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Question about ViewSonic VX910 19" LCD Monitor

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Viewsonic VX910 CCFLamp drivers...

Hi, I found 2 of my CCFL drivers shorted Q6 & Q7, problem is they are SMD transistors, and they only have 4 letters written on top DK QA. I replaced them with a DK QM I had, it worked for about 24 hours but looks to me they went bad again, I can't find how to read this letters(manufacturer code), on the other hand I think the transformer is probaly shorted too. Where can I find any information on this board, a schematic or a clue on the name of this 2 transistors? Thanks Io.

Posted by Iolo on

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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.


Posted on Feb 27, 2009


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This is not a solution but I am just surprised that you have the EXACT same fault as me. I've done some searching on datasheetcatalog website and apparently the letters DK mean it is a BCX42 PNP Silicon AF and Switching Transistor (For general AF applications High breakdown voltage) however the datasheet for this device is a 3 pin smd not a 4 pin so I'm not sure that it is correct.

Posted on Sep 17, 2007

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Hello Edwin Ortiz---My tv had the red blinking light on the power board and i found a tiny 3amp subminiture fuse listed as F2 on the printed board. It fooled me because it did not look like any fuse i've ever seen. Anyhow the fuse was open and the problem was the two transistor listed as Q6 and Q7 on the power board.The transistors are a brand from fairchild with a part # FQPF9N50CF . They cost $1.60 each and i got them from Mouser Electronics out of texas ( )

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Where is the fuse in a 3701 LCD Polaroid TV/Monitor

In the Polaroid FLH-3701, the fuse is located on the power supply board, next to the AC power connector. It is a small black cylinder. It is labelled F1. Value is 5 amp, 250 volts.
A fuse does not blow for no reason. Most commonly a fuse will fail because of a short someplace on the board. I have this same TV. The fuse blew. The reason was transistor Q6 had shorted. There are two identical paired transistors on the output side. Q6 and Q7. They are both Infineon 11N60C3 MOSFET transistors. Check those for a short. There may be a burnt smell.
More commonly, this TV will fail because of bad capacitors on the power supply board.


Hi, Q7 in the power supply

the pin at one side is the base, et the other side top is colector and bottom emiter, looking the transistor face flat down.


I have a viewsonic VX910 and the picture goes off and on. Picture lasts less than a second. I replaced the 3 caps but no good. I measured some power points on the PSU and see the drop, even the A/C drops...


This could be caused by a few things. First, be sure the capacitors you used are low ESR. You can't use capacitors from Radio Shack, they can damage the electronics. Second, on the bottom of the power supply board you will find 4 transistors, they may be blown out. Check them with a multimeter or transistor checker. If the transistors are blown, we carry them is stock if you need them.
Contact us at: [email protected] if you need any additional help.

I hope this helps, if so please rate our solution.

Corporate Computer


Viewsonic vx924 power/inverter board

See ebay item 390074135923

ViewSonic VX910 monitor has a power supply issue.

Your monitor have a bad condensator in the PSU.

The only thing to do is to replace the Power Supply Unit (very expensive, more than a new monitor) or if you have electronic tools, found and replace that condensator.(cheaper way...)


Have you connected your monitor with a new power cord ?

Best Regards!

ViewSonic VX924 transistor

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.

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).

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.

Viewsonic N3250W won't power on

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I repaired it on June 28th with the lsit of parts above
More deatil information here (of the problem)

List of photos
A) new Power supply on TV 47afd61.jpg
B) new Power supply and new 12 pin connector (plug and play)
C) old board
D) TV picture in HD

LCD monitor problems.


If the monitors use seperate plug in power supply EG 12 to 24volts it could be that at fault.
Or it could be the invertor at fault.
I have had some success repairing invertors if you can use A meter remove invertor Panels & check accross the coils with meter set to ohms all the coils should read identical chances are you will find one set of windings either dead short or open circuit. This will be the faulty coil hopefully as your monitors are all the same make the coils will be the same.
Carefully desolder faulty coil & fit one that reads good from a doner board.
Look for any SMD type fuses & check or replace them & thats it I have done quite a few now using this method.
Give it a go.

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