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Doom2pro
Member
Last Activity: 11-26-2018, 11:52 PM
Joined: 05-25-2013
Location: Glens Falls, NY
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  • Doom2pro
    replied to Odd Motherboard issue
    in General Computer & Tech Discussion
    Re: Odd Motherboard issue

    Alright so I decided to bite the bullet and whip out my heatgun and replace all four VRM MOSFETs (NOT an easy task) - which were 70N03S (70 Amp, 5mOhm RDS(on), 68W TDP) and replaced with 95N03LT (75 Amp, 5mOhm RDS(on), 115W TDP)...

    Seems to have resolved the issues, and I notice my VCore isn't fluctuating as much anymore also...

    Thanks everyone for the input
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    Last edited by Doom2pro; 06-20-2014, 02:16 PM.

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  • Doom2pro
    replied to best cheap/free scores 1.1
    in General Computer & Tech Discussion
    Re: best cheap/free scores 1.1

    Recently bought an EVGA Super Nova NEX750B 750W semi-modular 80 Plus Bronze supply on eBay that was advertised as "For parts/as is" with details "Does not power up". Got it for $20 free shipping, figured if I can't fix it, should be some good parts inside...

    Was expecting anything from an abused supply with signs of heat stroke, to lighting strike, scorched earth but what I received was a BRAND NEW, not a speck of dust inside, fresh smell power supply. Tried to power it up, and sure enough it wouldn't power on... However...
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  • Doom2pro
    replied to Hard drive dropped. Now works but "seek error rate" value skyrocketed
    in General Computer & Tech Discussion
    Re: Hard drive dropped. Now works but "seek error rate" value skyrocketed

    I have a Western Digital 160GB drive that would head dock repeatedly on spin up and sometimes it would detect the drive others not, and if it did detect the drive it would have read errors. I thought the drive had packed it in physically, but noticed that if the drive was given a solid whack it would stop clicking and work properly for a short time (few minutes)... This got me to unscrew the drive's PCB and when I flipped it over I noticed scorched/corroded pad contacts on the PCB that contact the...
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  • Doom2pro
    replied to Odd Motherboard issue
    in General Computer & Tech Discussion
    Re: Odd Motherboard issue

    I just replaced the ATX connector with a new one from another board, voltages improved 200mV on 5+ but still getting the same issues. Seems like the warm connector was just another symptom, possibly making things worse, but alas, not the cause.

    I'm starting to wonder if the VRMs packing it in, getting less efficient and drawing more and more current from +5.
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  • Doom2pro
    replied to Odd Motherboard issue
    in General Computer & Tech Discussion
    Re: Odd Motherboard issue



    Listen it's not the video card, I tried a PCI VGA card same issue... CPU activity should not be manifesting itself on the VGA signal, unless there is some issue with the card's power from the motherboard. Both Video Cards test out fine, no artifacts or glitches, just analog noise modulated to the CPU. Also, the CPU "noise" isn't manifesting itself only on the VGA signal but the Audio from Onboard Audio & PCI TV Tuner (Sound and Picture).

    As for Bad Caps on MX440, it was recapped years ago with Rubycons.
    ...
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    Last edited by Doom2pro; 06-13-2014, 11:26 PM.

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  • Doom2pro
    replied to Odd Motherboard issue
    in General Computer & Tech Discussion
    Re: Odd Motherboard issue



    Video Card is an nVidia MX440 AGP8X with 64MB... If it's the video card, why would the system random lock/reset under a CPU with a higher Clock/FSB & TDP?

    Also, I have tried 4 different sticks of DDR-3200, three different brands, all test good with Memtest86+.

    Edit: It might also be worth mentioning that this noise is NOT visible if I VNC (Remote View) the machine, it's only visible on VGA Display (LCD or CRT) and higher refresh rates seem to reduce the noise slightly....
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    Last edited by Doom2pro; 06-13-2014, 09:06 PM.

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  • Doom2pro
    started a topic Odd Motherboard issue
    in General Computer & Tech Discussion

    Odd Motherboard issue

    Hello, I have been experiencing an odd issue with a Gigabyte GA-7VT600 1394 motherboard where screen resolutions at 800x600 and above seem to have weird interference on the VGA display, which goes away during low CPU usage... The best way I can describe it is faint horizontal lines flickering like TV static visible on dark colors, and dark text seems to blur and jump, all in sync with CPU or Hard Drive activity, possibly gets less intense when machine warms up... Also, tons of noise on Soundcard/TV Tuner audio also in sync with CPU usage.

    I have recapped all large capacitors with...
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    Last edited by Doom2pro; 06-13-2014, 08:11 PM.
  • Doom2pro
    replied to No Picture or Audio on Insignia NS-LCD26A
    in Troubleshooting TVs and Video Sources
    Re: No Picture or Audio on Insignia NS-LCD26A

    There is a known fault with these power boards, not sure if it is causing your issue, but worth a try.

    Locate the 50v 47uF "JH" Capacitor near the DIP-8 IC (It has one leg missing), replace it with another 105C equivalent.
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  • Doom2pro
    replied to Insignia NS-LCD32 Problems
    in Troubleshooting TVs and Video Sources
    Re: Insignia NS-LCD32 Problems

    The whining is coming from the Power Factor Correction circuit, there is a known bad capacitor located there, it's usually "JH" brand, 50v 47uF... Replace it and the whining will go away, over time it will cause the set to not turn on if it's too cold (it has to be warmed up).

    The faulty capacitor is located near the DIP-8 IC (missing one pin).
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  • Doom2pro
    replied to Insignia 32" LCD TV Model# NS-32LCD
    in Troubleshooting TVs and Video Sources
    Re: Insignia 32" LCD TV Model# NS-32LCD

    I have an Insignia 23 inch LCD and the symptoms were when the TV was cold if I pressed the power button the set would not turn on and if I held down the power button the Green LED would turn on then off, over and over, and I would hear a faint whining sound from the PSU. Keeping this up would eventually cause the set to turn on, and a noticeable high frequency whining sound would be heard while it was running. A hair dryer would get the TV on quicker, so it was obviously temperature related. If the set was turned off after running a while,...
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    Last edited by Doom2pro; 11-13-2013, 05:03 PM.

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  • Doom2pro
    replied to 32 Inch LCD (Onida) issues, MLT688 rev 1.6 Power board
    in Troubleshooting TVs and Video Sources
    Re: 32 Inch LCD (Onida) issues, MLT688 rev 1.6 Power board

    JH Capacitors will fail looking pristine, no bulging or discoloring, their failure is a massive increase in ESR and heating them with a soldering iron or heat gun will make their ESR go down a bit which might make the device power up or function properly which can help aid in finding the suspect device if you don't have an ESR meter.

    It's best to replace all of them, even any that have not failed with equivalent brand name capacitors, like Rubycon, Nichicon, Panasonic etc....
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  • Doom2pro
    replied to No Picture or Audio on Insignia NS-LCD26
    in Troubleshooting TVs and Video Sources
    Re: No Picture or Audio on Insignia NS-LCD26

    I have this TV and had to repair it due to it not turning on, which started as being hard to turn on, having to hold the power button down longer.

    I could hear the power supply's regulation loop cycling over and over as I held the power button down, so I took my soldering iron and heated up each electrolytic on the secondary side and it started to make a high pitch wine and the TV turned on. I cooled them with canned air (held upside down) and tried to turn the set on again, the power supply would cycle over and over without...
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