I found some metal components inside glass, labeled "SG" on PCB from old display, what's that?
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Less jewellery, more gold into electrotech industry!
Half of the computer problems is caused by bad contacts 
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Re: SG - what does it stand for?
spark gap. -
Re: SG - what does it stand for?
Another interesting component labeled PTCU. There are two coin-like pieces of metal inside...
What's that?Attached Filesif you find these attachements useful please consider making a small donation to the site
Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
Exclusive caps, meters and more!Hardware Insights - power supply reviews and more!Comment
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Re: SG - what does it stand for?
Photon Torpedo Control Unit #1
There are two of them in any StarFleet Attack Runabouts.
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Re: SG - what does it stand for?
Malmal's answer is funny, but not quite correct, electronically speaking. The component you have is a positive temperature coefficient resistor/thermistor unit, and these are used for current limiting tasks.
HuckComment
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Re: SG - what does it stand for?
I liked malmal's answer better...
I have them in my runabout...
veritas odium paritComment
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Re: SG - what does it stand for?
lol
it's called a ptc, it's used to power the degausing coil for a few seconds at power up.
after a few seconds the thing is so hot that the resistance increases & cuts power to the coil.
heres a tip - they do fail.
if you desolder one and it rattles - it's fucked.Comment
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Re: SG - what does it stand for?
It's supposed to have a cover.
Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Re: SG - what does it stand for?
Sometimes, spark gaps (SG) are called air gaps (AG).
Some may exist as exposed PCB traces.My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.Comment
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Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
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Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
Hello everyone!
Tonight I picked up a Samsung UN65NU6900FXZA with a curious issue.
Symptoms:
1) Plug TV in to AC outlet, stand-by light illuminates briefly and goes out.
2) TV does not appear to turn on
3) Backlights do not illuminate, voltages associated with backlights on Power Supply are not present
4) "Power on" terminal on Power Supply has 3.26v
5) "A13V" terminals have 12.9v
6) Stand-by test jumper on Power Supply has 12.9V
7) Optical audio jack on Main Board illuminates
8) With stand-by... -
Someone brought me a liquid metal damaged motherboard.
First I have removed alll liquid metal from the board.
0,75V_ALW was burned, and had to be removed and I have separated the layers until no short was on the VIN (B+) line and the output is no longer shorted.
Applying 0,77V on the output with my lab PSU make the laptop caming on and i running windows from USB drive SSD
There are 2 things that not working.
1. The WIFI card keeps turning off and on with an error code 43 and 10 abouth every 10 seconds
2. nvme devices are not detected on either of the 2 slots.... -
Hi all, Im working on a board, that my customer brought to another shop, and smeared liquid metal all over the board.
The laptop powers on, then shuts off. I noticed traces of Liquid Metal near the edge of the CPU, but I fear some maybe underneath.
Has anyone ever tried Ultrasonic cleaning, or compressed air to remove or agitate the liquid metal?07-11-2025, 01:47 PM -
Hello, everyone!
I have here a Schenker VIA 15 PRO, with this numbers on the board: PF 4NU1F V1.0 and P/N: MBPPF4NU18-F310 .
I took out the memory and the battery and the SSD.
So, in stand-by, only the board, takes 36mA. No power-button pressed at all, I can measure 1.8V, 3.3V, 5V. All coils present voltages except the two power rails for the CPU. The CPU is a AMD Ryzen 5 4600H.
After pressing the power-button, the current raises to 500mA and the two power rails for the CPU show up with 0.8V.
After several seconds, the fans switch-off and the board keeps powered...03-08-2025, 04:45 AM
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