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Chuck Williams
Chuck Williams, Technician
Category: TV
Satisfied Customers: 3810
Experience:  Over 25 years of experience servicing AV electronics to component level, ISF and THX Cert.
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The moment I turn the tv on it turns itself right off again.

Resolved Question:

The moment I turn the tv on it turns itself right off again. Previous to having this happen I heard something like a bulb breaking (3 times actually) and the picture faded out but after allowing the tv to cool down the picture came back again. So I know something needs to be replaced in back of the tv but when you can't even turn it on that's a real bummer! Authorized service dealers are 40 miles away from me (I live in the country) so I'd like to fix the tv myself if possible. When I bought this from the neighbor he said if anything goes wrong just get rid of it because it's too expensive to fix but I'm not so sure of that. Here's the information you may need: Mitsubishi HD 1080, model# XXXXX serial# XXXXX I am currently unemployed so I cannot afford a house call which would cost me $125. I also do not have a vehicle that can transport a large screen tv back and forth to a repair shop.
Submitted: 5 years ago.
Category: TV
Expert:  Chuck Williams replied 5 years ago.

Hi!

 

Turn the set on, then when it shuts down, press the INPUT and MENU buttons on the front panel together and hold them down for at least 6 seconds. This should cause the front LED to flash a 2 digit code. If it flashes once, then twice, then pauses and repeats, it means that the TV's computer didn't detect a problem. I'm expecting you will get a 2 flash, then another 2 flash code.

 

Let me know what the 2 digit code is.

 

Chuck

,

Customer: replied 5 years ago.
Ok, it flashes in a sequence of 4 times then pauses and then flashes in the sequence of 4 times again.
Expert:  Chuck Williams replied 5 years ago.

Hmm... that's not right. Are you sure it's not 2 - 2, then pause, then repeat?

 

If you unplug the set for 30 seconds, then plug it back in, the LED will flash 3 times. This clears the error code stored in the TV. Then try this INPUT and MENU test again without trying to turn the set on. It should flash 1 time, then 2 times, then pause, then repeat, indicatiing there is nothing wrong with the set (because it hasn't shut off since you unplugged it).

 

Chuck

Customer: replied 5 years ago.

That's exactly what it did

 

Expert:  Chuck Williams replied 5 years ago.

So, now try to turn it on, when it shuts off, try it again. Since it doesn't have an error code that starts with 4 flashes, it must be a 2 - 2, so verify that for me.

 

Chuck

Customer: replied 5 years ago.
It's 1,2-1,2 long pause and then it does it again 4 more times
Expert:  Chuck Williams replied 5 years ago.

No, I'm saying to now try to turn the set on, then when it shuts off, do the test. 1-2 means there is nothing wrong.

 

Chuck

Customer: replied 5 years ago.
Ok, I think I'm relaying this information wrong. The set still turns itself right off and then when I do that menu/input test it responds with a sequence of blinks 5 times. The sequence is: blink, blink, short pause blink, blink long pause and does this 4 more times
Expert:  Chuck Williams replied 5 years ago.

PERFECT!

 

You have a defective convergence output IC, and that causes one of two fuses in the power supply to blow. Your set has two of these IC's and fuses and they should all be replaced.

 

If you are handy with electronics and can solder and unsolder electronic components, you might be able to fix this yourself. I can give you part numbers and some pointers if you feel comfortable doing this, and given your situation, you should try it.

 

If you decide to call a tech, give him the make and model number, tell him what you told me and that you suspect a convergence output IC failure. He should immediately know exactly what to do, what parts to bring, and be able to fix it in your home in a little over an hour. Cost should be in the $325 range.

 

Good luck, let me know if you need anymore information regarding this issue, and thanks for using JustAnswer!

 

Chuck

Customer: replied 5 years ago.
Chuck: Could you give me the part numbers of the items I'll need to replace and any tips on the soldering would be helpful. Since I've never done that before I'll let my son take care of it.
Expert:  Chuck Williams replied 5 years ago.

Well, I may have mis-spoken somewhat.

 

Your model is unique in that it is so compact. It's considered a "table top" projection TV, and they really packed the electronics into this thing.

 

According to the service info, you cannot access the chassis on this model without removing the "light box", which is the tubes and the frame they mount on, so that's a pretty big deal to do.

 

If you are going to attempt this, I would strongly urge you to download a service manual for about $16 from Servicemanuals.net so you can see what's involved.

 

But assuming you can get access to the chassis, you will be removing the center PC board, called the Main Board, to replace the convergence output IC's, and the smaller board on the left called the Power Board to replace the fuses.

 

If you're still up for this, let me know and I'll continue.

