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iPhone no image error

Hello,

Greeting's to everyone. I am struggling with Iphone 6 plus. The phone turns on , is recognized by itunes and the backlight is working also..

But there is no image at all on the LCD.. Phone is not water-damaged - the indicator's look white and clean.

Also under microscope did not found any damage to board.

Could someone give me some hint's what to do next ?

Chestnut (U1501) ?

Update (04/05/2018)

Update.

I have measured up the lines which should be responsible for image..

PP_VCC_MAIN - 3,6 V ( measured on C1554)

P6V0_LCM_BOOST - 6V (measured on C1502)

PN5V7_SAGE_AVDDN - 5,7 V (measured on C1504)

P5V7_SAGE_AVDDH- 5.7 V (measured on C1577)

PP5V7_LCM_AVDDH - 5,7 V (measured on C1569)

PP5V1_GRAPE_VDD - 5,1 V (measured on C1541)

What i should test next ?

Update (04/06/2018)

Hello,

So i did a new measurements today again with fresh head.

The result is the same except :

PN5V7_SAGE_AVDDN - minus 0,37 (measured on C1504)

So i have a short on that line. So the options are for me :

1)C1504 ; FL2061; C2044 or can it be the chestnut himself?

Thank you for your attention.

Update (04/07/2018)

Hello to everyone,

Happily i was enable to find out the shorted caps (it was C2049) removed it from the board and voila image on lcd !

Big thanks to Minho for helping.

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Bu iyi bir soru mu?

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1 Yorum

I think it broke down. I had a similar situation with the phone. Everything is very simple bought new)

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Chestnut appears to be working well, now you have to check the LCM filters if you haven't already.

Block Image

Bu yanıt yardımcı oldu mu?

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10 Yorum:

Hello.

Thanks for the reply.

When i checked the FL2061 & FL2037 both ends were beeping with GND. So it means they are bad ?

On that line i cant measure the voltages unless the lcd is connected right ?

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When i checked the 1v8 line it was showing 1.8 on Filter and also from the LCD pin.

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FL2061 & FL2037 should not be shorted to ground and it contradicts what you said earlier about getting the proper voltages on PN5V7_SAGE_AVDDN & PP5V7_LCM_AVDDH.

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i will check the filteräs again tommorow with a microscope to be sure.

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Start by removing the filter and test to see which side is shorted. If it's on the Chestnut side, remove C1504 and test again. If the short is still there, Chestnut is bad.

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Since you are asking about a motherboard related problem I assume you've already tested with a good working screen.

Having backlight means that the phone it detects the screen and its sending data/image to be displayed.

Probe around the U1501/Chesnut chip for shorts, if none found replace the chesnut.

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