Question about Toshiba 27D46 27" TV

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Toshiba 27d46 27' TV

I have a vertical problem Screen squished to about 1/4'. I have replaced ic401 and a few of the caps around the ic. After i replaced the ic the picture went back to normal for about 30secs then back to the same problem. Like I said before I replaced a few of the caps in the vertical section, I am thinking its a cap , But I do not know what one to look for. Also I went over all solder joints for cold solders and everything looks good. If somebody can pont me to the right caps or parts to look at PLEASE HELP!!

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Change the vertical IC

Posted on May 16, 2009

  •  Francisco Mauricio G
    Francisco Mauricio G Jun 11, 2009

    Check the smallest capacitor around the vertical IC and if you can change it

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2 Answers

Toshiba, 36A50 picture is a thin white line. Can this be repaired?


Yes...this TV may be repaired. The line you describe is in the center and is horizontal across the TV. You will need to resolder the vertical IC pins. This vertical IC is mounted on a large heatsink. Under the board you will see there are 5 or 7 pins that will have rings around them. Resolder these. And you should replace two or three capacitors that are next to this IC. A bad cap will overheat an IC and separate the solder grounds. If you can find my expertise page on this website, you will see the repair in more detail. Thanks for asking and show a few hands of support.

Dec 12, 2010 | Toshiba 36A50 36" TV

1 Answer

Screen is black wiht a single 1/8 thick horizontal line across entire screen. Sound is ok. Other TVs are working.


cold solder in vertical ic and check caps around to..if you see resin around any cap, change.

Apr 22, 2010 | Toshiba CF32H40 32" TV

1 Answer

Where are the vertical deflection caps located


Check C421, C427 and C429. These capacitors are located nearby IC401. IC401 is mounted on a heatsink and has the following markings on the body LA78041

Feb 11, 2010 | Toshiba MW27FP1 27 in. TV/VCR/DVD Combo

1 Answer

Vertical Distortion fix for Toshiba 32 inch TV


You have bad capacitors and possibly a vertical IC that is going bad. And check for bad grounds in and around the IC and caps!

Dec 10, 2009 | Televison & Video

3 Answers

My 15 year old Toshiba Televisiononly shows a narrow horizontal band in the middle of the screen. Sound OK.


Hiii fairley,

You aren't specsificly dercribe yor tv set.
For common TV horizontal problem ;i.e : White line accross the horizontal screen, horizontal band,etc..it's can solved by replacing the IC Vertical/Transistor, and olso to replace the cap nearest the IC.

For common TV Vertical Problem :i.e : White line at the center of the screen (top to bottom),Vertical band,etc...It's can cure by Replacing the Horizontal IC/Transistor,and offcurse the cap's.

Tha's what all I know....

Hope can help you to solved the problem.

Thank's

h3liax

Jun 22, 2009 | Toshiba 32A33 32" TV

1 Answer

Model vs-4543 mitsubishi tv


Good Day;

One of these may be your problem:

1. SHUTDOWN CAN BE CAUSED BY NO VERTICAL DEFLECTION. SINCE THE VERTICAL CIRCUIT IS POWERED BY THE SWITCHED POWER SUPPLY THE UNIT MUST BE TURNED ON TO TROUBLESHOOT THE CIRCUIT. THIS CAN BE ACCOMPLISHED BY TEMPORARILY DISCONNECTING THE VERTICAL INPUT TO THE X-PROTECT CIRCUIT. ** TO PREVENT DAMAGE TO THE CRT'S YOU MUST UNPLUG THE CRT PCB'S. ** TO DEFEAT THE X-PROTECT CIRCUIT, UNSOLDER D4A1 LOCATED OFF THE COLLECTOR OF Q4A1. IF THE UNIT POWERS ON AT THIS POINT, YOU HAVE CONFIRMED A VERTICAL FAILURE AS THE CAUSE FOR SHUTDOWN. ** D4A1 MUST BE REINSTALLED IN CIRCUIT TO PREVENT CRT DAMAGE. ** 2.CHECK PIN 1 OF IC401 FOR 10.7VDC. IF LOW OR MISSING CHECK FOR SHORTED D4000 LOCATED OFF PIN 1. (PCB-MAIN) D4000 PART #264P487030 3. CHECK PIN 8 OF IC401 FOR 27.7VDC. IF MISSING CHECK FOR OPEN D955 AND L961 AT S1 TERMINAL OF T902. (PCB-POWER) D955 PART #264P102040 L961 PART #411P012010 4. CHECK FOR DEFECTIVE IC401. IC401 PART #272P239040, OR INSTALL PT# IC-401, THIS KIT CONTAINS CAPACITOR C920, D4000 AND IC401. BE SURE TO MOUNT C920 ON FOIL SIDE OF PCB. 5. EXCESSIVE 130V SUPPLY. CHECK C911 47 UFD 100 V AND C914 47 UFD 50 V, IN THE IC900 CIRCUIT. Good Luck, big IRISH.

