Question about Projection Televisions

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Hi there, i have a philips 37" lcd tv, model:37PF7320/79.When i switch it on the tv swiches itself off and on also a clicking sound can be heard (coming from the power board), ive also noticed the main board with all input plugins has a green led light blinking on and off also.Now ive managed to stop this wierd behavior by timing the clicking and pressing the programme or power button to make the tv stay on, but the screen doesnt power up and the sound for a tv channel is very faint, but the led on the main board is still blinking on and off, PLEASE HELP !!!

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  • vitto187 Jul 02, 2008

    Hi there, i have a philips 37" lcd tv, model:37PF7320/79.When i switch it on the tv switches itself off and on also a clicking sound can be heard (coming from the power board), ive also noticed the main board the one with all input plugins has a green led light blinking on and off also.Now ive managed to stop this wierd behavior by timing the clicking sound and pressing the programme or power button to make the tv stay on, but the screen doesnt power up and the sound for a tv channel is very faint, and the green led on the main board is still blinking on and off, PLEASE HELP !!!

  • vitto187 Jul 02, 2008

    Hi there, i have a philips 37" lcd tv, model:37PF7320/79.When i switch it on the tv switches itself off and on also a clicking sound can be heard (coming from the power board), ive also noticed the main board the one with all input plugins has a green led light blinking on and off also.Now ive managed to stop this wierd behavior by timing the clicking sound and pressing the programme or power button to make the tv stay on, but the screen doesnt power up and the sound for a tv channel is very faint, and the green led on the main board is still blinking on and off, PLEASE HELP !!!

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Its the power supply problem
it is very common in lcd tv,
they are repairable ,check whether any bulged capacitor is seen on the board ,replace it ,if not familiar with soldering do not try to do it your self a local technician can do this the cost will not more than his service charge.

feel free for further assistance rate the solution as fixya if this helps you to solve your problem.

Posted on Jul 02, 2008

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Following comment found helps.
Most LCD faults experienced are of two types
1 Dead (Psu faults)
2 Display Panel Faults

1 Dead NO pic or Snd
Some have external power units, the ones with a 4pin plug are usually the fault
even if they measure +12v coming out, test by substitution

The Psu are Just like any Psu using SMPS(chopper), so use normal PSU fault finding techniques
Start with , Any power from secondary of chopper transformer, at the diodes)
usual PSU voltages are 5v,3.3v 12v (the 12v feeds the CCF tubes power generators)
If yes the psu ok, If no check for 320v across mains smoothing capacitor
If 320v ok but no output, check for shorts on the output lines (schottly diodes)
If the PSU is running and there are any leds glowing on the front
check to see it the flurecent tubes (on each side) are glowing
they usually have their own supply generators powered by 12v from PSU

Ps anyone know where to get:- schottky 120v 10a double diodes t220 case or similar?

2 Display Panel faults
Vertical (source) faults are usually within the actual panel (Lines/Bands down Picture)
Horzontal (gate) faults are unually within the actual panel (Bands/Lines across the screen)
All faults that are within the panel aren't repairable (I know specialist repairs are possible , But the COST)
there is a firm calle D'lec why not ask them for a price



Permanant Missing or Lit spots are often found , and are normal (most screens have a few)
For actual usual faults check my online database for your actual make/model (if any)

Posted on Jul 02, 2008

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Hi

This power oscillaion trouble! vitto187 if you have experience in electronics repairing i cant teach you how to fix this problem... the problem is the oscillation circuit thats why the power on and off....

Thanks!

Posted on Jul 02, 2008

  • carlos fernandez Jr.
    carlos fernandez Jr. Jul 02, 2008

    sorry for wrong spelling, i can teach you!!!

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This a same problem which i have als o felted in the cold seasons this may be due to the failure in the circuit

Posted on Jul 02, 2008

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