[SOLVED]820-4924 No S4

[Tony Tone]

No pp5v_s4.
Missing:
-pm_pch_sys_pwrok
-pm_pch_pwrok & apwrok
-plt_reset_l

-pm_sysrst_l .018
-pm_batlow_l .035
-pch_pm_slp_s0_l .014

U1950 have pp3v42_g3h
cpuvr_pgood_r .015

Have I been paying good attention with where I am going?

 

[dukefawks]

Need basics first, PPBUS, 3V3 on L7560. Is there a short pulse on L7520 after connecting power? Where was liquid damage?

 

[Tony Tone]

L7560 3.3v. No pulse and nothing on L7520, liquid yes.

 

[Tony Tone]

Good morning : ) you guys are up early over there!

 

[Tony Tone]

No Title

It is prehistoric but it (L7520) stays flat 0 when I first plug it in and stays that way.

 

[Tony Tone]

..................................

 

[Tony Tone]

Little bit of liquid was near clock, U1845 (changed), C1020 (short to ground or low resistance to ground? .007). Everything else is pretty clean.

 

[dukefawks]

If there was liquid on clock chip change it U1900. Or if you want to measure check 32kHz on pin 12 and 3V on pin 13.

 

[Tony Tone]

U1900 is good if I have 3.4 on pin 13 & pin 12 has a signal? I have both.

 

[dukefawks]

Did you check 32kHz with the scope?

 

[Tony Tone]

Yes. I have an old school one though. It only shows that there is a signal, but it doesn't show the kHz.

 

[Tony Tone]

With Fluke 15B+ says 0.407v

 

[dukefawks]

No idea what I'm seeing there. Any scope is capable of displaying 32kHz, go and learn how.

 

[Tony Tone]

No Title

Guess I'll get a Rigol. This don't tell me anything.

 

[dukefawks]

Why? Any scope will do for this. Most scoped have a 1kHz reference output, see if you can get that on the screen.

 

[Tony Tone]

I'm not too sure on how to calculate this correctly. But I got 3.25 divisions per cycle at 5ms.
I don't see a 1kHz reference output.

 

[dukefawks]

No need to calculate anything, are you seeing a sort of square wave form?

 

[Tony Tone]

No. I am seeing a sine wave, not square wave.

 

[Tony Tone]

Ok, sorry about that. I have been seeing a sine wave, now I am seeing a square wave.

 

[dukefawks]

Voltages on R1300-3. What is resistance to GND on C1020 in Ohm?