Sep 14, 2008 | Mitsubishi VS-45607 45" Rear Projection...

1 Answer

Mitsubisihi hd 1080 t.v.


Good Day;

Try this when th TV wont turn on:

1. SHUTDOWN CAN BE CAUSED BY NO VERTICAL DEFLECTION. SINCE THE VERTICAL CIRCUIT IS POWERED BY THE SWITCHED POWER SUPPLY THE UNIT MUST BE TURNED ON TO TROUBLESHOOT THE CIRCUIT. THIS CAN BE ACCOMPLISHED BY TEMPORARILY DISCONNECTING THE VERTICAL INPUT TO THE X-PROTECT CIRCUIT. ** TO PREVENT DAMAGE TO THE CRT'S YOU MUST UNPLUG THE CRT PCB'S. ** TO DEFEAT THE X-PROTECT CIRCUIT, UNSOLDER D4A1 LOCATED OFF THE COLLECTOR OF Q4A1. IF THE UNIT POWERS ON AT THIS POINT, YOU HAVE CONFIRMED A VERTICAL FAILURE AS THE CAUSE FOR SHUTDOWN. ** D4A1 MUST BE REINSTALLED IN CIRCUIT TO PREVENT CRT DAMAGE. ** 2.CHECK PIN 1 OF IC401 FOR 10.7VDC. IF LOW OR MISSING CHECK FOR SHORTED D4000 LOCATED OFF PIN 1. (PCB-MAIN) D4000 PART #264P487030 3. CHECK PIN 8 OF IC401 FOR 27.7VDC. IF MISSING CHECK FOR OPEN D955 AND L961 AT S1 TERMINAL OF T902. (PCB-POWER) D955 PART #264P102040 L961 PART #411P012010 4. CHECK FOR DEFECTIVE IC401. IC401 PART #272P239040, OR INSTALL PT# IC-401, THIS KIT CONTAINS CAPACITOR C920, D4000 AND IC401. BE SURE TO MOUNT C920 ON FOIL SIDE OF PCB. 5. EXCESSIVE 130V SUPPLY. CHECK C911 47 UFD 100 V AND C914 47 UFD 50 V, IN THE IC900 CIRCUIT. Good Luck, big IRISH.

Aug 21, 2008 | Mitsubishi WS-55807 TV

1 Answer

Tv problem


Good Day;
Sounds you have a bad vertical output IC that is defective along with some caps. Change IC > LA7838 > IC401 and ALL CAPS like cap off of pin #6 1ufd 25v and etc.
Good Luck, big IRISH.

Dec 12, 2007 | Mitsubishi WS-55807 TV

1 Answer

Toshiba TV


vertical deflection problem. Vertical output IC, pump up cap, power to output problem, bad connections, jungle IC. Its a good idea to replace all electrolytic caps near the output IC. Bad caps cause it to run hot and self destruct.

Oct 29, 2007 | Toshiba CX36F84 TV

1 Answer

Horizontal line May 03, 2007 Toshiba manufacturer; Good day, my problem is a black screen with one horizontal line at the center of the screen. the power supply is good and the horizontal ic is...


Olao,
Your symptoms suggest that your vertical Ic401 has failed. In your Tv that Ic is a LA78040N-E Toshiba p/n# AE002783. Also it would be wise to test the feeder caps in that circuit, especially anything in the 100uf range.
This is not an expensive repair for a qualified shop. The Ic is under $20.00 dollars and caps are a buck or two - the labor will be your most expensive element of the repair and it shouldn't take an hour start to finish..
Hope this helps!
Bill

May 03, 2007 | Toshiba MD20F51 20 in. TV/DVD Combo

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