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  1. only_lonely

    Re: power surge kill power supply/motherboard

    the power supply comes with overvoltage protection, why it is still havin AC noise?
  2. only_lonely

    freq VS voltage

    oh..thanks your explain. so a good supplies will have a good capacitor also...
  3. only_lonely

    freq VS voltage

    what is the relationship between freq and V? does the freq really play a big role in power supply/electronics board. I got a lab test that require me to use a module to adjust the freq form 40 to 70 Hz, then observe the board (on /off). But i found that the board still can power on when i tune...
  4. only_lonely

    power sequence question

    so, if i want to enter the time for those voltage to power up my mobo. which spec i should refer to, the motherboard or power supply?
  5. only_lonely

    power sequence question

    need to conduct DC margin test using Agilent MAINFRAME ( have +5V,+3.3V,+12V,-12V,Power GD,+24V modules). then take out the power supply from my motherboard, connnect those modules to my board ,simulate the power supply condition. But the staff told me to calculate or figure the time for those...
  6. only_lonely

    dual switching power supply question

    oh i see. thanks. but,may i know whats the theory inside the power supply series,parallel and independ mode?
  7. only_lonely

    dual switching power supply question

    I have a motherboard, it can power up by 5V. But i found it the only way i can power it and boot into windows is using parallel mode (master must in CV,slave in CC).If i want to see the current flow, then i need to sum the readings from master and slave. If i use indepent mode (Master:CV) to...
  8. only_lonely

    12/24V cash drawer?

    I saw the spec of my cash drawer. Is 12/24 selectable port. Whats the difference between 12V and 24V? How do I switch it? and test out it? PS: Sorry if i ask a noob question.
  9. only_lonely

    need books for testing job

    Anyone here work as test engineer in computer/related area? Any website / books recommend to do testing job? As i am noob and newbie, need some guidelines. thanks.
  10. only_lonely

    How to use oscilloscope to analysis the audio signal

    Sorry,one noob question: where should i point at the board to see the waveform, n check the phase?
  11. only_lonely

    How to use oscilloscope to analysis the audio signal

    I have no idea on the audio test by using oscilloscope. Example: I play a music, and i use volume control to adjust the left and right volume. (Windows Audio/Sounds Properties) How to use the scope to verify whether the volume that i adjust is accurate. Anybody here, Pls help me. Thanks a lots.
  12. only_lonely

    line in?line out?

    sorry, i am quite confuse now. OK. Now i have a UNIT A which has 2 port, one line in port, one line out port (audio jack). Unit A has an internal left and right speaker. 1) If i have an external speaker to test the unit audio functionality, which port should i connect it? 2) If i have an audio...
  13. only_lonely

    line in?line out?

    So, if i connect an external speaker at unit A, that port which I plug is "line out" port. Then the "line in" port is when i play music at my PC,then i use audio cable to connect my pc to the unit A, to play the sound at that unit A. Am I correct?
  14. only_lonely

    line in?line out?

    I am doing testing job currently. While i looking at specs, quite confuse witht he word"line in" and "line out" port. May somebody here briefly explain to me. Thanks a lots!
  15. only_lonely

    LVDS and backlight cables.

    Does anyone here experienced make their own LVDS and backlight cables for LCD panel? I want to reconfigure my LVDS cable output because the connector is not campatible with my motherboard. What i should do? I have the datasheet for the panel and my motherboard LVDS pin out interface.
  16. only_lonely

    no clean and clean manufacturing process

    thanks. But, what is the impact/effect if i want to rework my board(clean process)
  17. only_lonely

    no clean and clean manufacturing process

    Can somebody briefly explain whats diff betwwen no clean and clean manufacturing process? Thks alots.
  18. only_lonely

    THE value in the circuitry

    this is the capture pic
  19. only_lonely

    THE value in the circuitry

    i got a circuitry. each resistor n cap have a value. but i don't what they  mean for example 30k/6/1  what is the 6 n 1 represent? 1u/8/10v what is the 8 represent? can someone help me? THANKS
  20. only_lonely

    anyone know this part no.?

    no... is really a regulator...not transistor. u can see it on the 945GMF motherboard. the 2sk3918 is a transistor. i really cant find thhis k3918 part
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