PSU eval. # n3252w View Sonic, Model vs11335-1m
in [Repair]
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From: ctops.legal on 1 May 2010 13:25 This PSU looks new, being there is no service manual to d/l that I can access (other than the scam sites), the power light comes on after hard reset then blinks green, bad PSU right ?, well looking at the main board (2006) the general continuity testing turns out ok, the specs are as follows: PSU outputs: 12 pin output to main board, and 10 pin output to video. PSU has no part# that corresponds to any posts here or in Google groups, I can clearly see the scratch marks where the PSU has been replaced and/or looked at by the face plate, I dont want to purchase an replacement PSU to find out its some other problem thats not feasible within the clients budget to find I cant return the PSU for a refund. Any suggestions would be appreciated, also I suspect a problem with the inverter based on the power on response which is very similar to a PSU failure. Description, press power LCD try to start then goes off and the green power light blinks green. Please email me directly I will compliment my findings to this forum. Curt PSU--> http://img100.imageshack.us/i/dscn0178q.jpg/
From: Grant on 1 May 2010 16:59 On Sat, 1 May 2010 10:25:34 -0700 (PDT), "ctops.legal" <ctops.legal(a)gmail.com> wrote: >This PSU looks new, being there is no service manual to d/l that I can >access (other than the scam sites), the power light comes on after >hard reset then blinks green, bad PSU right ?, well looking at the >main board (2006) the general continuity testing turns out ok, the >specs are as follows: >PSU outputs: 12 pin output to main board, and 10 pin output to video. >PSU has no part# that corresponds to any posts here or in Google >groups, I can clearly see the scratch marks where the PSU has been >replaced and/or looked at by the face plate, I don't want to purchase >an replacement PSU to find out it's some other problem that's not >feasible within the client's budget to find I can't return the PSU for >a refund. >Any suggestions would be appreciated, also I suspect a problem with >the inverter based on the “power on response” which is very similar to >a PSU failure. >Description, press power LCD try to start then goes off and the green >power light blinks green. I recently rescued a faulty LCD with similar problem, would turn off after very short time. Symptoms like bad caps in power supply, except this monitor ran off an external 12V power brick and nothing looked busted around the power board. After much searching I found info on a Russian site which suggested changing the capacitor across backlight inverter xformer primary as it had lost capacitance. So I replaced both caps (dual inverter board for four CCFL tubes) and the thing worked! Replaced 2 x dark red 220nF 250V with 220nF 630VDC or 275VAC polycarbonate mains rated cap. Had to mount the caps off-board as they were much larger than the originals, but there was plenty of horizontal space around the inverter board. What started out looking like a power supply problem was in fact over on the backlight inverter board. Worth a try? Grant. -- http://bugs.id.au/
From: ctops.legal on 2 May 2010 09:56 On May 1, 4:59 pm, Grant <o...(a)grrr.id.au> wrote: > On Sat, 1 May 2010 10:25:34 -0700 (PDT), "ctops.legal" <ctops.le...(a)gmail..com> wrote: > >This PSU looks new, being there is no service manual to d/l that I can > >access (other than the scam sites), the power light comes on after > >hard reset then blinks green, bad PSU right ?, well looking at the > >main board (2006) the general continuity testing turns out ok, the > >specs are as follows: > >PSU outputs: 12 pin output to main board, and 10 pin output to video. > >PSU has no part# that corresponds to any posts here or in Google > >groups, I can clearly see the scratch marks where the PSU has been > >replaced and/or looked at by the face plate, I dont want to purchase > >an replacement PSU to find out its some other problem thats not > >feasible within the clients budget to find I cant return the PSU for > >a refund. > >Any suggestions would be appreciated, also I suspect a problem with > >the inverter based on the power on response which is very similar to > >a PSU failure. > >Description, press power LCD try to start then goes off and the green > >power light blinks green. > > I recently rescued a faulty LCD with similar problem, would turn off > after very short time. Symptoms like bad caps in power supply, except > this monitor ran off an external 12V power brick and nothing looked > busted around the power board. > > After much searching I found info on a Russian site which suggested > changing the capacitor across backlight inverter xformer primary as > it had lost capacitance. So I replaced both caps (dual inverter > board for four CCFL tubes) and the thing worked! > > Replaced 2 x dark red 220nF 250V with 220nF 630VDC or 275VAC polycarbonate > mains rated cap. Had to mount the caps off-board as they were much larger > than the originals, but there was plenty of horizontal space around the > inverter board. > > What started out looking like a power supply problem was in fact over > on the backlight inverter board. > > Worth a try? > > Grant. > --http://bugs.id.au/- Hide quoted text - > > - Show quoted text - Well the unit wont come on (just a flash of blue), then blinking green light. I know the client will pay for a PSU I just need to id this one, the unit was sold in 2007 from what I am reading about this PSU from this particular model there must have been a bad batch of PSUs, and the replacement needs a modified cable, and some people are using the unit with an external PSU. I this trying a new PSU 1st will eliminate the need to take the unit apart any further, thanks for the input.
