Question about Projection Televisions

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Have a toshiba model cn35d90 and took a power hit now sometimes color is off might go all blue/green or all yellow most of time its fine

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  • jtscudde Aug 13, 2008

    looking for a part number and name of curcuit board thats controls the color thanks

  • jtscudde Aug 14, 2008

    come on guys thats all i get for $10 . look for cold solder joint or do i have a warrenty? what i need is the name of the card that controls color or service manual toshiba model cn35d90

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If the set took a power hit, it is unlikely to be a cold solder joint that is the problem. The most likely part will be the "jungle IC" which is what generates the signal to the CRT. Power hits are not nice to electronics. There is no "board" that can easily be replaced. This unit must be serviced at the component level. I'll check the service manual for hte most likely parts.

Dan

Posted on Aug 14, 2008

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Try factory restore.if not solved by this then try this

High Voltage Capacitor? Leave the set unplugged for 1/2 hour most components will selfdischarge, as for your problem, you have one of two problems, the convergence I suspect is what is blown out, this unit probably uses STK392-110 Ic's, I would suggest replacing with STK394-160e chips as they are probably shorted, some of the big resistors (1 or 2) may be opened up also, usually they change color. The only other thing that would cause usually a yellow color in the corners is the CRT Fluid, it changes from clear to Orange in color and clamps off the blue color from the fringes, I suspect the chips need replacement, dont forget to put some heatsink dope behind them, they are usually on the left in the front of the set (from the back) Big long heatsink that is fairly tall (probably the biggest heatsink in the set.) Good luck, and the repair usually ru

Posted on Aug 13, 2008

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Dear,
what about circuit board. what it looks like .
check if there any broken leg of component or just touching the baord.
moreover, check for dry soldering..

regards,

Posted on Aug 13, 2008

  • SALMAN NASEER Aug 13, 2008

    check if u can the back pcb of the picture tube where the hose of picture tube is plugged.

    may be the pins of that causing the problem.

    TAKE ALOT OF CARE WHILE CHECKING or repairing the inside circuitry..

    because the picture tube has very high voltage there, even in power off condition.



    regards,

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Did u have warranty 4 u r tv.
If their means claim it.

Posted on Aug 13, 2008

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Try this site
www.circuitwork.com/techassist/tip/TOSHIBA2.HTML

Posted on Aug 13, 2008

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Base on the info you've given us, I'd first suspect bad connections that change the circuit characteristics. Resolder any connections that look grainy or have rings. Pay particular attention to the connections on the back of the CRT.
Let us know if you need further assistance.

Posted on Aug 13, 2008

  • 2 more comments 
  • Jaime Hernandez Aug 13, 2008

    The colors are controlled by a circuit board that is attach to the back of the picture tube. The parts that get affected by overheating are the transistors that are mounted on that same circuit board as well the high power resistors.

  • Jaime Hernandez Aug 13, 2008

    I would also suggest to be very careful if you are going to do this work yourself because there is high voltage is excess of 200VDC getting to the transistors.

  • Jaime Hernandez Aug 14, 2008

    Have you even opened the TV yet?

    We have given you the tips on where to check and what to do. If you still unhappy about, I would suggest to get a service tech to do it for you but that won't cost you $10.00 even if the tech only tells you what the problem is, will cost you more then that.

  • Jaime Hernandez Aug 14, 2008

    Here is a picture on that CRT board.



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2 Answers

I have a toshiba 65hm167 no red color on the screen


Your TV is a DLP one lamp does it all, not like the old projection TVs with the Red, Green & Blue CRTs. Your TV may have a bad light engine or lose cable connections.

Good luck
N Sabre

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That usually means the color wheel is going bad.
If you like the Tv and you are handy it is fixable. If you are not ready for that, give a repair man a call. It is worthe it.

Thank you for the chance to help.

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Yellow arch on bottom left of screen. I have


OK, HERE are the instructions:
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With the set on press MUTE on the remote.

Then press and HOLD mute for several seconds and while still holding it on the remote press Menu on the front of the set.

A (S) should appear in the upper right corner of the screen. (It means you are in the Service mode)

Press menu again on the front of the set

7 on the remote will call up the convergence grid

3 on the remote will change the color to adjust from red to green to blue(do not adjust GREEN)


You navigate the grid with 2, 4, 6, and 8 buttons.

To stop the cursor from blinking so you can adjust at any point use the 5 button—to move again use the 5 button.


When you finish you exit by hitting 7 on the remote again.


Sometimes you have to try a few times to get into the menu—I have had my problems but once in it is easy.


if adjusting does not cure the problem one of the convergence chips this set uses and or a resistor are bad.

Let me know what happens and if you need more help let me know
SD TECH



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1 Answer

There is blue yellow color blur on the screen with cable or dvd


Hi,
This problem is of "CONVERGENCE". You have to replace the convergence IC's which is better to buy a new one TV, Just contact any expert and replace the convergence IC's and your TV work fine again you need not to buy a new TV.
Thanks for using fixya.

Jul 24, 2009 | Toshiba 42H81 42" Rear Projection...

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Do you still have reds? Is the image still clear though discolored? If so you ought to replace the blue bulb which has most likely failed. The part no for the 57HX81 model blue CRT bulb is TOSHIBA     23008753. 

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the blue gun is not working properly which explains the dominance of green and yellow colors. you need to look after dry-joints on the blue gun circuit board, sometimes oil leakage from the lens may also affect the board

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Check you HD inputs or source. Sounds like the red stream is missing; maybe a loose cable.

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Your alignment is off. Go to the set up menu then convergence. hit right and you will be in the convergence menu. select the color that is not in alignment. The green line does not move. if blue and green are lined up the line will be cyan. if red and green are lined up the line will be yellow. when all three are lined up the color will be light. Best of luck!

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Hi, convergence circuit has failed, IC`s and probably 1 or 2 precision resistors will have to be changed, not really something you can fix if your not an electronics tech, BMW Rider

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1)Please verify your model # from back of set......

2)Reduce the color to minimum or tune in a black & white chan.
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3)Remove lower front grill cover & access panel.....locate the
focus / screen control block...turn blue screen control slightly
CW......red,green and blue must mix to equal gray

4) reset color to normal level.......reassemble

Dec 22, 2007 | Toshiba 57H82 57" Rear Projection...

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