(347) 552-2258 help@rossmanngroup.com

820-00923 20v 0.45 amps to 0.7 amps no video

Outofwhack

Outofwhack

Member
No corrosion evident on board.

pp3v3_g3h 3.4v
ppbus_g3h 13.07v
pp5v5_s5 5.12v
pp3v3_s5 3.35v
pm_slp_s4_l 3.3v
smc_reset_l 3.4
all_sys_pwrgd 3.2v
pp5v_s0_fan_conn 5.1v
pp5v_s0_vcore1 5.1v
pp5v_s0_vcore2 5.1v
pm_slp_s5_l 3.3v
rtc_reset_l 3.1v
pch_srtcrst_l 3.1
pch_intruder 0v
pm_slp_sus_l 3.3v
pp1v8_s0 1.8v
pp1v8_s0_pch_vcchda_f 1.8v
pp1v2_s0sw 1.2v
pch_hsio_pwr_en 3.3v


snow edition USB shows steady light till just after being delivered 20v
Still get current draw mostly 0.45amps with occasional second at 0.7amps

No video.

Wondering where to go from here.
 
2informaticos

2informaticos

Administrator
Staff member
"pch_intruder 0v"
I suppose to be PCH_INTRUDER_L and must be high.
Check R1401 pin 1 voltage.
If present, check diode mode to ground at pin 2.
 
Outofwhack

Outofwhack

Member
I must have made a mistake in measuring originally as R1401 pin 1 is 3.0v, pin2 is 2.8v
Diode mode to ground at pin 2 is 0.75v
 
Outofwhack

Outofwhack

Member
Client said simply stopped working.
I haven't collected a BIOS for an 820-00923 A1706 as yet and can't find one on this forum. Is there anywhere else I can go?
 
Last edited:
Outofwhack

Outofwhack

Member
Ive tried the BIOS above but still no usb activity, video or spinning of the fans via the keyboard ribbon cable in the case.
Could it be lack of a clock signal or is that ruled out somehow? I have an oscilloscope
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
Can you check CPU core voltage on other similar A1706 board?

Do you get all voltages from page 78 on your board?
BTW, test the board alone on the desk; nothing more than charger connected.
 
Outofwhack

Outofwhack

Member
I have no other A1706 board.
I will check page 78.
Yes Ive had the board alone on desk the whole time - just occasionally trying back in the case for benefit of fans but I suppose thats a bit optimistic!
 
Outofwhack

Outofwhack

Member
PP3V3_SUS 3.3v
PP3V3_S4 3.3v
P3V3_S0 3.3v
PP5V_S0 5.1v
PP3V3_S4SW_SNS 0.1v
PP1V8_S4 1.8v
PP1V8_S3 1.8v
PP1V8_S0 1.8v
PP1V2_S3 1.2v
PP1V0_SUSFUSE 0.99
PP1V0_SUSSW 0v and next time I look 5v
PP1V0_S3 1v
PP1V0_S0SW 0v
PP5V_S4 0v and next time I look 5v

PP1V0_SUS 0v and next time I look 1v

PP5V_PMICLDO 5v
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
U8280 not mounted, normal missing PP1V0_SUSSW.

If U8286 is mounted, then PP1V0_S0SW muste be there; check in diode mode to ground.
Post U8286 voltages.
 
Outofwhack

Outofwhack

Member
U8280 is not mounted.
U8286 is there, PP1V0_S0SW 1v with board powered ( but pretty sure read 0v before)

Diode mode
pin1 0.3
pin2 0.47
pin3 0.15
pin4 0.15
pin5 0.1v
pin6 0.1v
pin7 0.5v
pin8 0v
 
2informaticos

2informaticos

Administrator
Staff member
No need to check U8286 anymore, if you get 1V0_S0SW.

Just in case, check pins 19/20 voltage, of U3500 and UB700.
 
Outofwhack

Outofwhack

Member
What? Take up to 100centigrade? or reflow temperature?
For the cpu should I heat the heatsink itself to keep it even?
 
You must log in or register to reply here.
Top