Question about RCA F38310 38" TV

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Need "low voltage board"

I may be gettin one of the above tv's later today at no cost. However, the gentleman states that it needs a "low voltage board"???????????

Where can I locate one and approximately how much are they?

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He might mean a power brick (transformer)
If you live in the uk then Maplin Electronics might help
If you live in the us then Either Walmart or Radioshack might help

Posted on Mar 26, 2008


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My Panasonic TC-21Z88RBN doesn’t displays the total picture vertically ,when the picture is display it like not in the center of the screen sum of it is disappear in the bottom


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If all soldering point are fine, come towards the IC legs and measure the voltages at each leg. The voltages must be
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I have a RCA mod. 20f512t cx51 20" flat screen tv.

There is some short circuit on the circuitboard of your TV. The smoked transistor like device is a low voltage regualtor integrated circuit [IC]. There is no 5VDC rail on the circuit board. The component you specifies may be a 5VDC regulator. If it is so, there must be a reason for its failure. Without this 5VDC rail, there will be no standby light. Its system control section won't work, as it have 5VDC to be into. You jusct check for some short on the 5VDC rail. There will be markings on the printed circuit board about the pins of that IC. It will have normally 3 legs, out of which one is marked as input, and other one as output and the third will be ground. You just find the output pin of that IC, resolder it out from the board, and measure there is any input voltage coming to its input pin without replacing it with an other. If not, collow the inout track to that IC, and find out the origin of that woltage. Usually it will come from the any one of the secondary windings of the line outout transofrmer {LOT}. If so there will be a series low value resistor will be there, check it for open. If there is input voltage already, check the output side for any short. In some cases, ceramic capacitors, if fitted across the 5VDC rail has a chance to get leakey, which in turn put a heavy load on the above said regulator Ic, and that may be the reason for its burning. Anyway, there is no 5VDC rail inside the circuit board. Check for it. If you wants any more clarification, ask me through Fixya, stating your findings, and your doings. OK

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Sorry if this posts twice. I think I might have posted an ealier question in an improper area. I have a Sony Wega 32" Trinitron Model KV-32F S200 (Year 2003) Recently, I've been getting a Green...


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1 Answer

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Part numbers

your gonna need to get a schematic as I dont have one. To properly troubleshoot this set . Also its not a job for an end user unless they have solid state repair experience. As it States in the owners manual "There are no user serviceable parts inside this set". Thats because there all soldered in. Then we have to look at the serious danger of the HI voltage we find inside these sets even after they are unplugged. now ,if you know about all the safty issues and you get a service manual, you find the parts that are bad, you can go to and they carry every single part for this set. if you need a main board assy, its cost is about 549.00 and the power supply board is about 170.00.. This is the boards need to be checked, as the replacement of complete boards exceed the cost of the set. Good Luck.

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