Re: ICE3B0365J Troubleshooting (W200 Sub)
An oscilloscope and a bench PSU are the 2 things I don't have, though the latter is planned as soon as I have some spare cash. I have seen some reasonably priced secondhand scopes but right now I wouldn't know how to use one anyway lol
SFB
Member
Last Activity: 12-05-2023, 08:25 AM
Joined: 03-14-2023
Location: Nottingham
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Re: ICE3B0365J Troubleshooting (W200 Sub)
Jeez...no wonder it was being intermittent and everything else checked fine then. Definitely something I'm going to keep in mind for future though if the issue is being elusive. He has taken it now and it hadn't faltered in over 24 hours. I did notice residue on the back plate during that last clean so hoping whatever it was I either got or just burned off with the heat. I have learned a lot though, and thanks again for your help and advice with this, it is very much appreciated. Suppose it is back to my sub now then and try and figure that...Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
I think I've got it. Before getting a bench PSU and forcing it I decided to take the last bridge off as it was working better prior to no avail, then went round and reflowed every single connection (some bubbled) before doing a meticulous clean with alcohol and qtips. Worked straight away but after an hour it stuttered and noticed some molten flux had seeped out of somewhere, so cleaned that and now it has been solid for 19 hours inside the unit. Just cleaned up a few more bits of liquid flux and still solid. Would have liked to say it was...Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
Fair point. I'm assuming to force it to stay on I'd need to inject the 15V on the VCC connection, or the expected voltages on the pins for the amp board. Would mean I need to get myself a desktop PSU...a thermal camera would be helpful too, but no way I can afford one of those at present hahaLeave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
That would blow something though wouldn't it? It is obviously tripping because it is detecting an issue.
I can't even get it to come on again now...I don't understand how laying a bit of wire to re-enforce a tracer, desoldering-checking-resoldering, reflowing connections, just taking measurements or even having the board outside/inside can completely change it's behaviour. So far I have had it working, static red light, slow flashing red light, fast flashing red light or nothing at all, and completely random combinations of...Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
Yeah, starting to get on my nerves a bit now haha
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Re: ICE3B0365J Troubleshooting (W200 Sub)
It's gone again, but only once I had put it back inside for half an hour...it has got to be a heat issue....going to heat and freeze stuff tomorrow.Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
I had actually resoldered from that point up to the pin when I did the rest recently as I had noticed the broken bit, but with you mentioning it I decided to run wire down and it seems to have done it. Been on over an hour and cannot get it to turn red or flash. Not counting my chickens yet and going to mess with it more, but tentatively hopeful...Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
I did have a look at it but didn't see anything obvious - it is all SMD (pictures attached - Ignore the yellow and orange wires as they are just extending the LED cable as it is only just long enough to connect when the case is closed)
Measured voltages on the 102 cap in the bootstrap on the 51ohm - When it works 188V, when it does a false start and stays constant red (he said it has always done this at times and he needed to restart) 162V, and when it is flashing red a pulsing reading from 158-240V. It is working more than...Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
Yeah, that is obviously why it has been so difficult to diagnose. I tried monitoring readings but once it goes all voltages on the board are effected so it's impossible to narrow it down. I left it on for an hour after the last post and it was fine. Off/on and red light flashing again but in a weird random morse-code like pattern which was new, flicked a few switches and came back on again. On/off again a bunch of times and was fine every time, so left it on for another half hour and occasionally it cut out and flashed red briefly but on...Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
Scratch that, I left it alone for an hour and it suddenly started working again...the behavior of this board has me baffled.
Just left it with the volume up full (low input so as to not annoy the neighbours), after a few minutes it cut out went to flashing and then kicked back in again after a few seconds...going to leave it running and monitor it.Last edited by SFB; 07-26-2023, 12:41 PM.Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
Right, resistor replaced but now I can't get it working at all, just blinking red light. I replaced a carbon resistor with metal, will that make a difference? Voltages on the startup and around the IC are jumping all over the place again. Whether I have the second board connected or not the only stable voltage on the board is the main DC up to the starter transformer.Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
Will follow up on this once I have replaced that resistor, hopefully tomorrow.
Before I got it working the whole of the secondary side was dead, and no idea what I did to get it working - I had just removed, tested, and resoldered a few parts. That D2 tested fine as did every other component in that area including the transformer, actually running out of things to test on that side of the board so was planning to just go systematically through the remaining parts just to rule them out. The fact the corroded leg of that resistor...Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
One of the 10kOhm resistors near that 5W had corrosion on a leg but tested okay - just took it out to check and the leg snapped so need to order a replacement for that before I can do anything else now.Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
Oh yeah, but seeing as heat seems to be what is causing the issue and with a 7W being the original component and having a 5W in now I am just wondering how much of an effect the extra heat dissipation will have. Grasping at straws really.Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
This will sound like a noob question but I have a bunch of these 5W resistors - before ordering a bigger one could I run 2 in series in parallel with 2 others in series for 51ohm 20W just to test that this is the issue?Last edited by SFB; 07-25-2023, 06:16 AM.Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
So having a 5W in there is not going to be doing it any favours is it?
Will order a 7W and see if that helps. Kinda wish I had infrared goggles so could see if the heat is just focused around there. Not really used freezer spray before so don't feel spraying it on a live 330V circuit is the best idea.Last edited by SFB; 07-25-2023, 05:31 AM.Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
Will do. I think it is looking quite possible it is the cause especially if the wrong part is in there - I know it gets very hot anyway due to pictures of other boards....Leave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
Actually, am I right in thinking that is a 7W wire wound? And there is a 5W in it...urghLeave a comment:
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Re: ICE3B0365J Troubleshooting (W200 Sub)
Ahh, that might be it. The pictures sent over (attached) looked like a wire wound so that is what I told him to get. It supposed to be a metal oxide then?
Would that cause the behaviour I'm getting then?
I was thinking about getting a higher wattage one anyway with the amount of heat and the fact the old one had crumbled, so a 51ohm 7W metal oxide?
Much appreciated...Leave a comment:
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