Re: Power Supply PSM217-404-H-R (HG281D, HSG1040, VX2835WM) doesn't wake up
Hi,
I get some fluctuating mV at Q502 and Q502, thats all.
I am concerned about Q601, because voltage drops from ~20V to 1V after powering on.
Regards
badcapass
Member
Last Activity: 07-23-2013, 09:38 AM
Joined: 04-30-2013
Location: Saxonia
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Re: Power Supply PSM217-404-H-R (HG281D, HSG1040, VX2835WM) doesn't wake up
Hi,
dead in the meaning of no voltage (just some fluctuating mV). They actually look better then Q602. If they would be blown up at least I had something to start with.
Are there any check points on the board? (Uhh, I realy thought they spent some effort for fixing this easier...)
RegardsLeave a comment:
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Power Supply PSM217-404-H-R (HG281D, HSG1040, VX2835WM) doesn't wake up
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Hi,
I have problems with a already totally recaped PSM217-404-H-R used in HG281D, HSG1040, VX2835WM, ... Since the rest of the TFT runs fine (with another power supply), the power supply doesn't wake up from standby, there is no voltage on the secondary side (just stand by 'SB+5V'). Even if the monitor is connected to main board and power button pressed, neither standby SB+5V is direct wired to power switch on 'PSON'. Just voltage on main cap (C3 150muF/420V) drops from 320 to 318 volts. TFT reacts on power button, but the blue LED is just blinking or went off.... -
Re: viewsonic vx2835wm no power
Hi,
just replaced the power supply, since my other HG281D shows a picture with lots of stripes and shadows (getting hot here). So I took the power supply an put it in my "new" still not working one. The fixed main board and all the rest works like a charme! Right colors, clear picture, no dead pixel. Now it's time to recap the next main board and getting the power supply fixed or replaced. If both would have the same power supply, it would be a lot easier... I will buy another one on ebay, since shipping for the power supply...Leave a comment:
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Re: viewsonic vx2835wm no power
Edit: blue LED is still alive, just the cable was unplugged...Leave a comment:
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Re: viewsonic vx2835wm no power
Hi,
replaced almost all caps on the main board, wasn't funny...
What I did:
[CODE]Nr. [muF] [V] done
C8 10 16 -
C13 10 16 -
C14 10 16 -
C18 10 50 x
C19 10 16 x
C60 10 16 x
C61 10 16 x
C63 - - -
C69 100 16 x
C74 10 10 x
C77 10 16 x
C80 100 16 x
C83 100 16 x
C92 10 16 x
C94 100 16 x
C97 100 16 x
C98 470 16 x
C99 470 16 x
C103 470 16 x
C119 10 16 -
C120 10 16 -[/CODE]...Leave a comment:
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Re: viewsonic vx2835wm no power
I have to make an addition. Just tried to start up my PSM217 by putting SB5V on PSON, no reaction voltage on +12V or +24V, just a slightly droped votage on main cap C3. Measured voltage on Q601, there it is :
.........|xxxxx|-- 1
.. i - -|Q601|-- 2
.........|xxxxx|-- 3
I get between i/1~20V, i/2~0V, i/3~20V, 1/2~0V, 2/1~20V, 2/3~20V is that correct?
Regards
PaulLeave a comment:
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Re: viewsonic vx2835wm no power
Hi,
just replaced C205, but nothing changed. I ordered the caps for the main board to and since the blue LED doesn't react anymore I want to recap the mb as well. But as you know, I am not sure about the right dimension. They should fit, but...
Nr. [muF] [V]
C8 10 16
C13 10 16
C14 10 16
C18 10 16
C19 10 16
C60 10 16
C61 10 16
C63 - -
C69 100 16
C74 10 16
C77 10 16
C80 100 16
C83 100 16
C92 10 16
C94 100 16
C97...Last edited by badcapass; 07-04-2013, 09:33 AM.Leave a comment:
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Re: viewsonic vx2835wm no power
Hi,
thanks for the input, that are the same values I have read across the net. I measured a voltage at main cap (C3) of 320V. Ordered the missing caps today, waiting to replace the last wrong part (C205 1muF). Hopefully it will change the situation.
