Question about ViewSonic N3752w 37 in. LCD TV

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Replace caps on power supply (15) caps. Voltages are all there but no picture. Any suggestion

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  • reci9306 Mar 17, 2011

    there is no display either,therefore not able to see the menu I don't hear sound .No cable is connected only via Air input.

    any suggestion please

  • reci9306 Mar 17, 2011

    No excess to cable but using ant as air signal,no sound and no display on the screen even meue
    all voltages are there on the power supply pcb.Please provide more info on this problem.

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  • ViewSonic Master
  • 5,568 Answers

You did not mention if you had sound; if you do, then the inverter for the backlight or the backlight CCFL has failed. The inverter is often on a separate board since these are often outsourced.

Posted on Mar 17, 2011

  • Steve Allison
    Steve Allison Mar 18, 2011

    > all voltages are there on the power supply pcb.

    Unless you have the means to observe the high voltage pulses produced by the inverter for the fluorescent back light, you haven't measured them all.
    In order to check that circuit you need an oscilloscope and the appropriate probe for it.
    Look for a separate board, it may be slim and will have fairly few parts visible on it.
    If you find such a board and have an AM radio of some kind, set it toward the low end of the band (600-800kHz), place it close to the set then use a small screw driver with an insulated handle and touch bare component leads with the blade, If that circuit is running, you should find a point that causes noticeable and repeatable noise from the radio.

    It bothers me that you have no audio either but to make sure the inverter is running, try the method I described.
    You are reaching a point where a lack of knowledge of the pin-outs of the integrated circuits and the likelihood that there are proprietary parts used in some circuits will become a barrier you cannot breach any more.
    In other words, a service manual would be needed to go further and those are often not available to the public and supplied only to 'authorized' service centers.

    While bad capacitors in the power supply is a very common cause of failure, the supply is not always at fault.

    Good luck-

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1 Answer

Will not turn on


Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and precious time.

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No sound and no picture.Power comes on with red light changes to green. Replace caps (15) on power supply.


You need to check and see if all the control voltages (Power supply on) and DC output voltages are present. PS pin out: http://www.fspgroupusa.com/download/specs/FSP271-5F01_DIA.pdf

Please read my guide to see how LCD TV works.
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.

Mar 16, 2011 | ViewSonic N3752w 37 in. LCD TV

1 Answer

42" magnavox lost picture but


Power supply problem. If you have electronic experience pull the rear of the panel and look at the power supply and check for bulged or leaking or busted caps replace them and i will probably be good to go. if you cant do component level repair order the whole board and also dont kill yourself - tv voltages and amperages are strong enough to kill a human.

thanks,
Michael

Feb 07, 2011 | Televison & Video

1 Answer

Dell e228wfp LCD with no power.


You need to check the voltages first, on the electrolytic caps in thepower supply section with voltage rating from 10~16vdc should have 5vdc on the two legs of the cap, this 5vdc is used for the logic board. The other caps with voltage rating of 25~35vdc should have about 12~18vdc on it's two legs. That is the starting point, these DC voltages are in the secondary side of the power supply, be careful on the HOTside of the power supply, it has high voltage about 160vdc and 120vac which can kill you, so be careful. If you can post pictures, it will help. See example of my pictures here: http://s807.photobucket.com/home/budm/allalbums

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1 Answer

Power supply no go. Has DCfrom bridge.


There shoud be a big elcetrolytic cap connecto the bridge rectifier output, ti should have about 150~160 vdc on that cap, if you do not have the dc on the secondary side, ti may be because it sees short circuits (you will hear fainted ticking sound), the power supply should have 5v and 12v at all time. Try heating up the primary circuits with hair dryer to see if will kick on. Post some picture will help, see example here: http://s807.photobucket.com/home/budm/allalbums

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1 Answer

I have Toshiba 15" lcd tv with vestel 17ips01-2 psu/inverter board.the tv will show a picture for a couple of seconds and then the inverter cuts out.


There are a few things that can cause this fault, but the most common is the High Voltage Capacitors that feed the backlights going bad. The invertor and power supply are on the same board (Vestel 17IPS01-2)

The caps are on the power supply board and are C355 & C356 (12pf 3kv) and C354 (4.7pf 3kv). If you replace these caps it will solve the problem in 99% of cases.

If replacing these three caps do not solve the problem then it may be easier to replace the power supply board... as fixing means replacing a tiny surface mount chip with loads of legs.

WARNING: The Power Supply/Invertor board can contain LETHAL VOLTAGES even when turned off and unplugged. if you are not sure, Pay someone to do it for you!

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2 Answers

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Olevia has problems with the power supplies. Best solution is to remove the back of the TV. On the 542 it is about twenty number 1 phillips head screws. locate the power supply connectors check the board for the voltages, clearly marked on the PCB. Continue to check the voltages by powering on the Television. all voltages should be within its described range. If a voltage is low or nonexistent, the power supply is bad, usually a bad capacitor.
There are three series of caps, on the low voltage side it is 16 volt, next 24 volt and finally 36 volt (these are just max ratings.
which ever power that was found low the cap would be near that voltage output connector.
next step is to remove the board and replace the capacitor, using a soldering iron and making sure to solder with no slop.
with the board on an insulated (nonconductive surface connect the board to the televion. Check voltages and if no other voltage issues reassemble.

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2 Answers

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Sounds like an inverter problem. If the power supply is internal replace the capacitors coming out of the voltage regulators. These are usually 1000mf and/or 470mf. If that doesn't do the trick look up the numbers on the 8-pin chips that drive the secondary transformers on the inverter to see if they are getting the right voltages.
Good Luck!

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1 Answer

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1. Check the Power Supply board to see any blown cap? Output voltages are normal?
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