 

Chuck

Chuck Williams, Technician
Category: TV
Satisfied Customers: 3810
Experience: Over 25 years of experience servicing AV electronics to component level, ISF and THX Cert.
Chuck Williams and other TV Specialists are ready to help you
Customer: replied 5 years ago.

Ok, lets continue, I'll let my son do it. Do you have the part numbers?

 

Customer: replied 5 years ago.

Ok, lets continue, I'll let my son do it. Do you have the part numbers?

I really appreciate your help in this matter but I will have to leave soon. Do you think we could complete the instructions in one more answer?

Expert:  Chuck Williams replied 5 years ago.

The parts you will be replacing are on the large heat sink on the Main Board. The part number of these IC's is STK392-110, they should be replaced with STK392-150 or -180, these are higher capacity IC's.

 

You have to find all of the Phillips screws that secure the board. Some are around the edge, but a couple are in the middle of the board, and three secure the heat sink, which has the STK chips that you will replace. The STK's are held to the heat sink with two screws each.

 

Now you have to pry up the white edge connectors that connect this board to the adjacent boards. They can be a bit stubborn, use the tip of a flat blade screwdriver to help do this.

 

Disconnect all of the connectors that go to various plugs on the board. They can only go back one way, so you don't have to pay close attention to which one goes where.

 

Once you've done all the above, you will see there are some plastic tabs on the front of the plastic tray that the boards are mounted on. You should be able to push on those and have the board come out easily. Do not force it, it will come out with no resistance if you have all the screws out.

 

Remove the Power board and look for the 5 amp fuses F9A04 and F9A05, they are near the power transformer, and are about the size of a grain of rice. They are soldered in, replace both of them (even if one checks good). You can order the STK chips from MCM Electronics by that STK number, and a box of five 5 Amp Pico Fuses with part number 28-0636.

 

Then just unsolder the old STK's, install the new ones and carefully solder them in, and make sure the new IC's have sufficient heat sink compound on the back of them (available at Radio Shack), reassemble it, and you should be good to go.

 

When you reassemble it, pay attention to the white edge connectors that you pried up during disassembly. When you push them back, many times not all of the pins will reseat properly. Run your finger across the tops of the connectors. If one pin didn't seat, you'll feel it immediately.

 

 

As I said, you also need to be able to solder and unsolder neatly and carefully, and if you've never done that before, you'd better practice this first on a junk PC board.

 

You are going to need a small pencil soldering iron (in the 25 watt range), some electronics solder (not the same thing that plumbers use), some desoldering braid and some silicone heat sink compound. You can get all of this at any Radio Shack.

 

Take the soldering iron, and once it's hot, you must "tin" the tip with fresh solder. Put plenty of fresh solder on the tip, then shake off the excess Then, just carefully place the tip on a piece of desoldering braid and put that on one lead from a convergence output IC, feed a little fresh solder onto it, and the fresh solder and the solder on the IC pin will wick away by capillary action, leaving you with just the pin of the IC unsoldered from the pad it was soldered to. This is going to take some patience and practice, and you should use a magnifying glass or very strong reading glasses when you do this.

 

Once all the pins are unsoldered, you can remove the screws holding the IC to the heat sink and remove it. Take a new IC and spread a thin layer of heat sink compound on the back of it, then mount it on the heat sink. It will be tricky getting all the pins to go through the PC board without bending, but with patience, you'll get it.

 

Now "tin" the soldering iron tip with fresh solder again. Put plenty of fresh solder on the tip, then shake off the excess Then, just carefully place the tip on one lead from a convergence output IC, feed a little fresh solder onto it, then move to the next pin and repeat. After you've done 4 or 5 pins, take the iron away and re-tin the tip with plenty of fresh solder and shake off the excess. You may want to wipe the tip off with a rag before putting fresh solder on the tip.

 

Once you're done, carefully check your work to makes sure you didn't accidentally solder two adjacent pins together. If you did, just use the desoldering braid to suck up the solder, and reapply new solder.

 

Once you're happy with that, reassemble everything, cross your fingers, and see if it works!

 

Let me know how that sounds or if you need more advice.

 

Chuck

Chuck Williams, Technician
Category: TV
Satisfied Customers: 3810
Experience: Over 25 years of experience servicing AV electronics to component level, ISF and THX Cert.
Chuck Williams and other TV Specialists are ready to help you
Customer: replied 5 years ago.
Thank you chuck, I appreciate all of your help! You're marvelous and so is this website!
Expert:  Chuck Williams replied 5 years ago.

Hey, thanks for the Accepts and your kind words, and best of luck to you!

 

Chuck

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Chuck Williams
Chuck Williams
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Over 25 years of experience servicing AV electronics to component level, ISF and THX Cert.