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There is no external display. The board seems to power on with fans spinning at a normal speed for 10 seconds and then the fans burst to 100% for 2 seconds before restarting the cycle. The J8500 reading from S-UEM2 shows pins 31, 33, 37, 38, 39, 40 all slightly high. I've attached a photo

Delayed response to your reply 2informaticos, sorry. Pin 1 & 3 are both .401v in diode mode. This seems normal as far as I can tell.

Liquid damage around J5100 and some on the LCD connector on the screen end. Removed J8500 ribbon as that was burnt at the screen end. Replaced the ribbon. ( PP5V_S0SW_LCD pin was burnt at screen end ) No short on this line. Cleaned area around J5100, connected board to a good lcd to test...

Thank you for your help 2informaticos. I waited for a new batch of CD3215B01 and it now works perfectly.. must have been two bad CD3215 in a row.

0.387 in diode mode so I think its not shorted. U9580 has PPBUS_G3H_SSD0_SNS = 12.5v P2V5_PGOOD = 0v P2V5_EN_R = 0v It seems from the schematic for TPS62180 that PGOOD is an output and the fact that it isn't getting P2V5_EN_R could be because of U9500 or like you say, SSD voltages aren't there...

PPBUS_G3H_SSD0_SNS = 12.51v PP2V5_NAND_SSD0 = 0.00v <<<<< shouldn't this be 2.5v? PP3V3_G3H_SSD0_SNS = 3.365v

Tiny amount of liquid damage in J4802 area, C6526, C7602 area and U8210 . Cleaned desoldered etc 20v 0.000-0.009v Checked with S-UEM2 and tests fine. PP3V3_G3H_RTC_X = 3.365v PPBUS_G3H = 12.51v PP0V8_SLPS2R = 0.788v PP1V1_SLPS2R - 1.095v PP1V8_SLPS2R = 1.788v PPVDDCPU_AWAKE = 0.747v...

Unfortunately I don't have a scrap a1534 board but I've been playing around and the board powers up on battery. Lights up gets PPBUS_G3H HS_Computing etc. If I plug in the charger while the board is powered by battery, the power meter stays blank as if no power is going through it. Does that...

PP3V3R3V0_AON 0.534v on both boards 2.974v bad board - 3.281v good board

in reverse it climbs up to OL - same as good board

The good board is slightly different but should hopefully be good enough for comparison Bad Board - 820-00244 Good Board - 820-00687 L7670 0.153v 0.313v L7690 0.346v 0.345v L7430 0.009v 0.014v L7410 0.009v 0.014v L7230 0.010v 0.015v L7210 0.010v 0.015v L7290 0.025v...

PP5v_S5 = 0.408 same as working board PP5v_S4 = 0.152 quite low (0.315 on working board)

PPBUS_G3H = 0.410 PP3V3_G3H = 0.333 same readings on the working board

Thank you for the reply 2informaticos. PP3V3R3V0_AON = 2.97v

Failed charge port - chewed up pins Changed the port but nothing past 5v - tested port on known good board and the port is fine. Checked CD3215B01 and LDO_BMC = 0v Changed CD3215B01 and still the same... changed again in case it was faulty chip.. still the same. Checked further and all LDO...

With U7800 removed I'm still getting those low readings on diode mode. Could it be anything else before I order a U7800? I expected it to alter the diode mode reading when removed

Fluxed, heated and gave it a few little taps but no change unfortunately

Maybe some crap under U7800 on the left side or under T2 chip?

Thank you for the reply 2informaticos. R7900 is no stuff for me but pin 1 is at 0.610-0.620v Coils diode mode: L7806 = 0.007v L7815 = 0.248v L7814 = 0.248v L7816 = 0.032v L7817 = 0.032v L7813 = 0.364v L7819 = 0.448v L7820 = 0.454v L7822 = 0.440v L7821 = 0.442v L7823 = 0.362v L7824 = 0.347v...

C7910 Pin 1 - LDO_Core = 1.463v C7905 Pin 1 - LDO0 - PP0v8_SLPS2R = 0.00v C7906 Pin 1 - LDO1 - PP3v3_G3H = 0.00v C7914 Pin 1 - LDO2 - PP1V2_AWAKE = 0.00v C7911 Pin 1 - LDO3 - PMU_LD)3_OUT = 1.80v