Recent content by adrko

A2992 stuck on restore exclamation mark after liquid damage Lots of damage, mainly in 2 areas. around U6070 and on the other side of U7700 Also U5000 (Juno - Secure Element) which concerns me most. I took it off, cleaned and reballed it. Am I correct with guessing this is critical and...

Following your advice - I injected 1V to PP1V2_S2 and WiFi chip (UL000) heats up. PP1V8_S2 also goes there. It took almost 1.6 amps So I suppose motherboard is as good as dead, UL000 is married to the CPU, right? Unless I drill it where the hotspot is and hope for a passive component inside...

Yes I have a decent thermal cam. I didnt want to start injecting voltage right away. And I see both PP1V2_S2 and PP1V8_S2 are shorted. Right now I removed both U8100 and U7700. Shorts remain. I suppose I should not risk injecting 1V to PP1V2_S2 since it goes directly to the CPU But I will try...

A2992 - liquid damage - PP1V2_S2 2.6ohm short. Booting motehrboard has 3-4kOhms resistance on this line Damaged areas were kb backlight, speaker aplifier chips and vicinity of U8100 PMIC. U8100 was replaced after I discovered it was shorted. 5V 0amp - motherboard out of the assembly 5V 0.4 amp...

I have decided to do motherboard replacement instead. I also put both CD3217 back to working donor, they work fine - the position does not affect them. I also tested it by swapping places again. They work fine and mac is charging fine. Thank you for your help, I might try to get back to this...

I am very confident in my job with CD3217, but I found one potentially oxidized pad under UF100, on VCC3P3_ANA

Understood. But after I switched UF400 and UF500 around the behavior is exactly the same. I'm trying to switch around UF00/UF100 now

Hello Thank you for the reply. I most likely did not maintain the position of the chips, neither CD3217 nor UF100/UF000 Switched 3217 around and still same behavior with bare board on the bench. When board in the topcase with battery plugged: 1. Connectred to port parallel to UF00: - stays...

A2337 - looping from 5V to 20V Was connected over Belkin or some other adapters via HDMI, to a projector that has failed. It started with power cycling on both ports, when it gets to 19-20V power meter shuts down and goes from 5 to 20V again I was hoping for an easy win and just replaced...

The damage on the original PMIC: https://photos.app.goo.gl/xcvCTemtQdqjMZUFA

PPBUS_AON fluctuating on the desk without anything connected U8100 LDO: VIN_LDO - PP3V8_AON_MPMU_ISNS - 3.8V stable PP3V3_S2 - 0.7-2V - cycling PP1V8_S2SW_CLVR_VDDC1_LDO - 0.7 - 0.8 - 1.8V - cycling PP3V3_AON - unstable PP0V8_S2_CLVR_VDDDIG - 0.34 - 0.60 - 0.79V - cycling PP1V8_AON - 1.8V...

Device was liquid damaged Unfortunately it supposedly was in 2 repair shops prior and has signs of a diy attempt. Nothing too serious though. It was probably "tested" and supplied power while missing 3 bigger and 1 small caps on PPVIN_P3V8AON_ISNS line, in Q5800 and Q5820 vicinity After...

Nothing seems to work Got image on external only when booting to recovery/selection screen by holding power button. Otherwise it doesn't want to display to external, it used to without issues when I backed up data, not anymore. Voltages present, backlight is around 12V, same as working A2442...

It worked fine, I know mac is booted to MacOS because I can hear the chime when connecting thunderbolt screen. I will check with hdmi also.

A2485 820-02100 Never liquid damaged, never dropped, never opened before No image on the screen 90% of the time. Basing on observation of backlight intensity: - ALS works - backlight works - I can adjust backlight via backlight keys Macbook worked fine with external via thunderbolt. Got...