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January 19, 2007 11:24 AM

Categories: Televisions and Projectors

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dirk

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Joined: 01/19/2007

I own a Mitsubishi Projection Television, WS55511, and have not had any trouble with it until yesterday. When we tried to switch the unit on, the green power light illuminated for several seconds and turned off. We have tried to reset the system by pushing the system reset button on the front of the unit and by a hard reset, unplugging the unit for 4 hours. After the hard reset the green light flashes for up to 30 seconds then goes out. When the TV is turned on the same problem as previously described happens.  Does anyone have a suggestion on how to repair or reset the problem?

Discussion:    Comments 1-25 of 62 | Latest Comment | 1 2 3 Next »

January 19, 2007 12:32 PM

This set has a few common problems that come to mind, but if you have not worked on printed circuit boards or do not know how to read a schematic, I highly advise you to find a local service depot for the repair of this set. Being that said: CHECK FOR 12 VOLTS DC (AC-OFF DETECT) AT PIN 3 OF PC9A21 IF MISSING REPLACE PC9A21 PART # 268P058020 ON THE POWER PCB.
CHECK FOR OPEN FUSES F9A04 AND F9A05 ON THE +24 AND -24 VOLT LINES.  IF THE FUSES ARE OPEN THE CONVERGENCE OUTPUT CIRCUIT WOULD BE SUSPECT.  CHECK FOR LEAKY C9A60 470 PF 1000 V PART # 154P400030, PARALLEL TO D9A57 ON THE POWER PCB.  Good Luck, and let us know how you made out.

"Those who do not know their opponent's arguments, do not completely understand their own".**For complete TV repair kits including parts goto www.TvRepairKits.com

January 21, 2007 11:14 PM

Larry,

Thanks for the troubleshooting info. Question, with the back of the  unit open, where are the fuses located.

Thank

January 22, 2007 1:41 AM

Just removed the back panel and located the fuses. Will let you know how things turn out.

January 22, 2007 10:29 PM

Larry, first of all, thank you for pointing me in the right direction with the trouble shooting! I have not checked for 12 VOLTS DC (AC-OFF DETECT) at PIN 3 OF PC9A21 yet, but I found fuses F9A04 AND F9A05 open.  After finding the fuses open, I followed your instruction and checked  C9A60 for leakage. After locating C9A60, I found a hard off white substance, simular to the appearance of liquid nail, that appears to have flow between C9A60 and C9A58, sticking the two capacitors together. This substance has further flowed onto the PCB board extending 1/2 inch onto the circuit board. Is this hard substance the leakage you were referring to? If this is normal, there is not other leakage on the PCB. I welcome your expert advise, if I should only replace the fuses or include a new C9A60 replacement too?

January 22, 2007 10:44 PM

Remove the capacitors and certainly clean the board off the best way you can with 95% alcohol with a cotton swab and replace the capacitors as well.  If this is the case you could still have bad convergence IC's.   Best ting to do, is after you replace the capacitors, and clean up the printed circuit boards, take the main fuse out and across the terminals, clip a 100 watt light bulb across the open fuse terminals and turn on the set.  If the bulb blinks on and off there bis a short in the set, if the buld glows bright and then goes dim, replace the fuses and see what happens.  If the bulb glows bright and does not go dim, the convergence IC's are most likely bad.

"Those who do not know their opponent's arguments, do not completely understand their own".**For complete TV repair kits including parts goto www.TvRepairKits.com

January 23, 2007 12:29 AM

The material that appears to have leaked from the capacitor is as hard as dried Elmer’s glue. Will the alcohol dissolve the substance or should I attempt to carefully pull it off the board before cleaning with the alcohol? Also is the main fuse you refer to is the one located adjacent to the power cord attachment point on the PCB? Again, thanks for the help.

January 23, 2007 8:34 AM

That is mpst likely the clue that the manufacturer had on the board to hold in the part during assembly of the board. before the put the board through a solder bath.  Check the convergence IC's if those fuses are open

"Those who do not know their opponent's arguments, do not completely understand their own".**For complete TV repair kits including parts goto www.TvRepairKits.com

January 23, 2007 11:04 AM

Where are the convergence IC's located?

January 23, 2007 2:16 PM

They are black in color, and stand up against a large metal heat sink, and start with the letters STK

"Those who do not know their opponent's arguments, do not completely understand their own".**For complete TV repair kits including parts goto www.TvRepairKits.com

January 23, 2007 2:49 PM

Thanks again for the direction. Forgot to ask, HOW do you slide the ciruuit board tray out for access? It's loose but will not pull out.

January 23, 2007 10:47 PM

You pull the entire chassis out.  It should show you how in the service manual.

"Those who do not know their opponent's arguments, do not completely understand their own".**For complete TV repair kits including parts goto www.TvRepairKits.com

December 29, 2007 6:10 PM

Hi, I also own a ws55511 tv, I have the blinking green light for approx 30 seconds then goes out. The light is next to the power button on front. The Tv will not power on. I do not have an owners manual for this. Im pretty handy with most projects. I can figure out schematics and solder ok. I was told over the phone with a person at best buy that the problem may be a bulb? Seems others have the same problem and Im reluctant to purchase a bulb if its the fuses or capacators. Can you send me a manual or further advice on this matter?

