MeTech Turkey
Member
charger ordered. The older owner was using 100 watt charger but will resolder all of them together and in 2 3 days charger will arrive and re try with the charger and let you know the result
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820-00281-A Only 5v and 0.26amp not turning on
- Thread starter MeTech Turkey
- Start date
Any charger, even 61W can help you to check power rails.
Board will not start, but main power rails must be present.
Board will not start, but main power rails must be present.
MeTech Turkey
Member
Unfortunately I have only 47watt charger of a lenovo. Charger will come tomorrow or after tomorrow so better to wait 2 more days and then will let you know
MeTech Turkey
Member
I have my 87watt charger now and was away for a while with the new and correct measurements these are the last situations. And all the components re soldered back.
F7000/1 diode mode is 0.445 and voltage is same around 0.003V
L6900 diode mode is both legs 0.355
F7000/1 diode mode is 0.445 and voltage is same around 0.003V
L6900 diode mode is both legs 0.355
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Post U7000 basic voltages.
MeTech Turkey
Member
HPWR_EN* - 0.0V
MPM_PBUS - 1.06V
P_IN - 5.18V
AUX_DET - 1.28V
SMC_RST_IN - 0 .020V
VDDA - 5V
VDDP - 5V
EN_VR1 - 1.99V
SMC_RST - 0.0V
AUX_OK - 0.0V
AMON - 0.006V
BMON - 0.002V
MPM_PBUS - 1.06V
P_IN - 5.18V
AUX_DET - 1.28V
SMC_RST_IN - 0 .020V
VDDA - 5V
VDDP - 5V
EN_VR1 - 1.99V
SMC_RST - 0.0V
AUX_OK - 0.0V
AMON - 0.006V
BMON - 0.002V
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Check diode mode over C6905.
Also check if R6920 is not burnt.
Also check if R6920 is not burnt.
MeTech Turkey
Member
I dont understand why but when I tried to measure C6905 on diode mode it goes directly ( I have Sunshine DT-17N multimeter which is auotmatic) to read 85.9 ohm like it is a resistor but right before it gives me a short beep. Do I make a mistake at somewhere? when I measure the R6920 (when it is on board and soldered) I read the same value. Please show me a way without getting angry 
if I am doing wrong. Is it better to remove R6920 and check diode mode on C6905 one more time? I have only a 820-01237-A logic board with me that I can get some spare parts from. But I couldnt find the boardview and schematics for it.
if I am doing wrong. Is it better to remove R6920 and check diode mode on C6905 one more time? I have only a 820-01237-A logic board with me that I can get some spare parts from. But I couldnt find the boardview and schematics for it.
I really expect to get low diode mode reading over C6905; which is not good, of course.
In such case (leaky capacitors), R6920 is probably burnt, or out of specs; it should give you 0.000-0.002 (when good) in diode mode (between its pins).
Remove C6905/6 (one by one) and check again diode mode between C6905 pads.
If still low, U6903 is bad.
In such case (leaky capacitors), R6920 is probably burnt, or out of specs; it should give you 0.000-0.002 (when good) in diode mode (between its pins).
Remove C6905/6 (one by one) and check again diode mode between C6905 pads.
If still low, U6903 is bad.
MeTech Turkey
Member
I have removed C6905 first, and the result was same but when I removed C6906 and measured from C6905 on diode mode result is 0.575 and when I measured R6920 (soldered on logic board) it gives continues beep on resistor mode, and value is 0.3 ohm
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Throw away C6906.
Now check C6905 voltage; if good replace, C6906.
If still missing, D6902 should be bad.
Now check C6905 voltage; if good replace, C6906.
If still missing, D6902 should be bad.
MeTech Turkey
Member
C6905 has 4.015V and the voltmeter which is located on the charging port show 5V and 0.002A but do you have a boardview and schematics for 820-01237-A imac logic board to get a new capacitor to replace C6906
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