Question about JVC HR-XVC27U DVD Player/VCR

1 Answer

Lightning damage I found a blown fuse, 3 bad transistors and a burned resistor in the power supply section on the main board. I replaced these transistors (with NTE transistors). I couldn't find the exact resistor value I needed (.27 ohms), so I used a .33 ohm resistor. When I plugged the unit in, the display was flashing "Auto", but the clock never did get set. When I started to do the manual clock set, the display died. I found that the fuse was blown and one of the transistors that I had just replaced was defective . Was using the NTE transistors a mistake? Did the wrong value resistor cause this? Or is this unit worth trying to fix?

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  • LEThorne Sep 27, 2008

    This was the answer I was hoping for, but wanted an expert to confirm it. I'll try replacing some parts again with the exact value and see what happens.

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Replace the parts with the original ones, a .5 ohm difference on a resistor on the video circuits will cause the unit not to work correctly.

Posted on Sep 27, 2008

  • Ginko
    Ginko Sep 27, 2008

    Regarding the NTE transistor, if it has same Volt/Amps value, it should work the same. Get a .27 ohm resistor and replace the .33 Ohms.

  • Ginko
    Ginko Sep 27, 2008

    Regarding the unit value, well, if you have to pay $100 or so at a repair shop it is notworth fixing.
    If you can fix electronics and you can get away wasting some of your time and repacing a couple of components, sure it is worth!
    Fixing a power supply circuit is not too difficult. Replace the resistor with original one, ensure that replaced parts have same values as original ones. Test the capacitors ar the end of the power supply circuits.
    If the problem stays confined to the power circuit it should not be too hard to fix.

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1 Answer

Dvd player will not power on


The power supply regulator board to your player has damaged. There is a protection fuse on the power supply regulator board. Check it first. If found blown, replace an other one of same rating. If the this fuse also blow out, as soon as you switch ON the set, make sure that, the poser board is damaged. It is best to replace it as card basis, rather than trying to make it repaired. In most cases, repaired boards found not last long. Contact the nearest LG service center to buy a new power supply card.

Jun 13, 2012 | LG Televison & Video

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I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have tobuy and try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.4_8_2012_6_35_02_pm.jpg

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1 Answer

Sharp dvd player does not come on even on standby although the power supply is on.


Pleasant day!

The problem could be the power supply or the main board.all you have to do is to follow this simple and easy way of troubleshooting.

  1. Remove the cover.
  2. Plug-in your DVD player and power it ON to perform a voltage data/check.
  3. Check the input power of the DVD.Use multimeter tester to test the AC voltage (AC range).It should have 120v or 240vac depends on the requirement of your DVD or the main supply that comes on the outlet.If no voltage reading,your power cord have a continuity problem.Replace it with the same type and A.W.G number standard.
  4. If the power cord got voltage reading.Next is test the output voltage of power supply such as 5vdc for the main board and logic supply using multimeter (DC range).If no voltage reading,the problem could be the power supply board.
Check the following parts which commonly breaks on power supply board.
  • The power transistors (regulators)-It is commonly binds on heat sink and found on the primary of the chopper.use a multimeter (range diode test) to check if it is shorted.
  • The fuse-able resistors-it is the resistor that have low resistance such as 1ohm 2.2 ohms etc.It is usually found near the power regulators/transistors.Use multimeter (range resistance) to check if it is open or change value.
  • The capacitors-it is the one who can store voltage.If you have capacitance meter you can test that,if none just look at the appearance of the capacitor if it is bulge on top or leak.
NOTE: If you found the defective parts that mention above,replace it with the same type and ratings.
When the problem is still there,The problem of the power supply is major and not for D.I.Y.I suggest to send it to the qualified technician or just buy a new one.

5. If the power supply have output voltage.The problem could be the main board and unfortunately the main board is not for D.I.Y because composition of the board is very sensitive.The only way to fix it is to buy a new main board unit.

I hope this solution could fix your problem.Please response if you have any comment and question.Thank you and good luck.

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1 Answer

Won't Power up fuse is not blown


hello,
Since the fuse doesn't blow now (you did replace it with one of the same ratings, right?), you need to check for:

Other blown fuses - occasionally there are more than one in a DVD.

Replace with one of exactly the same ratings.

