Macbook Pro A2442 820-02098 No image but has backlight

[mon2]

Interesting thread. Would you not have a whatsapp contact at Seven Puppy? If not, can share one.

[mon2]

Got censored on the post again. I would love to personally low level wipe the server software and with multpile over writes.

[SMDFlea]

Sorry about that.

[a316]

Got censored on the post again. I would love to personally low level wipe the server software and with multpile over writes.

not understand sarcasm?

[a316]

found seller's flex has spi_tcon_clk_conn shorted to ground, on JP600 side. apple's flex has 4,5Om same pin to ground, flex disconnected

my fault about apple's flex - spi_tcon_clk_conn has infinite resistance to ground

but on seller-s flex -it is clearly shorted to ground. it is 4-th pin from left. =pin 28 and pin 30 both beeps on seller's flex, pin30 only beeps on apple's flex

flex is DISCONNECTED when measuring

[a316]

my fault about apple's flex - spi_tcon_clk_conn has infinite resistance to ground

but on seller-s flex -it is clearly shorted to ground. it is 4-th pin from left. =pin 28 and pin 30 both beeps on seller's flex, pin30 only beeps on apple's flex

flex is DISCONNECTED when measuring

see picture 1 - this pin (marked black line) is shorted to ground on seller's flex
picture 2 - this pin on seller's flex (red color) has 1.5 Om resistance to ground

[MartZisto]

found seller's flex has spi_tcon_clk_conn shorted to ground, on JP600 side. apple's flex has 4,5Om same pin to ground, flex disconnected

it is like not flex, it likes has some parts inside

let me know if this helps

ps. spi_tcon_clk_conn connected to M1, be careful

a316 alright interesting, wonder what I could do. Just got info that switching ic:s was not advised from them. Weird though. You didn't say though before, what part gets hot?

[a316]

a316 alright interesting, wonder what I could do. Just got info that switching ic:s was not advised from them. Weird though. You didn't say though before, what part gets hot?

glass, up to 100 celsius, see photo I attached with screwdriver points there

[MartZisto]

glass, up to 100 celsius, see photo I attached with screwdriver points there

a316 trying to talk to them about sending me a flex so I can try reseating the original ic:s and see if that works. Truly terrible that they are not included from the get go

[a316]

a316 trying to talk to them about sending me a flex so I can try reseating the original ic:s and see if that works. Truly terrible that they are not included from the get go

any result?

[a316]

here is analysis of SUBJ issue: (need testing, pls contribute)

1. M1 can turn off image creation if spi_tcon_clk_conn is not ground (this is why seller's flex shorted)

2. such way if screen lcd has some (!!temporary) failure (mainly lcd <->tcon connection problems/ short) then M1 senses it and stops sending imagd to LCD even backlight exists

3. on earlier T2 after glitch LCD was recoveryng automatically (continue to show image), on M1 - no more, :-(

so solution is to make some button which shorts spi_tcon_clk_conn to ground and try to play with it. because after reboot M1 restores image creation (until spi_tcon_clk_conn is good), but reboot is not solution

any ideas?

[a316]

other solution may be power off/on TCON board to restore image

[MartZisto]

a316 seller let me return those ones, as I never received the flex. I got my money back from ali anyway. Now the seller will send two new units to me, as well as I found an original screen super cheap that I will test with also. No more news than that for me at the moment. But good research progress. Makes sense they would bypass any protection circuits.

[MartZisto]

a316 I just recieved new displays, both work with included flex. Somehow they even retained true tone?!?! Without swapping IC:s??? I am extremely confused

[a316]

a316 I just recieved new displays, both work with included flex. Somehow they even retained true tone?!?! Without swapping IC:s??? I am extremely confused

true tone comes from original camera, not lcd

this is why lcd replace is good

[mon2]

True tone is linked to the ALS (ambient light sensor) which is separate from the camera. There is a local level shifter involved in this communication path onboard. Do review this level shifter if the ALS is a suspect.

[a316]

True tone is linked to the ALS (ambient light sensor) which is separate from the camera. There is a local level shifter involved in this communication path onboard. Do review this level shifter if the ALS is a suspect.

yes, it is linked to original display (ALS in chasis) and you have to replace ALS and dissasemble whole original display to have true tone

[MartZisto]

yes, it is linked to original display (ALS in chasis) and you have to replace ALS and dissasemble whole original display to have true tone

a316
I only replaced the lcd's, and all works as it should. Havent had that work before I think. I am happy.

[a316]

a316
I only replaced the lcd's, and all works as it should. Havent had that work before I think. I am happy.

if it not worked before, maybe assembly is not paired to current MoBo (it is paired to its old original MoBo)

[Jilanov]

a316 I just recieved new displays, both work with included flex. Somehow they even retained true tone?!?! Without swapping IC:s??? I am extremely confused

Hey,
Could you send me link to seller store or Whatsapp/Wechat. I have ordered over 20 LCDs from China for A2442 and until now only 3 worked with IC chip swap

[moophus]

I have the same issue. at some point the screen started working again for a whole week with no issues. It was working so well I brought it on a 2 week trip. halfway through the trip the screen went out again. but I noticed that when I open the lid, the lcd turns on for a split second before turning off again (all the while, the backlight stays on and is adjustable) so then I noticed that if I keep opening and closing the lid, at some point, the lcd stays on! so I used it for the rest of the trip like this. playing with the lid until the lcd remains on. actually once it stays on, it will stay on indefinitely until I close the lid. very odd. Only after the trip did it start going dark again. Now I haven't been able to get the lcd to stay on any more. VERY odd symptoms.