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Model #24PT6341/37 Phillips shut down

Need your help once again group - set turns on, high voltage comes up, get raster, and about 4 seconds later shuts down, but green power LED on front stays lit. Can power off and back on, and the sequence repeats. I've checked almost every cap, diode, resistor, and found nothing wrong yet. Tried freeze spray also, but it doesn't seem to be temp related. I suspect a shut down circuit, but I don't have the schematic to troubleshoot. The B+ drops about 7V after power up, otherwise is pretty stable. Anyone have experience or knowledge on this particular model or problem? Thanks for any help.

Reply to
stokesbr
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I am not familiar with your particular model of TV. I can give you a generic approach.

Did you use an ESR meter to check the caps??? The ESR spec is very important!

I have had defectieve high voltage multipliers in TV sets also cause what you are describing This part is usualy part of the flyback assembly. In some models of TV sets it is a separate module. In the case of this module going defective, the power supply can be put in to the protection mode.

If there is a scan failure or some area that is pulling too much current this can cause the power supply to go in to the protection mode.

I would guess you carefully inspected the set for any cold solder connections and any connectors that are not making proper contact.

The other solution would be to get the service manual from the manufacture's parts distributor and spend the time to troubleshoot the set with a DVM and scope.

Jerry G.

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Reply to
Jerry G.

t -

Sorry for the late reply, and thanks for the info. I have not checked ESR on caps yet. I don't think my old Sencore checks them in circuit, which makes parelleling as easy, but not sure where to focus. I have suspected a shutdown circuit, but without the manual, I can only check component to component. I will have to find a schematic, and dig deeper. I have checked and resoldered many joints, but no change. I'll post an update. Thanks again for the info.

Reply to
stokesbr

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