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https://boards.rossmanngroup.com/threads/tons-of-untouched-clean-boards-for-sale.55554/

We replaced R7601 and now have 5v at pin 13 PP1V05_S0 has 300mv. ppvin_s5_hs_computing_isns 12V P1VO5S0_DRVH - 300mv ..................... DRVL 0v. .......................... LL 300mv ..................... . VBST 5v P1v05S0_Boot_RC drops to 300mv after C7630 P1V05s0_EN 5v Replaced C7630...

U7600 - input voltages missing PP5V_S0 - 5v PP5V_S0_P1V05S0_VCC 0v Am I correct in my reading of the schematic that the supply for "PP5V_S0_P1V05S0_VCC" is PPv5_s0 ?

Sorry .. I realize now that there must be power coming from u7200 CPUVR-Pgood so the issue lies elsewhere I think?! CPUVR_VDD 5v CPUVR_VIN 12.75v PP3v3_S0 - 3.5v PP1v05_S0 -.422v PP1v5_S0 - 1.508v PPVTT_SO_DDR 0v

Hi Computer turns on, no chime, keyboard light or video. Tested CPU power coils 0v. ALl SYS PWRGD 3.5v PP3V3 S0 us 3.5v however I get no voltage at 2 of R1950 - should I replace this resistor? (CPUVR PGOOD) Cheers James

Hi All, Does anybody have schematic for the above computer? Also can anybody recommend an alternative wire for running leads ? I can't find anything locally (Australia) and many Amazon sellers don't ship to Australia. https://store.rossmanngroup.com/jumper-wire-thick.html

What fun says Louis! I've read the sticky on the home page. I WAS getting 8.5 v out at baclight but now 0. BKLT_EN_DIV 8.07v S0_LCDBKL 8.34v No power on Pin 1,2,5,6 for Q7906 BK_EN 5v

Hello Louis, I saw your video on this topic yesterday! For it to be valuable to us long term the association / accreditation process would have to do at least one of two things... 1. Give us skills to do work we currently are not able to do 2. Deliver us customers we currently do not get...

BKLT_EN_R sometimes seems to drop to 0v with corresponding drop on backlight circuit from 45v to 12v I'll test with another screen, sorry. I don't have them lying around yet like you guys do for testing!

BKLT_EN_R retested 3.5v. L8410 is still 12.45

LID_OPEN 3.5v SMC_LID LEFT 3.5v SMC LID Righ 160mv HALL_SENSOR_RIGHT 160mv (audio flex not connected so I assume this is the reason for low value?) BKLT_EN R 2mv

LCD BCK_FET DRV 0v

Q8400 output 12.45v Q8401 Output 12.45v

PPv_OUt_S0 Backlight 12.3v

UPDATE No Backlight

Hello Client has brought in laptop with their son saying there is no screen. I get the laptop in the bench and open lid... perfect video. This morning nothing on display for about five minutes, I go away for a bit to find a torch to see if it's just no back-light and the laptop is on again and...

nozel did the trick off in 2 mins.. LOL - Thanks! I'll reball and let you know how I went.

Could this be a motherboard / screen compatibility issue? Client has also informed me that the webcam also does not work.

LCD_BKLT_EN is present? - 1.6mv. 1.5mv on R7742 BKLT EN R I assume you mean the resistor connected to Pin 17 of U7701.

Pin 1 - 2mv BKLT_EN_R - 1.9mv BKLT_SD 5.03v I took a look at the schematic and working my way back on the backlight circuit I've checked ... U8300 Pin 1 PPV5S4 5.04v PPV5 FETCAP LCD 5v PPV5 SW LCD ISNS 5v Q7701 (Si7812DN N Channel Mosfet) BKL_SW 54mv BKL_FET_CRTL_R 0v ... which I think may be...