[TV] Re: Magnovox PTV843 dead LED on

[Mike <mbates17@xxxxxxxxxxxx>]

anyone have the schematic to the large signal panel. I am chasing my 
tail on this one....

-----
Mike


Mike wrote:
> just got back from looking at the set. the main power supply will not 
> start, however it is getting the startup signal from the signal module. 
> all standby voltages are present where they should be, 12v present at 
> proper points on the cold side controller IC. I found one bad capacitor, 
> it was bubbled up, 470uf, 25v off near the shutdown IC. replaced this. 
> checked both the HOT and HVOT, they are fine. tested all diodes in the 
> circuits and they are also fine. no signs of burned resistors, all SMD 
> transistors test A-OK.
>
> I replaced the cold and hot side controller ICs with ones i found on 
> another board i had laying around, but it still wont startup, and theres 
> no telling if those ICs were any good either so i might have to just get 
> new ones and hope for the best. ESR test of all the caps indicate they 
> are all A-OK.
>
> any ideas? thanks.
>
> -----
> Mike
>
>
>
> Mike wrote:
>   
>> buddy of mine called me up about one of these, no picture, no sound, LED 
>> only. i think ive seen this chassis before, not sure. is it similar to 
>> the PTV800/PTV810?
>>
>> -----
>> Mike
>>
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