Question about Mitsubishi VS-5043 50" Rear Projection Television

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Tv Powers up and immediately back off

My TV will power up and then click back off like someone hit the power switch. I can keep turning it off and on and eventually it will come on and stay on for anywhere from 5-25 minutes and then will click off again. When on, the picture and sound are fine.

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This model is equipped with a self-diagnosis feature to help with diagnosis of shutdown problems. To activate this turn the unit on let it shutdown then press the input and menu buttons on the front panel simultaneously and hold them in for 5 seconds after 5 seconds the power LED on the front panel will blink a two digit sequence. This will be one set of blinks a short pause then another set of blinks, this will repeat 5 times. 1 - 2 = no error detected 2 - 1 = X-ray protect (high voltage or beam current) 2 - 2 = Short protect (short protect monitors low voltage supplies) 2 - 3 = Deflection protect (this could be loss of vertical or horizontal deflection) 2 - 4 = Vertical protect (usually loss of vertical from the source) 1. Shutdown at power with self diagnosis error 2-2. Check for open fuses F9A04 and F9A05 part # 283P144080 on the +24 and -24 volt lines. If the fuses are open the convergence output circuit would be suspect. 2. Shutdown at power with self diagnosis error 2-1. At power on check for 12-volts DC at connector KH pin 8, if missing check IC9C51 part # 270P990010 and L9C52 part # 441D009020 on the Signal PCB

Posted on Aug 26, 2007

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Here's how to scan for TV codes on your DIRECTV remote

1.Make sure your TV is turned on.

2.Slide the mode switch at top of remote to "TV".

3.Press and hold the MUTE button. This is located above the number 1 button.

4.While still holding down MUTE, press and hold the SELECT button until green light at the top of the remote flashes twice.

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My Viewsonic N3250w tv I have had for 4 years no longer powers up. If you hit the button it lights up around the switch but then almost immediately powers back down. Does this sound like a power supply...


Power supply module will be the first thing to check, look for bad caps, find out if it has standby 5vdc and other voltages.
http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20N3250W/
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Parts: www.shopjimmy.com
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Tv turns on and immediately powers down. no


Hello,

The power light may be flashing or if you are runing with a series light bulb it may be cycling on and off continuously. There may be a chirping or clicking sound from inside the set. (Note: using too small a series light bulb load during testing for the size of the TV may also result in this condition.)

If there is a low voltage regulator or separate switching supply, it could be cycling on and off if the horizontal output, flyback, or one of its secondary loads were defective.

Does this TV have a separate low voltage regulator and/or switching power supply or is it all part of the flyback circuit? For the following, I assume it is all in one (most common).

Some simple things to try first:

Verify that the main filter capacitor is doing its job. Excessive ripple on the rectified line voltage bus can cause various forms of shutdown behavior. An easy test is to jumper across the capacitor with one of at least equal voltage rating and similar capacitance (make connections with power off!).

Use a Variac, if possible, to bring up the input voltage slowly and see if the TV works at any point without shutting down. If it does, this could be an indication of X-ray protection circuit kicking in, though this will usually latch and keep the set shut off if excessive High Voltage were detected.

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1. Press and hold the TV key. 2. While holding down the TV key, press OK. 3. Release both keys. The Device Keys will blink twice.
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TIP: Press ff slowly so you know when it powers off and when you need to save the code by hitting OK after it powers off.

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Good Luck!

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