Question about ViewSonic NextVision N3760W 37 in. LCD Television

6 Answers

Viewsonic N3760W Won't power up at all. tried unplugging, pressing on/off, etc. Someone said the board might be burned out. Set is less that (2) years old. Used as a PC monitor to roll powerpoint presentation. Thoughts? Thanks.

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  • Mark Grimes Jan 04, 2009

    I have a blown cap on the Power Supply. Would anyone know what the the C33 is. The can is completely gone. When it popped it really popped. I am hoping to at leat try to solder an new cap in if I can find the type an value.

    I have a N3260W but I think the N3760W is the same power supply.

    I really like this TV from an input perspective and would like to fix it.

    Thanks
    Mark


  • Cablenot Jan 09, 2009

    I have the same problem- no power. Fuse blown replaced still dead. Fior Crusher MG, C33 is 33uF 35V (same as C32)

  • untouchables Mar 09, 2009

    I have the same problem and can not find an replacement anywhere.

  • arthurether May 11, 2010

    It went to the repair shop, who said it was the mainboard. Viewsonic wants $400 for the replacement part, add labor and I might as well get a new TV. Unless someone knows where I can get a better price on a mainboard?

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6 Answers

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1. Try this - hold the menu button down for 10 seconds. TV should power up; you will have to turn off front panel buttons on menu.

2. You can also try plugging in the TV through the USB on its panel to a computer or USB charger, and it may work. However, this is only a temporary solution.

3. Powering down the set or putting it in standby may have allowed the power supply to cool. Weak capacitors often go out of spec when they cool, thus preventing a section of the power supply from firing up properly again. There is a simple trick...just warm the back of the TV with a hair dryer for 5-7 mins after you have unplugged the TV. Look for the little areas of holes in the back panel of TV. Use these as your guide at where to use the hairdryer, but don't hold the dryer too close (say 5-6inches away). (Make sure the dryer is on High heat). If the TV doesn't turn on after you have heated it up (like it tries to come on but then turns off) you need to unplug the TV again, this resets it. And repeat those steps till it works. Resetting the TV after it fails to turn on is the key. Also, just leave the TV on. Don't turn in off. Since it is LCD, it doesn't take much power...only a few bucks extra a month for your utility bill.

4. A circuit board may crack about some of the larger components mounted on it. You can inspect the PCB's for fractures, and then repair them. It may also be poor soldering that has failed. I would be checking for these things first.

5. If you want to go in for a long term solution, you can easily replace the whole power board or just change the faulty capacitors. You will have to open the back panel and take a look. You can make out which are faulty, because their caps will be swollen on top. Here's a sample pic (not same model):
Viewsonic N3760W - 34a4898.jpg
Check the specifications of the faulty capacitors, and get the replacements from your local electronics shop. If you are comfortable with this, you can use a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors. Once that is done, solder in the new capacitors carefully. If are unsure how to do this, try to get a friend who knows how to do this kinda stuff do it for you, or get a qualified technician. Warning: If you do not have a background in electronics repair, or are inexperienced, get a qualified technician to do it for you.

REMEMBER there are very dangerous voltages inside a TV that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT THE POWER BEFORE YOU DO ANYTHING.

Hope that helps!

If your issue is not resolved, please do not assign a rating just yet. Please post back as to what steps you took, results, etc, and I will try to assist you further as best I can. I am here at your service.

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IrishDruid

Posted on May 05, 2008

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I wanted to thank you irishdruid, perfect solution and picture helped a lot. I had the same problem where the TV wouldn’t power up. After changing batteries in remote and trying power on TV itself, I tried your solution 1 and 3. When neither of these worked I found a friend who was familiar with electronics. We checked for solution 4 and found it was solution 5 that was the problem. I had two bad caps, proof from swollen cap on top (like your picture). I couldn’t find the exact cap size because they discontinued. I found the best fit with the same uf, voltage, and C. We replaced and it works wonderful. I really appreciate your posting!

Thank you!

