CTC169 36" dead

Mike · 2007-01-27T03:13:37+00:00

Got this set, it would turn on and fire HV for a second, then shut back down. it wont do it anymore, only did it one time.I monitored C4118 while pressing the button, it would start off at 13.1 volts, and drop down to about 5 volts. when power button was pressed.I then replaced CR4118, and replaced 2 caps in the IC chip of the power supply. the main B+ at standby levels is about 143vdc. the 15v standby is about 13.3 still.but this time, when you press the power button, OR perform the manual power-on, bypassing the micro unit, the voltage doesnt drop anymore, but the set still is dead. HOT is fine, chopper is running. I dont know what to look for next.however if i hold the board in manual power on, every once in awhile the degauss relay would start clicking on and off a little bit, very faintly, like a weak supply somewhere.any ideas?

CTC169 36" dead

Jan 27, 2007 24 Replies

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Ken Weitzel 19 years ago

Hi..

When it won't turn on (with audio disconnected) take a look at pin 22 of

1001. If it's more than 1.5v, something else is in protection mode.

Take care.

Ken

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Mike 19 years ago

well then it has to be a cap or somethign liek that. because when it does turn on, it plays beautifully. perfect pictuer. just no audio. ;-)

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Mike 19 years ago

ok i replaced the last 2 capacitors on teh secondary of the main SMPS unit, the set now comes on and works every time. YAY. finally. but the audio is dead. as soon as you plug in that little conenctor, to power up the audio amp, set wont start at all. no horiz pulse, like before. the power supply is smooth now. at least until you plug in the audio connector. then the power supply loads down again.

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Mike 19 years ago

i need a cross reference and/or schematic/datasheet to the audio out IC. only markings on it is 51135, assuming a factory assy run number or some cryptic code.

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Meat Plow 19 years ago

On Mon, 29 Jan 2007 22:24:45 -0500, Mike Has Frothed:

TDA-7360?

formatting link

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