20 Most Recent Mitsubishi WT-42311 42" Rear Projection Television - Page 4 Questions & Answers

Yes you will need to replace both STK394-250 Ics You can get the ICs and instructions from www.tvrepairworld.com

It sounds like the fluid in the projectors has possibly degraded. Sometimes there are settings you can use to adjust your T.V. If that doen's work, then it costs about $700 or so to replace the fluid in the projection tubes.

where you saw blue it sounds like your blue crt is shorting out could be just the video amp so
i would suggest you have a tech look at it for and estimate

Good Day;
The TV has a convergence problem; the IC’s for that circuit will need to be replaced. The cost for this repair runs around $450.00 or more. The part location : IC8C01&02; part number (gen) STK392-110. The parts are on center PC board. and the parts are located on the large silver heat sink.
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Good Luck, Big Irish.

It is NO ERROR DETECTED--means whatever is wrong it is not triggering the error buffer.

You may need to have someone look at the set to find what the problem is.

Let me know if you have questions.

If this helped you, rate this solution as I do this here for FREE.

SD TECH

Iff it's more or less like a green shadow to the picture,then you have a convergence IC issue. This is 99% of the shadow problems.

Look in the back of the set for a 40-60 pin IC chip about this big
I-------------------------------------------------------I

There will be two of them with a part number on the front of them. You should replace BOTH at the same time otherwise you may have to shortly replace it again. Replace both,save yourself time and money.

If you think you can do this yourself then you will need a soldering iron and desoldering braid.

have you gone into the menu and tried to adjust the convergence back
if you have and it doesnt move
you have a convergence ics that have failed and they will have to be replaced

if you have the tools a soldering station and some knowledge
you could replace them your self or you may want to enlist the help of a local servicer in your area

the convergence ICs need replacement. you can get the convergence repair kit at www.tvrepairworld.com

2, then 2 is short protection. What it usually means in this model is one of the two STK-392-110 convergence chips has shorted and taken one of the 5 amp pico fuses out that protects the chips.

The set will detect no voltage to Convergence circuit and shut down instantly----It could be a short elsewhere but 95% of the time it is one of the convergence chips.

This model uses a light box---with the back removed and several screws removed and one large square plug on the left side(as you look from the back) unplugged-----everything comes out in one piece--the sides are plastic and actually have handholds to pull the box out once it is unbolted.

The question is can you do this? You will need to get the box out and check the pico fuses near the chips--they do not look like regular fuses but can be tested like testing any other fuse---If one or both are blown--you need to replace them and BOTH chips---you can get replacement chips for about 12 dollars for a pair on Ebay---I buy mine there.

Each chip has 18 pins and is black in color (about 2 1/2 inches wide by 1 1/2 inches tall with the STK number printed on them in White) and in this set they are located on metal heat sinks near the very front of the Chassis.


Let me know if you have questions or need help--IF YOU CANNOT DO THIS REPAIR LET ME Know and I will give you advice.


I am here to help people.

SD TECH

First: Go to Ebay and then to search, then advanced search, then to search by seller---look for : sewsales55 he has the chips.


I do this here for free so if it helps you give me a vote here I will give you instructions on this repair in your set--not real hard if you know how to solder etc.

Regards, SD TECH

Are you sure tube is bad and that projecion fluild isnt contamiated if tube lights up but you can not see a picture clearily or at all fliuld is bad remove old fluid replace with new problem FIXED Call Mats for projection fluild 1-800-628-1118

Replace both of your STK ICs set should come back on then, they are big black ICs will have part number on them.Call Mats for parts 1-800-628-1118. STK392-570 maybe what your TV uses.

This can only be carried out by a qualified person.

It is highly likely that the main power supply has failed; your description points to this.
The main supply is normally on separate board, recognizable by the larger components on it and it will be related to the incoming AC line. Look for cylindrical parts mounted 90 degrees to the board as well as larger (inches) blocks, these are chokes and transformers. The supply is typically connected with plugs and jacks and not tough to remove.
If you can locate the board, look for an assembly number and contact the mfr. with that and your model/serial number and inquire about replacement or repair cost.
If you must buy a new one, look for smaller companies that offer repairs on supplies since it makes sense to have a sapre around for the next time.

ur power board ic inverter is about to die.
It will die sooner or later,when it dead.U get no
power period,must replace the board.

The surge protection built into the typical power strip is primitive and the component(s) that provide protection by conducting (shorting) between the hot and neutral degrade with repeated activation. They are worth much when new and after having switched a few times, the voltage breakdown point moves uprange and they become less effective.
Most more expensive electronic systems have better internal protection than that afforded by the majority of the power strips and there might be an internal fuse that blew that can be replaced. I'm afraid however that the main power supply has taken the hit.
The supply is normally built on a separate boardsince these are often out-sourced by set manufacturers.

Unplug your set overnight to allow potentiallyhazardous voltages to discharge, remove the lower back panel of the set so you cansee the guts.
Look for a smaller board with larger parts onit; some cylindrical (capacitors), others block-like and relatively large(chokes and transformers).
You should also see a relationship between theboard and the incoming AC.
Check the board for a label or if not present, astamped-on number.
Call the manufacturer's service center with yourTV model number and the number found on that board and inquire aboutrepair/replacement costs; if both are offered, they won't be that muchdifferent.
If you must buy a new board, don't dispose ofthe failed one as there are smaller companies that can repair it for less thanthe mfr. and then keep it as a spare as this problem will likely arise again.

If you reside in an area of frequent electrical storms, I highly recommend you install or have installed a 'whole house' surge protector. These are either installed in an existing main breaker box or in an auxillary box next to the breaker.
The device and installation labor fall between $150 - $300 US and have an included insurance policy that covers losses of 10 or 25 thousand dollars.
This Google link will bring a large number of links to retailers of these:
Surge Protection

in thee plug if not call costemer support

Your symptom sounds like a damaged component in the pincushion circuit.

If your colors line up in the middle of the set and at the top but the picture is concave then you may have a faulty component in the pincushion circuit. When this circuit fails the picture will have an hourglass shape to it with black in the middle on the sides, or you will see square objects as hourglass shapes.

I would recommend that you have a local service center diagnose the set for you and give you an estimate of the repair.
I have seen this type of repair run from $250.00 - $350.00.

I hope this information allows you to resolve this issue.
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Sounds like power supply problem. Possible high voltage problem not allowing basic saftey circuit to be normaled. Professional repair suggested.