Posted on Mar 07, 2009

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I have one of these that the screen got cracked. If anyone needs any of the parts inside you can shoot me an email at mikeyburger2405@yahoo.com.

Posted on May 24, 2010

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Following up on my earlier post, I replaced all but the (physically) largest electrolytic capacitors on the power supply board, 16 in all, several that exhibited the "domed" top of an expired part. Ta-da! It's been running for several hours and looks great. I have an electronics background, so I was comfortable with sourcing and replacing the components. If you are not familiar with electronics component values and practices, DO NOT ATTEMPT THIS YOURSELF!. The correct parts are critical for safety and performance.

Posted on Jan 14, 2009

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My partner just walked into the bedroom and found me doing something really weird. She could not work out why I was pointing the hair dryer at the back of the Viewsonic N3760w LCDTV and blowing hot air into it. The tv had died and nothing I did would bring it back to life. Tried POWER button unlock. Tried holding down MENU button. Checked power supply by plugging cable into an old PC - it worked fine. Was looking forward (not) to unscrewing the back and fiddling with the innards. Not my area of speciality. As a last resort I tried the hair dryer on the rear. I aimed at the slotted air vents to the top right of the power supply inlet (bottom right hand side of the set viewed from the rear). Ran it on full blast for about 6-8 minutes and lo and behold the power light came on. I was amazed and she did not believe me when i told her. She thought i had done something teccy to it. All I did was blow hot air on it as suggested. Still waiting for BT cable vision to handshake but it is looking good at the moment. I have no idea how you worked that solution out IrishDruid but it worked a treat. If you are ever in London or next time I am in Athy I owe you a large number of beers. Many thanks indeed. ( LCDTV flat screen n3760w pvf no power dead screen no LCD not switching on power supply failure will not switch on system reset - just a few google tags to help the thousands of other people who seem to have the same problem)

Posted on Nov 13, 2011

  • John hooper Nov 14, 2011

    Viewsonic N3760w LCDTV no power. IrishDruid is quite correct in suggesting that you keep it on at all times. If you switch it off you have to go through the hair dryer routine again (12 minutes the second time around). If it does not appear to work when nice and hot switch it off at the mains and it will come on. Presumably that somehow resets it. Thanks again ID.

  • Romeo Mercado Aug 24, 2012

    WOW. This works!I had a chat with a viewsonic tech..no solution. He apparently does not know the "hairdryer fix" thanks alot

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Irish druid's solution #3 worked perfect for me. Thanks a ton. Saved me hundreds in repair!

Posted on May 17, 2009

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1 Answer

Viewsonic won't power up


I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.6_17_2012_2_14_45_pm.jpg6_17_2012_2_15_03_pm.jpg

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1 Answer

I have a viewsonic N3760w tv and it takes a long time to turn on. I will press the power button on the tv and remote, and it takes 2-5 minutes to turn on. What is the problem. Please help.


It may be a bad solder joint on the power supply board, it may also be a failing capacitor on the power supply board, It would require the board to be removed from the set and inspected visually as well as with a capacitance meter. Inspecting the solder connections for a questionalble one takes some time, but it may also be faster to simply reflow the solder connections on all the solder joints on the board.

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1 Answer

I wont turn on viewsonic n3760w.


Viewsonic N3760w LCDTV no power. IrishDruid is quite correct in suggesting that you keep it on at all times. If you switch it off you have to go through the hair dryer routine again (12 minutes the second time around). If it does not appear to work when nice and hot switch it off at the mains and it will come on. Presumably that somehow resets it. Thanks again ID.

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1 Answer

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Very carefully. I only would do it after you have verified the warranty is expired per Viewsonic. If it is OOW, then you can call them for a service manual that contains schematics, troubleshooting flowcharts, etc.

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Sounds more like the main power supply problem. You are only getting the the 5v standby voltage.

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Try unplugging the set from the AC power source wait for several seconds and then plug it back in. Cross your fingures and hope that the reset works!

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