Hi stj,
I have decided to go with FASTCABLING option, I'll install a small cabinet with two 2-Port PoEs.
Adenitz
Senior Member
Last Activity: 11-27-2024, 06:30 AM
Joined: 01-29-2021
Location: AppleWorld
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Choosing appropriate PoE extender
Hello,
I have an application that uses 4 cameras PoE. I have one PoE switch in a cabinet in a server room while Cameras are outdoor at different locations. The closest camera is at distance about 80m (that is the cable length), while the furthest camera is about 160 meters. For sure, three cameras are more than 100 m from the switch in cable length. Voltage level is about 48VDC (that PoE switch is supplying.
Since PoE is working reliably up to 100 meters, obviously I neeed to use some kind of PoE extenders. In order have two options:
1. To buy 4 outdoor PoE extenders, like this... -
Cutting the jumper on Samsung TV to solve the flickering
Hello to all,
I have just seen this[URL="https://www.youtube.com/watch?v=i-jQZ-TQdgU"] YT video[/URL] about solving flickering issue on SAMSUNG TV. Reading many comments it seems this works.
But I wonder what is done here and how this solved the issue. I'm not able to find the schematics so cannot explain to myself.
Few years ago I had a flickering problem on one monitor in some factory which I managed to solve by inserting UPS between monitor and power outlet. I also notice on this occasion the flickering was gone if I put insulation tape on the power plug like shown...Last edited by Adenitz; 01-06-2024, 12:22 PM. -
Thank you vinceroger69, after reading your reply, I decided to change electrolytic caps on low voltage side even though there were no visible bulges or any deformity. I have replaced 35V, 25V and 16V caps and it indeed solved the issue.
Thank you for your reply, it indeed pointed me into right direction.Leave a comment:
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I do have ch341a and I used it few times to read and write BIOS dump files but only in laptops. Never used anything like that in TVs.
Why do you thik it is firmware issue? Are there some things I can check with multimeter to be sure that hw components are okay?Leave a comment:
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Here are the info I could find:
Hitachi model: 32HYC01, manufactured date: 1510
On the white sticker on the metal chassis I see: Model: VES315WNDB-2D-NO2
There is also the following information on the PCB board HV320WXC-200_X-PCB-x0.0, HV320WHBLeave a comment:
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Ok, I will check and get back with the required info.Leave a comment:
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Troubleshooting Vestel TV, has standby, but cannot turn ON
Hello,
I need advice in troubleshooting Telefunken TV (it is actually Vestel). There is red Standby light but TV cannot be turned on either by remote control (which is good and tested on another TV) or by actual on/off switch at the back of the TV.
Power board is Vestel 17IPS71 and I'm not sure about the mainboard, it seems like 17MB82S
Both boards are shown in the attached photos.
What is normally first that is checked in this case. I have removed power board, make sure it has no dangerous voltage on the big caps and check many components (transistors and diodes)...Last edited by Adenitz; 12-27-2023, 03:53 AM. -
Hello, sorry for the late response.
UTP cables from CCTV are in the same metal cable tray as power cable for outside lights. they are separated about 10 cm from each other, but I cannot avoid that because it is the only place where CCTV camera cables are entering house.
In the past there was a situation where the fuse for the outside light was blown and after that TVS protection diode diode on NVR inside the house was short circuited to the ground. So I concluded that this was how surge created in the lights got transferred by induction to the UTP cable.
Anyway, I'll try to replace...Leave a comment:
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Hello and thank you for your answers.
[USER="103682"]diif[/USER] The power (230 VAC) input is unlikely place the surge woud enter. This already on APC 750 VAC UPS device. The place to enter is via ethernet cables tthat lead to cameras. The cameras are PoE which means each port of NVR supply 48 VDC.
[USER="15329"]stj[/USER] It has TVS protection. In fact I already had a situation where TVS diode got shorted. I don't want to open device to solder anything, I thoutght it would be better if there is a cheaper device like PoE switch in front of the NVR device, so I...Leave a comment:
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Protect NVR device with PoE
Hello, I have a setup with NVR 16 Canais H.265 1080p HD PoE+ - TRENDnet TV-NVR416 that is using 10 cameras, some are outdoors. What would be the best way to protect NVR device from power surges? All ports are PoE so the NVR supply power to the cameras. NVR is pretty expensive so I would like to protect it somehow. Should I use some kind of switch that needs to be connected to the cameras, so it could "take a hit" if there is a power surge. Thank you! -
Thank you CapLeaker, this is the way I'm going.Leave a comment:
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Thanks for reply.
