3GS white Screen, another SOLUTION! – iphone mobile problem

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3GS white Screen, another SOLUTION! – iphone mobile problem

On January 25, 2015, Posted by , In iPhone, With Comments Off on 3GS white Screen, another SOLUTION! – iphone mobile problem

3GS White-Screen another solution:


Check the LCD-Boost-Voltage Circuit! You MUST connect the LCD to check this Voltage!

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PS: Dont look exactly on this Board, i took it from my Spare-Parts Box title=big

No Comment so far:

  1. TechGuru says:

    title=smilethanks a lot in my case this test point where must be 5.5V was water damaged ,your post to be helpeded to me

  2. TechWorld says:

    this points must short ,on my board was damaged

  3. ExpertBuddy says:

    I have the same problem and I mesure 4,6 volts at this point. What is wrong now?
    Thanx in advance…

  4. ExpertBuddy says:
    Quote:
    suhari
    this points must short ,on my board was damaged

    Where can you see, that there has to be a connection between these two points?

  5. Wela says:

    Check the Resistance to GND at this point whitout Battery connected and post Result. Maybe the Capacitor has a little short and pull down the voltage. I had this also 1 time.

    Quote:
    Erling
    I have the same problem and I mesure 4,6 volts at this point. What is wrong now?
    Thanx in advance…
  6. newComer says:
    Quote:
    kostelectronics
    Check the Resistance to GND at this point whitout Battery connected and post Result. Maybe the Capacitor has a little short and pull down the voltage. I had this also 1 time.

    Thanx for reply. I mesure 100 KOhm. Is there a way to troubleshoot some values?

  7. Wela says:

    Can you give external 5.5V there for testing? Remember, you must disconnect the battery before you try again. Once booted Along without success, you want to reset the board!

  8. TechGuru says:

    iphone 3gs lcd ways solution

  9. TechWorld says:
    Quote:
    kostelectronics
    3GS White-Screen another solution:

    Check the LCD-Boost-Voltage Circuit! You MUST connect the LCD to check this Voltage!

    /

    PS: Dont look exactly on this Board, i took it from my Spare-Parts Box title=big

    hi ive a iphone 3gs Along with Along withe screen it turn on but i cant look only Along withe touch screen it not work but the phone is on and work if i call the phone it work ! if i connect to itunes ( itunes work and look phone )

    ive cheked this another test poing and when i start the screen the voltage it is 0v what i can do ? where is the problem ?
    thanks for support

  10. ExpertBuddy says:

    Your LCD is good? If not, you have also 0V there.

    Do you have a short on this line? If not, check for +VBATT at L12_AP first.
    Look at the schematics, this is a simple circuit! title=smile

    BR Matthias

  11. Wela says:

    lcd is good ive try to nother iphone3gs and work good
    short where ? ive look +vbatt on L12_AP is in this pic ? lokk th pic and ive mesurated 3,8 volt
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    Uploaded Along with ImageShack.us

  12. newComer says:

    pls want hel for this it is right 3,8 v in this point ? if ive not 5,5v in the capacitator where i can found this voltage in the board where start this voltage

    thanks i wait

  13. Wela says:

    The Voltage starts there! Check also at C242_RF

    Look at the schematics! Its so simple…

  14. Wela says:

    ok simple but im a beginner yung technics title=smile and i want to be directed to the right way 😛

    now look this pic ive cheked
    /

    Uploaded Along with ImageShack.us

    in this case i want replace u20_AP right ?