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I've not seen this first hand. This looks to me like a failed GPU but I thought the NVIDIA chips were solid... C9560 causing this? Maybe VRAM or the GPU or the MUX?

I tried replacing U4820, no change. Anyone please?

... Yes but with no PWM there can't BE any signal for the software to use to control the backlight.

I just moved R9704 off of the MUX pad and wired it to 3V3_S0. I do the same with the Air boards so as not to tie CPU directly.

I had already change the GPU for them (DC1649) and then found no PWM.... Yes, I made the mistake of not testing it first and went on customer request! I have charged them for GPU but not for the backlight repair. Tied to 3V3_S0 via resistor.

820-2915 For now I have tied it to 3V3_S0 and backlight is working. Really don't want to fuck the MUX, shuold I bother tryng to reflow it?

Try another screen / cable. GPU issues are not common (I've never heard of or seen it).

Liquid, very bad but mainly around SSD J3700 which needed to be replaced. EDIT. Trackpad is working. Keyboard not working KeyBoard not working. Same KB and T-Pad / cable are working with a good board I have tested KB connector pin voltages against a working board with T-Pad plugged and...

3v3_SUS = 3V3

No liquid. Seemingly arbitrary failure. PBUS = 8.59 3V42 = 3V42 S5 = 3V3, 5V PM_SLP_S4_L = 1V No shorts on anything connected to PM_SLP_S4 L Flushed out under SMC. Help please. Thanks.

Hi. If Louis or anyone else would like to share where they got the correct size BGA nozzle for the CPUs on the touch bar Retinas please? Many Thanks.

Previous work. Liquid damaged. PPBUS = 8.6 3V42 = 3V42 S5 rails = 3v3 5v All S4 S3 S0 rails (3v3, 5v, 1v05, 1v5, 1v2, 1v8, 0v6) cycling. Can't find a short. I'm guessing maybe Isense somewhere is bad? I'm stuck on this one. Sorry there is not much to go on

Are you sure you have not replaced the trackpad with another shit one?... This kind of bullshit hapens to me al the time. Have you inspected the T-PAD connector properly? You may not see the link but, sometimes a bad battery can cause this. Sometimes bad charger. Is you fan ramping up? Have you...

Hi. Just wondering if anyone has explored the possibilities of cured underfill removal, using organic solvents? I read a post suggesting Dynasolve 225 https://www.dynaloy.com/products/dynasolve-225 I mght give this a shot. Other suggestions are to heat the chip / PCB area to well above...

Any image on external monitor?

Send them back with a note requesting they send it back to you for the parts bin. Fix it for yourself, job done.

Have you seen the 3787 board suffer KPs as well as black screens? Got the first 10. They look good, same date codes, no tell-tale marks.

For board repair I find it's just not needed. OK so some parts of some boards need a little more soak time but since I have a source of hot air in my hand, and I'm able to actualy move my arms, I just use the reowrk station, along with my elbow for distance. Spending money on what you can do for...

No extra cost for a board that has been tampered with but I often refuse them completely. Sometimes warranty and sometimes no warranty. Depends on how bad the tampering and if it's trade or end user. The general rule is, if I'm not happy to risk a warranty / bad review / unhappy customer, then I...

I own an FX888D with a T-18 and a 951 with a T-30 and I use the T-18 for everything. Equipment be fucked, it's about just a little skill. The fact is, if you have more respect for another persons board, then you make more money by not fucking it up.