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Hello. Im working on a 820-00164 board it will not power on. I have green light in magsafe. When measuring PP5V_S4RS3 it is unstabel and gose from 0V - 3V - 0V - 3V Same with PVCC_S0_CPU its go from 0 too around 1,5V then drop again

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working on a old 820-2533 with no pictures, no backlight and no chime. I don't know history off board but found some a little area with water damage (around u6990 replace u6990 and the capacitor straight with and cleaned area) Still no pictures no chime no backlight. When I remove the ram it...

*solved* Pin 10 missing contact

Hello. I'm sitting with a 820-3536 board with keyboard issue. 9 O L . and @ dosent respond. I have replace new keyboard connector and tried know good working keyboard with same result. Question dos anybody know witch pin on j4813 or U4801 that create signal for those.

Nice. Unfortunately, the shipping price to Norway is very expensive.

Thank you for reply Duke. Want to look for more corroded resistor / track later. If not, the next step will be smc reflo

I have a liquid damaged 820-3462 board here, it's liquid damage around smc I have cleaned up all nasty resistor and capacitors. The board is not always powering it's like depending on witch day it is.. Could it be bad smc?

Have a 820-00875 board with out pictures on screen. any idea where to start? i have backlight. smc reset dosent fixit. no sign for water damage. i dont know any history except that the customer mean that screen working on extern screen.

ok. then i give up this card. *close*

tried with external keyboard still no pictures and chime. Also tried mouse in a 820-3115 board without RAM and it light up.

Have tried pram reset with a know good keyboard. Still no chime or pictures.

So I can try reflow smc? (Have tried smc bypass with no luck) U1900 give voltage on all pins U1950 looking fine (don't know how to measure that) Yes light in USB mouse. CPU getting little hot.

Maybe ther could been some liquid around. Also found a broken C8351. But that has noting to do with no posting..

on u1900 pin 8 what voltage should i have there ?

Y1950 i get 0.940V on pin 1 and 4 J6100 i already have removed Will measuring u1900.

now pp3v3_s4 and pp3v3_s3 is 3,3V still no chime and no screen. Could it be bad EFI?

have a 820-3437 Logic board with short on ppvrtc_g3h. I removed u1900 still short. Try to inject voltage (3V) but it only draw0.190A so around 0.58W. Any tips to next step? Ppvrtc only give 1,3ohm. it is liquid damage. Good cleaned before I got it..

I hope.. just order new one.

No Title Pp3v3_s4 and Pp3v3_s3 is low.. only 2,84v on pictures u8000