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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Have you checked all the cathode voltages (Rg, Bg & Gg)? If not check it. If the Gg voltage is found much less than the other two cathode voltages, the fault might be to the green video output transistor, or its collector load resistor. In service mode too, there are adjustments. All of it cannot be stated here. anyway, check the above stated voltages first. CRT cathodes are negative biased, that is, if the voltage at the cathode become low, the intensity of color to that cathode too. If you wish to get more details, come over by comment. To get more details,

Nov 16, 2013 | Televison & Video

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Toshiba tv model 32zp18q playing up.

The power light may be flashing or if you are runing with a series light bulb it may be cycling on and off continuously. There may be a chirping or clicking sound from inside the set. (Note: using too small a series light bulb load during testing for the size of the TV may also result in this condition.) If there is a low voltage regulator or separate switching supply, it could be cycling on and off if the horizontal output, flyback, or one of its secondary loads were defective. Does this TV have a separate low voltage regulator and/or switching power supply or is it all part of the flyback circuit? For the following, I assume it is all in one (most common). Some simple things to try first: Verify that the main filter capacitor is doing its job. Excessive ripple on the rectified line voltage bus can cause various forms of shutdown behavior. An easy test is to jumper across the capacitor with one of at least equal voltage rating and similar capacitance (make connections with power off!). Use a Variac, if possible, to bring up the input voltage slowly and see if the TV works at any point without shutting down. If it does, this could be an indication of X-ray protection circuit kicking in, though this will usually latch and keep the set shut off if excessive HV were detected.

Hope that helps........

Jun 23, 2008 | Televison & Video

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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


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.
If you need any more assistance, feel free to contact me through Fixya. Ok.

Dec 07, 2010 | Panasonic TC-21Z88R 21" TV

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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

Nov 24, 2010 | RCA 20F512T 20" TV

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...


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

The color sometimes bleeds and takes over the whole picture. I have to change channels to ge it back to normal - it happens on any channel - none in particular - it is only 4 years old

You are reporting about color "spreading" I thinks. That is colour spred like taills along with picture. Red colour will show it more. There are 2 main couses for this fault. The first one is picture tube aged. The second one is low video output drive voltage. As your TV is new [I can say as it is only four yerars old], the second stated may be the fault.
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Keep children away from you, when you open the TV. Be caucious, as 25KVDC [25,000VDC] points are there inside your tv. Keep an adult beside you as a precaution. Never touch any internal part of the tv while it is switched on. Plug it out from the mains socket before doing any componet replacement, except for voltage measurements. Do wear a plastic or rubber footware when you work, and never use a metal chair.

Oct 20, 2010 | Sony KD-32FS170 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.

Apr 18, 2010 | Sony FD Trinitron WEGA KV-24FS120 24" TV

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Sony Trinitron Vega KV-34HS420

it's better if you bring you're tv to sony service center and ask to an authorized repairman

May 07, 2008 | Sony FD Trinitron WEGA KV-32FS120 32" TV

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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

Problem with sony tv

Define serious and simple.. Just teasing... John what you have is called a pincushion problem. In that particular model I'd check the following:
C530 .0022uf
R530 15k
R532 4.7k
and Q503
If you're not too technically inclined try this. Remove the main board, called the "A" board. Take pictures if you have too to refer to later when you re-install the board. So you know where all the wires go. Then carefully box it up and send it in to tri state module.. For approximately $129.00 plus your shipping costs getting it to them they will rebuild the board and ship it back with a one-year warranty. Re-install the baord and problem solved.
On the other hand, knowing that Tri State will rebuild it for that cost call a few shops and ask what they charge for repairing the pincushion problem, can't hurt.
Tri State's web is:

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