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more one happy thank you your share save the day even 2 years later . this bios dump work on HADES_HBS 14206-1 448.02W03.0011 🤙💪💪💪...
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Re: Ideapad 100 NM-A841, P channel mosfet on laptop in.
@mcplslg123
you are the best! SOLVED!
pq304 was in low impedance ,causing that i measure 10k on the pr303 - 200kohm pr303 resistor. i thought tha was the resistor but was the transistor. now gate voltage = 5v ✓
but i'm not getting ..why are there transistors here(pq304 and 305), protecting what ? PACIN send pq307A to ground and they conduct...than means mosfets only work if there is pacin present?for what is that? pacin is the one that activate the mosfets anyway...
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Re: Ideapad 100 NM-A841, P channel mosfet on laptop in.
Thank you. this explanation confirmes my doubts about this p chanel mosfet with reverse diode. i know they are used for reverse polarity protection here ,bus i was in doubt about the working principle here. know let me see whas happening on this gate for i have so high value o mosfets gate. (yes the laptop stills here waiting for i finish it...). always confirm every doubt before reheat and brake everything X)...
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Re: Ideapad 100 NM-A841, P channel mosfet on laptop in.
Exacly what i think ... so this pq307 receive PACIN signal and shoud starting ground the gate for this mosfets start work. that's it? but i dont understand if the pq302 diode is reversed it will conduct forward to p3??
resistors are ok.
datashet from pq302 [URL="https://pdf1.alldatasheet.com/datasheet-pdf/view/544500/WHXPCB/AO4455.html"](4455)[/URL] says vgs Threshold between -1.5v and 2.6v so power suply its around 20v - 17.7v from gate its 2.3v. Shouldn't be that gate ok for hold...
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Ideapad 100 NM-A841, P channel mosfet on laptop in.
Hello guys. i'm having problems here with this lenovo 110 with board NM-A841 laptop. There is an P channel(pq302) and after it i start ,i have 19v but with time, it decreases or if i press "power on" switch or jumper j6 , it falls to 0 and back to 19v. There is no short and works good on battery, but won't charge or charge until the voltage drop like i explain after P mosfet.
Well i suspect that this mosfet is no good. if you look to skematic i have steady 19v on P2 but start to decrease on P3 like if the mosfet is dying . the gate of boot N an P mosfet are the same: is steady...Last edited by SMDFlea; 07-17-2023, 10:47 AM. Reason: Added model to thread title,added image to badcaps
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Re: asus x505bp rev 2.0 bios need help
IT WORKS !! your work saved the day....
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Re: LG 55EC930V OLED - 3 Second Power No Display
On mine. i forced "power on" an "driver on" and it startup the selftest . the screen is bad and the mainboard is in "lockmode" and on forced power on never shuts down.
but without "forced power on"dont respond to instop or instart, but respont to "power only". The result it's the same, or i forced power on or it shuts down in 3 secs.
[url]https://photos.google.com/share/AF1QipM4N3P8GPBdHP0vvBg5yJJ6BbNFfeta7bLdceevOa9nRFnQLuHewbKXhok-KoQx_g?key=d2xVSVBrbkZ0cU5Yc...
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Re: LG 55EC930V OLED - 3 Second Power No Display
Hello friends. i tried anymote for the instop comand on my poco X3 pro that have IR but it dont work on this android anymore, any other app tha have this feature? thank you
ps: by the way ,my tv is off,i press on and it goes off after 3 secs. Even if i leave only the psu and mainboard connected. i gess its in error mode because any panel failure? but without unlock it i cant understandLast edited by tmaster21; 10-27-2022, 11:21 AM.
