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#274334 - 2018-03-18 12:52 G68 switching on & off?
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Registered: 2015-03-16
Posts: 67
Loc: Hong Kong / UK
The G68 worked well for an afternoon but today everytime it’s turned on, it switches off again? Not sure why or what the problem could be....?

Could the PSU be damaged or faulty?

Thanks,

Nick


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#274338 - 2018-03-18 13:36 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2004-10-20
Posts: 1,433
GMT Offline
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GMT Offline
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Registered: 2004-10-20
Posts: 1,433
Loc: Cambridge, Cambs, UK
I'd say there is a good chance that the PSU has gone. You can try different cables and power sockets to rule out these options.

If the PSU has gone, there is a chance that it will take out some of the DACs too. Good luck.

Cheers
Tom


Main: G68J, 218 HD621, 3*5200s (2 SE L&R),DSW, 2* Reviver, 3200s,SBT, PS4, Amazon TV Fire, Dune Base 3.0, Xbox, NUC (Roon server & Kodi)
Kitchen: 5200s, SBT, Chromecast
Office: A330i, G41, Explorer2,Velodyne CT120
F80s, M60s
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#274340 - 2018-03-18 14:12 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2016-11-27
Posts: 160
Struttmaster Offline
Hitchhiker
Struttmaster Offline
Hitchhiker

Registered: 2016-11-27
Posts: 160
Loc: Gold Coast, Queensland, Austra...
Check the power supply output. It may be low. It can be adjusted. Pretty sure it needs to be 5.1v.
Do a google search on this website and you will come up with discussion on the correct setting.


HT: G68ADV, HD621, 5000C, Marantz BD, 218, REL SW, analogue fronts & DSP5000 rears.
Office: Prime PS, MS200, Director, Woo Audio WA2 (w/ Tung-Sol tubes), Beyerdynamic T1's
Family Room: Allo digi, 568.2mm, 598, 3100's, REL SW
Upstairs: SBT, explorer2
BBQ/Party: Raspberry Pi, F80
Intel fanless NUC running ROCK
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#274350 - 2018-03-18 22:47 Re: G68 switching on & off? [Re: GMT]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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That sounds like it could be expensive. The PSU I’m guessing won’t be too bad but the DAC’s could be?

Thanks,

Nick


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#274351 - 2018-03-19 00:01 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2004-10-20
Posts: 1,433
GMT Offline
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I don't want to overly pessimistic at this stage, but there is a shortgae of spares for the G68 too.
Let's hope if it is hardware, it is only the PSU.

Cheers
Tom


Main: G68J, 218 HD621, 3*5200s (2 SE L&R),DSW, 2* Reviver, 3200s,SBT, PS4, Amazon TV Fire, Dune Base 3.0, Xbox, NUC (Roon server & Kodi)
Kitchen: 5200s, SBT, Chromecast
Office: A330i, G41, Explorer2,Velodyne CT120
F80s, M60s
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#274352 - 2018-03-19 00:15 Re: G68 switching on & off? [Re: GMT]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Oh no, that doesn't sound great.

Presumably a PSU is relatively easy to fit? How would you test the other components?

Thanks,

Nick


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#274353 - 2018-03-19 03:05 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2016-11-27
Posts: 160
Struttmaster Offline
Hitchhiker
Struttmaster Offline
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Registered: 2016-11-27
Posts: 160
Loc: Gold Coast, Queensland, Austra...
Try checking and adjusting the voltage output first. Same thing was happening to my g68 when I got it. Adjusted the voltage and it’s been fine since.


HT: G68ADV, HD621, 5000C, Marantz BD, 218, REL SW, analogue fronts & DSP5000 rears.
Office: Prime PS, MS200, Director, Woo Audio WA2 (w/ Tung-Sol tubes), Beyerdynamic T1's
Family Room: Allo digi, 568.2mm, 598, 3100's, REL SW
Upstairs: SBT, explorer2
BBQ/Party: Raspberry Pi, F80
Intel fanless NUC running ROCK
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#274426 - 2018-03-21 11:25 Re: G68 switching on & off? [Re: Struttmaster]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Registered: 2015-03-16
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How do I check the voltage - sorry if that sounds like a silly question... is it easy to check and easy to adjust?

Thank you


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#274434 - 2018-03-21 15:04 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2016-11-27
Posts: 160
Struttmaster Offline
Hitchhiker
Struttmaster Offline
Hitchhiker

Registered: 2016-11-27
Posts: 160
Loc: Gold Coast, Queensland, Austra...
I put “adjusting G68 power supply” into the google search at the top of the page and found this:
Quote:
First thing to do is disconnect the lead between the PSU and the motherboard (with the power OFF). If you have an ESD wrist band then put it on and connect the other end to the G68 chassis. If you don't have one you can probably get away with just holding the chassis with one hand while removing the PSU-motherboard lead with the other. Once you have disconnected this lead you don't need to use the ESD band, provided that is you don't touch any of the PCB's.

