Question about RCA F35731MB 35" TV

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My RCA F35731MB will not turn on. there was no other problems before this. its not the power button as I can hear the click when button pushed. I work on computers and laserjet printers and have worked on monitors so I know how to avoid being shocked and feel confident about replacing any part in tv. I just need to know where to look for power supply info and how to replace it.

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It is very give you advice as you are aware of it. So do one thing. As far as the device is not turns on its power, the fault should be somewhere around the power supply system. Begin from AC mains chord itself. Check it for any break. If it is Ok, check whether supply is comming inside to your TV. Normally TVs have DPST type [Double Pole Single Throw] switches used for power switching. If any one of its poles not get correct contact inside, either phase or neutral will be cut. The click sound is not considered for its correct function. Check it also. It can be ckecked by measuring the voltage comes at rectifier points of your TVs power supply regulator section. If there is voltage, check the DC voltage across main filter capacitor. It must be some more than of your supply votage. I don't know the exact voltage you have as mains supply. Here in Idia, we have 220VAC 50Hz. At this supply voltage, DC voltage said above will measure more than 340VDC. Get a comparison with this when you check the voltage at the point mentioned above.
If it is also ok, there may be some fault in the oscillator section of the SMPS [Switched Mode Power Supply] section. There may be transistors or an Ic may be used to make oscillation to drive the switching transistor, which in turn drives the swiching transformer to get proper secondary low DC voltages needed to the circuit board. Check all the transitors. Of optocoupler is used check it also. Check its DC side control drive transistors.
Check all the zener diodes "off circut". ie take it out desoderd and check it with multimeter [preferably analogue type], set to 100K range. There should not be any leak at all. It is best to replace them.
Check all the resistors for its value marked, and all the transistors either for short or open.

Posted on Oct 25, 2010


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