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Lg HI-Fi CM2460 -No disk
Hi. i have an hi-fi ,were i put an disk/cd and it just spin like half quarter the cd and stops .On screen says NO DISK . i suspected that the motor won't spin because its damaged, so i powered the motor with DC (between 1 to 5v) and afeter 1.5v it starts to spin, its an 5.9v motor(RF-300FA-12350) . Shoud be the power driver?(its an CD5888).
i mesure the exit of the driver to the motor and i get that from the picture above on the osciloscope.
for the ones that know with this devices(i'm not) it's normal kick in incrementally and stop?
[url=https://ibb.co/xDZCjw...
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Re: OnePlus 9 -No wifi or bluetooth
Yes you are right sometimes the antena its like an wire loop to gnd. I already bought an ZWX competitor software and found where the wifi/bt ic is. thank you.
is on back of the board ,near cameras hole and under a big shield.
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OnePlus 9 -No wifi or bluetooth
Hello . i have an OnePlus 9 to repair and i found that around ICs on right shield,have a lot os shorted caps. But i cant find any sckematic or service manual on this phone . Is this side wifi releated? i beleave that the black IC it's the wifi IC but the shorts are worst near the silver one .
even the center pin from antena have 1ohm . but the phone work(exept wifi or bluetooth that never enables)Any experience with that phone? thank you
[url=https://ibb.co/Y2J41Gn][/url]Hello . i have an OnePlus 9 to repair and i found that around ICs on right shield,have a lot os shorted...Last edited by tmaster21; 09-14-2022, 11:26 AM.
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Re: Sony Bravia 50w808C - Gliched screen!
unfortunally i get same result. each half screen shows some picture but gliching, like if some frames pass to lcd,other(majority) not. it's not syncing or updating the picture... can a faulty cpu or broken solder do that?
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Sony Bravia 50w808C - Gliched screen!
Hello guys. My bravia give up after only 4/5 years old. I post a video from what it does above. .I thoght it waas the tcom,ordered a new one from china ,and the problem stays exactly the same. Apears be an sync signal lost somewhere.
What is your gess?
[url]https://photos.app.goo.gl/FSmWjFuHBLcxmVcn8[/url]https://Hello guys. My bravia give u...ur gess?<br />Last edited by tmaster21; 07-13-2022, 07:38 AM.
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Re: LG 43UK6300 - Audio & Backlight, but no Video
Before reassemble everything,to be sure ,i feed 15v @300ma on AVCC on testpin from panel and it really was in in shortcircuit when powered,because without power, on multimiter it was hight impedance. I think it's a problem on ic's that ate inbuild on flatcables that connect inside the lcd.
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Re: LG 43UK6300 - Audio & Backlight, but no Video
Hello . I have one 43UN7100 here on repair shop right now,exacly same problem,same board...
left ribon cable makes the VCC from panel went down to 0v soon as i connect it. lvds cable disconected and i have 17v ready on cap near lvds conector(lcd power pins).
SO! the panel is pulling much current and the mainboard shut power off ,or is an feedback signal failling from panel to the board.
I will not order any mainboard because i belive the issue it's on panel.
the transistor that you talk...
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Re: Lenovo E15 ThinkPad NM-C421
Hello friends.There the boardview available for thi model? thankyou
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Re: Panasonic TX-L42WT50B half dead
Any one have experience on reflow this cpu chips on tvs? I see that the mainboard is very thin ,almost half of laptop board.
My idea is flux with liquid flux under the chip, and heat up a bit . i still have to see times and temperatures!? ,and i'm afraid that board bend with heat... any recommendations?
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Re: Panasonic TX-L42WT50B half dead
update: today i try an jumper wire from 3.3v sorce direct to pin 1(enable) from driver(ic5300) and that enable the 2 high and low side mosfets and 12v reached the t-con. So PNL12v line its OK . its just the cpu that don't enable it on power on... it's comon cpus stop working on that tvs? On computers i can't remember the last cpu that i change...
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Re: Panasonic TX-L42WT50B half dead
yes, it's there. I assume that was 15v because measured 15.60V that feeds that regulators.i measured again right now.Last edited by tmaster21; 02-04-2021, 08:11 AM.
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