Question about Projection Televisions

1 Answer

Troubleshooting hv shutdown on mitsubishi vs-4543

Replaced blown stk-391-020's, 3, also str-m6811 regulator Ic900 got all B+ back ,hv comes back but in shutdown.How to bypass shutdown to trouble shoot set?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 1,153 Answers

Did you replace fuses going to low voltage supply going to amps?

Posted on Oct 16, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Mitsubishi vs-60705 deflection code 23 clicks tubes start to glow and tuns off checked horzonal out trans both good thinking it might be vertical chip la7845n or flyback regulator switch ic 900 str-m6811


On this tv there are a few things more common. Usually a bad regulator will be shorted which will not allow even a click when you attempt to turn it on. A vertical i.c. bieng bad will cause a double click at power up. My best guess after repairing about 300 of this model is to solder the connections on the yokes first. These are reached from the front of the set and you have to usually loosen the yoke tension screw and turn it to be able to solder the connections.( When you get the set to come back on you will have to adjust them slightly). If that doesn't take care of the problem I would look for leaky capacitors around the 5,9 and 12volt regulators. These are located on the signal pcb and I think it's C2P05 that is the most common one to fail. Third thing to check is cold solder around the convergence i.c.s You may even replace these chips just to be safe. Surely one of these should fix the set. Good luck, Russmann.

Mar 25, 2010 | Projection Televisions

1 Answer

Mitsubishi model #VS-4543


2 THINGS CAUSES THIS PROBLEM ON THESE --- THE BLUE PICTURE TUBE HAS LEAKED FLUID ON THE CIRCUIT BOARDS ,,,THAT 'S BAD
AND SOMETIMES ,WHEN THE VERTICAL CIRCUIT GOES OFF ,,THE SCREEN WON'T LIGHT UP ,,,THAT NORMAL ,,,KEEPS FROM DAMANGING OTHER PARTS
U NEED A TECH TUNICA

Oct 29, 2008 | Mitsubishi VS-45607 45" Rear Projection...

1 Answer

Please help!!!!!!!!!!!!!!!


Good Day;

It sounds like you may problems in the TV's circuits, but try resetting first by unplugging TV from power source. If no fix try these areas of concern:

1. SHUTDOWN CAN BE CAUSED BY NO VERTICAL DEFLECTION. SINCE THE VERTICAL CIRCUIT IS POWERED BY THE SWITCHED POWER SUPPLY THE UNIT MUST BE TURNED ON TO TROUBLESHOOT THE CIRCUIT. THIS CAN BE ACCOMPLISHED BY TEMPORARILY DISCONNECTING THE VERTICAL INPUT TO THE X-PROTECT CIRCUIT. ** TO PREVENT DAMAGE TO THE CRT'S YOU MUST UNPLUG THE CRT PCB'S. ** TO DEFEAT THE X-PROTECT CIRCUIT, UNSOLDER D4A1 LOCATED OFF THE COLLECTOR OF Q4A1. IF THE UNIT POWERS ON AT THIS POINT, YOU HAVE CONFIRMED A VERTICAL FAILURE AS THE CAUSE FOR SHUTDOWN. ** D4A1 MUST BE REINSTALLED IN CIRCUIT TO PREVENT CRT DAMAGE. ** 2.CHECK PIN 1 OF IC401 FOR 10.7VDC. IF LOW OR MISSING CHECK FOR SHORTED D4000 LOCATED OFF PIN 1. (PCB-MAIN) D4000 PART #264P487030 3. CHECK PIN 8 OF IC401 FOR 27.7VDC. IF MISSING CHECK FOR OPEN D955 AND L961 AT S1 TERMINAL OF T902. (PCB-POWER) D955 PART #264P102040 L961 PART #411P012010 4. CHECK FOR DEFECTIVE IC401. IC401 PART #272P239040, OR INSTALL PT# IC-401, THIS KIT CONTAINS CAPACITOR C920, D4000 AND IC401. BE SURE TO MOUNT C920 ON FOIL SIDE OF PCB. 5. EXCESSIVE 130V SUPPLY. CHECK C911 47 UFD 100 V AND C914 47 UFD 50 V, IN THE IC900 CIRCUIT. Good Luck, big IRISH.

