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USB pendrive flashes a few times each time I plug it in

The light on the mouse I use is bright and then dims after 5 seconds. I think this is normal as it does it on my iMac just the same. DP_INT_HPD is 0.00v I can't see any pulses or maybe my multimeter is too slow.

On U8300 I get 0v on pin 1 (EDP_PANEL_PWR) but I'm getting 3.3v on pin 2 and 3 R1431 is the pull up resistor for EDP_PANEL_PWR and its supposed to be 100k but tests as 82k on the board. Do you think this might be an issue or is something pulling that down a touch while its attached to the board?

Maybe LP8550 issue or would that still initialise the display if that was faulty?

I don't have a way to test external at the moment but it does power a USB mouse. Tried another screen assembly also

OMG! I've been testing with the wrong charger. Such a noob sometimes, I should have known better. Now turns on, fans normal, CPU heats up but nothing on the screen. No backlight or screen activating

I have an 820-00165 with no fan spin after liquid damage. Orange light and SMC reset goes green and back to orange. Liquid damage around U5110 cleaned up. PPBUS_G3H = 8.52v PP5V_S5 = 4.98v PP3V3_S5 = 3.32v PM_SLP_S4_L = 0v SMC_PM_G2_EN = 3.4v PPVRTC_G3H = 3.3v PM_DSW_PWRGD = 3.4v PP3V3_SUS =...

Fixed and I now have a backlight. Thank you @2informaticos

Yeah on closer inspection, I’d say that was f’d

I searched XW7720 on the forum but couldn’t find a picture of it. I’ve attached what I think might be the correct trace but I’m probably wrong.

Hi I have a liquid damaged Air with no display. I've changed over a slightly burnt LVDS connector, change a couple of ugly looking caps and replaced U7701 and tried another screen also. I'm still getting no backlight and I'm stuck. I'm getting a display though 8.5v on L7701 LCDBLT_BOOST 8.5v...

Looking at the area again.. it looks like a capacitor is half dead on one side.

Thanks for the reply 2informaticos. It?s an 820-00923-A unfortunately as I believe that?s the first of no schematic territory :(

Hi, I have an A1706 that has been given a little drink at the side of the keyboard right where the SSD chip is. Turns on but doesn?t see the SSD I took the board out and cleaned the small amount of crap near the SSD. Put the board back in and checked it. Now it sees the SSD, boots and runs...

Well, someone switched my good battery and I wrongly assumed the voltage was being pulled down :o Turns out it needed a new battery :p Sorry for wasting your time folks.. thank you for the help

Thanks for the reply JohnB8812 - Yeah I forgot to mention I checked 7005/6 they both check out fine 9.9ohms, 4.8ohms Thanks 2informaticos R6950 is good at 10.01k Q7155, battery only, not in chassis (F7140 still removed) = pin 5 = 3.197v pin 1,2,3 = 3.178v < took a while to climb to this...

R7150, 7151, 7152, 7120, 7121, 7122 all test fine CSON,CSOP 17-18 on U7100 = 3.1ohms CSIN,CSIP 27-28 on U7100 = 19.9ohms SDA,SCL 10-11 on U7100 = 3.99k

Hi, I have a 820-3437 MBA that came in as not turning on. (no liquid damage but just didn't turn on one morning) Found a shorting cap C7431 (PPBUS_S5_HS_COMPUTING_ISNS) Thought it was going to be very easy as it was replaced and diode tested okay. Turns on now and boots, sees the battery serial...

Actually it does work when I short pin 5 to ground.. new keyboard it is then 2informaticos Thank you for your help

Shorting pin 4 and 5 on the keyboard connector doesnt seem to work nor does shorting pin 1 of the non existent SW9988 Edit: For anyone else reading this, SW9988 pin 1 doesn't seem to have its pad connected to SMC_ONOFF_L so it doesnt work as a replacement for a power button when shorted to...