Next select an appropriate voltage range on your meter - anything between about 12V and 50V DC will do (do not select an AC range). 20V full scale deflection is probably best if your meter has it.

Next power up the G68 and connect from the -ve terminal on your meter (which should have a black probe lead connected to it) to one of the pins on the PSU which, until you disconnected it, had a black lead going to the motherboard. Then connect from the +ve terminal on your meter (red lead) to each of the pins in turn which had a red lead coming from them. As it's a UMEC PSU both readings should read 5V.

Keep the black lead connected to the same PSU pin and connect the red meter lead to where the yellow lead came from the PSU - this should read 12V.

Finally connect the black lead from your meter to where the blue lead came from the PSU and connect the red lead from your meter to where the black lead came from your PSU - remember we are checking here for a -ve voltage which is why you reverse the meter leads. All being well this will read 12V meaning you have -12V in reality.

Any significant variance from the above readings mean you have a faulty PSU. When I did these checks on my own UMEC PSU it was quite obvious there was a fault, all three voltages were way off.

Cheers, Roger.
Try also G68 PSU. It says below to adjust to 5v. Mine is set at 5.2v. When it was rebooting, like yours, it was reading 4.9v. You will also find lots of info on this site about replacing the power supply with a linear unit. (I still have to change mine, working on it...)

Good luck,
Andrew


HT: G68ADV, HD621, 5000C, Marantz BD, 218, REL SW, analogue fronts & DSP5000 rears.
Office: Prime PS, MS200, Director, Woo Audio WA2 (w/ Tung-Sol tubes), Beyerdynamic T1's
Family Room: Allo digi, 568.2mm, 598, 3100's, REL SW
Upstairs: SBT, explorer2
BBQ/Party: Raspberry Pi, F80
Intel fanless NUC running ROCK
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#274435 - 2018-03-21 15:13 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2016-11-27
Posts: 160
Struttmaster Offline
Hitchhiker
Struttmaster Offline
Hitchhiker

Registered: 2016-11-27
Posts: 160
Loc: Gold Coast, Queensland, Austra...
Here’s my original post G68ADV continually re-booting from when mine started playing up. There is a link amongst the replies with instructions on how to replace a faulty PSU.

Cheers,
Andrew


HT: G68ADV, HD621, 5000C, Marantz BD, 218, REL SW, analogue fronts & DSP5000 rears.
Office: Prime PS, MS200, Director, Woo Audio WA2 (w/ Tung-Sol tubes), Beyerdynamic T1's
Family Room: Allo digi, 568.2mm, 598, 3100's, REL SW
Upstairs: SBT, explorer2
BBQ/Party: Raspberry Pi, F80
Intel fanless NUC running ROCK
Edited by Carl; 2018-03-21 15:45. Edit Reason: Added link
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#274446 - 2018-03-22 03:02 Re: G68 switching on & off? [Re: Struttmaster]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Registered: 2015-03-16
Posts: 67
Loc: Hong Kong / UK
Thank you Andrew!! That's awesome - will maybe have a go, bit nervous about breaking something else....!


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#274448 - 2018-03-22 04:01 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Registered: 2015-03-16
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Loc: Hong Kong / UK
Just went to take a small video of what it was doing to show the guy I bought it from, and for some reason it doesn't seem to be booting now? The Meridian screen comes up and just stays lit? Not sure what's going on.....?


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#274449 - 2018-03-22 06:22 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2010-12-09
Posts: 3,298
Ratbert Offline
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Ratbert Offline
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Registered: 2010-12-09
Posts: 3,298
Loc: Europe
It is most likely the power supply as already discussed, have a read of this wiki document on G68 PSU replacement if it scares you then you need to find a friend or a repair shop to do it for you.


Always learn from the mistakes of others. You can never live long enough to make them all yourself.
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#274450 - 2018-03-22 07:40 Re: G68 switching on & off? [Re: Ratbert]
Registered: 2004-08-07
Posts: 7,420
Ian Offline
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Ian Offline
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Registered: 2004-08-07
Posts: 7,420
Loc: Surrey, England, UK
May also be worth getting connectors and cards checked that they are still seated properly. Wont be the first time that something previously working didn't after being transported.


Meridian owner since 1992
DSP5000 96/24, MC200, Prime & PSU, Focal Elear, Explorer 1 & 2, F80, 200/203 and various Sonos.
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#274452 - 2018-03-22 13:02 Re: G68 switching on & off? [Re: Ian]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Happy to get a friend to help - just wanted to show the guy I bought it from the issue so he doesn't think I'm just trying it on. Will try again tomorrow and just video whatever it does.

Will open it up and take a look smile

Thanks for the advice and help, sorry for lots of questions.


