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When power applied tv just pulses as if trying to switch on but not completing its power on

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Re: When power applied tv just pulses as if trying to switch on but not completing its power on - Projection Televisions

What make and model set do you have?

Posted on Jan 20, 2008

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My panasonic 1080i tv will flash green for approx 100 pulses then switch to red

A model number might be helpful here as a lot of different sets with this name with different issues.

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Sony kdf 50e standby light flashing 2 pulses

If your tv is Sony KDF-50E2000 model then 2 times standby light shows problem of over temperature in tv. Check temp sensor in tv.
If model number is different, let me know complete model number written on label at rear of tv to help you out.

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Tv shuts off after screen goes red

Good Day sir, the reason why your tv act that way is the switching power supply. The power supply regulator, cannot supply the current needed by your TV. these can be caused by several factors. a faulty switching regulator, low power, or filter capacitor leaking, check the voltage across the VCC after the regulator, if possible the switching transistor. and the ic that controls the pulse they are usually near each other. for safety reasons, better consult your service personnel. hope this helps. if you need more assistance, do let me know. thanks

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ALL the next is with the tv unplugged (NO NO power)
  • resold the jungle (video processor) all around
  • following the horizontal drive pulse path and arriving to the horizontal area just after the horizontal transformer and in the base of the horizontal DRIVER there is a electrolytic capacitor (if this chassis uses this one,) Change it (maybe is dry)
  • solder all components i just told you in the last step. horizontal driver, transformer, etc
  • remember:
  • if a transistor is blowing with no reason (there is a reason: the collector receives 130 volts but cannot hold it forever, It has to be in some place. if the switching pulse doesn't arrive to it the transistor throws this 130 volts and burning itself. i hope it is help full.

Apr 15, 2009 | Projection Televisions

1 Answer

High pitch pulsing & picture now

I would check the set for bad connections. The high pitched sound you are hearing is the high voltage section. If the convergence IC has completely failed, that can cause this as well. Try using STK392-150 or STK392-180. Either one will sub since they are pin compatible and they both can handle more power, thus should last longer. Also, make sure that you use plenty of the heatsink compound when mounting these.

Jun 26, 2008 | Philips 43PP9202 43" Rear Projection...

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THe standby light will blink a code that should be a repeating code. Please post the count here as that indicates which circuit has the fault. That info coupled with the model number above will allow us to explain what is broken and perhaps what parts need to be changed to fix it.

Jun 06, 2008 | Sony KP-41T65 41" Rear Projection...

1 Answer


Sounds like your convergence chip has gone bad. Usually costs about $300-$400 to fix. I would call a local TV repair shop and let them give you a free estimate.

Jan 29, 2008 | RCA D52W20 52" Rear Projection HDTV-Ready...

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