Sep 26, 2008 | Mitsubishi Projection Televisions

1 Answer

Model vs-4543 mitsubishi tv


Good Day;

One of these may be your problem:

1. SHUTDOWN CAN BE CAUSED BY NO VERTICAL DEFLECTION. SINCE THE VERTICAL CIRCUIT IS POWERED BY THE SWITCHED POWER SUPPLY THE UNIT MUST BE TURNED ON TO TROUBLESHOOT THE CIRCUIT. THIS CAN BE ACCOMPLISHED BY TEMPORARILY DISCONNECTING THE VERTICAL INPUT TO THE X-PROTECT CIRCUIT. ** TO PREVENT DAMAGE TO THE CRT'S YOU MUST UNPLUG THE CRT PCB'S. ** TO DEFEAT THE X-PROTECT CIRCUIT, UNSOLDER D4A1 LOCATED OFF THE COLLECTOR OF Q4A1. IF THE UNIT POWERS ON AT THIS POINT, YOU HAVE CONFIRMED A VERTICAL FAILURE AS THE CAUSE FOR SHUTDOWN. ** D4A1 MUST BE REINSTALLED IN CIRCUIT TO PREVENT CRT DAMAGE. ** 2.CHECK PIN 1 OF IC401 FOR 10.7VDC. IF LOW OR MISSING CHECK FOR SHORTED D4000 LOCATED OFF PIN 1. (PCB-MAIN) D4000 PART #264P487030 3. CHECK PIN 8 OF IC401 FOR 27.7VDC. IF MISSING CHECK FOR OPEN D955 AND L961 AT S1 TERMINAL OF T902. (PCB-POWER) D955 PART #264P102040 L961 PART #411P012010 4. CHECK FOR DEFECTIVE IC401. IC401 PART #272P239040, OR INSTALL PT# IC-401, THIS KIT CONTAINS CAPACITOR C920, D4000 AND IC401. BE SURE TO MOUNT C920 ON FOIL SIDE OF PCB. 5. EXCESSIVE 130V SUPPLY. CHECK C911 47 UFD 100 V AND C914 47 UFD 50 V, IN THE IC900 CIRCUIT. Good Luck, big IRISH.

Sep 14, 2008 | Mitsubishi VS-45607 45" Rear Projection...

1 Answer

Mitsubishi VS-5071 rear projection turns on, has audio but no video


That is a VZ3 chassis, similar to Mitsubishi models Ts-4545, Ts-5045, Ts-5545, Vs-4543, Vs-4544, Vs-5043, Vs-5044, Vs-5047, Vs-6043, Vs-6047 and has common failures in the vertical circuit, specifically vert Ic401 which is a La7845 which is usually caused by defective C402 100uf 50v and/or open 1.2 ohm 2 watt R510 next to FBT.
If not that check C268 off Q215 on signal board 22mf/50v and Ic200 on signal module Cxa2025s. However the vertical failure is more likely.
Bill

Sep 10, 2008 | Mitsubishi VS-5043 50" Rear Projection...

1 Answer

Mits rear projection VS-4543


i wouldahve the power supply checked out,,,it sounds like it may be getting weak

Jul 08, 2008 | Mitsubishi VS-5043 50" Rear Projection...

1 Answer

Mitsubishi


Good Day, ya'll;

TRY THIS:

