Recent content by jb23

PPBUS 8.2V was with battery (well it goes from 8 up to 8.57 and then drops to 0V before coming back again when battery connected? Is that normal?). 8.6V with battery disconnected. My shipment of 820-00165 donor boards finally arrived and I put another SMC on - same symptoms as when I started...

EDIT. THE SMC I USED HERE WAS ALMOST CERTAINLY AN 820-3437 BY MISTAKE. NOT AN 820-00165 OK so I tried another SMC off a donor board - absolutely dead - solid green light on charger after 3-4 attempts and 100% sure it was soldered correctly. I've run out of SMCs for the 00165 so I've ordered...

PP3V3_SUS is 3.3V BIOS traces look good. Will do sorry Duke every time I do this you ALWAYS tell me to put back original BIOS. I'll learn one day... I'm pretty sure it was an SMC from an identical board but in all honesty it came out of a box I previously labelled rather than straight from a...

Hi I have an 820-00165 in with no liquid damage and nothing looks burnt but board wasn't turning on. Checked around and is missing PM_SLP_S4_L I have a clock signal, S5 voltages and PPBUS_G3H. Amber light on charger and PP3V42_G3H fine. However I only had 1V on SMC_PM_G2_EN. Replaced SMC and I...

TROLLED BY A U1950 ISSUE AGAIN!!!!!!!! Replaced and got a chime this time :) If anyone is interested in my reasoning I had 1.3V on PM_PCH_PWROK instead of 3.4V. All should be good now thanks can mark this as solved. Again most of my posts are me just talking to myself but it forces me to think...

Replaced U8000 and have 3.3V on PP3V3_S4 but still no video/chime.

Had an 820-3476-A that wasn't detecting the battery and had loads of green crap around the J0705 area. Customer decided to buy a replacement battery and plug that in without cleaning any of the corrosion! Anyway I ultrasonically cleaned the board and still had no battery detection and would not...

U7400 area looks good but saw slight red area indicating burn on pin 1 of R7425, U7400 traces look good but will check all of them with the multimeter to be sure. Replaced U7400, R7425 & C7425 - no change. Resistors in that area all measure good. Could it be something on the 1.35V side of the...

Hi Guys, Got an 820-3476 that was liquid damaged. Fixed this and was working fine but it's come back a month later with a beeping RAM issue. Checked voltages and I get all main power rails and machine in S0 state except I'm missing PP1V35_S3 (0V). My U7400 readings are as follows and can't...

I might have been trolled by a cheap chinese trackpad cable (original was torn). Pulled another one out of a working machine and I get 18V on PP18V5_S4 :D

[SOLVED]820-2915 No Trackpad. Keyboard only works once trackpad disconnected and reconnected Liquid Damage. Someone cleaned it up before me so couldn't see where the spill was on board but there were red probe points on a lot of the WS_KBD points, below U5010 area and below U4900. Came in...

Put back original U6100 after I got it to boot with the 2nd SMC replacement. Thanks for the help - everything seems fine now and ASD doesn't flag up anything to be concerned about. Job done :)

Will post voltage readings later now it's working and what behavior has changed in comparison for reference if anyone else is having this problem in future. But you can mark this as solved for now.

Tried 3 different U6100s: 1 x original, 1 x from dead board from aliexpress, 1 x from dodgy eBay unlock people. Same symptoms on all of them. I replaced the SMC again with another one off a donor board: CHIME! Backlight and video output fine :D I figured something weird must be going on between...

Following on from that In my very unscientific test I get the same slow blue pulsing SanDisk USB light on a known good MacBook Pro before the chime/screen comes on (after that the light changes to a different 'on' pulse) measuring 0V on L8300 and have no output on HDMI or displayport so I'm...