I'd like to try one more thing. NVR is supplying power to the camera via ethernet wires (POE). I can see according to the pinout that POE DC+ are wires 4 and 5 while DC- are wires 7 and 8. Therefore, I will cut these wires just in case, and use 12 VDC separate camera supply. This should work if the rest of the mainboard is OK. This way only data wires will have actual contact to the port on the NVR/DVR device.
This way I think, I can safely test whether mainboard survived or not. It shows some signs of life when connected to 12 VDC separately, but no signs...Leave a comment:
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Hi CapLeaker, that is very good idea. I will order one used PoE switch, it can serve even as "PSU" for my IP cameras.
In the meantime, I did some troubleshooting and would like to hear your advice. Since camera can be both supplied by PoE and 12V DC I guess this part of input PSU is somewhat "redundant".
Please have a look at the attached picture.
I have found one ESD/TVS protection diode shorted to ground and this diode is removed. This diode has label: B58C2, so I assumed it is BV-SMBJ58C2H diode. This diode is removed from the board....Last edited by Adenitz; 11-28-2023, 01:31 AM.Leave a comment:
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HikVision camera troubleshooting
Hello to all,
I have a very similar problem to what is already described herein this[URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-game-consoles-other-weird-devices/66453-troubleshooting-a-hikvision-poe-camera"] thread.[/URL]
The model is DS—2D2123. In normal operation the camera is forseen to operate on PoE. There is additional connector 12VDC. There was a power surge caused by a short circuit on nearby power line 230VAC cable for light was next to ethernet cable, so Camer has no power after that. I have... -
Clean ME region - a bit of theory
Hello laptop repair experts,
can someone plese, help me understand the significance of cleaning ME region in a BIOS dump file?
I know that Manegement Engine (ME) data is part of BIOS/UEFI firmware. I know that it contains some HW specific data for the particular laptop.
What I don't know, why do I need to clean ME region if I try BIOS dump file from another laptop (of course same type and model). I'm not sure if this is only because of the serial number (not sure if that is stored in ME region at all).
Recently, I had a two cases where laptops (one is Lenovo Idepad... -
Re: Properly connect CPU fan
Update:
It appears to be a sensor wire. So the question is how to properly connect it to the frame without destroying it? I guess using solder iron would destroy it.
I have found an explanation of this additional wire here on this [url=https://youtu.be/Z1dV-2fA98M?t=410]yt video.[/url]Re: Properly connect CPU fan
Update:
It appears to be a sensor wire. So the question is how to properly connect it to the frame without destroying it? I guess using solder iron would destroy it.
I have found an explanation of thisLeave a comment:
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Properly connect CPU fan
Hello,
I need to replace CPU fan and the replacement part has one free wire that is not connected to the connector. At first I thought that it has broken from the connector, but this is not the case, since it can be found on the pictures of brand new fan on ebay.
Is this normal wire or it has some special purpose in terms of sensing the temperature or something?
It seems that this wire is just soldered on the metal of the heatsink.... -
Re: Properly connecting power to the motherboard
Thank you Yolofolkss,
good to know these numbers. Yes, I do have modular PSU and I connected the cables with great caution.Leave a comment:
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Properly connecting power to the motherboard
Hello guys,
I have a brand new motherboard Asus TUF X570, that I just installed into chassis. Now I need to connect the power connectors properly. There is thing that confuses me and I want to double check, because I don't want to make any mistake.
Please have a look at the attached picture. This is extract from the manual. While 24 pin connector is obvious on the right hand side, EATX12V2 and EATX12_1 are not that obvious. I pretty sure it is power supply for the CPU. Now, from the PSU there are both 4 pins and 8 pins connectors. Normally, motherboards have only one of the...Last edited by Adenitz; 01-09-2023, 07:19 AM.
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