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Rusty!
Rusty!
Learn by doing
Last Activity: 08-14-2013, 12:41 PM
Joined: 06-04-2012
Location: Portsmouth
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  • Rusty!
    replied to Odd Thermaltake TR2 550 problem
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Odd Thermaltake TR2 550 problem



    Unfortunately bin day came and I figured I was never going to manage it, and let it go. Looking at it, pretty much everything is either under a large heatsink of surface mounted on a small daughterboard, I think me with a multimeter was never going to manage it once we'd got the basics outta the way ...
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  • Rusty!
    replied to Odd Thermaltake TR2 550 problem
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Odd Thermaltake TR2 550 problem

    So in short, sling it out?
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  • Rusty!
    replied to Odd Thermaltake TR2 550 problem
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Odd Thermaltake TR2 550 problem

    Yeah just a DMM, no scope here.

    I can't see any bad joints, although some of them look more like MIG weld blobs where multiple wires are being joined.
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  • Rusty!
    replied to Odd Thermaltake TR2 550 problem
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Odd Thermaltake TR2 550 problem

    PS_ON is showing 2.41v with ATX disconnected.

    I don't have a resistor handy, but tried purple to green with a handy bit of wire, nothing happened. Will see if I can rob a resistor out of something and try that next.
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    Last edited by Rusty!; 07-01-2013, 09:22 AM.

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  • Rusty!
    replied to Odd Thermaltake TR2 550 problem
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Odd Thermaltake TR2 550 problem

    Checked PWR_OK signal, it's 0.10v when in "standby" and 4.92v when fully on. Looked up the ATX spec and that seems to be within the thresholds they should be, so at least this thing is doing something right.
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  • Rusty!
    replied to Odd Thermaltake TR2 550 problem
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Odd Thermaltake TR2 550 problem

    Yeah, with another PSU (and a few adaptors) everything behaves as normal.



    Green wire is showing 2.41v in this weird "off but still kinda running" state, measured between it and either of the adjacent ground pins....
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  • Rusty!
    started a topic Odd Thermaltake TR2 550 problem
    in Troubleshooting Power Supplies and Power Supply Design

    Odd Thermaltake TR2 550 problem

    Well it's is to me, at least.

    The aforementioned PSU powers my PC like a champ, however, it can't stop powering it! Tell the PC to shutdown, and it only half does... fans still spin, power LED remains lit. The LED on the PSU turns orange to indicate that it "thinks" it's properly shut down, and the EON Powerdown it's plugged into kills the monitor and speakers, so it has dropped its power consumption significantly.

    The PSU fires up (well, not exactly, but can't think how else to describe it) with no motherboard connected, multimeter shows both 5v and 12v...
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  • Rusty!
    replied to Hanns-G HH191/HSG1070
    in Troubleshooting Computer Displays
    Re: Hanns-G HH191/HSG1070

    Thanks, gave it a try (along with anything else I disturbed during the process) but it still the same. Always the way, heh
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  • Rusty!
    replied to Hanns-G HH191/HSG1070
    in Troubleshooting Computer Displays
    Re: Hanns-G HH191/HSG1070

    Semi-fixed. I think I might have ballsed the T-CON when stripping & rebuilding the panel as it now* has faint vertical lines on the screen, and it's present on the OSD so it's not being fed a bum signal.

    Whoops

    *Well, I say now, it could well have been like it beforehand as I wouldn't have noticed with it only staying lit up for a second.
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  • Rusty!
    replied to Hanns-G HH191/HSG1070
    in Troubleshooting Computer Displays
    Re: Hanns-G HH191/HSG1070

    You're right on both counts, it is a 50v 10uf cap, and the problem was the ccfl's, the screen stays on with new ones bodged in (they didn't quite fit as they came). Great diagnosis, you're like the House of LCD's
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  • Rusty!
    replied to Hanns-G HH191/HSG1070
    in Troubleshooting Computer Displays
    Re: Hanns-G HH191/HSG1070

    Yeah no problem, I'll have a look tonight... I plan to be back in the thick of it again, as I've got my hands on another 19" panel now (the aforementioned broken one, I've popped the trashed LCD out of it leaving just the backlight and frame now).

    Edit: What sort of values should I be looking for on C806? I only have a basic multimeter, so capacitance values are out.
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    Last edited by Rusty!; 06-07-2012, 06:01 AM.

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  • Rusty!
    replied to Hanns-G HH191/HSG1070
    in Troubleshooting Computer Displays
    Re: Hanns-G HH191/HSG1070

    Dang, it was also sounding so simple for a second

    I'll have access to the butcher-able panel on Wednesday when I'm back in work, so hopefully something more will come to light when I have something to swap out.

    Thanks for all the help and info, this place is great!
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  • Rusty!
    replied to Hanns-G HH191/HSG1070
    in Troubleshooting Computer Displays
    Re: Hanns-G HH191/HSG1070

    Pics of the other board is no problem (there is only one), so I've attached them.

    Getting readings of CN1 is proving to be a right bastard, though. It is completely unstable, to get anything other than 0.00 I have to keep switching the monitor on and off, and even then the reading I do get lasts about a second.

    This seems to correspond with the time that the screen will stay lit for, so I am gonna put my neck on the line and say that the panel/CCFL is not the culprit here?

    Also, despite your warning, I managed...
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  • Rusty!
    replied to Hanns-G HH191/HSG1070
    in Troubleshooting Computer Displays
    Re: Hanns-G HH191/HSG1070

    Heh thanks, mobile phone cameras aren't all bad... yay for HTC I guess.

    As for the transformers, I get 450Ω for T1 and 461Ω for T2

    I don't have a spare CCFL kicking about, but I'm pretty sure I know where a screen I can butcher is (it's smashed though, but the backlight still works). I had a feeling all that caps would be pants, it's not like Hannspree are known for being super high quality!
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  • Rusty!
    started a topic Hanns-G HH191/HSG1070
    in Troubleshooting Computer Displays

    Hanns-G HH191/HSG1070

    Hi guys, I have picked up the above monitor (it has two model numbers so I thought I'd list both) for nowt because it suffers from the "two seconds to black" phenomenon. Flicking the power off/on will bring the picture back for a couple of seconds, then it's gone etc.

    Would be a shame to scrap it as I'm sure it can be fixed, however my initial investigations (as instructed by the sticky thread) have drawn a blank (this is quite possibly due to me being an idiot).

    The caps on the board are mostly Su'scon, with a couple of Samxon and one huge Elite thrown...
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