December 29, 2007 9:15 PM

I too need the pic and manual to replace the capacators. I  will try and be sure to get back and post after trying the fix.   my e-mail is lynhadley@q.com Your the man Larry Dillon thanks.

2of12

December 29, 2007 10:20 PM

simitom, if the green light stops flashing after you plug the set in, thats an indication that the DM is working properly. You probably have other issues with your set. Check the fuses F9A02, F9A03, F9A04, and F9A05 in the power supply.  If one or more of them are open let me know.  or Good Luck

"Those who do not know their opponent's arguments, do not completely understand their own".**For complete TV repair kits including parts goto www.TvRepairKits.com

December 29, 2007 10:28 PM

20f12, the info will be sent out to you in a little bit. Good Luck and Happy New Year.

"Those who do not know their opponent's arguments, do not completely understand their own".**For complete TV repair kits including parts goto www.TvRepairKits.com

February 4, 2008 12:06 PM

Hi, I have a ws42311, i found the f9a05 fuse open, replaced tv played for

3 hours, and i try to program a unveral remote for the tv and hit power

on the unverial remote and set turned off, about a half hour later

i went back to turn tv on again and i get the green blinking lite, code 22.

Any ideas, caps, stk ic's. Any help and info would be great. My email is alprepress@yahoo.com

February 4, 2008 12:56 PM

If you found the F9A05 fuse blown, you should have replaced the convergence IC's before replacing the fuse. Hopefully you have not caused any further damage to the power supply or the convergence circuit. Fuses do not blow in these sets for no good reason. REPLACE THE IC's FIRST! Then the fuse. Good luck

"Those who do not know their opponent's arguments, do not completely understand their own".**For complete TV repair kits including parts goto www.TvRepairKits.com

November 3, 2008 5:27 PM

Larry,

I am having similar issues on my ws-55511 to what I see in this thread, orginally I had the eternal blinking green light and have since replaced the caps on my DM module, now the blinking light is gone within 20 seconds.

Now the issue is 3 seconds after powering on it powers right back off. I'm thinking it's a power supply/convergence IC issue or fuse issue. While I see the boards are mounted on a sliding chasis without trying to pry to much I do not see a way to remove the boards without undoing every cable and screw.

I was wondering if you wouldn't mind sending me a copy of the service manual if it is available. my email is tlehrer1@yahoo.com.

Any help is appreciated, thanks for all the infomation thus far.

November 3, 2008 6:08 PM

I feel a little foolish. I overlooked the one (and only) screw that was holding the slide out in place. lol. I assumed it was there to hold the two piece of the slide together. Well, with that said I should be on my way toward making my set work once more. But would still love any information you can toss my way. Once again thanks for all the help.

November 6, 2008 4:07 PM

HI,

New here...We are going to do a Bob Villa and fix our Mits WS55511. I am having the same light comes on solid and then turns off. No blinking and we are getting a 2 2 error code. We are figuring it is the IC's. I think from reading we have all we need in reagards to the reapair. I just want to check and see if there is any kind of a special heat sink compund you have to use. I looked online and they are all different. I like the price of the tube at Radio Shack, plus I can get it locally. I just want to make sure I do not need anything special.

November 6, 2008 9:22 PM

that will wrk fine but I use computer grade. It may well be I never have read the package on that one yet.

"Those who do not know their opponent's arguments, do not completely understand their own".**For complete TV repair kits including parts goto www.TvRepairKits.com

November 7, 2008 9:24 AM

Thanks Larry...I did want to ask about a new thing we found when we were looking closer. Right next to the pico fuses (both are open) there are several black cylinders. Between 2 of those cylinders we are seeing a creamy colored, hard substance that goes on to the board. It cannot be removed because it is very hard. Is this normal, or did one of those cylinders leak? The cylinder itself looks fine. Thanks!!

November 7, 2008 11:54 AM

no that is most likely silicon adheshive.

"Those who do not know their opponent's arguments, do not completely understand their own".**For complete TV repair kits including parts goto www.TvRepairKits.com

November 7, 2008 12:02 PM

Great...I ordered the parts today (took your advice and orderd Sanyo) and I am pretty sure the IC's are my problem. Both of the pico fuses are open so that makes me think IC's. I have the service manual, but is there any special tips to removing the chassis? Once replaced how hard is it to align the picture? Thanks for the help...

November 18, 2008 8:42 PM

Have the same problem with our WS55511. Will occasionally stay on for up to 4 hrs. but most of the time will not stay on at all..Mitsubishi Authorized Tech has said that the part needed to repair the set is no longer available. This set has this known malfunction and all parts made by Mitsubishi for this repair have been used up. He contacted Mitsubishi and told them that the part is no longer available. They are looking for it..he says they won't find it. So we are waiting on Mitsubishi..we are basically being told that we have a $3,000 set that is not repairable..

Discussion:    Back to Top | Comments 1-25 of 62 | Latest Comment | 1 2 3 Next »

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