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I have a problem with tcl model 2027u. The vertical ic easily gets hot and will explode after several minutes. All the voltages in the vertical circuit seems to be normal. I replaced the def yoke, the rectifier diodes, and the ic itself, including the jungle ic but the result is still the same. I appreciate very much if you can help me solve this trouble. Thanks. Elvis

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I don't have the circuit diagram in front of me, but I would suspect a shorted or leaky capacitor in the output circuit. Another possibility is that the heat sink is inadequate or something is amiss with the thermal interface between the IC and heat sink.

Is the vertical waveform normal? Put a convergence pattern up and see if the grid is linear from top to bottom. This could give you a clue.

Posted on Mar 11, 2011

  • Paul Bade Mar 11, 2011

    Two more possibilities: there may be a conductive burn track in the circuit board in the vertical deflection circuit area. This could be putting an additional load on the IC. If you find this, you get to play dentist - mill out the burn track, (it will be softer than the good material), clean off any carbon residue and fill it with epoxy.

    Another possibility is that the vertical IC comes in multiple versions with different voltage and current ratings - the only difference in part number may be a letter or number in the suffix. If this is the case, you may have installed one with too low a current rating. To check for this, download the datasheet for the IC (search for the part number AND "datasheet").


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