Acer No power A4WAB LA-C341P REV 1.0
Collapse
X
-
-
Re: Acer No power A4WAB LA-C341P REV 1.0
the caps is not shortedComment
-
Comment
-
Re: Acer No power A4WAB LA-C341P REV 1.0
1) PR317 should be 100k 0402 1% tolerance.
2) Based on the same page in the schematic, with 100k & 316k voltage divider using +3VALW, this configures this charger IC to support 3.966A of current.
This will only occur if there is a non-zero value at the middle junction of these 2 resistors.
Currently (no pun) you have 0 volts at this common pin # 10 (ILIM).
3) Confirm that the pin #10 of PU301 is not shorting to something else under the chip. Perhaps even consider to flux and reflow this IC. Then check the voltage on this pin again.
4) Aside from the above, believe that you should consider sourcing a fresh IC and replace this PU301 and then test again.
5) As a test, you can remove PU301 but also remove PL302 and then power up and check the voltage at the pad for Pin # 10.
Based on the 2 resistor values, this pin must be a non-zero voltage value.
I would also source a 100k 0402 1% resistor to replace the 87k one on the logic board.
The reason to remove the PL302 is to prevent any voltages from being sent downstream in the absence of this PU301 IC. Thought is that PU301 is now strapping the Pin #10 to ground, either due to a solder short and internal defect.Comment
-
Re: Acer No power A4WAB LA-C341P REV 1.0
1) PR317 should be 100k 0402 1% tolerance.
2) Based on the same page in the schematic, with 100k & 316k voltage divider using +3VALW, this configures this charger IC to support 3.966A of current.
This will only occur if there is a non-zero value at the middle junction of these 2 resistors.
Currently (no pun) you have 0 volts at this common pin # 10 (ILIM).
3) Confirm that the pin #10 of PU301 is not shorting to something else under the chip. Perhaps even consider to flux and reflow this IC. Then check the voltage on this pin again.
4) Aside from the above, believe that you should consider sourcing a fresh IC and replace this PU301 and then test again.
5) As a test, you can remove PU301 but also remove PL302 and then power up and check the voltage at the pad for Pin # 10.
Based on the 2 resistor values, this pin must be a non-zero voltage value.
I would also source a 100k 0402 1% resistor to replace the 87k one on the logic board.
The reason to remove the PL302 is to prevent any voltages from being sent downstream in the absence of this PU301 IC. Thought is that PU301 is now strapping the Pin #10 to ground, either due to a solder short and internal defect.
I tried the option to remove the PU301 and the PL302
Checking voltage at
PQ302
5. 19V
1,2,3, - 0V
4 -0V
PIN 10 of pad #10 0v
maybe it has no voltage beacause it wont allow the PQ302to passs the 19v?Comment
-
Re: Acer No power A4WAB LA-C341P REV 1.0
No. If the 316k is mated to +3v3Alw which it is and the 100k is truly to ground (confirm this) then you have a resistor based voltage divider. For this reason, this cannot be 0 volts unless one of these resistors is defective or not as connected in the schematic.
Google "resistor voltage divider calculator" and punch in the 3.3 volts; 316k, 100k value to see the expected voltage value.
https://ohmslawcalculator.com/voltag...der-calculatorComment
-
Re: Acer No power A4WAB LA-C341P REV 1.0
No. If the 316k is mated to +3v3Alw which it is and the 100k is truly to ground (confirm this) then you have a resistor based voltage divider. For this reason, this cannot be 0 volts unless one of these resistors is defective or not as connected in the schematic.
Google "resistor voltage divider calculator" and punch in the 3.3 volts; 316k, 100k value to see the expected voltage value.
https://ohmslawcalculator.com/voltag...der-calculatorComment
-
Re: Acer No power A4WAB LA-C341P REV 1.0
Check the resistance on the 100k resistor. Is it zero ohms at the pin that mates with the 316k?
Is the other pad of the 100k really mated to ground?
