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I have a toshiba tp55g90 projection tv and i need to know if c840 is the only thing that would go out if i have a blinking light

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  • duwop56 May 09, 2010

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These sets have a shutdown circuit and a problem almost anywhere in the set can trigger it. The blinking light means it is in shutdown. To be honest the most common reason for this is a failure of one of the two STK-392-110 convergence chips that takes out a 5 amp pico fuse associated to each chip. The fuses with the set unplugged can be tested like any fuse (they are usually green or orange in color and look like a 1/2 resistor) . The set will have seven or more of these and most are in the power supply. A open or blown one will be detected by the shutdown circuit as a voltage is missing and you get the blinking power light. SD TECH

Posted on May 09, 2010

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I have a large projection toshiba tv. When I turn it on the red light indicator blinks but tv screen does not go on. Please help and let me know what I am doing wrong. Thank you.


one thing you may try first is disconecting the tv from ac outlet and plug back in ater 20-30 seconds, try to power back on. If nothing happens you're not doing anything wrong it might be that the tv needs circuit repair, the light blinks and you get sound indicateds a possible deflection board problem either horiz out transistor or surrounding circuit if you only get the blinking light no pix or sound could be also indicator of defl circuit failure or switching mode power supply acting up.hope this helps please let this site know if your question was answered.

Aug 22, 2009 | Toshiba Televison & Video

1 Answer

TV turns off and power light blinks unpluged andd still does it.


Likely to be the STK convergence chips causing a protection circuit to switch the TV off. Have you got any onscreen convergence problems (i.e, colour fringes)?

May 27, 2009 | Toshiba 42H81 42" Rear Projection...

1 Answer

Power light is blinking TV does not turn on


the power is blinking because there is a deffective parts... the supply that makes oscillation of tv has been cut off... either the horizontal transistor is open or the resistor from the abl change its value...if you have knowledge with the parts maybe you can try... only the qualified servicemen can repair the problems...

Aug 29, 2008 | Sony FD Trinitron WEGA KV-27FS120 27" TV

1 Answer

Convergence IC keeps going out


Did you replace the resisitors that power the ICs? Usually 1 or 2 of them go open when the ICs go out, and if you dont change them they will take out the new ICs .

Feb 29, 2008 | Toshiba TP55G90 55" Rear Projection...

2 Answers

Power indicator light blinking


Check soldered in micro fuses...F850, F851 etc.....
1) solder jumper wires on signal board = 008,010,017,048,600
2) Check / replace STK392-110 convergence IC's with Toshiba
part # 23135090 or upgade to Hitachi part # CZ01341
Let me know....................T.

Jan 04, 2008 | Toshiba 65HX81 65" Rear Projection...

1 Answer

Screen removal


1) Remove lower,front speaker grill
2) Remove screws along bottom edge of screen frame
3) Lift screen assembly off cabinet
4) Lay assembly face down
5) Remove just enough frame screws to get back in position--
    Don't force it----
6) Reassemble.........T.

Oct 28, 2007 | Toshiba TP55G90 55" Rear Projection...

1 Answer

Power light is blinking TV does not turn on


Mosy likly the regulator Ic in the main power supply . Not a consumer replaceable item because of xray and safty issues Call in a shop to assit you in this matter. Good luck

Jun 14, 2006 | Toshiba TP55G90 55" Rear Projection...

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