1. SHUTDOWN CAN BE CAUSED BY NO VERTICAL DEFLECTION. SINCE THE VERTICAL CIRCUIT IS POWERED BY THE SWITCHED POWER SUPPLY THE UNIT MUST BE TURNED ON TO TROUBLESHOOT THE CIRCUIT. THIS CAN BE ACCOMPLISHED BY TEMPORARILY DISCONNECTING THE VERTICAL INPUT TO THE X-PROTECT CIRCUIT. ** TO PREVENT DAMAGE TO THE CRT'S YOU MUST UNPLUG THE CRT PCB'S. ** TO DEFEAT THE X-PROTECT CIRCUIT, UNSOLDER D4A1 LOCATED OFF THE COLLECTOR OF Q4A1. IF THE UNIT POWERS ON AT THIS POINT, YOU HAVE CONFIRMED A VERTICAL FAILURE AS THE CAUSE FOR SHUTDOWN. ** D4A1 MUST BE REINSTALLED IN CIRCUIT TO PREVENT CRT DAMAGE. ** 2. WITH VERTICAL PROTECTION DEFEATED (D4A1 OUT OF CIRCUIT) WHEN THE UNIT POWERS R514 (PIN 11 OF THE FLYBACK) OPENS. CHECK PARALLEL CAP. C512 .33 UFD 400 V IF C512 IS GOOD REPLACE THE FLYBACK PART # 334P191020 ON THE MAIN PCB. 3. CHECK PIN 1 OF IC401 FOR 10.7VDC. IF LOW OR MISSING CHECK FOR SHORTED D4000 (PART #264P487030) LOCATED OFF PIN 1. (PCB-MAIN) 4. CHECK PIN 8 OF IC401 FOR 28.4VDC. IF MISSING CHECK FOR OPEN D520 AND R540 AT PIN 5 OF FLYBACK TRANSFORMER T503. (PCB-MAIN) D520 PART #264P102020 R540 (1.2 OHM 1/4 W) PART #103P398010 5. CHECK FOR DEFECTIVE IC401, PART #272P239040 ( PCB-MAIN) 6. CHECK R540 1.2 OHM 1/4 W OFF PIN 5 OF FLYBACK (PCB MAIN). 7. EXCESSIVE 130V SUPPLY. CHECK C911 47 UFD 100 V AND C914 47 UFD 50 V, IN THE IC900 CIRCUIT.

If you are not technical then you should call a factory authorized service dealer and an estimate, as you can see this can get complex.

Good Luck, big IRISH.

May 19, 2008 | Mitsubishi VS-45607 45" Rear Projection...

3 Answers

Mitsubishi big screen tv


The VS5043 shuts down for many reasons. The most common are power supply issues. Bad caps, open resistors, shorted regulators, and missing voltages will cause the set to shutdown.
In my notesI have a location of components known to cause your problem( R5A03,L5A00,D5A21,Q5A04,Q5A03,C5A19,L902,IC900.IC700) All the parts listed are available. As I stated above there are many reasons for shutdown such as a bad flyback transformer that may not be available anymore. However, this type of failure needs to be properly diagnosed by a qualified technician. Good luck!

Sep 23, 2007 | Mitsubishi VS-5043 50" Rear Projection...

1 Answer

Vs-5043


1. SHORT DETECT SHUT DOWN (PIN 15 OF IC700) CHECK FOR OPEN L902 PART # 351P070010 OFF Q904 C (15 V SUPPLY) ON THE MAIN PCB. 2. SHORT DETECT SHUTDOWN (PIN 15 OF IC700) CHECK FOR SHORTED D913 PART # 264P722010 AND OPEN Z901 PART # 283P039020 (Z905 AND Z900 MAY ALSO BE OPEN BECAUSE OF THIS). 3. X-RAY SHUTDOWN (PIN 55 OF IC700) CHECK FOR A LEAKY D5A09 PART # 264P244030 OFF PIN 6 OF IC5A01. 4. X-RAY SHUTDOWN (PIN 55 OF IC700) CHECK FOR LEAKY D5A21, PART # 264P045040, IN THE BEAM PROTECTION CIRCUIT ON THE MAIN PCB. 5. CHECK FOR LEAKY Q5A03 AND/OR Q5A04 BOTH PART # 260P559050, IN THE HIGH VOLTAGE DETECT CIRCUIT, ON THE MAIN PCB.

Jan 11, 2007 | Mitsubishi VS-5043 50" Rear Projection...

1 Answer

65 inch Mitsubishi tv Model # vs-60703


so does it have sound??? If so then the set is probably in a hv shutdown because of a weak tube or is in vieo safty mode as the vert has failed in the set. On cost here in Michigan a tube could cost up to 300 bucks + labor and on the vert repair about 250.00 to 400.00 to fix

Mar 30, 2006 | Mitsubishi VS-60703 60" Rear Projection...

Not finding what you are looking for?
Projection Televisions Logo

Related Topics:

75 people viewed this question

Ask a Question

Usually answered in minutes!

Top Projection Televisions Experts

Jaime Hernandez

Level 3 Expert

2267 Answers

matt martin
matt martin

Level 3 Expert

1191 Answers

yadayada
yadayada

Level 3 Expert

60867 Answers

Are you a Projection Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...