Question about Mitsubishi VS-45605 50" Rear Projection Television

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Vertical problems I have a VS45605 which has vertical problems. Tech said my two amps on big heat sinks are shorting and need to be replaced. labor $150 plus $149 for each part (2) Does anyone have a schematic or know part numbers of what looks like powerpacks sandwiched on a board with lots of heat sinks?

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Re: Vertical problems

I have the same problem and I replaced the stk's and the ic's and 20 caps and 10 or so resitors and it's still there. Do you think the problem is under that cover.

Posted on Apr 11, 2008

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Re: Vertical problems

This sounds like convergence amps not vertical, what was the set doing prior? If convergence amps first check: E2RESET DOES NOT RESET THE CONVERGENCE. THE CONVERGENCE CAN BE RESET BY PRESSING "MENU 12598970", IF THIS DOES NOT RESET THE CONVERGENCE TRY "MENU 125968970

Posted on Sep 18, 2007

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Ln 840410

You have bad grounds in the horizontal or vertical area of this TV. I have not repaired this model. I have repaired many of these, in other TVs. You will examine ICs mounted to large heat sinks. Find the vertical IC and resolder pins here. Check the horizontal Transistor (mounted on heat sink as well) and resolder this. Resolder any of the large transformer coil pins as well. Be sure to resolder the Flyback Transformer pins. And lastly look for bad capacitors (capacitors will bulge) and their grounds as well. Heat is the big problem in any electronics and solder will separate the pins from the traces and cease circuit flow. This is slow and tedious work on one hand but an easy fix for the experienced. Thanks for asking me!

May 26, 2013 | Projection Televisions


How to find and replace a defective vertical IC.

When your TV works, has sound, good indicator light but all you have for a picture is a horizontal line across the screen, you have no vertical drive. This can be caused by the IC overheating or a power spike. In addition if you have a newer TV (projector) it may not turn on and will only blink an error code.

This is not a difficult fix but requires patience, good soldering skills and dilligence. Begin by unplugging the set and removing the rear lower area. Around the perimeter of the section you will see screws. Some will have arrows pointing at them. Remove all these screws and remove the rear cover.

Now you should be able to see the entire chassis. It will be mounted on a plastic frame and will consist of two or more circuit boards. The one, usually on the left, will be a small signal board. The one on the right will be the low voltage power supply, high voltage power supply and you guessed it, the vertical drive section.

The vertical IC is located near where the wires from the yoke which are red,green,yellow and blue terminate on the main board. The yoke is a large coil on the rear of the CRT which spreads the beam. It is slid over the glass CRT. Follow the wires (which should be green, yellow, blue and red to the circuit board. This will be the vacinity of the vertical IC. It will be mounted to a large heat sink and generally the designation begins with "LA" followed by 4 numbers. Panasonics generally begin with TDA.

Once located, remove and replace the unit. Removing the unit will probably require removing the circuit board. This involves removing all the screws around the perimeter of the board and any which you find in the center of the board. Do not force it, if it will not move easily look for and remove more screws.

You can get the replacement parts at . Make sure you clean off the old heat sink compond and reinstall new heat sink silicone also available at the same web site. The heat sink compound facilitates heat transfer to the heat sink and keeps the IC cool. Generally the ICs are run at a high output and get very hot.

After replacement of the IC check all the safety resisters near it for continuity and also any and all diodes for integrity. These parts would be in the vicinity of the heat sink. Removing the IC may require prying it off the heat sink as many times the heat sink compound acts like a glue.

If everything checks ok you should have a working set.

If you do not have vertical drive, you will need a schematic to find the power source for the IC and test the circuit to see if it has the proper voltages.

You can sometimes get schematics from but they do not have all of them. If you do not mind paying about $16.00 US you can get any service manual from .

Once the proper power is supplied to the IC you should have a working set.

Remember to use an isolation transformer anytime you are going to check voltages in the set. Modern TVs have the chassis attached to neutral making a 60 volt difference between the chassis and hot side. This means that if you do not use an isolation transformer and apply a DVM with a low path of resistance you will cause a direct short and blow the fuse, if you are lucky. Also remember to be careful when measuring voltages as there are lethal voltages in a TV when plugged in and running.

Thanks for using FixYa and for the great rating.


on May 11, 2010 | Projection Televisions

1 Answer

The bottom portion of my screen is double vision witht the colors red and green only

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ur tv has problem with vertical scanning section. may be dry soldering or vertical output ic faulty.
check for any dry soldering in that section. mainly the soldering of vertical ic. if see or not re-solder the leads of the vertical ic . then check is the tv is ok or not. if complaint remains replace the vertical scanning out pout ic. it will be fitted on a aluminum heat sink in the vertical section. u can see the heat sink on which the ic is mounted in the picture ( in side the small green circle). if u need more assistance feel free to contact through fixya.



Jan 05, 2011 | Panasonic PT-47WX53 47" Rear Projection...

1 Answer

Describe your WS48311 Problem When I turn the TV on I get sound but a black picture. If I wait long enough a very faint picture may eventually show up but also appears to skip. it worked just fine...

Good Day;
You could have one of two problems:

More than likely your TV has "COOLANT" (ethylene glycol) on the circuit boards. This fluid comes from the CRT's (picture tube) this fluid is used to keep the CRT's cool, such the name. This fluid from the CRT's leak when TV is on for long periods of time, the chamber expands and the seals leak.