Regards
PaulLeave a comment:
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Re: viewsonic vx2835wm no power
Hi,
yes thats right. I got the TFT with replaced caps, but it neither starts. So I took the power supply from another HG281D and it works! Put back the PSM217 and the Problems were back to. That is the reason why I wrote in this thread for the PSM217, also knowing it's ViewSonic related. Either at the Moment I havn't the caps for the main board. So first I want to concentrate on fixing the power supply.
Regards
PaulLeave a comment:
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Re: viewsonic vx2835wm no power
Hi,
after reading some more, I changed C111 to 22muF and C505 to 1000muF. C205 I replaced with 2.2muF, because I have no with 1muF in Stock. So far so god, it's not working at all, but the blue LED doesn't come up anymore... :-( Main Cap is on 318V, 5VSB is on 4.99V, PS_ON between 0.02 and 1.2V, there are 3.3V at power buton. Could the C205 make such a differents? Is C108 10 or 22muF? Any hints, any spots to measure? It has to be the powersupply!
Regards
PaulLeave a comment:
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Re: viewsonic vx2835wm no power
Hi Lumberjack777,
yes the power supply is from a HG281D. All caps are already replaced with Matsushita (Panasonic) 105°C LowESR types, seems you use the same, thanks for the pic. Just the two 400V are original, I tested them and they are ok. But maybe you can help me with the right sizes. I got the power supply with replaced caps and didn't check them, because I couldn't get a schematic for the board.
Input
C3 150muF/400V main cap (ori)
C203 2.2muF/50V
!C205 10muF/50V !1muF/50V
Middle...Last edited by badcapass; 06-30-2013, 04:49 AM. Reason: Got a list with size of caps here http://s14.directupload.net/file/u/40674/29fvxoqk_jpg.htm differing values marked with !Leave a comment:
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Re: viewsonic vx2835wm no power
Hi,
connected it to a video signal, PSON fluctuate between 0.01V and 0.9V. When blue LED went off, there is a short peak (0.9V) at PSON, the voltage at power button drops.
Seems like monitor do not wake up from stand by, but with another power supply it will... Are there other Points I can check voltage? By the way, voltage an main cap is today ~ 325V. I have read voltage at main cap is 340V?
Many thanks for your efforts, regards
PaulLeave a comment:
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Re: viewsonic vx2835wm no power
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I thought the main board is ok, because if I replace the power supply with a compatible FSP217 (from another HG281D) it works. But when standby has 5V why there is no PS_ON? I think I get it. But why the blue LED reacts then and why ist goes in standby (blinking) after a while (think at the time where it shows the ‘no signal' screen). Oh, I didn't mention, there is no input connected while testing.
Back to the main board. On the main board three caps are already replaced with 105°C Matsushita (Panasonic), C18 (10muF/50V),...Leave a comment:
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Re: viewsonic vx2835wm no power
Hi,
thanks for your help. I soldered all back together and measured the given points. PSON is always 0, but blue LED react on power button... Voltage on main cap is 320V, after blue LED is on it drops to 319V, voltage is constant.
Pics will follow.
Thanks and regards,
PaulLeave a comment:
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Re: viewsonic vx2835wm no power
Hi,
same sort of Problem here with HD281D and PSM217, but there is no voltage on the Output rails, just 5V stand by (~5V, blue LED is on, react on power button, screen works with another power supply). All recapped, but the 400V parts (150muF and 22muF). Checked main capacitor (150muF), round 320V, soldered it out, 140muF, is that ok? Same on the 22muF cap, measured 20muF, both looking good.
Any idea why it stays in standby?
Regards
PaulLeave a comment:
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