Re: Need Help with Lenovo G400 BIOS
For fddizon,
hello, same problem here for g400 no display. i downloaded the file in your attachment, can you help me the steps how to execute this file? Thanks in advance.
I'm not a computer tech but hoping its a basic approach...
PapaFi
Member
Last Activity: 03-01-2021, 10:38 PM
Joined: 08-19-2019
Location: Laguna
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Last edited by PapaFi; 11-30-2020, 09:52 PM. -
Teac AG-D9260 AV Receiver Audio Problem
After turning ON the unit, as the 2nd relay clicks. No audio response even radio or from dvd player. During vol adj from remote/manual adj as the vol increased there's a loud "tic" sound from the speaker. Even up to max vol still no audio. As you played the adj +/- from remote/manual along with the loud "tic" sound. All of a sudden the audio turned ON but uncontrolled vol even +/- adj. looks the audio is stuck on its level of vol. Even max/min audio level is the same (but the "tic" sound still there as the adj from min to max and vice versa and of course as you reached... -
Huntkey PSU HK340-72fp Problem
Hello, I have this PSU and wanted to repair. I already forced ON the unit by connecting the gray wire (ps on) and black wire (grnd). Result was no output for all the voltages. Main cap reads 301vdc, mosfet drivers not shorted. And obviously no voltage thru the secondary chopper. Do you have a copy of schematic diagram for this PSU?
Expert opinions and Tips are welcome.
Hope to hear from you, Experts!
Thanks... -
Re: acer aspire 4755 shorted
Hello @piernov, @mcplslg123, @zhang, @techtiger, thanks to all you guys!!! My Acer Laptop is now repaired! Found shorted cap PC4314 connected between PU4308 Drain and PU4309 Source. I saved a lot of money for this haha...Thanks again and God bless!Leave a comment:
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Re: acer aspire 4755 shorted
@Zhang and @ techtiger, you mean i need to check all the PU's (source) and its nearby inductor coil then if it short, i need to remove its respective PU's right? Thanks...Leave a comment:
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Re: acer aspire 4755 shorted
Hello @techtiger, is Zhang means if PU4001 source is shorted to "all of the inductor coil", i need to remove Pu4001, right?Leave a comment:
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Re: acer aspire 4755 shorted
Hello @zhang what do you mean by PL rail? is it power line? ThanksLeave a comment:
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Re: acer aspire 4755 shorted
Hello @zhang, welcome to my journey of t'shooting my own laptop.
I you dont mind, what is PL? And what do you mean by upper mosfet of that PL? Is it Power Line, i guess...Thanks.Leave a comment:
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Re: acer aspire 4755 shorted
Hello @mcplslg123 thanks very much for another options to make for fast t'shooing.Leave a comment:
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Re: acer aspire 4755 shorted
Hello @mcplslg123, yes but think i wasnt lucky enough to find out which cap haha. Lots of caps was in short as i beeped, but still its not the one. in your expert opinion, which cap you will removed first for starter... i dont want my mb exposed more to heat station.
May be you can guess it which cap. thanks...Leave a comment:
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Re: acer aspire 4755 shorted
@mcplslg123, piernov its been a while. tough times in t'shooting which compnt is shorted.
need more patience...Leave a comment:
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Re: acer aspire 4755 shorted
@mcplslg123 thanks very much. I labeled it right hehe...Leave a comment:
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Re: acer aspire 4755 shorted
@mcplslg123, thanks very much for added help options. one more thing, can you correct the image og mb I sent to piernov. where is the gpu or pci in there?
Thanks again....Leave a comment:
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Re: acer aspire 4755 shorted
Oh felt sad, i dont have that kind of psu. Can you indicate the high-side MOSFET that supplies GPU/PCH? For the mean time I'll try to check those mosfet since i dont have psu.
Thanks again.Leave a comment:
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Re: acer aspire 4755 shorted
Already downloaded the schematic you sent. Can you tell what page in the file?
Find it hard to see the components.Leave a comment:
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Re: acer aspire 4755 shorted
Hello, i dont have psu but using battery from 1.5v, 3v... and so on will work, right? can you please correct the picture w/c is the gpu/pch? thanks.
And if i may, where is the shorted high side mosfet that supplies gpu/pch?...Last edited by PapaFi; 08-19-2019, 09:59 PM.Leave a comment:
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Re: acer aspire 4755 shorted
Hello, I dont have psu, but battery 1.5v, 3v and so on may work, right?
Can you point out the gpu/pch in the pic i sent...Leave a comment:
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Re: acer aspire 4755 shorted
Hello piernov, can you ssend me name of components to check? PU4001 source seems shorted to ground as per your advice. thanksLeave a comment:
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Re: acer aspire 4755 shorted
Pu3802 source to grnd is 45.27k. PU4001 source to grnd is 1.8ohms.
Input jack between positive and negative 301k....Leave a comment:
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acer aspire 4755 shorted
Hello, my acer laptop 4755 series shuts down its power adapter/charger. But the power adapter/charger is good. After unplugging and plugging to outlet, 19v is present. Upon inserting its dc plug to dc in of the laptop, adapter shuts down again, no 19v out put. Laptop seems shorted? Any idea is the what comp is the culprit? Can you give me schematic? 2 Mofets PU3802, Pu4001 is good. Isolate the HDD, DVD RoM, Memory still no luck. Help...Thanks in advance.Last edited by piernov; 08-19-2019, 03:57 AM.
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