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Yes I´ve checked that, right now I get no image at all nor internal or external... only 3 of the 2 leds ON, is that a problem with the comunication between LCD or GPU to the mother board? Please help me figure this out... I have 3 imacs experiencing the same fault... When it turned on, we used...

Hi the board turns on fine, it chimes and loads system, so far I´ve tried another powersupply another inverter card and another lcd with the same result, when I turn it on it chimes but I have no image on the screen... When I tried a known good video card it showed image and booted to the login...

Hi, this is the first iMac that I get to repair so I don´t really know where to start. It powers on but sometimes it shows image on the screen, replaced the EG card with a working known one and it didn´t show image, the I have 2 leds on on the board, the last 2 doesn´t turn on. Where should I...

CHANGED R7267/68 and now it is working apparently fine... thank you!!

Still the same, I replaced Q7260/61 and R/C7260 still getting 2v at PP5V_S3 is it worth removing U7200 and injecting voltage on PP5V_s3 line?

Replaced U7200 PIN 1 = 1.22v replaced Q7221, still getting 2v at PP5V_S3

L7260 = .247 "P5VS3_EN_L" Ends with "_L" for some reason; 0V is correct value. ----> So on the entrip1 and entrip2 of U7200 I will get 0V correct? PIN 1 U7200 = 0V Replaced R/C7260, still not getting further...

Just did that, still not getting PP5V_S3 ... but now it is 0v instead of 2.0v which is maybe a good sign? P5VS3_EN_L = 0v (pulses 3.3V when I turn on the PSU, then drops, when I turn off the PSU it goes high again and drops...)

No I didn´t...

Im having trouble with this board on pp5v_s3, when I inject voltage U7200 gets hot, I already replaced U7200 with no change. PPBUS_G3H = 12.60 PP3V42 = 3.42V PP3V3_S5 = 3.3V PP5V_S5 = 4.9V PP3V3_S3 = 3.3V PP3V3_S0 = 3.29V PP5V_S3 = 2.0V pp5v_s0 = 0v P5VS3_EN_L = 0v (pulses 3.3V when I turn on...

I don´t see why to change the connector, when I start the computer pressing ALT (Option) key, mouse and keyboard work fine, even the CAPS green light works, as soon as I leave the boot menu and the system starts loading I loose them both... worth reflowing the PCH ?

I replaced R4860 and Q4860 still the same... I checked all TPAD_SPI lines and all seems to be good, the resistors have their values... no open or broken resistor...

The trackpad and keyboard work fine, I used a different board to see if it worked, and it did just fine...

All ohm values on R4850-53 are OK SMC_LID = 3.42 steady

R4850-53 ARE OK U4810 1 = 3.3 2 = 0 3 = 3.3 4 = 0 5 = 3.3 6 = 3.3 7 = 0 8 = 3.3

Hi, this board is turning on, but when I get to the login screen, trackpad and mouse, just don´t work... But if I press ALT when the computer is starting, they both work, so it is not the keyboard nor the trackpad. PP5V_S4_IPD = 5.1 PP3V3_S4_IPD = 3.3 SMC_LSOC_RST_L = 3.4 SMC_ONOFF_L = 3.4...

I found that U7499 was the problem and replaced it and now it is working fine...

Hi, I have this board entering S0 state, have all the voltages present to create all_sys_pwrgd but it is not present. Already changed Q8150 just in case but no difference. When I remove U1950 all_sys_pwrgd is 0v, but when U1950 is in place I only get .062V can that be caused by PCH? Should I...

Pregunta: si inyecto voltaje en P3V3S3_EN puedo dañar algo? quitando Q8150 ALL_SYS_PWRGD me daba un voltaje de 1.8V, por lo que inyecte voltaje en las lineas PP5V_S0, tuve que reemplazar U8080 porque se estaba calentando, despues inyecté en PP3V3_S0 y no encontré corto, por último en PP3V3_S3 y...

Just reballed the ram chips, no change. The 3 beeps have space of around 3 seconds between each. According to me that means BIOS, but the I have tried 3 different bios from vinafix and it is not working... any advice?