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12V21 is present on the L9100. The continuity of the 12V through the lcd connector is OK. Is there a way to test if the LCD is OK?

I ve placed the old LCD, but no sceen is coming. Is it mandatory to use that LCD sensor to get image on the sceen? I ve connected the imac to an external screen but also no beeld is showing up. Can you tell me what are the important signals that need to be on the LCD connector to get image...

No Title Yes, indeed i ve found a connector on the LCD PCB that has no cable connected to it. I am not sure if this what you mean with temperature sensing. Here bellow a photo of it. I could found a substitute cable that fit this connector, but where I couldn't find on the board where it should...

Pin 1 and 2 of the lcd connector were burned because of the short also the cable connecting the board to the lcd panel. Like i ve said i resolderd a new connector and changed the cable with a new one. the screen i m using is a new one. i m testing it without plugging a hdd. what kind of temp...

Hello; My next job after more than a month. I got an Imac A1418 from another shop. When plugging to power it gives the chime but no picture on the screen. After 50 seconds the fun begins to spin. The other shop has already bought a new screen. I ve changed the LVDS connector on the...

How can I confirm that the MCP79U is faulty by measuring?

I want to come back on this case; Like Louis said 3 days ago on his live streem that CPU's can be replaced if we don t get often macs to repair a day. If not I can replace it. In my case I get just 1 a 3 macs a month for repair. Also the customer blaims me that I m responsable for damaging...

I need to know more about what the problem is concerning the MCP79U. Is the chip totally dead or a reball can repair the problem? If the Chip totally dead can changing the chip help the problem? Boards for such macbook are still costy and the customer cannot afford spending 300,-$ for a...

Hello; I got a macbook air today with the next problem. when powering it it beeps continiously, and no chime is coming and no picture is showing where should I start measuring? thanks.

Okai. But how can you confirm that the LCD is dead by measuring signals on the LCD connector?

I m in The Netherlands. And indeed I ve borrowed an LCD from a working mac. And indeed image showed up. thanks. But there should be a way; a signal coming at the LVDS connector or from the LCD to the SMC for example that can confirm this problem, I presume. Now the we know that the problem is...

Right. just tested and voltage was not there. Is another working display manatory or is there another methode?

Yes indeed. i was measuring with lcd plugged in. if measuring without LCd voltage must be there? will test after 2 hours from now

Already done. seems to be normal. in diode mode test gives 0V3 forward. and in sper it gives zero.

I ve just tested the pin1 of the LVDS connector. it got no PPVOUT_S0_LCDBKLT. then D7710: Anode has 12V7 but cathode zero. feedback is missing. what can it be? maybe short R7732? will test in a minute. No voltage devider is ok. Q7701 gate is low 1V7. need to be more then 7V. pin1/2/3 are zero...

SMC_LID is 3V44. and I don't see any corrosion arround the U7700

After a look to the board I saw no liquid corosion traces. What do you mean with SMC_LED high? which IC is the backlight chip?

Hello; my next macbook gives chime when pressing power button. then after 4 or 5 seconds a flits light comes on the screen then become black. i still see a little bit light on screen. And that is it. what are the first steps to be done on this situation?

You said "the high side" what do you mean by that? By measuring the coil L7630 I found it short also on pin2 side. After lifting the CPU the short is gone from the board. i ve found thouse CPU on aliexpress for sale. 125$ new price. what is your experience on those chips from aliexpress...

Ok. before closing this thread. can you tell me how i can confirm for sure that this CPU is dead?