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This one has no liquid, is clean and just died one day on its own. Customer powered it off and it never powered on again. I 've checked all these signals for PM_SL_S4_L and they are present. PPVRTC_G3H RTC_RESET_L PCH_SRTCRST_L PCH_INTVRMEN PCH_DSWVRMEN PCH_CLK32K_RTCX1 PP3V3_S5 PM_DSW_PWRGD...

Reverse diode mode reading on 3V3_G3H is normal 1.240 and comparable with other working boards. Yes diode mode 0.041 on SMBUS_SMC_5_G3H_SCL was solved it was D6950 shorting partially to ground. I decided to inject 5V on U6990 Vin and enable. It produced 3,4V when 5V was applied after D6905...

Liquid damage on this one, I found it difficult and time consuming. 1) It had a full short on C6990 PPVIN_G3H_P3V3G3H, replaced the cap and short gone. 2)Next, it had PP3V3_G3H low voltage around 2.2V. Diode mode was showing 0.340 very similar to other working boards however resistance to...

Hi there, this was a liquid damage with PPBUS shorted at u7430 (Pin 5 CPUGT_BOOT2_RC was burned shorted with ground along with pin 6 PPBUS_HS_CPU). There was also minor corrosion at other spots like PMIC an TPS51980. Replaced U7430 and short gone. Cleaned also corrosion everywhere. The board is...

Sorry I was unclear in my previous post. I meant it is solved :cool: 20V is back battery is charging now and all ports working now.

So I started by removing U3100 because on this chip I2C_UPC_SDA corresponding ball is sitting next to 2 GND balls and indeed that was the bad soldered chip. Reballed again cd3215 and it is good to go now. I learned at least that a shorted I2C_UPC_SDA line will cause these behaviour: 5V...

Hi 2informaticos! I inspected U2890 and there was absolutely no corrosion, checked all the spi/rom resistor and traces one by one from U2890 and the one for CD3215C00. And yes I do get 1V1 LDO on each CD3215 when the corresponding port is plugged in. I decided to check the scl/sda bus between...

No liquid at all on the audio board/flex and I also tried with another audio brd/flex just to discard any issue but no difference. While I was going to measure the diode mode as you asked me to do I charged the battery with another test board and surprisingly the patient board is now booting...

Got this logicboard with liquid damage, initially both CD3215 were shot, first one with one LDO shorted and second one with PP1.8V_SLPS2R shorted and an LDO shorted. First port was 5V 0A, second port was 5V going 0.2 to 0.43A. Replaced both CD3215 and I have no more short. Board is now stuck...

I know this thread is exactly 2 years ago, I came across the same exact symptom. It turned out being a broken trace on AUD_IPHS_SWITCH_EN between a test pad and U2152. The test pad is next to R6880-1 / U6880-3 (under the annoying foam). U2152 doesn't show up on boardview but it's the same on...

This board was liquid damage, no power, with the lcd flex burned, connector on the board is intact. I Fixed the liquid and managed to get the board to boot, however there is backlight but no image. I tested different screens known to be working. I also ruled out lcd flex cable, ssd, pram and...

I received this logicboard with water damage. Initially it was stuck at 5V, ISL6294 had to be replaced and I restored the sensing resistors and traces witch bring back 20V and it is now able to charge a battery. Without the battery it stabilizes to 0.40A and cycle again . The fan spins very...

Oh no problem at all. I was able to simulate the same issue with a known working board by preventing PP0V9_TBT_X_SVR and PP3V3_TBT_X_S0 to feed U2800, I had the exact issue. Suprisingly nothing is reported in diagnostic mode. So I just reballed an another U2800 from a donnor board and...

I soldered a wire from J4801-pin 13 and I am measuring 3.3V on TPAD_SPI_CS_CONN_L with trackpad connected while logged in macOS. Just in case I tested with another set of trackpad and flex cable and I have the same results.

I’ve just compared diode mode values for tpad_spi lines with known working board and they are the same. Pull-up resistors related to tpad on page 16 are all within specs according to values shown on schematic. Should I replace again U2800 or that has nothing to do with HDMI/usb disabled on...

Yes i have 00840 board with the chip present and it looks good. And am using the 00875 schematic and boardview on witch the chip doesn’t appear. USB mouse is working only on the boot menu same as the detected external usb boot drives. When the MacOS is launched the usb mouse is disabled.

No I can't start from the external disk on boot menu. When I start an external disk OS I see the apple logo with the progress bar at let say 60% and I get the Apple prohibitory sign, tested with different volumes (Catalina, High Sierra and Mojave) they all finish with the prohibitory sign. I...

No water damage, this board was not powering up because it had PP0V9_TBT_X_SVR and PP3V3_TBT_X_S0 shorted to ground. Removed R5640 to isolate PP3V3_S0 and board powered on fine and charged great but obviously no usb Data or HDMI output. I replaced U2800 with a preballed one and put back R5640...

This board came with liquid damage on the ports side, the flex and the connector (port A portion) on the board were burned and shorting the 20V rail. I Replaced the flex and the connector on the board and the short went from the 20V rail. The laptop boots ans charges. However when charging the...