I believe the capacitors (several) are burnt out. The P/S board has black tar-like stains on it near several capacitors. The tv will not turn on anymore. Can I buy a new / refurbished board or do I have to take it to a repair shop. I believe Astar is out of business.
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Typically if one inspects the boards in question you may find evidence of heating and damage.
Sometimes with newer solder having no lead, hot spots tend to leave cracks around the joints of parts heating and cooling and once they arc they fry components. One can usually smell a burnt component altho hard to describe the smell. I would look for burnt fuses on the power board where the power first enters the back of the tv, and some fuses are covered with a plastic sheath and looks like another type of component. A tester comes in handy...
I suggest that you look more at the board that gives the high voltage to the TV screen, as there are step up transformers (square blocks) that give a lot of trouble and the transistors surrounding those blocks, usually 4 transformers. I would test for continuity around these areas but the transformers should be pulled from the board for a more accurate test.
Inspect transistors (black with three prongs) usually has an aluminum heat - sink attached to it for cooling, anything more than 3 prongs is probably an IC or integrated circuit chip. These are more difficult to test. A diode will allow power one way but not the other so reversing the polarity tester tips will give you a voltage or nothing in reverse. Transistors are similar to a diode in that you can test it one way but it shouldn't be a reading the other to try to keep things simple.
Typically when a transistor goes it will burn a hole in the face or on top. A capacitor looks like a mini soup can and swelling on top a hole on top or liquid stain under it is an indicator that it's bad. Typically the top is swelled and the plastic coating bares most of the top of the capacitor. If one inspects other capacitors in that area you can notice the difference even though indicators are slight at times.
I would at very worse put the screen part away until you found a suitable tv model with a broken screen perhaps on kijiji. Typically it is a capacitor that has blown but may only lead to a partial solution to the problem if several parts are gone which is usually the case, a capacitor or two as well as a transformer or a transistor; and one must also inspect and test other components in that same area for success and to inspect the circuits for cracking around components especially where the hot areas are and one can usually see these hot areas due to the discoloration of the board in these areas. These hot areas are usually the problem.
One overall solution is to build a big fan into these tv's lol and put surge protector bars on all your expensive electronic components.
First thing you should do is to invest in a really good surge protector for your TV. Then when you replace the capacitor again use a good capacitor. Cheaper is not always better. Rubycon seems to do the best for me. There may be other suggestions, however I have the best luck with them.
Hi, It sounds like you have an electrolytic capacitor that blew up( can be a bit noisy ) it'll more than likely be in the power supply section somewhere-it's not totally dead hence the blinking light ( which is a fault indication ) The bad component should be visible by possible signs of swelling on the top,( silver colored) a rubber seal on bottom being pushed down around the two metal leads near the circuit board , or even some brown discoloration around the faulty component/s,( it does not have to be a capacitor) I have heard integrated circuits pop before ( they will almost always leave a smoke stain near where it occurred ) also there may actually be a small hole in the faulty part. I hope this helps, Make sure unit is unplugged before servicing, good luck, Prodzilla
that tv is very common for power supply failures. there will be several bulging vented capacitors on the power board. the capacitors are used for filtering in the power supply so they would smooth out the ouput of the certain switched supply circuit they are part of. easiest way would be to replace the power board otherwise with some minor soldering skills replacing the capacitors is cheapest route. the capacitors are near the top right corner of the power board which looking from the back of the tv is the board on the left. usually there are about 5 capacitors total that need to be replaced.
The backlight invertor seems to be defective.
Check the main power supply board for bad capacitors (visible damage ) and make sure that the invertor tubes do not light up for a moment when you power up the monitor ( in that case their probably is one or more light tube defective (burnt)) --
In the Polaroid FLH-3701, the fuse is located on the power supply board, next to the AC power connector. It is a small black cylinder. It is labelled F1. Value is 5 amp, 250 volts.
A fuse does not blow for no reason. Most commonly a fuse will fail because of a short someplace on the board. I have this same TV. The fuse blew. The reason was transistor Q6 had shorted. There are two identical paired transistors on the output side. Q6 and Q7. They are both Infineon 11N60C3 MOSFET transistors. Check those for a short. There may be a burnt smell.
More commonly, this TV will fail because of bad capacitors on the power supply board.
You are not the only one I can tell you that. I had a similar problem with my Phillips 42 in. LCD HD TV.
Here's the problem. The Power Supply Board. I opened my TV
up(warranty was up of course) and found several bad capacitors.
Phillips and several other companies were sold capacitors that although
were highly rated failed within 5 years because of a lack of
preservatives. All sorts of electronic equipment is now being effected
due to these defective capacitors.
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.
I had the same problem before. I open my set to find out the faulty component are at power supply main board.
I change the electrlytic capacitor 680microfarad and a resistor burnt near the FET.
You can visual check first.Color changes and bulky form on cap and burnt resistor easily.
Have a try.