TV guy 1966
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Feb 14, 2007, 11:44 PM
Post #4 of 12
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Re: [demo] Philips 60" model 60p8342
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I'm sorry, with you saying you have sound I assume you had standby supplies and you had turn on with a red light on the power button lit? If you have turn on and no High voltgage you need to see or hear in this case if the switch mode power supply is firing up at turn on. If you have sound coming out of the tv with your signal hooked up then you smps is working. If you don't have sound try to hear the smps firing up with a chirp(if you worked on tv's before you know what I mean) If you have chirp then you may have a vertical problem. If no vertical deflection the high voltage will not fire for safty issues. When you looking at the board find the vert. output. It is on a heat sink to the very lower left of the module. Now look directly ahead of the vertical circuit up past the heat sink your see a small transformer that is driven by the horz. sweep of the unit just to the right of the heat sink. Two supplies are derived from this supply +&- 18volt b+. The b+ is fused with two fuses just ahead of the transformer just follow the circuit. To trouble shoot remove all screws from the chassis frame to the bottom part of the cabinet. Pull out the light sheild just in front of you. Pull the chassis back to you and raise the front and slide it up toward the front of the cabinet and raise the back half up to access the printed circuit side of the modules. If one of the fuses are open your output is defective, replace output and fuse to correct. If the fuses are good then output is good and we to move on. Do this and get back to me.
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