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[TV] Re: Magnovox PTV843 dead LED on
Yea, and i just found that out last night. thats what failed in this
one. why though...
-----
Mike
John Peters wrote:
> Is this the one with the 3 optocouplers at the rear of the chassis? The
> large one fails all the time. I have changed about 15 of these.
>
>> 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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>
>
>
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