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  1. pharaon

    dim LCD laptop screen

    does anyone know what B1,B2,B4 are? their both sides are shorted to each other but not to the ground. dunno if it's fuse or what
  2. pharaon

    dim LCD laptop screen

    that's what i exactly did before posting this topic and the short is on the display board now what i'm really looking for is what other component that might cause that short i also watched this and also this one they test component in diode/continuously mode but my issue the shorted is in...
  3. pharaon

    dim LCD laptop screen

    what do you mean
  4. pharaon

    dim LCD laptop screen

    dell latitude e6420
  5. pharaon

    dim LCD laptop screen

    they are microscope's pictures that's why only the center got excellent resolution, microscope can only show small part of the board..but it's good to check very tiny things like IC number and etc those are all the numbers and text on the PCB board
  6. pharaon

    dim LCD laptop screen

    d1,d2,d3 none of them is shorted i attach better pic and another two pic under microscope for better view hopefully
  7. pharaon

    dim LCD laptop screen

    that made sense on the picture could you show me what or where to check and how to define smd zener and smd rectifier diode
  8. pharaon

    dim LCD laptop screen

    i have picture but no back light , like the brightness of the screen is set to 1 or 0 i upload the picture i found 3 capacitors that both sides are shorted to ground ...when i removed from the board i test it and it was working fine giving me 4+ for capacitors measure...but it's place on the...
  9. pharaon

    need help to find alternative IC

    cool so instead of that xl1509 i'll use 7805 voltage regulator with heatsink and two capacitors how hot do you think it will get if i use it as car charger? would it melt the plastic case of the original charger if i put it inside? what about NCP 1117 which would be better for such a use? will...
  10. pharaon

    need help to find alternative IC

    how about if i use 7805 voltage regulator for the car phone charger i'll get 5V output but what about the current
  11. pharaon

    need help to find alternative IC

    i don't think suck website can deliver to my country and if it does it would be high cost but really thanks for your help
  12. pharaon

    need help to find alternative IC

    i have this IC for my car phone charger "XL 1509" which i can't find a replacement part for it so i wonder if anything can be as alternative for it
  13. pharaon

    Replace old transformer with rectifier bridge

    why not what about this 230 v ac to 12vdc without transformer
  14. pharaon

    Replace old transformer with rectifier bridge

    i like to learn that's why i ask about other ways i think i can use X-Rated Capacitor to get 12 dc V
  15. pharaon

    Replace old transformer with rectifier bridge

    so there's no electronic piece can replace the transformer? what about the circuit that doesn't have any transformers and convert 220 VAC to 12 VDC???
  16. pharaon

    Replace old transformer with rectifier bridge

    the winding wires already cut
  17. pharaon

    Replace old transformer with rectifier bridge

    can you explain
  18. pharaon

    Replace old transformer with rectifier bridge

    and the capacitor is 2200uf , 16V so if it's not possible to get another transformer what can i do to fix it?
  19. pharaon

    Replace old transformer with rectifier bridge

    i have this pc speaker with failure Transformer that i want to fix so how about replacing the Transformer with rectifier bridge that give me 12V DC is it possible and if it's what piece should i use
  20. pharaon

    Is it possible to fix old PC monitor

    any one know Q103 "what piece should i get for it"?
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