One can remove this fluid by using "acetone" & small brush. The fluid is hard to see, use bright light, the spots can be smaller then a DIME. Also, the fluid can corrode the parts and traces on the boards. To protect the TV in future place heavy plastic or thick cardboard over affective area, make sure TV has proper air flow around TV.

Always try resetting the TV by unplugging it for one minute then plug back into A/C outlet and ALWAYS UNPLUG TV BEFORE ATTEMPTING ANY REPAIR ON THE TV.

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 device 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 LEAKY C9A60 470 PF 1000 V PART # 154P400030, PARALLEL TO D9A57 ON THE POWER PCB. 2. SHUTDOWN AT POWER WITH SELF DIAGNOSIS ERROR 2 2. 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. Part numbers F9A04; 283P044020, F9A05; 283P04090, ICs (2) 267P141030 / STK392-110.

To repair first remove the chassis by removing one screw from chassis (near center board on left hand side). release 2 chassis locks on inner sides of the Light Box Assembly and slide chassis towards the rear.

Remove all screws from center board, unplug/disconnect all cables and connectors. The ICs are located on the large silver like 'heat sink' in center of board. Unsolder ICs and fuses and replace ensure that white subtance (heat sink compound) on heat sink is cleaned off, then reapplied.

Good Luck, Big Irish.

Good Luck, big IRISH.

Dec 02, 2009 | Mitsubishi WS-48311 48" Rear Projection...

1 Answer

I have a toshiba TP55C81 projection TV. The red The red vertical adjustments stopped working. The adjustmnet knob in the control panel does not effect the adjustment and none of the vertical adjustmen

You need to replace the vertical STK convergence chip but I would recommend that you replace the horizontal chip at the same time as this is likely to fail soon.

The following relates to the repair I have recently carried out to my Toshibal 40WH08B rear projection TV but shuold be very similar to your model. Replace the STK chips with the same type on your model:

On the convergence board PB 9487 (the one with the 2 large heat sinks that the r, b & g guns plug into) you will see two STK392-110 ics connected to the large heat sinks. Replace both of these and readjust convergence in service mode if necessary.

I obtained the replacement ics from Charles Hyde & Sons Ltd (see link below). I ordered the general ics not the Toshiba ones as these are identical as far as I could see and they cost £17.19 each instead of £36.68 each.

You will need to desolder the heat sinks as well as the ics as access to the ic mount screws are obstructed by the conv.dig board (metal cased). Buy a good quality desolder pump if you dont have one.
One last thing I should mention. The white paste between the ics and the heatsink is silicon thermal compound. Without this the heatsinks will not take heat from the ics effectivly and the ics will burn out! I recommend that you clean all of the old paste off the heatsinks and apply new to the whole of the metal plates on the back of the ics before you screw them to the heatsinks. You can get the thermal compound and the desolder pump from the same supplier I recommended for the ics.

Let know if your are having any problems.

May 30, 2009 | Toshiba TP55F80/81 55" Rear Projection...

1 Answer

Convergence amps

you need to change the ics that are located on the converge board is the one that is screw to the heat sink change both or the closes to the rear is for green vertical and horizontal and blue vertical and the one closes to the front is for the red vertical and horizontal and blue horizotal it starts with a STK number.

Jun 16, 2008 | Toshiba 55HX70 55" Rear Projection...

1 Answer

57H81Toshiba Blue Line not straight

You have a bad convergence output IC in the blue vertical circuit. On the bottom side of the chassis you will see a " V " printed by the heat sink. You will need to unsolder the heat sink and the 20 pins on the IC to remove it. Replace with STK 392-180 (sanyo) if possible or STK 392-150. Looking from the rear the heat sinks are big aluminum finned rectangles. There are 2 heat sinks one marked H and one Marked V. Even though you have a horizontal line your problem is in the vertical IC. Be sure to use a liberal dose of heat sink compound.

Mar 21, 2008 | Toshiba 57H81 57" Rear Projection...

1 Answer

Panasonic pt-51g42v

You might have bad solder joints on the vertical output IC. I do not know where it is located in this set only that it will be mounted on a metal heat sink near three wires that have identical plugs which go to the deflection yokes on each crt tube. Sets vary as to placement of vertical IC. Solder joints should be easily seen if you have good eyes or use a magnifying glass. I do know that the vertical IC will be on the board that has the highvoltage transformer on it (has big red wire). You may have to unplug the board and turn it to the soldered side or just turn the entire chassis up 90 degrees to see the connections. If this is not the problem I don't know how to get into the service mode at this time.Hope this helps

Dec 28, 2007 | Panasonic PT-51G42 51" Rear Projection...

1 Answer

RCA P46770CK

Check Cr4503 in the vertical circuit for short or leaking. The convergence circuit is most likely fine. Also check for any leaky electrolytic caps in the 500 block. (example) CR4503 will be printed on the PCB as CR503. The vertical circuit is located in the center of the chassis behind the big aluminum heat sink.

Nov 01, 2007 | RCA P46810LV 46" Rear Projection...

2 Answers

Distorted picture

The RCA P52960 uses the PTK195 series chassis. There are 2 main boards at the bottom of the set and above the board on the right (when viewed from behind) is the convergence power supply board. This board usually has a big black IC on it, labeled STK730-010 and bolted to a metal heat sink. Chances are, that IC has burned out and stopped working. Replacing that IC should restore your convergence. If you do not have experience replacing IC's in projection sets, allow a qualified tech to handle it for you.

Aug 29, 2007 | RCA P52960 52" Rear Projection Television

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