Recent content by iFix

I replaced R8431/2 , even though they were measuring good and I got backlight. Also I replaced Q8400 to future-proof since F8400 was also burned

Nothing obvious and the big caps the one blown I replaced. I will recheck everything and revert

BKLT_SCL/SDA - both 4.5v BKLT_EN_R - 3.3v

All rechecked and they go to the places where they needed to and I measured the resistors themselves and measured the values by schematics , all good

Yes, I do get 5V_S0SW_LCD on the connector, measured on C8512, of course with LCD attached

Yes I tested with another one also, but as I said it's not boosting with any up to 50v

Also, I rewired the LCD backlight flex some time ago and it's good checked, and I get voltages to it. No other corrosion on the board. Value on PPVOUT_S0_LCDBKLT is 0.700, unlike other boards which are higher

Hi guys. I have this A1708 with a backlight issue. There was corrosion damage on U8400 and surrounding it. I replaced U8400, C8471(shorted), and C8441 and all resistors are fine. I was getting on PPVOUT_S0_LCDBKLT 12v, but then I changed also D8410 and Q8410, just in case. I measured of course...

C7801 was shorted, i removed it and now it's stuck at 5v and around 0.04a but at times it goes 0.2a

C8315 I get 3.8v PP1V5_VLDOINT_MPMU - 1.5v The lowest resistance I get around U8100 is 033 on L8100 and on U7700 I get 018 on L7740 I noticed that PP5V_BSTLQ_VOUT_SPMU is shorted, and when i inject voltage 0.5v the wire heats up but no components on that line

PPVDD_PMU_LDO_PREREG - 0v PP1V5_VLDOINT_MPMU - 1.5v PP1V25_S2 - 0v PP1V8_S2 - 0-0.2v up and down PP5V_BSTLQ_VOUT_MPMU - 5v MPMU_BSTLQ_LX - 3.8v

U8100:

U7700: PP3V8_AON_VDDMAIN - 3.8v PP1V5_VLDOINT_SPMU - 0.3v - diode mode 237 PP1V25_S2 - 0v - diode 258 PPVDD_PMU_LDO_PREREG - 0v PP1V06_S2SW_DRAM - 0v PP0V88_S1 - 0v PP1V8_S2 - 0-0.2v up and down PP0V88_S1 - 0v

Now they are like this: PPBUS_AON 11.9v-12.2v going up and down 3V8_AON 3.8v

Hi. He came back, I replaced U5700 and U5200. The pulsing of U5200 now it's not there and I have power cycling 5v and 0.04-0.05 but it goes at time 0.100. PP3V8_AON_VDDMAIN is 3.8v :unsure: