Re: Asus K53SV - turn on with battery only
looking around, I found this [url]https://drive.google.com/open?id=0B4eDDk7o_vmnU1Y4WEYwd09QNHgyLWFPbFVZOEZyQ2dKLUJv[/url]
It had a marking on it W2F and founf out that its PMBT2907.Re: Asus K53SV - turn on with batter... its PMBT2907.Re: Asus K53SV - turn on with battery only
looking around, I found this [url]https://drive.google.com/open?id=0B4eDDk7o_vmnU1Y4WEYwd09QNHgyLWFPbFVZOEZyQ2dKLUJv[/url]
bigsam731
Member
Last Activity: 01-14-2018, 12:54 PM
Joined: 10-24-2016
Location: il
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Re: Asus K53SV - turn on with battery only
I have the same board with the same problem. but these are reading I got on BQ24740:
1 3.3v
2 19v
3 19v
4 0v
5 2.6v
6 2.6
7 0v
8 0v
9 0v
10 3.2v
11 3.2v
12 0v
13 3.3v
14 0v
15 0v
16 0v
17 0v
18 1.5
19 1.5v
20 3v
21 0v
22 0v
23 0v
24 1.3v
25 2.2v
26 2.2v
27 2.8v
28 4.4v
I'm trying to find out why am I only getting 4.4v instead of 19v on pin 28Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
Pin 2 is switched. I checked the voltage while the laptop in in the off state and got 2.1MV. and will install the resistor once I receive the order.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
I will double check and make sure that pin 2 has switched power. Laptop should be plugged into power or the battery and in the off state when I do the test correct?
Also, why do I need a resistor between the two pins? And what type of resister should I use? Please forgive my ignorance on the last two questions, I just want to learn.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
I did disconnect the wire going back to pin 18 from pin 36. I just connected it to pin 2 without a resistor. what does S3, on pg. 2 of the schematics, have to do with LCDVCC?Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
OK. Ill hold off on it and use it as is for now till Mr. Budm can figure something out. Please let me know if you need me to do more testing or anything else. I really appreciate you guys help.Last edited by bigsam731; 10-30-2016, 03:51 PM.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
Looking at the schematics, I don't see any other switch to turn on pin 36 besides IT8518. I think I'm going to change it in a few days and see if that is the problem. Unless someone else can tell otherwise.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
These are the reading I got for the same pins with no power:
11= 24.2K
21= 72.5K
26= 26.9K
95= 41.8K
96=9.2K
18=1.1Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
I wasn't really sure which pins to test but I test but I testes few of the them. I tested pins 11,26,95,96,21 and they all had 0 ohms.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
I'll test more pins and let you know.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
So do you think that I should change that chip? Or is there any other command not coming in to turn on pin18?Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
these are the reading that I got from both pin 18 on IT8518 and pin 36 on LCD connector.
[url]https://drive.google.com/open?id=0B4eDDk7o_vmnYXpIV3hyUnJGdGFkQkpEZS0xWklJWHUxNWNN[/url]
[url]https://drive.google.com/open?id=0B4eDDk7o_vmneExweXBMSTNSTlluRllMMndhd09mLUpHOGtj[/url]Re: Dell inspiron N7110 LCD no back ...WHUxNWNN[/url]...Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
I meant what said. I fix lots of things but this is kind of a starting point for me on board repair. I'm just glad to see other people give their expertise, time, and afford to help other in my position. So please don't take this the wrong way.
Now we figure out that it was a misread on my part, thanks to Mr. Budm, I need to figure out the actual cause of the low voltage....Last edited by bigsam731; 10-28-2016, 06:24 PM.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
This is why you are the expert and I'm not.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
here is a pic with voltage read.
[url]https://drive.google.com/open?id=0B4eDDk7o_vmnTTIzdlFmZHNRMzc3N2xrRTBZRm5iQUVFNFlZ[/url]
I also got the same readings on R472 and pin 18 on IT8518.Re: Dell inspiron N7110 LCD no back ... 18 on IT8518.Re: Dell inspiron N7110 LCD no back light
here is a pic with voltage read.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
I used different GND and I still got 19V on pin 36. And yes that is the only connection I see between pin 36 on pg. 18 and pin 18 of IT8518. However, there is a resistor (R472) on page 18 that is between the two pins. I might be wrong but I don't see any other connections there. I don't understand how IT8518 is supplying 19V to pin 36 unless its coming from somewhere else.Last edited by bigsam731; 10-28-2016, 06:40 AM.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
Thank you for the reply. When I connected pin 36 wire to pin 2, I disconnected from the motherboard side. So the backlight is only getting power(3.3V) from pin 2. When I looked at the schematics for the motherboard, pin 36 is suppose to have 3.3V from IT8518. But it has 19V for some reason and I don't know why.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
The chip is warm but nothing out of the ordinary. I think it might be a defective IT8518. I might leave the cable the way it is and maybe change the chip at a later time.Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
I really don't know what is the cause 19V on pin 36. I know that it's not connected to pin 38. the only thing that I can see between pin 36 on IT8518 is the R472 resistor which i de-soldered and tested OK....Leave a comment:
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Re: Dell inspiron N7110 LCD no back light
So this what I did for a test, I attached pin 36 on the LCD cable to pin 2. And sure enough, I NOW have back light on the LCD. I know its a bad soldering job but I figured it was just a test. Here are some pics...
[url]https://drive.google.com/open?id=0B4eDDk7o_vmnYUV6R2JxcmpwUHo3OS1CTWJWUkc0b082cnhB[/url]
[url]https://drive.google.com/open?id=0B4eDDk7o_vmnSlNrR3J3SEd6M0RJaEdxZXBWRVZNbHB0S05B[/url]Re: Dell inspiron N7110 LCD no back ... the LCD cableLast edited by bigsam731; 10-26-2016, 06:18 PM.Leave a comment:
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