Re: GRANGER-6050A2977601-MB-A01 Schematic
Thanks!! It helped me....
lgcyber
Member
Last Activity: 11-27-2024, 02:50 AM
Joined: 02-25-2013
Location: Tayabas City, quezon
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Re: No power ACER C5V01 LA-E891P
Have you solved this when you bought the IC? Any updates?...Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
I forgot to update you folks on this repair. I already fixed this by replacing PU301. Thanks for all the help especially to Mon2.Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
I am already using a wire to short the ON/OFFBTN# to ground in order to turn on the unit. You are right it's already morning here. I think I really have to sleep now to clear my mind.
Thanks for your time. I appreciate it very much....
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
ON/OFFBTN# = 3.32v when power button is NOT pressed
ON/OFFBTN# = goes to 0v when power button is pressed
+RTCVCC voltage with respect to ground = 3.22v...Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
Resistance to ground of 5V_3V_EN = 912Kohms
Upon removing the 2.2Kohm resistor PR504, EC_ON is 0v but will go up to 1.4v when you press the power button then will go back to 0v immediately.
5V_3V_EN will stay at 0v even when you press the power button.
I noticed also that now MAINPWON is 0v but I remember that this has 3.3v when the board is powered. Should I solder PR504 back and see what happens?...Last edited by lgcyber; 11-20-2022, 02:45 PM.Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
Very stable at 3.32V when the board is powered however when I press the power button it goes down to 0v. Hmmm. I think this should remain at 3.3v right?...Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
I confirm that there is 3.32v present at Coil L4. Sorry if I missed that coil....Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
EC_SMB_CK1 = 3.3v
EC_SMB_DA1 = 3.3v...Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
Pardon me but I'm not sure what L2 and L4 is on PU301. Do you mean pin 16 and 17 is the L2 or the 3V LDO voltage and L4 is the PWM voltage produced at LX pins (pin 6, 19 amd 20)? If it is, then the resistance from L2 to VCC_IO2 (pin 124) is 0.03 ohms and the voltage to ground of L2 is 3.32v when the board is powered. Likewise, all +3VLP_EC pins(22,33,96,111,and 124) on U6 have 3.3v.
The voltage at L4 is 0v which is understandable because there is no 3.3v signal at pin 12 of PU301 which...Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
+3VLP (pin 16 and 17) = 3.32v
EN2 (pin 11) = 4.39v...Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
Sadly. 3V_EN did not become stable even after opening PJ301 and then PJ501....Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
Hmmm nice idea. I'll open PJ301 first and I'll post the result. Thanks very much for the help....Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
Thanks for your advice. I will not take it for granted from now on.
Upon checking PQB3 and PQB4 here are my resistance readings:
1st MOSFET PQB3:
Source and Drain = 2.45 Megohms
Source and Gate = 2.59 Megohms
Gate and Drain = 4.48 Megohms
2nd MOSFET PQB4:
Source and Drain = 3.38 Megohms
Source and Gate = 2.60 Megohms
Gate and Drain = 3.19 Megohms
With power on, here are my voltage readings for PQB3 and PQB4...Leave a comment:
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Re: Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
Thank you very much for your reply. To answer your questions.
Do you have the usual 19v from the power adapter?
Answer:
Yes 19v is present in the DCIN Jack up to the first mosfet.
Start at the dcin connector and confirm how far this voltage travels. There will be typically 2 x DCin mosfets. What voltage to ground is on each pin of these mosfets?
Answer:
I never tried to check on the 2 DCIN mosfets because the SY8286CRAC 5VALW IC is functioning normally...Last edited by lgcyber; 11-19-2022, 10:35 AM.Leave a comment:
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Acer Aspire 5 A514-54-37V6 No power and no RSMRST# present
Hello guys can you check if my analysis is correct? No 3.3v in EC_RSMRST# pin power button pressed or not. After pressing power button, 3V_EN will have 3.3v then back to 0v so PU301 will not produce +3VALW and the laptop will not turn on. I've checked the resistance of 3V_EN pin and it is not shorted. Is it because the SIO is defective already or do I need to reprogram it? By the way, is this SIO ENE KB9052QD programmable? I've included the Boardview and a reference schematic diagram LA-K092P(No KA-K093P available). Thanks to all who will answer.... -
Re: ViewSonic VT2430 power cycling
Anybody with a firmware for this? We cant find any Viewsonic Service Center in our country. Maybe someone can help me? Thanks....Leave a comment:
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Re: schematic hp 2570p
Its different from 2570p schematic. Even the labels did not match.Leave a comment:
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Re: Black screen Samsung syncmaster 203B
This thread is very helpful because I had some insights on how to trace errors like this. Nice job AGENT44!Leave a comment:
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