Question about Mitsubishi Power Adapter for DiamondPoint V50 Monitor

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No power Mistubishi LCD monitor V91

The LCD monitor Mistubishi V91 Does not turn ON I opened up and hooked up with DMM then applied power and the 5V & 17V reaches to 75% and goes to 15% and it repeat consistant, Even I unplug the connector from power supply to control/ processor board. I checked every component in power supply but i found nothing is looks failed maybe component fails under load. Power supply uses FET chopper. Anyone please suggest, Appreciated.

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Open lcd 17 power supply 5volte ok 13 dimming


Hello.
First of all you need some electronic repair experiance,
You have to disconect all f the power supply that going on 5v(rgb processor in moust cases)and 13v in most cases ccfl inverter(back lite ) with his driver.than have to mesure the voltages.
-Replace the capatitors in 13v line.
if the problem persist try to replace the diode one for 13v with one for 5v,they should be the same type.and check the voltage 5v and 13v.
if the problem is still on 13v look for the problem on the 13v line.

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Hi there,
I had the same problem with the exact same model of Gateway 19" LCD. Likely this is the same issue you're experiencing, and I hope you're able enough with a multi-meter and soldering iron to fix this issue, or willing enough to tear this thing down to its components and at least try to fix it.... otherwise you have a fancy dead-weight object on your hands/desk.

In my case, the 5V power was fried so I actually inserted a 5V 2A power supply inside the monitor housing and soldered the +5V and GND leads to the marked connector pins that connect the power board(larger) to the vga signal board(much smaller). I stripped the guts from the 5V power supply so it would fit easier, and then stole power from the 120v monitor input and directly wired that to the wires that were hooked to the 120v power supply prongs(after removing those prongs as well). The monitor looks and functions as if it were brand new, there's nothing extra hanging out and no bulges anywhere. It works excellent.

Aside from my more-so hackful approach, here's some links and quotes, from other sites, from people who know what components to replace on the power board and still achieve a well-working end result.

From: http://www.topix.com/forum/tech/TNTK13PFRQURRRJJC/p4
Sure-power wrote:
I repair the Gateway FPD1960, FPD1975W and FPD2185W monitors. You can contact me at sure-power@nc.rr.com if interested. If you can remove the power/inverter board it will save $$ on shipping costs. I have sucessfully repaired hundreds of these monitors. From: http://gatewaymonitors.blogspot.com/2007/09/gateway-monitor-recall.html
Russ said... Thank you Michael & Germel & everyone else for your help. I replaced the 5 470microfarad and 4 220microfarad caps on the FPD1960 and it works again. If your in the Metro Detroit area I can perform this repair for $60 onsite.

(insertabovename)@gmail.com
June 19, 2008 10:57 AM icon_delete13.gif b16-rounded.gif Russ said... russix

at

G Mail

Dot

Com

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1 Answer

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plain white screen means loose conecting the lvds cable to panel. reconect it.
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1 Answer

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Need to open up and check to see if do have 5v and 12v in the power supply, check for bad caps also. See example of failed monitors here: http://s807.photobucket.com/home/budm/allalbums

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1 Answer

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Open it up and chaeck to see if you do have 5v and 12v in the power supply, check to see if you get the 12v all the way to the inverter circuits, also look for bad caps, see examples here: http://s807.photobucket.com/home/budm/allalbums

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1 Answer

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Here is a pin connection specification for the ac power supply (dual voltage adaptor)
>socket/plug for a Compaq TFT450 LCD Monitor that she
>supplied (edited for further clarity).
>
>The pins of the male connector (a PS2 mouse type connector) should be connected like this:
>
>
>
> 1 2
>
> 3 I 4
>
> 5 ^ 6
>
>
>
> GND GND
>
> 5V I 12V
>
> 5V ^ 12V
>
>
>
>For clarification - the male will be the end of your cable, and not the socket on the monitor.
>The I is the central polarising bar of the connector, and the ^ is the notch.

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1 Answer

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www.ikenfixit.com

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1 Answer

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