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Equipment Repairs => PLASMA TV forum => Topic started by: jose almeida tavares on November 09, 2014,06:53:48

Title: SAMSUNG PS-42C91H no stby lewd
Post by: jose almeida tavares on November 09, 2014,06:53:48

Hello, this tv no led power. the 5v stby exist. help plase.

Title: Re: SAMSUNG PS-42C91H no stby lewd
Post by: downunder on November 09, 2014,14:49:29

Hi Jose,

Any bulged caps on the power board. In particular, check CS814, CS815, CX835 and CX835.....all 2200uF 10V          Bruce

Title: Re: SAMSUNG PS-42C91H no stby lewd
Post by: leonard085 on November 12, 2014,07:53:31

To test the power supply on this model
First as previously mentioned, I check for bulging caps,
then I check for the st/by 5V, which you have present,
I then short out  the control line on the power supply "ps on" to any ground point
 on the secondry side of the psu
This should take the psu out of st/by, you will then be able to test all the supplies

The plasma screen on some Samsungs will operate without the  signal pcb connected
To do this
remove the connecters between the signal pcb and power supply
short out ps on to ground
then there is pins on the control/logic pcb, short these together
now plug the unit into mains, if the screen now has a raster, this confirms the
power supply, and all the screen drive pcb's are ok,
I would then start looking at my signal pcb, also check the supply voltages to this pcb,