Question about Mitsubishi WS-65807 65" Rear Projection Television

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WS65807 I have a 65807 and need to know where two wires go. In the back of the set there is a small chip board that says 'Pre-Amp'. There are about 5 different wire coming from this board and all but two are connected. The two that are not are brown in color. They are connected at the 'Pre-Amp' but not at the other end...They appear to be have been pulled from a plug but I can't find any empty on the main boards. The set seems to be working just fine but these two way-ward wires have got to have a home somewhere!!! Please Help....Thanks..

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Re: WS65807

They may be for a different model with different features. many of these circuit boards are in many different models by many different manufacturers. If you want more info on the board find the serial number and the manufacturer on it and type it into google or similar - you might get lucky if it is a common board. If the set works fine then tie the loose wires out of the way, put the cover back on and watch the front. hope this helps :)

Posted on Mar 10, 2007

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Need Instructions to replace D Board in Sony KDP57WS655

Its a picture tube type rear projection---you face several issues here---

1. Finding a good replacement board
2. The D board is to the left as seen from rear.
3. multiple black foldover plugs on one side.
4. multiple plugs to board itself (two groups of 3 identical plugs to make sure you mark to get back exactly where removed.
5. multiple tiny brass screws that secure the board to the black plastic frame.
6. Two red wires from flyback (one fat and one thin) to remove--the thin one goes forward and can be pulled off where it connects and the fat one should have a short run up to the gray or black splitter where you push it in and turn to release it----a few versions require a special tool to remove it at the actual flyback.

When all (mark every plug) are free the board lifts up from front and comes out---common mistakes include not taking all the small screws out.

Lastly it is usually easier to repair than replace this board--you getting any error or blink code from the power light?

Also I have seen a bad convergence chip cause this (should be on same board and stk-392-560) and unsoldering both chips the set will come on----have to be careful there as lots of little surface mounted parts where chips solder in on bottom of board.

As much information as I can think of---let me know if need more help.

Regards, SD TECH

Dec 03, 2012 | Sony Grand WEGA KDP-57WS655 57" Rear...

1 Answer

How do i remove convergence chips unit on jvc av-48wp74

I have some good advice for you---done this on this model several times and I will attach a few photos as well..

The convergence board is at front of set---remove 2 screws on back on either side---two more tiny ones on front where control door is and lift and remove entire grill below screen off.

There is a inspection plate dead center behind where the grill was--remove it also.

Behind it is the convergence board. It helps to take rear cover off also.

there are about six plugs to remove---three are identical for the convergence yokes----make sure you mark them so they go back in the exact same place as removed.

There should be another plug going to (seen from front) left to the power supply board and another small plug to the front left.

The last plug is hard wired into the convergence board and goes back and up to another board where it can (from rear of set) be unplugged.

Board is held in place by plastic tabs at front of set into the black plastic frame--lift it carefully up in case is also screwed in(not usual).

You now can lift the board up and out the front of the set.

If you look at the resistors---in front of the chips I would test all the small ones there and look for any that are discolored--if memory serves me they are 1.8 ohm and 1/2 watt----only the 1/2 watt resistors will fail and usually the set will not come on if this is the case---power light constantly blinks will be the issue.

Let me know if you have not replaced the chips ever and I will give you some pointers etc.



Oct 30, 2012 | JVC Projection Televisions

1 Answer

I replaed the convergance chips and still have a red shadow on my sony 51 inch projection tv

This set has two 5 amp fuses on power board that feed the convergence circuit, did you test them?

I needed I can provide photo of that board, fuses are pico fuses and not glass.

Let me know and I will be happy to help you.


Nov 06, 2010 | Sony KP-51WS510 51" Rear Projection...

1 Answer

10 yr old projection wont turn on red light flashes but wont turn on.

Something easy for you to check. With the set unplugged remove the back cover. On the circuit board where the power cord goes there are at least 7 pico fuses.

They are small and look like resistors and are usually either green or orange in color. They will have the amperage marked on them and on the top of the circuit board where they are soldered in.

What you are looking for are one or two that will most likely be 5 amp fuses--these usually go to the Convergence circuit of this set--if you find either one bad--they check just like any fuse--you need to replace both Convergence chips and the fuse or fuses that are bad.

Let me know what you find and I will assist you--this is the most common problem in these sets--

If this has helped you rate this solution as I do this here for free.


Dec 06, 2009 | Toshiba 50H81 50" Rear Projection...

1 Answer

Just changed the convergence chips and now the TV shuts off imediately has a error code 2-2

One of two things has happened here.

First: 2-2 is short protection---98% of the time in this set it means one of the two 5 amp pico fuses on the same board as the convergence IC's is blown. They are located toward the back of the set in row of 5--green and look like resistors--should have location numbers on top of board F9A04 AND F9A05.

If you find either open most likely one of the two new chips you put in is either bad or when you soldered them in you shorted pins on the bottom of the board.

If the soldering is good--locate and replace either or both fuses that are bad AND BOTH CHIPS again.

You will not get a new chip that is bad very often but it can happen.

Did you remove the board to get at the chips etc or what?

I have done hundreds of these sets.

Let me know if you have questions and I will try to help you.

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


Dec 02, 2009 | Mitsubishi WS-55809 55" Rear Projection...

