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Still no backlighting.

I replaced the u8500 and have 5v but still no backlight. Now the diode test is the same with and without LCD. PPVOUT_S0_LCDBKLT - 0v Can I connect LCD with a1708 ?

U8500 1 - 5.1v 2 - 3.3v 4 - 1.3v 5 - 0v EDP_PANEL_PWR_BUF_E - 3.3v

Backlighting is missing. Unfortunately I have no known good lcd. PP5V_S0SW_LCD 1.4V PP3V3_S0SW_LCD 3V3 DP_INT_HPD 3.3V Q8400 1- 0v 3- 12.5v 4- 12.6v Diodemode D840 (red probe to ground) pin1: 0.88 pin2: 1.2

usb active there is an image on the external screen PPVOUT_S0_LCDBKLT - 0v

I replaced two ISL95870HRUZ but one was from the motherboard 820-3662 (ISL95870). Now the MacBook boots but there is no image.

Strange situation. R7744 was getting hot. I removed it. The short circuit was still present. Later, U7710 started to heat up, so I removed it and again the short circuit did not stop. Now the U8110 is heating up. Should I remove it ? This is the first time I have this situation.

I have a macbook 820-01598 which has 20v but black screen and without gong. DHU passes without error but still nothing displayed. Trackpad vibrates, capslock does not light up. I found a low resistance on L 7670 - PP5V_G3S 6ohm. Can I perform a short circuit test ?

Can anything else be done ?

Still the same. I use ezp2019+. I also used the DS-809 but still no change.

Do you have a known good bios ?

Performs everything according to the instructions and still nothing Can I force DFU mode by SOC_FORCE_DFU up to 1.8v using the PP1V8_S4 line (R4035) ?

no image, cpu gets warm no chime . Touchpad vibrates but keyboard light does not come on. Board are clean. can't turn on dfu L7410/20/30 and L3500 0v PLT_RST_L 3.3v R3090/98 are ok

Revive device helped. I should start with this. Thank you

PP1V1_SLPS2R 1.1v PP1V8_SLPS2R 1.8v PP1V2_AWAKE 1.2v PP3V3_AWAKE 3.3v PP1V8_AWAKE I connected the board directly to the 12v power supply. not sure how to explain it but sometimes it is 1.8v and sometimes it is absent.

Can you send me a new working bios ? Will try again

Fan spins initially then stops then and does not respond to the switch. Capslock does not light up - although one time it lit up for me, but there was the same situation. Sometimes I have seen that it has a backlight. I checked the new good bios and still the same. 0v on L7410/20/30 L7210/20...

Thank you. Whether to start with G3H rails ?

I have iMac that does not boot. The power supply gives 12v. No response to the switch. I am looking for a schematic and boardview.

I replaced 2x CD3215s and I have 20v. Does this board boot without batteries ?