Question about ViewSonic VX924 19" LCD Monitor

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ViewSonic VX924 transistor

Hi there -

I have the same problem with my monitor as you described - the transistors q6 and q7 and the inverter board are blown. However, the codes I see on the transistors are different from what you described - mine are DK QP, with the DK on top. I am having trouble figure out what they are and I'm wondering if you were ever able to fix your monitor. I am sure if I could get replacements it would fix the problem. If any of this rings a bell (or possibly is helpful, as far as identifying the busted components) please let me know!

cheers,
Brandon

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What are the value or genaric names of q6 and q7.

Posted on Apr 19, 2010

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Hey Brandon.
Besides those transistors, you may also fine the large capacitor adjacent to the transformer gone too, Possibly the transformer may be bad too ?
Also the 924s used at least two style boards.

Posted on Sep 12, 2008

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bammbammfran
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SOURCE: viewsonic vx924 power/inverter board

See ebay item 390074135923
http://cgi.ebay.com/2-Inverter-transistor-viewsonic-VX910-VX924-DK-QB-QO-QA_W0QQitemZ390074135923
Fran

Posted on Jul 27, 2009

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1 Answer

Viewsonic VX924 monitor SMPS failed. Replaced all bad capacitors and have found that one pair of inverter driver transistors has failed. They are marked as DKQR (They are apparently Rohm 2SC4672...


When the DC filter caps no longer filter out high frequency AC, that AC will be fed through out the circuits and cause damages such as the inverter frequency will be running at the wrong frequency and caused overheating.
The service manual does not show the sch of the power supply/inverter board because it is not designed by Viewsonic.
http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VX924/

Mar 27, 2011 | ViewSonic VX924 19" LCD Monitor

1 Answer

ViewSonic Vx924 No power


Hello,

If youcan take a picture or two of the boards in your system as close and clear as you can and go to our web page and email them to me I will check and see if we can help you find the problem.

Buddy
Corporate Computer
www.ccl-la.com

Aug 14, 2009 | ViewSonic VX924 19" LCD Monitor

2 Answers

Viewsonic vx924 power/inverter board


See ebay item 390074135923
http://cgi.ebay.com/2-Inverter-transistor-viewsonic-VX910-VX924-DK-QB-QO-QA_W0QQitemZ390074135923
Fran

Jul 23, 2009 | ViewSonic VX924 19" LCD Monitor

1 Answer

No picture on monitor


The Q7 has a tendency to burn up transistors and a high voltage capacitor on the one half of the inverter board which is part of the power board.
I have repaired 1/2 dozen of these with that problem.
Only way to tell for sure would be to open it up and look at it.
If you can do that and send me a picture to bammbamm@ptd.net, I may be able to confirm this.
The other possible problem could be a bad bulb, but since it is fairly new ? that is probably not the issue.
Fran

Jul 20, 2009 | ViewSonic Optiquest Q7b Flat panel TFT 17"...

1 Answer

Help in identifying this transistor for my VX924


Are they black with 3 SMD pads? They should have a tiny tiny number on the top corresponding to a SMD code that will tell you what they are (example: D9A means 5.5V zener diode).

http://www.tkb-4u.com/code/smdcode/indexsmdcode.php

You should be able to just get a new inverter or repurpose an inverter out of something else to get it working again. An inverter that powers any other CCFL bulb should work fine.

Mar 16, 2008 | ViewSonic VX924 19" LCD Monitor

1 Answer

Viewsonic lcd problem


This is a generic symptom that could happen to any LCD monitor.
The following is a generic answer applicable to most.

The most possible causes are bad capacitors or a bad semi-conductor.

Open the unit and check to see if any of the capacitors in the power supply or other boards look domed or vented on the top.

Replace any capacitors accordingly. Use the same value capacitors. Most often, 1000uF 16V or 25V, 470uF at 16 or 25V, 220uF at 16V or 25V.

If this doesn’t solve the problem, try checking the surface-mount transistors on the inverter board that run the lights. Some times these transistors go bad and can cause the power to cycle up and down. Check the area for any cracked or overheated ceramic or mylar capacitors.

Don’t forget to check for caps on the main board. Some times these boards are overly simple and only have a couple of caps, but other times they are teaming with them.

Jan 06, 2008 | ViewSonic VX924 19" LCD Monitor

1 Answer

Veiwsonic 924x


This is a generic symptom that could happen to any LCD monitor.
The following is a generic answer applicable to most.

The most possible causes are bad capacitors or a bad semi-conductor.

Open the unit and check to see if any of the capacitors in the power supply or other boards look domed or vented on the top.

Replace any capacitors accordingly. Use the same value capacitors. Most often, 1000uF 16V or 25V, 470uF at 16 or 25V, 220uF at 16V or 25V.

If this doesn’t solve the problem, try checking the surface-mount transistors on the inverter board that run the lights. Some times these transistors go bad and can cause the power to cycle up and down. Check the area for any cracked or overheated ceramic or mylar capacitors.

Don’t forget to check for caps on the main board. Some times these boards are overly simple and only have a couple of caps, but other times they are teaming with them.

Dec 27, 2007 | ViewSonic VX924 19" LCD Monitor

2 Answers

I have a problem with my lcd 17"


Unplug the LCD panel from the main board and see if the light stays on. If it does your panel is shorted, if it still blinks you could have a short.

You'll need to check for shorts using an Ohm meter.

First, make sure you've replaced all the capacitors that are 220uf or larger in the power supply and the inverter board of it's separate.

Measure the 5V and the 12V lines to ground. Do they measure shorted? If so, check the diodes and or regulators.

If not, check the inverter board (or the part of the board that runs the lights) to see if the transistors are shorted.

Also, check to see if any of the ceramic or mylar capacitors are cracked or overheated.

Aug 24, 2007 | ViewSonic VX924 19" LCD Monitor

2 Answers

Viewsonic VX910 CCFLamp drivers...


One and a half year later I know the solution :-). It is 2SC4672... sure!. DKQ* is in my Jaeger SMD-Decoder book (10.000 SMD - Demiconductor - Codes)
Common problem with inverter PCB. Caused by the damaged or loose 100nF (or some same value)
Succes. For me it is working.

TVMAN

Aug 09, 2007 | ViewSonic VX910 19" LCD Monitor

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