3 Answers

SD tech , you said you could give me start to finish instruction on replacing the convergence chips #STK-392-110. I have located the chips where you said they would be and i can solder but having some...

I am not SD Tech, but I can help you with this problem.
The chips are located on the signal board which you have already located. To remove that board you need to remove all the screws from the board, just look around at the entire surface, there should be one in the middle and the rest are along the edges. You will need a short Philips for the front ones.

After you have removed the screws you will have to remove the back AV cover, just remove all the black screws from the back of the cover and unplug the tuner switch. The tuner switch just unplugs from the board and the tuner. If you have dual tuners just unplug the second one as well.

Then remove all of the electrical connectors off of the signal board, don’t worry too much as they are all different sizes and most of the time they have letters that correspond to the plug on the board. There are three small 4 wire plugs in the middle of the board towards the front of the set that are all the same. If you have different colored sharpie markers just mark one a different color as you unplug them. These are important because they control the convergence to each tube. If you don’t have different colored sharpies then just mark them with a black sharpie and mark them will lines, IE; one line on the first one and so one.

When you remove the old IC's, please be sure to remove all of the old heat sink compound, as it can act as an insulation for the new IC's and cause them to overheat. I usually clean the heat sinks with alcohol and a small rag. Apply the new heat sink compound with a toothpick or some similar device and spread it evenly across the chip before you install them into the board. Once they are installed then you can secure them with the screws and don’t worry about the excess compound the squeezes out of the back of the chip, it will be OK.

Once you have the new chips installed check on the resistors and replace any that are charred or open, you can test them with a DVM on the OHM setting for the resistance value marked on the resistor.

Check for two resistors on the front of the board toward the middle these are the power supply resistors for the convergence IC’s. If they are open or charred, replace them as well.

At this point you should be able to reinstall the board, hook up the wired connections and then fire up the set before you put the back on. This will tell you if the set is going to work or not. If the set works, just finish putting the back on and then set up the convergence. It will need some adjusting because the new IC’s will be a little different.

If the set does not power up, let me know and I will try to help you with some further trouble shooting tips.

I hope this information allows you to resolve this issue.
If you need further assistance please comment to this post and I will try to help you further.

Thanks for using FixYa

Nov 02, 2009 | Panasonic PT-53TW53 53" Rear Projection...

1 Answer

REd light blinking on my 50HX81 CRT TV- Toshiba,no pic no sound

Two possible easy ways to find what the problem is:

1.) Locate F850 and F851 on the power supply board--they are fuses but not glass--little green or orange pico fuses---both will have the location marked on the top of the board.(THEY look like a small resistor)

2.) They protect the Convergence circuit on this set and if either is open (blown) the set will go into shutdown.

3.) If you find one is bad (or both) someone needs to locate the TWO convergence IC's that this set uses--they are located on large metal heat sinks side by side and are black in color with 18 pins each---2 1/2 inches wide X 1 1/2 inches tall and Black in color---they will have the STK-392-110 printed on them in white.

4.) The idea here is if the fuses are blown you need to gain access to the two chips and UNSOLDER all 18 pins on each of them--if either of the fuses are bad you replace them and with the chips unsoldered turn the set on---if it comes on and stays on the Convergence will be out the window--but you will know one or both chips are bad.

5.) If depends on if you are able to do this---the repair is fairly easy---hard part is getting at the chips---You need to replace BOTH of them AND check all the resistors around them (like checking a fuse--no reading across one means it is gone---This set uses several 1.8 ohm protect resistors for this---

If you find either of the fuses bad---you have to decide if you can do the repair or need someone to do it for you----IF EITHER FUSE IS BAD--DO NOT BYPASS IT OR REPLACE IT- a waste of time and doing that may just cause more damage.

Let me know if you find one or both 5 amp fuses bad.


Oct 10, 2009 | Toshiba 50HX81 50" Rear Projection...

1 Answer

We were watching a DVD last night and heard a "pop"

2 BLINKS, A PAUSE AND 2 BLINKS is short protection------most common reason for this is one of the two pico fuses that protect the 2 STK-392-570 convergence IC'S is blown----set will detect this and shut down instantly.

Someone needs to locate the fuses (usually on center board in the middle and towards the back) and check them---they are not glass fuses but look like a resistor and are solid green in color---there should be 4 or 5 of them---the two closest to the back of the set should have location numbers printed on the top of the board and are FA904 and FA905---both will be marked on the board as 5 A--5 amp.

If either or both are gone--they and the two convergence chips need to be replaced.

Let me know if you need any more information about what this repair consists of.

Regards, SD TECH

Oct 07, 2009 | Mitsubishi WT-46807 46" Rear Projection...

1 Answer

Red lines around images--Sony Kp-51ws510

There are two chips behind the large heat sink that need to be replaced. Also, depending on how the chip(s) failed, the fuses should be checked as well. They are very small, wired in, and right below the heat sink on the side nearest the back of the tv. There are 4 and they are brown in color. Can you unsolder and solder in the new chips? The cost for parts would be around $40.00.

Apr 12, 2008 | Sony KP-51WS510 51" Rear Projection...

1 Answer

RCA D52W17 Rear Projection HDTV......No Sound

in the sound settings is the amplifer set to external or internal.
if thats not the problem.. the audio amp chip might be out. to repair this a technician usally replaces what is know as the small signal board.

Jan 10, 2008 | RCA D52W19 52" Rear Projection Television

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