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Technosonic LCD3251 TV stuck in standby

As soon as I switch on it just stays in standby with red LED. No visible swollen caps or damage on any PCB?

Posted by Phillip Thorne on

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Anonymous

  • 541 Answers

SOURCE: Technosonic LCD1908 stuck in standby. Does not

There are several things that must happen before a DLP will turn on. The light bulb and color wheel must start first. Samsung had some color wheel issues. Check the bulb first. If it is good, most likely it is the color wheel.

Posted on Oct 14, 2009

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The power supply board 2950c is driven by a Fairchild CM0765 power converter which is a MOSFET combined with PWM controller. This board is used in several different LCD TV's. It should output 15V at 2.5A. You can find a troubleshooting giude here http://www.fairchildsemi.com/an/AN/AN-4141.pdf
If the fuse is not blown, and the 3 output caps are not swollen then usually the capacitor C4 (Vcc Capacitor) is faulty. It is usually a 22uF 35V Electrolytic and you wont easily see if it is faulty - you need a cap meter to test it, or just replace it with a 47uF 50V and it should work.

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Technosonic LCD3251 TV remains in standby


Sounds like a signal board issue to me.... If your power supply lines are fine.... Seek a good one on EBAY or shopjimmy.

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Could be power supply failure. Capacitors can be defective without visible indications.

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Sony KDL46V2000 TV. Screen comes on and goes off in continuous cycle


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Technosonic LCD1908 stuck in standby. Does not appear to be flashing red LED as other posts mention. I have no remote. As soon as I switch on it just stays in standby with red LED.


There are several things that must happen before a DLP will turn on. The light bulb and color wheel must start first. Samsung had some color wheel issues. Check the bulb first. If it is good, most likely it is the color wheel.

Oct 14, 2009 | Samsung DLP HL-P4663W 46" Rear Projection...

1 Answer

Unable to stay power-on


Have already posted this fix twice, but to be sure hunglam_1999 receives notification, doing so again 27Oct2009:

Most common failure is the audio amp IC, reference # Q5001, which is an STK402-950 (Onkyo Pt. # 222123). Typically fails as a result of excessive volume levels or as a result of problems with the speakers or their wires. If you're technically inclined, the part can be had from various vendors & is fairly straightforward to replace once the complex disassembly required to access the PCB this IC resides on is accomplished, using standard soldering skills. A repair of this type by a reputable servicer may be more effective for non-technical folks, as typically can be accomplished for $200 or less, much less than replacement cost...

Oct 05, 2009 | Onkyo LS-V955 System

1 Answer

Red LED standby button is blinking red. Amplifier is switched on and after some 5 secs switches off on its own with red LED still blinking. If OFF on remote is pressed red LED stops blinking, however...


There is a problem win the power supply. I would look for swollen/leaking caps and also any cracked , broken devices in that general area and replace them

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