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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There is no picture when TV is turned on and all you hear is a faint chirping sound. Sounds like something is trying to restart. There was an issue with our cable, once it came back on later in the day the...


The problems ur tv having is also parts of the tv Convergence board are dead,but it is totally dead to causes this problems,if convergence board it still have some functions left.Tv will only have colors R,G,B will mis alignments,have colors shadows pictures and 3D pictures look alike,but convergence board are not getting any voltages at all that why u just hearing faint chirping noises that it.The tv convergence board,must require to changes 2 STK convergence ICS and some or all of it resistors too.For the covergence board have fully functions again to solved this problems.The shop will cost u like $300-350 for parts and labors.

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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


Hello

Your TVs vertical output section has the fault. You just open your TV after disconnecting it from the AC mains wall socket, and locate the vertical output section. This section uses an Ic marked as part [IC 401] on the board and its number is LA7840. Just look for any loose soderings around its components legs, and the solderings at the IC legs, which has 7 of them. The IC stated above will be screwed onto a heatsink to radiate heat out of it when it works.
If all soldering point are fine, come towards the IC legs and measure the voltages at each leg. The voltages must be
pin 1= Ground
pin 2= 12.6
pin 3= 24.7
pin 4= 4.4
pin 5= 4.4
pin 6= 24v [vcc]
pin 7= 1.8
All voltages stated above are DC voltages with respect to ground. If any of this voltage is missing, find out the reason for that. If all of them are noted abnormal, IC may be defective, and replace it.
[vcc] stands for main input voltage to the IC.
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Dec 07, 2010 | Panasonic TC-21Z88R 21" TV

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I have a RCA mod. 20f512t cx51 20" flat screen tv.


Hello
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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1 Answer

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...


Hello

There are two causes for this problem. One is related with green output transistor, and the other is to chroma Ic. The most common cause is with the transistor said above. You just check the video output voltage points at picture tube base board. There are three cathodes may be marked as R,Gand B. In trinitron picture tubes, these pins are pin number [8 Blue KB], pin number [9 Green KG] and pin number [10 Red KR]; and the voltages must come approximately equal to KR=154, KB=155, and KG=163, and the main video output voltage goes to these transistors will come around 225VDC. These are not accurate voltages tor refer. It may vary by 2% to set by set. All the three transistors used will be identical in number, and usually found 2SC3271N. In your TVs case, green cathode voltage may be very low from the fault stated above I thinks. When cathode voltages goes low, emission of that cathode will increases, and colour of that cathode will be predominent. You just check these voltages, and check the main video input voltage said above too. There are three resistors of 2W fitted to the the main video voltage and collector of each transistor said above; and if any one,say the resistor fitted to green output transistor collector is faulty, or open or loose sodered, the voltage at the green cathode [pin-9] will be low causing this problem. If the transistor said above gor a leak with collector to emitter will also may the cause.
Just check it. Normally this base card of Sony TVs are marked C board. If all the transisors are found okl, and still the problem perisits, the fault must be in the Chroma Ic. It may need replacement.
In practice,I found this fault to be due to bad solderings in the base card. You just check it first and go forward.
If any doubts, contact me through Fixya. OK.

Nov 10, 2010 | Sony FD Trinitron WEGA KV-32FS100 32" TV

1 Answer

2 of my 7 sony tv's have started blinking on and off, but after unplugging for 2 months one stopped blinking for awhile but started again. how do i fix these tv's? models kv-27ts32 and kv-24fv12


You cannot fix these by yourself. You'll simply need to call in a Sony-authorized Techie and pay the gentleman his asking fee to diagnose and repair your TVs. It sounds like the flyback transformers are about to say "bye, bye" to you, and this is normal. Sorry to hear about these unfortunate circumstances but nothing in life is guaranteed to last for ever. They do quit sooner or later....Especially the nicer ones! And it may not be worth the cost to repair them.

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My TV will not fire up - the red LED light keeps blinking - 5 times-pause-repeat. Make : Sony Bravia Model number : KLV46V200A/TH6 Can someone please help ? Thanks in advance !


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Mar 19, 2010 | Sony BRAVIA KDL-40S2010 40 in. LCD...

1 Answer

Wife spilled water on back of television


You burned out a resistor, capacitor or possibly a printed circuit trace on the solid state printed circuit board. This is going to take some troubleshooting in a high voltage area. If you have no TV repair experience working on high voltage circuits and solid state printed circuit boards, play it safe and have a pro take a look at the set. Good Luck

Feb 11, 2008 | Sanyo HT27546 TV

1 Answer

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 http://www.partstore.com 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.

Jul 02, 2006 | Toshiba TP50H50 50" Rear Projection...

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