820-2330 no display

Dozer

Member
hello friends, i am just working on that board. MCP still original with edgebonding, seems not touched.

got it yesterday. problem turning on, led is constant on, fan is spinning, no display.

i checked the power rails

seems to be all there

the PP5v_s0 is 5.11V , is that ok ?

the only one what i missed is PPVTT_S0_DDR_LDO

DDRVTT_EN is 0V as well

need some help here.
 

Dozer

Member
found now in the corner left from the cpu under the cpu coil some korosion. this should be the problem. I will try to solv it and report back.
 

Dozer

Member
i replaced now all the resistors and caps ich were looking bad
still i had to solder 2 wires
one from R7123 Pin2 (CPU_VCCSENSE_N) to R1101 Pin1
second from R7122 Pin 1 (IMVP6_VSEN_P) to C7131 Pin1

now I have CPU Vcore 1,0V

but still no display
 

Dozer

Member
I heated up 100C the GPU and voila display is coming. So after replace GPU should working that machine. :)
thanks duke for help.
 

Dozer

Member
I checked already U5570,5500,5550 and the area around and the q5503,5501

everything looks good and i measured in diode mode and compared with a donar board , same values

PP3V3_S0 is present

the i2c lines are 3.3v and have some data
 
Top