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Search: Posts Made By: nickBcap
Forum: Schematic Requests ONLY! 09-25-2021, 05:37 PM
Replies: 1
Views: 375
Posted By nickBcap
Re: Please schematic for Acer SW5-173

Hi, I am checking out this board now. The battery is not charging but sure the battery is good. Maybe you know how to test the battery? But one guy repaired battery not charging by replacing a chip...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-16-2020, 04:23 AM
Replies: 4
Views: 864
Posted By nickBcap
Forum: Troubleshooting Power Supplies and Power Supply Design 06-15-2020, 09:41 PM
Replies: 4
Views: 864
Posted By nickBcap
Hakko FX-888D toroidal transformer upgrade to 240V

Hi,
I was using a Singway 120-240V < > voltage convertor from Ebay but it was not good enough, it popped and the fuse in the Hakko blew also.
I have been looking at replacing the Hakko 110V...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-07-2020, 06:18 PM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

What does a resistor symbol with a line drawn the bottom points of the resistor symbol joining only those points mean? In the schematic along the AC_LED line is the symbol with the figures; 0_0402_5%...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-07-2020, 04:20 PM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

Thank you for the plain English explanation.
The first Dual Uni-Directional ESD Protection Diode, 3-Pin SOT-23 before the first MLCC is shorting and also the MLCC is shorting. But somehow power is...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-07-2020, 04:53 AM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

Here is the Link to the two PDF files of the two Double ESD protection diodes in
SOT23 - I hope the link appears in the post.
https://1drv.ms/u/s!Ap7-liQx-miLmpNrGSv6spkLNF17vQ?e=WXmCZQ...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-07-2020, 03:45 AM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

Can someone tell me please, why the Links to my One Drive to pdf files there are not showing in the Post. They have appeared in my previous posts. I thought the problem may be the https: prefix so I...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-07-2020, 03:41 AM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

Hi, right by the power charger port is a Dual Uni-Directional ESD Protection Diode which is shorted, I get no O.L. Beep like I do most of the capacitors and the other Dual Uni-Directional ESD...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-07-2020, 01:47 AM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

The Link I tried to post as an https: link does not appear to me in the Post previous to the Quoted post. What could be the reason for this?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-07-2020, 01:46 AM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

I had realized that yes, and maybe the decision to buy the RT8243A chips was hasty.
I am catching up with repair course now and waiting to when I understand what I am doing before I make any...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-06-2020, 09:20 PM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

In the photo the Coil R15 550 090 in the yellow circle is hot @ 64degrees celsius and the resistor (I think it is) 220uF 2R5 C47 to the top of the coil in the picture is hot and also the small chip...
Forum: General Computer & Tech Discussion 05-02-2020, 05:40 AM
Replies: 6
Views: 1,196
Posted By nickBcap
Re: computer motherboard repair courses

The repairs I am beginning to do are donated laptop repairs so it is not going to be so likely I will be repairing Macs, though I am interested in his videos.
I am more likely to go with the...
Forum: General Computer & Tech Discussion 05-01-2020, 10:12 PM
Replies: 6
Views: 1,196
Posted By nickBcap
Re: computer motherboard repair courses

Thanks for the names, I am looking at those guys now.
Forum: General Computer & Tech Discussion 05-01-2020, 05:29 PM
Replies: 6
Views: 1,196
Posted By nickBcap
Re: computer motherboard repair courses

You Tube is the first place I am looking for courses. I made a selection and saved them last night . Got to sort through them to see which is best for me.
The accents of some of the Indian...
Forum: Schematic Requests ONLY! 05-01-2020, 02:03 AM
Replies: 3
Views: 1,408
Posted By nickBcap
Re: Request for HP 260 G4 Schematic!!

Hi, Is this an ok thing for me to do, to carry on this Thread with the op's request because I have two of the HP 250 G4 motherboards and trying to repair them.
Bump for the HP 250 G4 motherboard...
Forum: General Computer & Tech Discussion 05-01-2020, 01:22 AM
Replies: 6
Views: 1,196
Posted By nickBcap
computer motherboard repair courses

Hi, I have the time and the inclination now to take on a computer repair course online.
Can anyone start me off with ideas. So Far I have seen repairers advertising curses on YouTube which seems...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 04-30-2020, 04:32 AM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

Ok thank you, I went and bought the chips anyway thinking to try the solder technique for the first time.
The two boards have different problems but are showing the same one symptom, 3 blinking...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 04-29-2020, 07:30 PM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

Hi, thank you but I am hoping to find a chip with the identical pins as the original IC.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 04-29-2020, 04:20 PM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

Hi, some photos.
Both boards have these identical model numbers revision and date of manufacture.
The motherboard is from an HP 250 G4 model number:
AHL50 / ABL52 LA-C7701P Rev: 1.0
2015 - 09 -...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 04-29-2020, 10:14 AM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

Now going by your find and what I need, this is the nearest QFN type I can see on Ebay, but not sure of the soldering technique nor the exact specs.
RT8243A RT8243AZ RT8243AZQ 8A=EC 8A=EF 8A=xx...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 04-29-2020, 09:52 AM
Replies: 22
Views: 2,771
Posted By nickBcap
Re: 20 pin 8A on HP 250 G4 mb - voltage regulator?

Wow, thank you but this is the wrong type. The original is a QFP, possibly VQFP ? with the pins on the outsides of the chip. But I can check this part number out and look for options. Thanks very...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 04-29-2020, 04:48 AM
Replies: 22
Views: 2,771
Posted By nickBcap
20 pin 8A on HP 250 G4 mb - voltage regulator?

Trying to find the correct replacement part for this IC.
I think it is a 3-5V voltage regulator and I have two motherboards with the same part with only the first figures to go by (8A) to locate...
Forum: Troubleshooting TVs and Video Sources 04-17-2019, 12:13 AM
Replies: 68
Views: 11,365
Posted By nickBcap
Forum: Troubleshooting TVs and Video Sources 04-12-2019, 08:43 PM
Replies: 68
Views: 11,365
Posted By nickBcap
Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

I am ok with the two larger capacitors, it is the two smaller capacitor placement positions I need help with.
Forum: Troubleshooting TVs and Video Sources 04-04-2019, 09:39 PM
Replies: 68
Views: 11,365
Posted By nickBcap
Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

Hi, will I be of any help here....? I was brought this TV board because I could solder and de solder and there was bulging capacitors on the power board. Exactly the same model, Samsung Board;...
Showing results 1 to 25 of 109

 
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