Open fusable resistors. These sometimes blow at the same time or in place of the fuses. They are usually low values like 2 ohms and are in big rectangular ceramic power resistor cases or smaller blue or gray colored cylindrical power resistors. They are supposed to protect expensive parts like the HOT but often blow at the same time.

If any of these are bad, they will need to be replaced with flameproof resistors of the same ratings (though you can substitute an ordinary resistor for testing purposes). Before applying power, check: Rectifier diodes, horizontal output transistor, regulator pass or chopper transistor (if present), and main filter capacitor for shorts.

An initial test with an ohmmeter can be done while in-circuit. The resistance across each diode and the collector to emitter of the transistors should be relatively high - a few hundred ohms at lest - in at least one direction (in-circuit). If there is a question, unsolder one side of each diode and check - should be in the Megaohms or higher in one direction. Removed from the circuit, the collector-emitter resistance should be very high in one direction at least. Depending on the type, the base-emitter resistance may be high in one direction or around 50 ohms. If any reading on a semiconductor device is under 10 ohms - then the device most likely bad. The filter capacitor should eventually measure high in one direction (it will take a while to charge from your ohmmeter). It could still be failing at full voltage, however.

If you find one bad part, still check everything else as more than one part may fail and just replacing one may cause it to fail again.

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1 Answer

We've had ours for 3 years and when it no longer turned on we found the inside fuse blown. We put a new fuse in of the same rating, it goes right out too. What usually goes in the power supply to have the...


Hi, Sounds very much like the capacitors in the power supply have failed and stressed the switching regulator/mosfet/transistor and caused it to go short.Unless you are conversant with switching power supplies, be prepared to spend some money.

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Your DVD combo use a Switch Mode Power supply.
If you want to give it a bash here is a good guide that explains how they work and how to trouble shoot. http://www.repairfaq.org/sam/smpsfaq.htm
but ...
in 95% of the cases it is a shorted switchmode power transistor and other semiconductors, open fusable resistors, other bad parts. Note: actual cause of failure may be power surge/brownout/lightning strikes, random failure, or primary side electrolytic capacitor(s) with greatly reduced capacity or entirely open - test them before powering up the repaired unit.

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3 Answers

AKAI DVD PLAYER FIXING


Hello NOUSHADK,
I have good news and bad news for you. I'll give you the good news first. You know that new DVD player you have been wanting but never could buy because you already had a DVD player? 
Well, let's just say that you don't have that problem any more. When you dropped that screw on that resistor, you not only caused the fuse to blow, but you took out a few other components with it. This type of power supply is called a switching power supply because it takes AC voltage and then converts that AC voltage to DC voltage to power part of the circuits in the DVD player, then it takes some of the DC voltage produced and uses it to power an oscillator which provides a switching action for a Power MOSFET which is used to drive a switching transformer and then that voltage is converted into DC voltage for the other circuits not powered by the first power supply. Now this creates a problem, because when these types of power supplies blow out they take a lot of components (active and passive) with the blown out component.
Now for the bad news. These types of supplies are very seldom repairable, not because you can't find the parts and not because you cant find the layout, but usually because the parts are hard to find, in the case of the MOSFETs, the Switching Oscillator, and other active components.  Also, the schematics for these devices are not to be found anywhere even by locating the manufacture. This is because most of these units are put together in Taiwan or in Bangkok and then branded by a company, meaning the company whose name is on the unit is not the company who manufactured the unit. So schematics and service diagrams are usually not to be found.
I know this may not help you, but you can try to find the Power supply manufacture by using google, and getting them to send you a new board, or you can try to repair the board yourself, but remember you will have to hunt down at least 3 bad active components and a number of bad passive components.
Thank you,
Shuttle83 

Apr 22, 2008 | Televison & Video

1 Answer

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its hard to help without the schematics have you tried a VR resistor where you can decrease the resistance gradually to try to achieve the required voltage? Thats what I try when I cant get schematics.

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1 Answer

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If the AC power source (outlet) is ok and the line cord and fuse are ok but the unit is completely dead, you may have a problem with the internal switching power supply.

Locate the switching power supply and see if there is a fuse on its circuit board.

Completely dead units are typically caused by a failure in the power supply section.

Please let me know if I can be of further assistance to you.

Good luck!

- Jim

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