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 FilesLess 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?
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... -
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 -
Hello everyone,
I bought an OLED65C1 refurbished TV back in 2022 from a shop. The TV is awesome, this is my first OLED and I really love it.
However I have an issue with the TV since the end of last year. I noticed when my TV is in Stand-By, sometimes the LED goes off then comes back on. When do so it seem periodical. It only goes away for 1-2 seconds, than comes back on. The TV NEVER turnes off, while it's on, so it's not overheating issue or electrical power issue.
I bought a service remote (MKJ39170828) and checked the menu 3. Power On/Off Status. I took... -
Anyone have a picture of this??
I took apart the recently repaired 60LN5400 and I'll be damned if I can find the internal metal stand back plate that goes with this TV..
I found the stand.. Can't find the plate to save my life...
If I can get a picture, I know what to look for..
Thanx
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