20 Most Recent Mitsubishi VS-50705 50" Rear Projection Television - Page 5 Questions & Answers

you would need the service manual to even begin to repair it yourself as it could be literally 50 different reasons why it isnt powering up. I would suggest getting a service manual at the following link , as they will email the manual to you after purchase and then they will provide free tech support to help you diagnose the actual problem , but its a hopeless cause without the service manual. Heres the link.
http://servicemanuals.vstore.ca/

Usually the capacitors will be around the convergence IC's near the heatt sinks. It should be easy to spot the busted capacitors, their tops will be bulging. Here is a sample pic:

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. The capacitors are usually 680 - 1000 micro farad and 35V. however, if you dont find 35V, you could use a 50V as well. They will be slightly larger, but you should be able to get them to fit in.

HERE is a clear step by step procedure with pictures.
If your TV is still under warranty, then the best thing to do would be to take it back to the shop and get a replacement.

First thing a tech would do is solder around Convergence amps then check to see if you can align by menu then if can not. Change amps and maybe resistors.

ctechnicians.com

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. Not using the TV in a while 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.

4. Some TV's require an input signal (from cable/VCR/DVD/CD, etc) to enable them to power on. Try connecting a cable line or DVD to the TV and see if this helps.

5. 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.

6. 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):

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!

yes, this sounds like a fuse blown or open. What model is this a VS or YS?

I would recomend getting the service manual at the following link as if you change the wrong item you can actually harm the set often real bad. The following link will email it to you within minutes of purchase and will offer free tech support to help you with it. heres the link
http://servicemanuals.vstore.ca/

D980 also you can change C411,412

THIS MODEL IS EQUIPPED WITH A KEYBOARD LOCK FEATURE; THIS CAN BE MISTAKEN AS A NO POWER CONDITION. TO UNLOCK THE KEYBOARD PRESS AND HOLD THE "MENU" BUTTON ON THE FRONT PANEL FOR 10 SECONDS

Do you still have this problem?

Not to me, but it also depends on if you could do this yourself or not. And the area you are in sometimes is responsible for the cost being high.

Yes . Some of these caps are in the secondary of the power supply and some are on the signal board around 5v and 7v supply lines on the signal board . The 5 & 7 are mounted on heat sinks and the caps are right around there .Generally either 2.2uf or 4.7uf or the 47uf . Good luck

Your two problems are different . Your tv shutting down is not due to the tuners . First thing i would check is to unplug set and take the back off . On the left side is the board with your tuner on it . Look on that board to see if these is any liquid buildup on it. One of your picture tubes could be leaking causing set to shut down . This can also be causing your snowy picture problem as the liquid has started to spread . The metal braket above this board is where the liquid starts to trickle down from . Use a flashlight to see . If you see no liquid then you have hv sweep problem which would need to be checked out. If you still want to get a board www.ptscorp.com May have your board in stock . Good luck

I am not aware of this model having the pip bypass procedure . Older models Yes . I have though seen some of these sets were the picture tube leaked onto the cicuit board causing this problem. With the tv unplugged and the back removed , Use a flash light and look at the board on the left to see if there is any liquid on this board . It is usually below the metal brackets where the picture tubes are mounted . Sometimes you can swipe your fingers on the under side and fill the fluid coolant . Then look right below that area and you'll see it on the board . Use paper towels to dry up well . Then plug back in to see if your problem is resolved. Now if it leaked that is telling me your seals are leaky and need to be replaced and coolant added to that picture tube that was the problem . This can be very tricky to do . If that was your problem call around to get your best price to repair your set without them telling you , you'll need to get the picture tube replaced . Good luck

we need to know if the lines are of different colors or are they white and the screen is too bright ?, 275.00 seems a lot just to get it check out but it all depends were you are,in NY that could be a going charge but in pittsburgh it seems too much,please let us know what the lines look like.

Sound like the lamps are ageing or the lamp PSU is playing up.

rule number one about all vs chassis with vertical can pip boards take them out and throw them away i could fix one but you couldnt beleive me and it wouldnt be worth your while do a search on your modle number until you come up with instructions on how to add two caps to the pip board connector to bypass it until you do this you are wasting your time Mitsubishi ... we're still building Zeros

The lamp is not enabled possibly due to the colour wheel motor not turning. Any broken glass jamming it? Or the lamp ballast has failed due to an old/worn lamp.

Most likely you need to replace the projection bulb. You can find them online. DLP sets are famous - or infamous - for burning out the bulbs/lamps.

Your Mitsubishi VCR HS-U580 looks to have a problem with the information rollers and drum. Here are some things to check: Look for something blocking the VCR or cassette compartment that would possibly be stopping the guide rollers. Check the belt that drives the VCR mechanism. If it is loose or broken, you may also need to substitute it. Clean the video heads using a head-cleaning cassette to make certain they're not dirty. See if the drum motor is working. If it is not spinning, there may be an issue with the motor. If the trouble persists, it's an exact idea to get assistance from a professional technician or contact Mitsubishi's purchaser support for advice. Be cautious when dealing with electronic devices, and if you are not certain what to do, it's great to get assistance from an expert.