Question about Dell W4200 42 in. HD-Ready Plasma Television

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OPen the tv up

I am looking at the top board and i noticed that the 2 250v 1000uf 105c caps are buldging/swollen. Could this be the problem i am getting the red light/led on that board? Looking at the power on indicator on bottom of tv it shows blue light on. Thanks

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  • preludedez Feb 08, 2009

    I am pretty good at soldering but i just never came across a cap so huge so i just wanted to make sure that i clear up that the swollen cap was an issue. thanks again

  • preludedez Feb 16, 2009

    Well, I replaced the caps that had the bulge and still getting the red light. I am stuck on whatto do next

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The bulging/swollen caps mean that they have basically gone bad and have lost their capacitance and need to be replaced and are the most likely problem to the light that you are seeing. Make sure a qualified person replaces them otherwise you will just end up spending more in the long run.

good luck and let me know how it turns out

bestdarngood

Posted on Feb 08, 2009

  • Benjamin Patri
    Benjamin Patri Feb 16, 2009

    Well, these tvs have had their share of problems. Many times boards and not just the caps need to be replaced. Please describe in detail everything that you can about this tv. Picture and sound quality, whether there were lines on the screen (vertical or horizontal) What still works if anything, Also if any lights are blinking, what color and if any pattern let me know. Basically not a good sign, plus Dell is little help with dealing with these tvs except for sending it in and even more bad news is that parts are hard to come by. But lets start with whatever you can tell me before and after you started having this problem. Also what you have done to try to get this working. Sorry for the bad luck, will be waiting for your reply

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Look for Bad Capaciotrs on power supply board they will be vented or swollen on top. 1000uf 16v 2200uf 10v 3300uf 10v Caps $1.00
Mats Electronics 1-800-628-1118
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Replacing a 680uF with a 1000uF could be problematic depending on it's function.
680uF is pretty specific when 500uF and 1000uF are much more common and therefore cheaper - one would think that the engineers would have tried using those in the design rather than a 680uF - makes me think the value of the cap is important to the frequency of the circuit it's in.
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That's a rookie mistake, but still an easy enough one to make (for a rookie).
Also, with that many swollen caps, I wonder if there were any that leaked out the bottom before swelling at the top (IE - if some caps were missed in the replacement procedure)
Also, with that large a number of caps gone, other components may have been compromised or blown.
I'd be testing the transistors around those caps (most likely punched through rather than open), looking for fusible links (surface mount fuses, 0 OHM resistors) that may have opened up etc.
The initial attack on the problem was basically correct, and in many cases probably would have fixed it (if say the 680uF cap was functioning as a ripple filter).
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Basic LCD monitor and LCD TV troubleshooting guide:

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http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Failed TV, Monitors, Caps : http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitor kits: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
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Please post back what you find.
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