Toshiba TV model CX2780A is dead


  #1  
Old 12-18-02, 10:14 PM
paulbenoy
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Toshiba TV model CX2780A is dead

Hi, My Toshiba TV (model# CX2780A) is dead. When you press on the pwr button, the relay clicks and nothing happens. I found out that the horizontal transistor - Q404 was shorted (part# D1428). After replacing the transistor, the TV tried to turn on, but it turned right back off again. The new transistor is bad now. Something else is causing the transistor to go bad. What else could be wrong?
Pleas help me....

Sincerely
Benoy
 
  #2  
Old 12-25-02, 07:03 AM
FREDDYG_001
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This is where a variable power supply is needed to drop the ac line down to 90vac to troubleshoot. Sounds like the flyback is bad.
You also need to see what the power supply B+ is, thats going over to the flyback and the collector of the H.O.T. Remove Q404 and see what those two pins have.


Fred
 
 

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