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  1. pharaon

    mouse x7 xl-747h randomly stop responding

    hello every one i'm having an issue with my mouse mouse x7 xl-747h i notice that the mouse stop responding randomly for seconds or minutes then work again. i found out that when it stop responding the reason is the laser light is not working what cause this issue and how to fix it
  2. pharaon

    help fixing fluorescent lamp circuit

    This is an electronic neon bulb circuit. Two transistors No. 13003 were changed. Two quarter-watt resistors, 15 ohms. The rest of the resistors and diodes are good. When connected, the bulb lit for a few seconds, then a spark came from the two transistors 13003, and I found that they were...
  3. pharaon

    UT61E multimeter AC measurement issue

    My UT61E multimeter gives wrong read for 220V AC Is it fixable?
  4. pharaon

    reliable motorcycle rectifier circuit

    my motorcycle rectifier circuit got fallen and extract more than 14.5 DCV when i accelerate like 15,16,17,18,19,20 DCV which cause the motorcycle battery to dry so i would like to make external circuit to maintain such increasing DC voltage into steady 14.5 DCV anyone can help me with diagram?
  5. pharaon

    help fixing audio amplifier no sound out

    it's USB reader and FM radio as well YT-326A no sound out it have TDA7057AQ IC how can i check if IC TDA7057AQ is malfunction with multimeter?
  6. pharaon

    Try to fix Electric Door bell

    i'm having this electric door bell that make bird sound it's not working the transistor is C945 i think the big resistor is burned, but i can't determine it's values since the middle color changed due to overheated
  7. pharaon

    Need Datasheet for this IC

    it's driver IC on Led Bulb Circuit
  8. pharaon

    how to properly connect fingerthump potentiometer

    i'd like to connect finger-thump potentiometer as on/off control + volume control to headphone speakers. i'd like to know the right pin-out for wires to be connected from the output jack
  9. pharaon

    find faulty compnent on ATX power supply

    it's ATX power supply i'm working on the issue is in 5V output, it drop to 3V when i connect it to 12V pc fan, and the fan keep kicking without spin i hear fry sound from this side of main transformer but can't detect exactly which component making the sound or responsible for not delivering...
  10. pharaon

    repair pc power supply

    i hope someone can help me fixing this power supply, when i try to turn it on the fan just move less than second then stop when i measure the voltage on the fan and try to start the power it show 15 V then fade to 0 right away. i tested some smd component , found short on the red circle...
  11. pharaon

    fixing Led lamp power supply

    i have 48 pair of led connected in series total of 96 LED,the circuit failed in capacitor C1, the IC is TA320 which i can't find any datasheet for it except this information from Chinese webpage Brand: Beijing-mode Model: TA3720 Package: SOP-7 Input Voltage: 100-264V Power range: 18W...
  12. pharaon

    Hp 2035 monitor Check the Signal Cable

    of-course i tried it on different computers with different cables and still the same issue which made me believe it's a hardware issue in the monitor it self i uploaded some pictures , hope any one can help me fix it what should i check first [MOD note - deleted excess photo double-ups]
  13. pharaon

    Is that a fuse or resistor

    Is that blown item is fuse or resistor, and is it possible to replace those SMD didoes with usual one?must the four bride SMD didoes be replaced or can i replace only two that is faulty with regular 1n4007
  14. pharaon

    advantage and disadvatnge of AC to DC converter circuit

    i would like to know what is the advantage and disadvantage of such circuit if it will be used to power on 12v fan
  15. pharaon

    measuring output current circuit ?

    is there a circuit i can do to test the maximum output current of device? like car lighter socket ? or mobile charger ? does the output current determine by the drained device or the output source value?
  16. pharaon

    led lamp failed adapter

    i have this lamp that start to dim and now no light so i opened it up and measure the output DC it was unstable from 4 to 16 DC Fluctuating value datasheet of the main ship and circuit schematic do you think it's the main reason? if it's and it's unavailable to get new one is there any...
  17. pharaon

    Satellite receiver Power supply higher voltages output

    This power supply output voltages is higher than it should be, what could be the cause Standard voltage actual voltage 23V = 32V 12V = 18.5V 3V = 7 V Next 3V = unstable 0.5 to 1.6 V 5 V = unstable 6.8V to 7V
  18. pharaon

    Help Fixing UT61E MultiMeter continuously beeping

    wonder if some one can help me with the multimeter failure, the beeping on the dc voltage is not normal also the continuously beeping on the diode test is not normal. i'v a video link showing the problem as well as schematic and photos for the multimeter board
  19. pharaon

    help fixing satellite receiver power supply circuit

    the board output is dead can some one help me track the voltage path through the board, so i would check what component is really not working , i'm suspicious in "power IC" or "photo-coupler"
  20. pharaon

    datasheet for this IC

    i wonder if anyone got datasheet for this IC , also want to know if it's possible to reprogram it i also wonder if such PIC PROGRAMMER USB SMD can reprogram it or does this one able to reprogram it K150 USB PIC Microcontroller Programmer
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