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#274794 - 2018-04-05 04:25 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Registered: 2015-03-16
Posts: 67
Loc: Hong Kong / UK
Massive thank you to SteveM! Managed to get the G68 up & running again last night!! Relieved to discover nothing else is damaged, thank you so much for your time & advice!


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#274795 - 2018-04-05 07:40 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2004-08-07
Posts: 7,420
Ian Offline
President of the Imperial Galactic Government
Ian Offline
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Registered: 2004-08-07
Posts: 7,420
Loc: Surrey, England, UK
And the problem was? PSU?


Meridian owner since 1992
DSP5000 96/24, MC200, Prime & PSU, Focal Elear, Explorer 1 & 2, F80, 200/203 and various Sonos.
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#274830 - 2018-04-06 06:41 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2016-11-27
Posts: 160
Struttmaster Offline
Hitchhiker
Struttmaster Offline
Hitchhiker

Registered: 2016-11-27
Posts: 160
Loc: Gold Coast, Queensland, Austra...
Curious too, did you replace the ps or tweak it?


HT: G68ADV, HD621, 5000C, Marantz BD, 218, REL SW, analogue fronts & DSP5000 rears.
Office: Prime PS, MS200, Director, Woo Audio WA2 (w/ Tung-Sol tubes), Beyerdynamic T1's
Family Room: Allo digi, 568.2mm, 598, 3100's, REL SW
Upstairs: SBT, explorer2
BBQ/Party: Raspberry Pi, F80
Intel fanless NUC running ROCK
Top
#274879 - 2018-04-07 10:01 Re: G68 switching on & off? [Re: Struttmaster]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Registered: 2015-03-16
Posts: 67
Loc: Hong Kong / UK
Yes, replaced the PSU & all has been so far!

Just been trying to get the comms ports to work to use the configuration software. The RS232 never worked so ended up using a USB cable which has worked but can’t access the HD621. Wondering if there’s really any value in connecting to it as the G68 seems capable of doing everything?!

So grateful for all the replies & advice on here, and Steve’s help has been amazing!


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#274880 - 2018-04-07 11:16 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2006-11-08
Posts: 4,000
dpstjp Offline
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dpstjp Offline
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Registered: 2006-11-08
Posts: 4,000
Loc: London, England
Are you sure the serial cable you were using was a null modem cable? Did you allocate a comms port to it?


Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.
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#274906 - 2018-04-07 21:59 Re: G68 switching on & off? [Re: dpstjp]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Not sure, it’s a Unitek Y-105 USB to serial cable. I’ll check and see, as that would make most sense that the cable had a problem


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#274916 - 2018-04-08 08:32 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2004-08-07
Posts: 7,420
Ian Offline
President of the Imperial Galactic Government
Ian Offline
President of the Imperial Galactic Government

Registered: 2004-08-07
Posts: 7,420
Loc: Surrey, England, UK
No mention in the spec that it has (rare feature) integrated null modem (crossover) capabilities so suspect that you need an additional 'null modem' cable to internally crossover tx/rx.


Meridian owner since 1992
DSP5000 96/24, MC200, Prime & PSU, Focal Elear, Explorer 1 & 2, F80, 200/203 and various Sonos.
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#274969 - 2018-04-09 14:58 Re: G68 switching on & off? [Re: Ian]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Cool - thanks!

Do I just need a null modem cable, or do I need another USB to RS232 cable? (Sorry newbie with all this stuff.)

Would one of these be ok?

Maybe this VIDEK ONE?


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#274987 - 2018-04-09 22:45 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2008-05-23
Posts: 7,648
Carl Offline
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Posts: 7,648
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Just adding a NULL modem cable into the chain should be fine.

Can never be 100% certain but that VIDEK one should do the job.

Regards,
Carl


861v6+ID40, HD621, 8000.2, 7200HC, 7200, SKYQ Silver, PS3, PDP-LX6090, QNAP TS870-Pro (8*6TB), Roon, iPadAir2.
[In Reserve] C15, MD600 (2*3TB), TwinStore RM (2*2TB)
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#274993 - 2018-04-10 04:28 Re: G68 switching on & off? [Re: Carl]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Registered: 2015-03-16
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Loc: Hong Kong / UK
Excellent, thanks Carl. I'll get a couple ordered & hope for the best!

Thank you,

Nick


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
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#275084 - 2018-04-12 12:22 Re: G68 switching on & off? [Re: Laserblues2]
Registered: 2015-03-16
Posts: 67
Laserblues2 Online content
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Registered: 2015-03-16
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Loc: Hong Kong / UK
It worked!! Very easy - thank you so much for the advice

Thanks,

Nick


Newbie learning
G55 / G68 XXV / HD621 / Oppo 105D / MacBook running Roon
Edited by Laserblues2; 2018-04-12 21:50.
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