Re: VP2030b Power Supply Problem
Correction to my previous information ;
The zener diode (ZD4) is connected underneath the pcb between the 0v and the junction between two resistors R7, R8 and an inductor L1 and [U]not[/U] to the -ve of the large 150uF capacitor. Sorry for any confusion.Re: VP2030b Power Supply Problem
Correction to my previous information ;
The zener diode (ZD4) is connected underneath the pcb between the 0v and the junction between two resistors R7, R8 and an inductor L1 and [U]not[/U] to the -ve of the large 150uF capacitor.
chrisuk
Member
Last Activity: 05-01-2022, 03:27 AM
Joined: 10-09-2012
Location: Studley, Warwickshire
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Re: VP2030b Power Supply Problem
OK, I replaced the two capacitors in question with no change. I then removed IC1 and checked the voltage on the relevant pads and this time it was just a few millivolts. And now I think its time to come clean, ....before I found your forum during the initial stages of trying to find the problem I found two damaged diodes one blown apart and the other looked discoloured (I think, - its been a while ago now).
It was a zener diode (ZD4) connected underneath the pcb between the 0v and the negative of the large 150uF capacitor that was...Leave a comment:
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Re: VP2030b Power Supply Problem
The 22uf capacitor hasn't been changed but appears to check out OK on the multimeter (it's reading 22uf across the terminals while in circuit). I am starting to think the NCP1203 might be gone. Should I remove it and check to see if I get the 12.8VDC at the pin 6 tab?Leave a comment:
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Re: VP2030b Power Supply Problem
Here's a pic of the NCP1203 pinout if it helps....Leave a comment:
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Re: VP2030b Power Supply Problem
Looks like you may be right Jetadm123 the pins look right.
Rtech, I've checked the components you mentioned and they all seem OK. I have diode and capacitance functions on my multimeter (Fluke 185) and the capacitors and diodes checked out OK I think. Also I actually powered up the board and measured 3.6VDC betweens pins 4 (ground) & 6 (VCC) according to the NCP1203 pinout. Any help?Leave a comment:
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Re: VP2030b Power Supply Problem
Hi selldoor. I just checked it in situ and I have continuity so I think its OK (unless i need to take it out of circuit)?
I've been trying to find a datasheet for IC1 (DAP08) online but no luck up to now!Leave a comment:
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Re: VP2030b Power Supply Problem
Yes, 330V across the big cap confirmed.Leave a comment:
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Re: VP2030b Power Supply Problem
Hi RTech. I've attached two pics top and bottom as requested. I should point out that I repositioned one of the capacitors when I tried to fit a replacement 400V 150mf capacitor which wouldn't fit in the end so I bought the correct size but left the re-positioned capacitor in its new position. There is also a track repair under the MOSFET area (the other wire link is for the repositioned capacitor. If you could tell me what to check with the board on the bench, I do have test equipment if it helps. Thanks....Leave a comment:
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Re: VP2030b Power Supply Problem
Hi, its been a while (work committments) but I'm back on the case of my broken VP2030b.
I had narrowed the problem down to the power supply and have replaced various components and it no longer blows up when I put power on to it. So far i've replaced the components mentioned in the thread but its still dead when I put the monitor together. I don't really know how to test the power supply but when its powered up on its own I don't seem to have anything past the new
2SK3569 MOSFET. If anyone has any ideas on how I could identify where...Leave a comment:
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Re: VP2030b Power Supply Problem
Thanks Rtech.Leave a comment:
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Re: VP2030b Power Supply Problem
Hi again.
Should have realised I have no idea which thermistor/inrush limiter I should be ordering. Do you have any idea which part would be used in this power supply. I have the data sheet but I don't know what characteristics I need.
Chris S.Leave a comment:
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Re: VP2030b Power Supply Problem
Hi ben7 & Rtech. Wow fast response. Thank you very much. Just shows a little knowledge can be dangerous (on my part). I have been working on this for a few days now and have already replaced a 150mF capacitor and a 2SK3569 MOSFET (and yes the fuse has blown several times while trying it out). I'll order one of these from RS Components and see what happens. Thanks again.
Chris S.Leave a comment:
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VP2030b Power Supply Problem
Hi. Just joined the forum today. Looks like there is a wealth of information here. Can anyone help with the repair I'm trying to make to my VP2030b Power Supply Board type EADP-64BF B. Its blown a capacitor on the mains input side. Its marked up on the board as "NTC1" and is connected across the Neutral (I'm in the UK) and a small inductor. It was covered in a rubberized sleeve and is blown to bits so I can't read what it is. More info is that it is green and about 10mm diameter. I have managed to identify two letters on it "CK" and underneath the "K" was the number...
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