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Dimmed green light on 820-2915

Yustina

Yustina

New member
the smc was changed..... when I follow the path for pp3v42, one of the components arrives to the resistor I mentioned and its supposed to measure 3.42V, It doesnt matter that it doesnt measure that? every component on the 3.42V trail measures BUT that resistor and since I still dont have a strong green light on the charger and I have NO experience, well, I do NOT know
 
Gurmon

Gurmon

Member
R8798 doesn't have anything to do with pp3v42_g3h, as duke already mentioned.

Just want to make clear, do you have 3.42V on L6995 ?
 
Yustina

Yustina

New member
Gurmon said:
R8798 doesn't have anything to do with pp3v42_g3h, as duke already mentioned.

Just want to make clear, do you have 3.42V on L6995 ?
Click to expand...

thx for pitching in, yes, I have 3.42 on L6995.... so just to understand, if that resistor (R8798) does not measure what per boardview is supposed to measure, it doesnt matter?
 
Gurmon

Gurmon

Member
ok lets clear up this R8798 issue. If we are talking about 820-2915 board, this is a inline 0ohm resister on SMC_GFX_OVERTEMP_L line. Forget about this for now.

Lets go back to why you have a dimmed green light. Have you measured every component on page 62 of the schematic ?

Have you tried all the easy things like known good DC-in board ?
 
Yustina

Yustina

New member
Gurmon said:
ok lets clear up this R8798 issue. If we are talking about 820-2915 board, this is a inline 0ohm resister on SMC_GFX_OVERTEMP_L line. Forget about this for now.

Lets go back to why you have a dimmed green light. Have you measured every component on page 62 of the schematic ?

Have you tried all the easy things like known good DC-in board ?
Click to expand...

Yes, board 820-2915, ill forget about that resistor for now then. I can say that I have tried the basiscs like good dc in board, I have also troubleshot page 62 (not the battery part yet) and the only thing I dont have is SMC BC ACOK
 
Gurmon

Gurmon

Member
okay thats good we are getting somewhere now.

Lets see why we have no SMC_BC_ACOK ? turn to page 63

Lets check a few of the common inputs. please provide voltage readings for U7000

1) SMC_RESET_L pin 13 ?
2) CHGR_ACIN pin 3 ?
3) CHGR_DCIN pin 2
 
Yustina

Yustina

New member
Gurmon said:
okay thats good we are getting somewhere now.

Lets see why we have no SMC_BC_ACOK ? turn to page 63

Lets check a few of the common inputs. please provide voltage readings for U7000

1) SMC_RESET_L pin 13 ?
2) CHGR_ACIN pin 3 ?
3) CHGR_DCIN pin 2
Click to expand...
Thank you so much for taking this time with me, as soon as I get back home I'll take these measurements again and post
 
Yustina

Yustina

New member
Gurmon said:
okay thats good we are getting somewhere now.

Lets see why we have no SMC_BC_ACOK ? turn to page 63

Lets check a few of the common inputs. please provide voltage readings for U7000

1) SMC_RESET_L pin 13 ?
2) CHGR_ACIN pin 3 ?
3) CHGR_DCIN pin 2
Click to expand...

PIN 2 OF U7000 reads 1.8V
PIN 3 reads 3.96V
pin 13 is SMC_RESET_L (CHGR_RESET_L) measures 3.5V
 
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Gurmon

Gurmon

Member
okay some weird stuff going on. Not making sense.

Whats voltage pin 1 and 3 of D7005 ?
 
Last edited:
Gurmon

Gurmon

Member
that makes more sense, replace resistor with 20ohm,
you can take R7005 out of circuit and measure, if its above 20ohms bin it and replace.
 
Yustina

Yustina

New member
ok, replaced and resistor was measuring 20.5 ohms, plugged in and still no bright green light, only dimmed, started measuring pins 2, 3 and 13 of U7000 again and measures came up as per boardview, after a moment, measured resistor and it fluctuates between OL and 0 ohms now and measurements back to whack on the same pins of u7000, did I mention there is a buzzing sound coming off of the board once plugged in.....
 
Yustina

Yustina

New member
ok, left board to cool off completely and my resistor now measures 228 ohms, what could have messed it up? I am aware of the lots of components on the line but, which one would have the ability to mess up the resistor like that.... it was fine for about one minute after board being plugged in and measured, then it went to shit
 
Gurmon

Gurmon

Member
The resistor is blowing because too much current is being drawn into u7000. The chip could have a internal short to ground.

Replace r7005 with u7000. But before you do this, does this machine work from a battery ?

whats diode mode reading on l7030 ?
 
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