Re: Dead but clicking Hanns-G HC194D?
Just curious can the 7812 be tested in place? like could I supply 12v from a battery to the input and see what I get out? The thought just occurred since I have a motorcycle battery charging right next to it on my work area. Obviously I am getting further from abilities in trying to trace back further on the board to see what could be causing the 6.3v on the 12v.
Mafi
Member
Last Activity: 01-15-2022, 02:30 PM
Joined: 09-26-2021
Location: Minneapolis MN
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Re: Dead but clicking Hanns-G HC194D?
I just checked the IC53 and seem to get input of 7.6V in with 6.2V out. Hopefully that helps a bit. I am guessing that means I am not getting the proper voltage since that regulator is supposed to be 12v out.Leave a comment:
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Re: Dead but clicking Hanns-G HC194D?
Thanks for replying. Capleaker, I have been just plugging the PS board in by itself and those are the readings I am getting. Is there something I am missing? I am just reading CN101. I see there is a marking that says On/Off as well as one that says ADJ. I have no idea how this works.
RJ, IC53 is a KIA7812A which seems to be a 3 terminal voltage regulator.Leave a comment:
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Re: Dead but clicking Hanns-G HC194D?
Hello?? Anyone?? I now have a board pulled apart with caps replaced and jumpers disconnected and I have made no progress. Can anyone chime in as to what to do next?Leave a comment:
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Re: Dead but clicking Hanns-G HC194D?
RJ, Thanks for replying. I replaced C5, C8, C10, C57, C59, C62. [At some point a while back (years) I had replaced C51, C52, C54, C56, C101, C102.] So at this point there are no original electrolytic caps on the board. I was still getting the ~6.43v on the 12v side at the CN101 connector. It currently has jumpers WJ11,12,13,14 disconnected to remove the Inverter section as suggested by Momaka in post #7 but it had no effect. That's why I am stuck. So I open to any suggestions.Leave a comment:
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Re: Dead but clicking Hanns-G HC194D?
Hello? Is there anyone out there that can help me zero in on my issue? We've ruled out a few things but now that I am deeper into it I could really use some help...Leave a comment:
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Re: Dead but clicking Hanns-G HC194D?
Ok I desoldered the one side of the four jumpers mentioned and I am still getting the same results. The only thing I can add is that I had my test leads clipped onto the output pins for the 12v and ground and as I plugged it in I noticed the voltage on my meter first flashed ~10 and then quickly worked its way down to about 6.43V. It was still 4.99 on the 5V pin. Sorry life got in the way a bit so it took a bit to get it done. Where to next?Leave a comment:
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Re: Dead but clicking Hanns-G HC194D?
Sorry I should have clarified. I had the PS board by itself when I plugged it in. It was not connected to anything when I took the voltage readings on the connectors. I will desolder one side of each of the 4 jumpers and see what I get. Yes it does have built in speakers but since it wasn't connected that should rule out the video/logic board right? Thanks again for all the guidance.Leave a comment:
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Re: Dead but clicking Hanns-G HC194D?
Well, I just got my 6 caps and soldered them in. I even replaced the large one. I plugged in the board and I could hear the ticking still and when I checked the output connections I am getting 6.21-6.25 on the 12v pins and 4.98 on the 5v pins. so nothing really different. I did not put it all together yet. I thought I would see if you had any more input. I was able to isolate the ticking sound though it seems to be coming from the transformer. Any thoughts?Leave a comment:
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Re: Dead but clicking Hanns-G HC194D?
Thanks for replying. I think it may be a result of my terrible pictures but I will go after them first and see where I stand. They didn't seem to be bulging to me, or at least not near as bad as the ones I have seen in the past. I will let you know after I get them replaced. I was afraid it was something more like bad transformer or a diodes and was figuring I could get all of the parts in one order. Would you recommend that I replace the big 100uf 400v one as well since I have it apart?
-AdrianLeave a comment:
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Dead but clicking Hanns-G HC194D?
Please be patient with me this is my first post.
A little Background on this. I had been having issues with this monitor waking up from sleep mode. I have two of these side by side. One was HDMI and the other DVI connected. Recently this HDMI one would wake and it would keep trying various resolutions blinking on and off before finally coming back on. I discovered if I shut it off and back on it would usually lock in and work fine right away. This was for several weeks. I came home to have it not come on but I could hear a ticking sound from inside and it wouldn't come wake up.... -
Re: New Members - please post your introductions here
Hello. My name is Adrian. I live in Minneapolis Minnesota USA.
I tinker on everything that comes along. Mostly because I am curious but also because I am cheap, poor, and hate waste. I wish I had a nice technical background but I don't. I just try and learn what I can as I go. I'm looking forward to a few adventures here.Leave a comment:
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