From: ctops.legal on 3 May 2010 08:41 On May 2, 9:56 am, "ctops.legal" <ctops.le...(a)gmail.com> wrote: > On May 1, 4:59 pm, Grant <o...(a)grrr.id.au> wrote: > > > > > > > On Sat, 1 May 2010 10:25:34 -0700 (PDT), "ctops.legal" <ctops.le...(a)gmail.com> wrote: > > >This PSU looks new, being there is no service manual to d/l that I can > > >access (other than the scam sites), the power light comes on after > > >hard reset then blinks green, bad PSU right ?, well looking at the > > >main board (2006) the general continuity testing turns out ok, the > > >specs are as follows: > > >PSU outputs: 12 pin output to main board, and 10 pin output to video. > > >PSU has no part# that corresponds to any posts here or in Google > > >groups, I can clearly see the scratch marks where the PSU has been > > >replaced and/or looked at by the face plate, I dont want to purchase > > >an replacement PSU to find out its some other problem thats not > > >feasible within the clients budget to find I cant return the PSU for > > >a refund. > > >Any suggestions would be appreciated, also I suspect a problem with > > >the inverter based on the power on response which is very similar to > > >a PSU failure. > > >Description, press power LCD try to start then goes off and the green > > >power light blinks green. > > > I recently rescued a faulty LCD with similar problem, would turn off > > after very short time. Symptoms like bad caps in power supply, except > > this monitor ran off an external 12V power brick and nothing looked > > busted around the power board. > > > After much searching I found info on a Russian site which suggested > > changing the capacitor across backlight inverter xformer primary as > > it had lost capacitance. So I replaced both caps (dual inverter > > board for four CCFL tubes) and the thing worked! > > > Replaced 2 x dark red 220nF 250V with 220nF 630VDC or 275VAC polycarbonate > > mains rated cap. Had to mount the caps off-board as they were much larger > > than the originals, but there was plenty of horizontal space around the > > inverter board. > > > What started out looking like a power supply problem was in fact over > > on the backlight inverter board. > > > Worth a try? > > > Grant. > > --http://bugs.id.au/-Hide quoted text - > > > - Show quoted text - > > Well the unit wont come on (just a flash of blue), then blinking > green light. I know the client will pay for a PSU I just need to id > this one, the unit was sold in 2007 from what I am reading about this > PSU from this particular model there must have been a bad batch of > PSUs, and the replacement needs a modified cable, and some people are > using the unit with an external PSU. I this trying a new PSU 1st will > eliminate the need to take the unit apart any further, thanks for the > input.- Hide quoted text - > > - Show quoted text - The PSU looks like a 2200232015p Rev. 1 A google searched turned up 2 (out of stock), the Unit was sold in 2007, any idea where to find a new PSU ?
From: ctops.legal on 4 May 2010 12:14 On May 3, 8:41 am, "ctops.legal" <ctops.le...(a)gmail.com> wrote: > On May 2, 9:56 am, "ctops.legal" <ctops.le...(a)gmail.com> wrote: > > > > > > > On May 1, 4:59 pm, Grant <o...(a)grrr.id.au> wrote: > > > > On Sat, 1 May 2010 10:25:34 -0700 (PDT), "ctops.legal" <ctops.le...(a)gmail.com> wrote: > > > >This PSU looks new, being there is no service manual to d/l that I can > > > >access (other than the scam sites), the power light comes on after > > > >hard reset then blinks green, bad PSU right ?, well looking at the > > > >main board (2006) the general continuity testing turns out ok, the > > > >specs are as follows: > > > >PSU outputs: 12 pin output to main board, and 10 pin output to video.. > > > >PSU has no part# that corresponds to any posts here or in Google > > > >groups, I can clearly see the scratch marks where the PSU has been > > > >replaced and/or looked at by the face plate, I dont want to purchase > > > >an replacement PSU to find out its some other problem thats not > > > >feasible within the clients budget to find I cant return the PSU for > > > >a refund. > > > >Any suggestions would be appreciated, also I suspect a problem with > > > >the inverter based on the power on response which is very similar to > > > >a PSU failure. > > > >Description, press power LCD try to start then goes off and the green > > > >power light blinks green. > > > > I recently rescued a faulty LCD with similar problem, would turn off > > > after very short time. Symptoms like bad caps in power supply, except > > > this monitor ran off an external 12V power brick and nothing looked > > > busted around the power board. > > > > After much searching I found info on a Russian site which suggested > > > changing the capacitor across backlight inverter xformer primary as > > > it had lost capacitance. So I replaced both caps (dual inverter > > > board for four CCFL tubes) and the thing worked! > > > > Replaced 2 x dark red 220nF 250V with 220nF 630VDC or 275VAC polycarbonate > > > mains rated cap. Had to mount the caps off-board as they were much larger > > > than the originals, but there was plenty of horizontal space around the > > > inverter board. > > > > What started out looking like a power supply problem was in fact over > > > on the backlight inverter board. > > > > Worth a try? > > > > Grant. > > > --http://bugs.id.au/-Hidequoted text - > > > > - Show quoted text - > > > Well the unit wont come on (just a flash of blue), then blinking > > green light. I know the client will pay for a PSU I just need to id > > this one, the unit was sold in 2007 from what I am reading about this > > PSU from this particular model there must have been a bad batch of > > PSUs, and the replacement needs a modified cable, and some people are > > using the unit with an external PSU. I this trying a new PSU 1st will > > eliminate the need to take the unit apart any further, thanks for the > > input.- Hide quoted text - > > > - Show quoted text - > > The PSU looks like a 2200232015p Rev. 1 > > A google searched turned up 2 (out of stock), the Unit was sold in > 2007, any idea where to find a new PSU ?- Hide quoted text - > > - Show quoted text - View Sonic ftp acces to service manuals; ftp://supportdocs.viewsonic.com/Documents username: custaccess password: Vssm22338
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