Greetings to all, I hope you are well.
I consult you because I have a problem with this power source.
The TV when it is connected to the electrical power turns on the blue light but does not give an image. the source is heard a hum.
When I disconnect the power from the TV plates and power it up by itself, the hum goes away.
I have the STB voltages of 5vdc. The microcontroller is powered with said voltage and the main board LED lights up.
but not the 12v or 17v ones, nor the 300vdc high voltage voltages, nor the VS or VA....
SoporteHR
Senior Member
Last Activity: 12-05-2023, 06:02 PM
Joined: 09-03-2018
Location: Barquisimeto / Lara
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LG 42PQ30R TV power supply does not work high voltage. (Liteon PS-7411-1-LF Rev. 2.1
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Re: Delta ADP-310AF No Power and frequently chirping
Thank you very much Protocold.
I had seen that image before but since my source varies on the ICs below the connectors, I didn't dare to use that schematic to make the ground jumper.
I managed to find the schematic on the board and confirmed that pin 6 of the PSU is indeed the PS On pin. I managed to turn on the power supply, it works fine, the problem is in the motherboard.
Thank you very much for your time and help.
Muchas Gracias Protocold.
Yo había visto... -
Re: Delta ADP-310AF No Power and frequently chirping
Hola. gusto en saludarles.
Se que este post es antiguo, pero me llegó al taller está fuente de poder. Modelo: ADP-310 AF B. Marca DELTA.
Al conectarla a la linea de 110vac, en el conector es de 16 Pines. tengo: Pin 4 = 12vdc y pin 6 = 3.8vdc aprox. En los pines del secundario.
Sin embargo, he buscado por internet y no consigo el Pin-Out exacto para saber cual es el pin de PS-ON. Para poder encenderla sin la PC.
La PC iMAC A1311. Cuando se conecta la fuente de poder...Leave a comment:
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Re: DELL HNJFV Rev A00 Schematic
Many thanks.
Saludos.
...
Last edited by SMDFlea; 08-27-2021, 03:06 PM.Leave a comment:
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Re: Need Help With PSU Winsun WS200-3EAC-247
Hi all.
Although I had no answer on this query, I finally managed to repair this power source.
The 2IC1 integrated circuit that exploded is the model. UC3844.
The rest of the components were easy to identify using the datasheet of the integrated and the operational session of the 24vdc source as reference.
Once switched on I got the output of the session repaired. 11.98vdc and 37.6vdc respectively.
Case closed.
Greetings to all.Leave a comment:
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Need Help With PSU Winsun WS200-3EAC-247
Good morning everyone, receive a cordial greeting.
I have a brand power source: Winsun Model WS200-3EAC-247
PCB2003EACMAB-V12
This source has multiple voltage outputs. Dual 24vdc sources operate well.
But the session of the power source that delivers 24vdc, 40vdc, 5vdc. it does not work.
When reviewing it, 2IC1 exploded, only the last digits of the code are observed, 44N, I think it is a UC3844N
I must locate the value of several resistors that are burned out and cannot color read and others open.
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Re: PSU For CCTV - noise or interference in the image seen from the camera
Hello sorry, I was late today, I saw the message.
If we tried placing ferrite cores without positive results, we added capacitors in each chamber and it did not improve either.
The cameras work perfectly with the linear source, as well as with the 12vdc adapters that are also switching.
We tried another power source similar to this one that we are analyzing and they work well, the problem is this specific source.
Thank you for your time in answering me.Leave a comment:
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Re: Troubleshoot swtichmode power supply with DC Bench Power
Hi
On the HOT side, what voltages do you have?
You checked that the Mosfets are not shortLeave a comment:
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Re: Solved Issue with OCZ OCZ600SXS ATX PSU with very low voltages
Thanks for the info. regardsLeave a comment:
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Re: PSU For CCTV - noise or interference in the image seen from the camera
Hello STJ.
The oscilloscope is difficult, I have nothing to see the output frequency, but I think that there must be the problem
The cameras indicated that they were wired with UTP cable.
Hello. Redwire.
I'm going to try the ferrite in the wiring and place larger capacitors.
