Question about Toshiba 50HX81 50" Rear Projection Television

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The dreaded convergence problem

Thank you for your help. I did find a burnt resistor. I replaced that resitor and now instead of the left (facing the front of the TV) end of my blue line curving downward it is curving upward and seems to be somewhat squiggly at the end. The blue line can be moved in all directions now and have tried the 9 point convergence adjustment and still cannot get rid of the curved blue line. I have checked the rest of the resistors on the convergence circuit board and all seem to be in the proper range. I even tried to move the rings on the Blue Gun.....still have the curve.... Is it possible that it messed up one of the IC's when powered up with the open resistor? How would one determine that? Since the Green, Red, and Blue connectors are the same, would it be possible to swap the connectors at the circuit board to isolate a possible bad Gun??? Would any of these tests or questions be covered in the Service Manual? Thanks again for any and all help.

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  • GLENN HOUSER May 22, 2007

    I guess my original message is gone...maybe I did not know how to reply properly. Yes that was the first thing that I replaced. The replacement of both STK's made no changes at all to the picture. Originally I could not move the blue up and down, only side to side. After I replaced the open resistor all control was regained, but only with a curved blue line.

    thanks

  • Anonymous Nov 20, 2007

    My red line will not move left or right, it will move up and down. I have no idea what to look at or where to even start looking. Please help

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Did you replace the stk's?

Posted on May 21, 2007

  • Charles Smith Jul 31, 2007

    make sure your yokes not shorted ohm them make sure you get same reading on all 3. Does this set have Digitel convergence?

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Hi there i replaced my hitachi 53uwx10ba convergence IC (2) stk392-120 and now it won't turn on and just flashes at the front panel 7 times, can i get some help pls


Did u check the pico fuse and all those resistors on the tv convergence board to make sure with ones are good resistors which are not good resistors and replace all them resistors too?U didn't do that should get it tested and replaces all those dying resitors.Try website like Tvrepairworld.com look up ur Hitachi tv model what resistors and pico fuse u require to check.

Aug 20, 2011 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

Front blower only works on high, what part do i


There are two things I can think of that may be causing your problem. First the blower switch in the dash may be bad if you do not have an electronically controlled blower, if you do it could be the control unit itself, but usually they stop working alltogether. The other part which may be bad is the resistor pack on your blower motor.

If your blower has four speeds on it like most blowers these days then this resistor pack will have four resitors mounted on it. They look like coiled wires. These resistors vary the voltage coming from the blower switch so you have different blower speeds. Kinda acts like a filter dropping the voltage for the lowest blower speeds incrementally.

If you want to diagnose this yourself it shouldn't be too hard. You will need a 12 volt test light or a multimeter to test for voltage. The blower motor should be located unther the hood of your vehicle on the passenger side against the firewall. It looks like a round black box with wires going to it. Where the wires connect to it the resistor pack is on the other end of the connector inside the motor housing. There are usually two screws or bolts holding it into the housing. If you take these bolts out it should come right out. You can visually inspect it and you may notice some charring on the circuit board where the resistors are.

I would measure power with you test light from the connector before it goes into the resistor pack. If you are receiving power at all blower settings then your blower switch is likely good since this feeds the signal to the blower motor.

You can then use a multimeter to ohm out the resitors on the resistor pack. If any of them show to be open you have a bad resitor coil there. You have two options at this point, you can unsolder the old resitors that are bad and try and replace them with comparable resitors from radio shack. Or you can go to rockauto.com and order a new resitor pack. They run about $16.00-$20.00.

Apr 08, 2010 | 2001 Dodge Grand Caravan

2 Answers

Why does the front heater blower fan not come on and the back fan does on a 2004 chevy venture van


They each have there on blower resistor circuit,and GM has been having blower resistor problems for years in all there models.It is located on the frt pass side below the dash in the heater case 2 bolts hold it in just unplug the 4-5 wire connector and use a 5.5mm socket to remove bolts and replace it with a new one if it is burnt out usually shows a black burnt mark on the resistor card.

Feb 10, 2010 | 2000 Chevrolet Venture

1 Answer

Problem with Samsung TV


SAMSUNG Convergence Problem


It looks like blue convergence. Look at menu, select convergence and see if blue top is bent down on convergence adjust screen. Probably won’t adjust.

Some Samsungs have convergence IC’s on a separate convergence board in the back of the TV. Others have the IC’s mounted on the main deflection board. Either way the board has to be removed to get at the dud IC’s and associated burnt resistors.

You remove the appropriate board, determine if any resistors are burnt or damaged, replace any burnt or out of tolerance resistors, replace 1 or 2 IC's and re-install the board.

Now you have to adjust it to look like new.

If the unit has not been misadjusted and everything is OK now, running the auto focus may put the picture back to it’s previous stunning quality, as it was before IC failed.

If after self or autofocus it is still misadjusted noticeably, try the customer convergence adjustments. Operators’ manuals are available on web through searching.

If convergence can not be adjusted properly, you messed up chip install or resistors may be wrong value or open; or it needs major adjustment.

If you live around Calgary, Alberta try me instead:

http://calgaryconvergencerepair.weebly.com/convergence-explanation.html


Or try to the find the repairperson part of this website (on the Homepage) and search postal code. Maybe you will be lucky and someone from your area is listed for Projection TV repair.

Most rookies doing this job will cause damage and not be successful. They will pay double for someone to fix their mess or end up scrapping the TV. It is not a simple task. It is more difficult than batteries on a remote.

Good Luck

easyab

Jun 06, 2008 | Samsung HCN4226W 42" Rear Projection...

1 Answer

One color Bow-tie Effect.


SAMSUNG Convergence Problem


It looks like blue convergence. Look at menu, select convergence and see if blue top is bent down on convergence adjust screen. Probably won’t adjust.

Some Samsungs have convergence IC’s on a separate convergence board in the back of the TV. Others have the IC’s mounted on the main deflection board. Either way the board has to be removed to get at the dud IC’s and associated burnt resistors.

You remove the appropriate board, determine if any resistors are burnt or damaged, replace any burnt or out of tolerance resistors, replace 1 or 2 IC's and re-install the board.

Now you have to adjust it to look like new.

If the unit has not been misadjusted and everything is OK now, running the auto focus may put the picture back to it’s previous stunning quality as it was before IC failed.

If after Perfect Focus it is still misadjusted noticeably, try the customer convergence adjustments. Operators’ manuals are available on web through searching.

If convergence can not be adjusted properly, you messed up chip install or resistors may be wrong value or open; or it needs major adjustment.

If you live around Calgary, Alberta try me instead:

http://calgaryconvergencerepair.weebly.com/convergence-explanation.html


Or try to the find the repairperson part of this website (on the Homepage) and search postal code. Maybe you will be lucky and someone from your area is listed for Projection TV repair.

Most rookies doing this job will cause damage and not be successful. They will pay double for someone to fix their mess or end up scrapping the TV. It is not a simple task. It is more difficult than batteries on a remote.

Good Luck

easyab

Jun 05, 2008 | Samsung HCN4226W 42" Rear Projection...

1 Answer

Convergence


There will be around 12 resistors all identical 6.8ohm that will sometimes go open if they dont have color bands they will be marked as 6R8 1WJ which means 6.8ohm 1 watt 5%

Apr 15, 2008 | Philips 60PP9202 60" Rear Projection...

2 Answers

Help


your having convergence circuit problems, you`ll need to change the convergence IC`s and any burnt resistors in the convergence circuit, if you have questions e-mail me back, good luck, BMW Rider

Jan 03, 2008 | Toshiba 53HX71 53" Rear Projection...

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