Recent content by highvoltage

I have tried DFU, but host machine did't recognize target machine.

never done DFU before. I'll have to search for instructions first.

Hi there, I have an A1990 (820-01814-01) not powering on. On all 4 USB ports I only get 5V and around 100 to 200 mA. (yes I know this is not accurate, but I only have one number after the decimal point at the moment) On PPBUS_G3H I get 12.27V What to check next? Thanks in advance

Checked continuity. Seems to be good. But I will give up this device, it's too time consuming.

Hi again, changed U6101 now. But still same issue.

One pad was ripped of: SPIROM_USE_MLB. I have to recreate it. And my fault: I have lost U6101 and I can't find it... 🙈 U6101 is called 74LVC1G99. It seems to be a 3-state gate in SOT833 package. I have ordered them now. Keep you updated...

R6110 --> 15 Ohm R6111 --> 15 Ohm R6112 --> 15 Ohm R6113 --> 15 Ohm R6114 --> 24.9 Ohm R6115 --> 15 Ohm R6116 --> 15 Ohm R6117 --> 15 Ohm R6118 --> 15 Ohm R6119 --> 15 Ohm R6120 --> 43 Ohm R6121 --> 43 Ohm R6122 --> 43 Ohm R6123 --> 24.9 Ohm R6125 --> 43 Ohm R6126 --> 43 Ohm R6127 --> 43 Ohm...

yes, pins 7 & 3 of U1950 and PLT_RESET_L are pulsing

Check for pulse at all big coils. L2920 pulsing L7750 pulsing L7310 pulsing L7320 pulsing L7630 pulsing L7430 pulsing L7560 not pulsing L7520 pulsing L7130 not pulsing L3095 not pulsing L7701 not pulsing Also check output rails from pages 57/58. PP1V8_S3 at R7829 is pulsing PP1V05_SUS at C7841...

I have checked PM_SLP_S3_L now. It's cycling every 4.2 second up to 3.44 volt. SMC bypass seems not to be working. I've tried to shorten SMC_ONOFF_L to GND while plugging charger in and hold it for about 5 - 10 seconds. no fanspin.

Hi there, I have an A1466 that suddenly went out. Magsafe turns green, then orange, but MB has no fanspin. An inspection under the microscope showed no corrosion, but the board was very dusty. I am using a cut off original Magsafe cable connected to my DC power supply. I am a noob in...