I will let you know the results, thanks for your time.Leave a comment:
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Re: PSU For CCTV - noise or interference in the image seen from the camera
Hi. following the recommendations of Redwire.
I removed the resistor that was in the C8 position, and installed the respective capacitor.
No changes, same noise.
By the way, yesterday the CCTV installer told me, that the source used for the cameras that replaced this one I am reviewing, is the same model and is presenting the same noise problem in the images captured by the cameras.
ThanksLeave a comment:
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Re: PSU For CCTV - noise or interference in the image seen from the camera
Stj. Yes. i tried but my oscilloscope (pencil type) is very basic and does not allow you to see anything in detail. Attach one of the images. (Output without noise.jpg)
I will test the radio, before starting to review the source, the first thing I did was to place a ceramic capacitor in each chamber, without results, then I tried to add a 2200uf capacitor directly at the exit to the cameras, since I also suspected that it was a filtering problem
And finally I replaced all the output...Leave a comment:
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Re: PSU For CCTV - noise or interference in the image seen from the camera
The cameras are isolated from any metal surface, plastic boxes were installed.
The cameras work well, when 12v independent adapters are usedLast edited by SoporteHR; 12-13-2019, 04:27 AM.Leave a comment:
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Re: PSU For CCTV - noise or interference in the image seen from the camera
I'm going to find out which PSU model they used as a replacement, since I didn't do that, if not the installer and owner of the PSU
I attach photos of the complete source.
thanks....Leave a comment:
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Re: PSU For CCTV - noise or interference in the image seen from the camera
Thanks, STJ. Nice to greet you.
Initially I also thought that.
But the probe in my test bench connected to a CCTV and the cable measures less than 1 Meter the noise is the same.
I also connected it to another camera that brings its original cable (Video-Audio + Power) and connected it directly to the source with a Plug connector. Same noise.
Y recalco que cambiando esta PSU por otra en la instalación de las cámaras del cliente, el ruido desaparece, es...Leave a comment:
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PSU For CCTV - noise or interference in the image seen from the camera
Hi all.
Receive a warm greeting.
I have a centralized power source for CCTV. Model SP200B S88
New, zero use.
It turns out that the CCTV HD cameras were connected, most of the cameras present noise in the image seen on the monitor.
Check, grounding, interference with other electrical cables in relation to the video cable, etc.
The source was replaced by another and the cameras worked perfectly.
Now checking at the plate level this source, everything looks good, suspecting that it was a problem... -
Re: Help please, Line + 5VSB increases the voltage. - Resolved :-)
Thanks STJ. For the confirmation.
Yesterday I finished assembling the power source, to rule out and be sure that the fault was the octocoupler, I removed the new one and reinstalled the old one, effectively the voltage went back up to 6.8vdc.
Today 08-15-2019. The source continues to operate with the stable voltage at 5.17 vdc. approx. I left the equipment on all day yesterday. And it operated correctly.
I close the case.
Thanks again to everyone for the...Leave a comment:
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Re: Help please, Line + 5VSB increases the voltage.
Thanks STJ,
It sounds logical, the LED is degraded internally, but since replacing the optocoupler, ¿
should I change the value of the LED resistance of this LED? To prevent damage to the new optocoupler.Leave a comment:
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Re: Help please, Line + 5VSB increases the voltage.
Thank you very much friend.
I just checked the diagram and replaced the octocoupler, since on the primary side, my source has no electrolytic capacitor.
I am testing the source and it takes 2 hours without changing the voltage.
I suspect it was the octocoupler.
Now will you know what happened to the original octocoupler to generate that fault, leak in the internal transistor?
After the whole day the source was turned on, the voltage of + 5VSB remained stable at 5.11...Leave a comment:
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Help please, Line + 5VSB increases the voltage.
Help please, Line + 5VSB increases the voltage.
Hello everyone, receive a cordial greeting.
I have an ATX 500W power source. Chassis Model: LPJ2-23.
It turns out that when measuring the line voltage + 5VSB. After the source is turned on, the voltage gradually increases until it reaches approximately 7.8 vdc.
If I leave it connected to the power but turned off, the voltage remains stable at 5.1vdc. approximate
I thought I was a capacitor in that sector. Then I measured them with the ESR Raptor and they measured me well,...
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