Remove the cap in this area to rule out the cap as a short.Comment
-
Re: Acer No power A4WAB LA-C341P REV 1.0
Yes everything is mated to ground the cap was remove then tried to plug power no voltage reading again to the resistorsComment
-
Re: Acer No power A4WAB LA-C341P REV 1.0
I now tried to change thePU301 blinking LED at the power led the charging light and the blue light its taking only 6 amps unstable..
PQ302
pin 1- 0v
pin 2-4- 0v
pin 5 20v
PU301
PIN 1 -20V
PIN 2 - 20V
PIN 3 - 10-11V not stable
PIN 4 - 11, 12, 13 not stable
pin 5- 1v not stable 1.1v
pin 6 - 2.7v stable
pin 7 -0v
pin 8 - 3.3v
pin 9 - 3.3v
pin 10 - 0v
pin 11- 24v
pin 12 - 20v
pin 13 - 20v
pin 14 - 0v
pin 15 - 0v
pn 16 - 6.0v stable
PIN 17 -20V STABLE
PIN 18 - 20V STABLE
PIN 19 - 20V
PIN 20- 20V
PL402 - 3.3V
PL404 - 5VComment
-
Re: Acer No power A4WAB LA-C341P REV 1.0
First of all, your AC power supply must be working properly. charge control voltages are in the picture. The IO needs to receive +3V LDO and AC_OK signal to work. By sending EC_ON after the IO AC_OK signal, +3v and +5v are activated. ILIM is not so important, it can be 0. If there is no short circuit in the +B19 line, the PU301 charge control voltages should be as follows.I'm not happy to be so strong. because it's not humanlyComment
-
Re: Acer No power A4WAB LA-C341P REV 1.0
First of all, your AC power supply must be working properly. charge control voltages are in the picture. The IO needs to receive +3V LDO and AC_OK signal to work. By sending EC_ON after the IO AC_OK signal, +3v and +5v are activated. ILIM is not so important, it can be 0. If there is no short circuit in the +B19 line, the PU301 charge control voltages should be as follows.Comment
-
-
Comment
-
Comment
-
Comment
-
Re: Acer No power A4WAB LA-C341P REV 1.0
If the board is plug without power press I only have 5V present @ PL404 I dont have 3V @ pl402 . Ive check resistance of PL402 around 3kilo ohms PL404 5KILO OHMS. If I press power it will produce a stable 3.3v and 5v but it only takes 8milliamps to 10 milliampsComment
-
Re: Acer No power A4WAB LA-C341P REV 1.0
First of all, your AC power supply must be working properly. charge control voltages are in the picture. The IO needs to receive +3V LDO and AC_OK signal to work. By sending EC_ON after the IO AC_OK signal, +3v and +5v are activated. ILIM is not so important, it can be 0. If there is no short circuit in the +B19 line, the PU301 charge control voltages should be as follows.Comment
Related Topics
Collapse
-
This specification for the Acer Aspire Aspire 9920 G-933G64HN can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Aspire 9920 G-933G64HN boardview and Aspire 9920 G-933G64HN schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet,...09-06-2024, 05:27 AM
-
This specification for the Acer Aspire Acer Aspire 7 Charcoal Black Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Acer Aspire 7 Charcoal Black boardview and Acer Aspire 7 Charcoal Black schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties...09-07-2024, 05:00 AM
-
This specification for the Acer Swift Acer Swift 3 Ultraschlankes Notebook Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Acer Swift 3 Ultraschlankes Notebook boardview and Acer Swift 3 Ultraschlankes Notebook schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that...09-07-2024, 05:00 AM
-
This specification for the Acer Nitro Acer Nitro 5 Black Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Acer Nitro 5 Black boardview and Acer Nitro 5 Black schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet,...09-07-2024, 04:10 AM
-
This specification for the Acer Aspire A317-53-37SZ + Pack Gold Acer 17'' Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the A317-53-37SZ + Pack Gold Acer 17'' boardview and A317-53-37SZ + Pack Gold Acer 17'' schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we...09-07-2024, 03:10 AM
- Loading...
- No more items.
Comment