bottom side. It's a diode, but wondering if anyone knows what type, value etc or even better a source to buy replacement.
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"Untitled.png","data-attachmentid":3257931}[/ATTACH]
Any help appreciated.Have a 033 board with a missing component at HDMI port bottom side. It's a diode, but wondering if anyone knows what type, value etc or even better a source to buy replacement.
...Today, 03:25 PM -
Hello folks!
Can anyone help me with the BIOS for this model?
MB: NM-D352 Rev 1.0
SN:PF-3B5XV8
Type Number: 20W1-S2E400
BIOS dumps attached....Today, 03:20 PM
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Hi people, i have an acer nitro 5 with motherboard model gh51m la-k861p , it came with the resistor pr103 blow up, i repaced that resistor, i check the coils plb2, pl301, pl501 and has no short to ground, i conect the charger and it doesnt power at all, i check pqb3 on pin 5 to 8 and its 19v, pin 1 to 4 its 0
so i repaced, pqb3, pqb4, and makes no change, still no acdrv, i replaced bq24781 and makes no change, still no acdrv, if someone can help pls, thanks, this are the schematic and boardview
[SIZE=14px][B][MOD EDIT] LINK to schematic & boardview[/B][/SIZE] -> [url...Today, 11:30 AM -
So I'm having difficulty finding line drawings for this motherboard NM-C53. My charging port was broken. So I replaced it with a terrible solder job. Problem is pin 3 on the drawing I saw on here has it listed as adapter-id. Now I checked my other pins and I have continuity (resistance check from power to ground). Pin 3 shows nothing. Now I boot the computer and it says to use a power adapter with the proper wattage and won't charge. I have read that pin 3 is usually tied to a resistor that identifies the charging power thus disabled the ability to charge if it fails the check. I look at my board...Today, 07:27 AM
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I got paid to take this. It had the typical DPS STBY IC bad. Replace it and life was grand....or so I thought. I've never seen this one before; this TV will just magically turns itself on for no particular reason on earth. I did a hard reset on it (twice) clearing all data & settings out.....will still do this. Even removed the batteries from the remote....in the unlikely even there was a stuck key... Still doing it. I did not set up any of the 'smart' functions, I just fed it a source from a HTPC. It doesn't matter what input is selected.....still does it. No rhyme or reason as to frequency....Today, 05:00 PM
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Hello, I need the diagram for the mobo mentioned in the title. I can only find pdfs but not the cad file to open in boradviewer, I can't find it anywhere.
Does anyone have the file in question?? I appreciate any information.
Thanks and regards.Today, 07:04 AM -
Does anyone have a copy of this board schematic?...Today, 04:51 PM
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HI guys!
I've got a Samsung LH82QENELGC/EN with a problem and need some advice and I hope this is the forum to use?
I'm from Norway so I'd like to apology in advance if my description of the fault is kind of simple or the names on the components are way off. 😊
the TV is powering up, working as normally and picture is all good, except a 1.5-inch-wide vertical line of snow/static across the screen.
This TV is a Signage Display/Public Display version and it's been used at my work for 4-5 years showing commercials 24/7. The fault occurred when...Today, 11:28 AM -
For those in 220V locales, anyone power their SMPS with DC, and how high of a voltage is okay?
What kind of PSU?
I suspect that 240V * sqrt(2) = 340V DC is probably fine because that would be about how much the the primary rectifier ends up with peak voltage. Just wondering, other than input capacitor voltages, can one go up above this 340V without damage? Will that input capacitor be the upper bound?
Wondering if exactly that, can I feed near 400VDC into bona fide specced at 220V SMPS without damage?
Currently have a 120/220V switchable SMPS I want to see if I...Today, 08:03 PM -
Hi.
My Hp G6 laptop died while using it.
I opened it up and used a thermal camera on it to see if anything was getting hot. The RT9513 chip (EQ ED B1Y) which is supposedly a battery charger ic was getting hot. I ordered a new one and replaced it but its still red hot. Where should I look next?04-20-2024, 10:02 AM -
Hello. Can you please help me with removing the bios password from my Panasonic Toughpad?Today, 09:21 AM
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need bios, tried difference dumps no power. But with oem bios laptop starts no video ,thanks masters...Today, 12:44 PM