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Board is not booting this way. Symptoms are the same LED on pen drive with OSX installed lights up but no flashing (there is power but no activity)

Yes USB mouse lights up PRAM reset is not possible

OK. But shouldn't they come back high ? I have 3.42V on pin3 of U1950 It is the same issue without LIO flex

Got this one in saying no display. After reseating the battery the machine started. Ran for 24 hours. Next day it has shut off. I tried to start it again but now it is not booting. It has no liquid. Symptoms are fan spins then stops then spins faster and faster. VCORE is ok at 1.8V all the...

Thanks for the effort. Customer got another board. I still have this board here and I will post again if I ever get back to it.... Thanks again

Took another codec chip from another scrap board. Reballed again. Replaced again. And now it is working

Hi guys I got this 4924. It came in with no chime and no sound and no audio devices shown in audio settings. No liquid. Just stopped working one day. I opened it up and the Cirrus audio chip got a hole burned in it. So I just replaced it. This brought the sound back but at low volume. I made a...

I will double check it and get back

AP_RESET_CONN_L = 0 (3.3 when working) P_CLKREQ_L = 0 (3.0 when working) SMC_WIFI_PWR_EN = 3.4 CLK100M not present

No corrosion at U3550. Also PP3V3_WLAN is ok at 3.3V all the time both when the machine detects but also when not detecting the WiFI card.

Looked clean yesterday when inspecting from the top. I’ll have a closer look at it from the side later today.

No liquid. According to the customer WiFi just stopped working one day. No corrosion to be found after inspection. It has been to another repair shop who offered a logic board replacement. Only thing I noticed when taking apart was that the WiFi card was a little bit looser than normal when...

I have this 00165 that won’t detect WiFi card. After a PRAM reset it detects and works for around 30 minutes and then goes back to not detecting. I can then make another PRAM reset and it works again for another 30 minutes and the story continues over and over. I already tried another known...

At least now you’ll remember that you cannot boot older systems that it was “born” with :-D

Do you have the computer with you ? Because I don’t fully understand your clients message. Is it only external display that’s not working or is it also internal ? If it is only external display problems you need to check everything not board realated first. Such a as try another external...

Don’t use comments as replies as they can easily be missed. First thing you did was it trying a known good display or was it to test with external screen while internal display disconnected ?

What is the option menu ? Did you try to fully boot and log in ? If not then try as that can bring the backlight back.

You checked the board but you are not mentioning if you checked with another display. If not then start there. Don’t diagnose the board before you are 100% sure it is a board issue. It could also just be a bad lcd-cable. If you don’t have a known good display at hand then start with...

Start by resetting NVRAM/PRAM to see if you get the chime and check if it is just a missing/corrupted OS

sjword I assume :-) Always suspected it was you... or am I wrong ??