My OSSC 1.6 is dying

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  • #37149
    trapexit
    Participant

    I have a 1.6 OSSC (from VGP). A couple months ago I noticed it acting a little flaky in that it wouldn’t seem to sync to my OG Xbox component consistently but didn’t really think much of it. Recently however it’s really gone down hill. It can take a full minute for it to output an HDMI signal and show the test screen when powered on and when it syncs to any input it flakes out after a short time (less than 2 minutes). It’ll sync and desync over and over. Sometimes long enough to show display something but mostly not. After taking it out of the case I noticed U7 and U6 were hot. Too hot to touch. Especially U6. Still can feel it on my fingertip 30 minutes later hot.

    I suspect that’s not normal but does anyone know what’s more likely… that that’s the cause or a symptom? Replacing them would be easy and cheap but has anyone come across such behavior?

    Thoughts? Suggestions?

    #37176
    haloharry
    Participant

    Am happy am not the only one.
    My 1.6 has been taking it take syncing to my gamecube official component cables.

    Sometimes I have to unplug them and replug them back in for it to sync up.

    #37177
    trapexit
    Participant

    I tested the voltages on the regulators I mentioned and they seemed correct but their heat is unnerving. Can someone check theirs to see if U6 and U7 get really hot (and their input and output voltages if possible)?

    #39805
    BonzoBits
    Participant

    Yes, U6 and U7 get very hot on my OSSC.

    I’ve spent a lot of time reflowing and reconnecting most components on my OSSC. I’ve fixed the issue the unit was having with resetting itself, but I now have ongoing problems. I’m not sure it’s a sync problem though – the LCD display continues to display the incoming signal info (which means it hasn’t lost sync?). The issue on this OSSC that the red LED lights up and the output signal is dropped.

    #41224
    bni
    Participant

    I have this problem on my 2 years old 1.6 OSSC

    All of a sudden it has started to lose sync after 2 minutes, and display garbage characters on its LCD. If I restart it it wont even give the checkerboard test image. If I wait 10 minutes it will work 2 minutes again.

    I took it out of the case and notice U6 is very hot, I burned my finger tip, ouch.

    Has been working flawless for 2 years but now it’s useless.

    Considering buying a new one when they get back in stock, because I really like it. Has there been any improvements made on the board or will I encounter this issue again with new board?

    #41228
    bni
    Participant

    Also I want to add it will malfunction also after a few minutes if I just power it on and leave without anything connected to the AV1

    #41233
    trapexit
    Participant

    There appears to be some semi-common issue that leads to this given the reports from a number of people with the same symptoms. I’ve not yet had the time to replace U6 and U7 to see if that’s the problem.

    #41235
    bni
    Participant

    I measured the temperature on U6 to reach 90 degrees celsius, surely that cant be normal.

    Couldn’t measure voltages, noting registered, but maybe I’m doing it wrong.

    Could it be that there is a short between the pins to U6, there are 3 solders that are very close to each other on one side of U6

    #41271
    bni
    Participant

    I found some posts an video talking about “unattenuated RGB sync line” and that some devices can damage the OSSC.

    I recently got a new Amiga (A1200) and the OSSC breaking down coincided approximately with that, after having used it for 2 years with an A500 without problems.

    Anxious now to get a new OSSC if that will break too. In that case is it covered by warranty? Im not using some obscure arcade board or someting its just a standard A1200

    Relised now this post is in the DIY forum, but my OSSC is bought complete from videogameperfection.com in august 2018

    #41346
    marqs
    Participant

    Have you measured the PSU output voltage under load? U6 is a 3.3V regulator driven directly by PSU which is nominally 5.0V. Some 5V PSUs have a bit higher output, for example 5.5V. That 0.5V would increase the power dissipated by the regulator by 30% which has a major effect on its temperature.

    #41348
    bni
    Participant

    Thanks for the suggestion marqs

    Just measured this on the PSU:
    Not connected to the board: 5.01 V
    Connected to the board and board powered on: 4.97 V

    So no issue here?

    btw the PSU I use is the one sold with my OSSC from videogameperfection.com in 2018

    #41349
    marqs
    Participant

    Does U6 get hot even when you’re displaying test pattern? Which input and line multiplication mode you used when the regulator was 90C?

    #41350
    bni
    Participant

    Yes it gets hot displaying the test pattern. I measured 90C with nothing connected. It does not seem to matter if anything is connected or not.

    Over the last 2 years I have only ever used the SCART input with my Amigas and RGB-to-SCART cable. Been using Line2x on my PC monitor and Line4x with my 4K TV.

    #41362
    marqs
    Participant

    That sounds like something is shorted / damaged. U6 supplies power to U1, U3, U8 and U17 – is any one those particulary hot during test pattern?

    #41363
    bni
    Participant

    I checked those, and yes U8 gets also very hot, up to 90C

    I studied it with magnifying glass, didn’t see any obvious damage or suspected shorts of the pins.

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