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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  • JVC Master
  • 19,396 Answers

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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Projection TV troubleshooting techniques.


When you turn your television on and get nothing almost anything could be wrong with it. The two most likely places to look are the high voltage section and the low voltage power supply. In order I will explain what to check to try to resolve the problem.

First, is the standby light blinking in some sort of pattern? If so, count the number of times it blinks between long pauses. If it is blinking in a patten, this is an error code, and can be helpful in diagnosing the problem. Depending on the manufacturer the blinking pattern will mean different things. Error code lists are available by googling "(manufacturer) tv error codes". Proceed from here based on the information provided by the error code list.

First for safety unplug the unit. If your set has no blinking lights proceed by checking the main fuse in the power supply for continuity and replace if open. Then proceed to looking at the mainboard for burned resistors or bulging electrolytic capacitors. Electrolytics look like little cans, with shiny ends and are generally black, grey or blue. They have a positive and negative lead so be careful when replacing to get the polarity correct. If they are bulging replace them. Also replace any bad resistors found. At this point it would be a good idea to inspect all solder joints on all boards, but especially the Low Voltage and High Voltage sections, and resolder anything which looks suspicious.

Finding no charred resistors or bulging caps, and after resoldering all connections, your unit still does not work, check the horizontal output transistor for failure. Using a DMM on diode check, check the transistor out of circuit for shorts/opens between any two leads. A good unit should have somewhere between 500 and 1000 ohms one way and infinity when the leads are reversed. Only two lead configurations will show conductivity. One set of leads should show infinite resistance both ways. If the transistor checks bad, replace it and the flyback. Check all resistors and diodes in the HV circuit and replace any suspicious units.

If the horizontal output transistor checks OK, check all semis in the LV power supply. Replace any bad units found and check all associated resistors and replace as necessary.

If both the HV and LV sections check OK, remove the circuit board from the CRT and try the unit. If it runs your CRT is bad and needs replaced. If it does not run your problem is elsewhere.

Working one section at a time, remove and isolate any remaining sections while attempting to turn unit on. If unit works with a particular section disconnected, your problem is in that section and you will need to do normal troubleshooting procedure, listed above, on the section in question.

If after all the above procedures are tried, and your unit still isn't working, you may have to replace an entire board. These days most boards are relatively inexpensive. The most likely board would be the LV power supply which usually contains the HV power supply also.

Any parts or boards needed can be ordered at http://www.encompass.com or http://www.shopjimmy.com .

Good luck with your troubleshooting and be careful while inside the set especially near the High Voltage second anode where it connects to the CRT.

Thanks for using FixYa and the great rating.

hardrocko

on Oct 13, 2010 | Televison & Video

1 Answer

TV hit by lightning strike. Replaced blown fuse, still won't turn on.


Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis.

Aug 05, 2014 | Televison & Video

1 Answer

TV won't turn on. Is there a fuse that needs replacing?


Good day!

When the TV is not turning ON it doesn't mean that there's a busted fuse inside although it have a possibility.There are a lot of causes to be considered.Like shorted transistors,leak capacitors open resistors and shorted diode.

Follow this D.I.Y procedures to find the exact problem of your TV.
  1. Remove the back cover of your TV.
  2. After that,find the power supply board.
  3. If you already found the power supply,plug-in your TV and power it ON.Check the input voltage of it,using multimeter (AC range).If the power supply have no input voltage the problem could be the power cord.Replace it.
  4. If the power supply have the input voltage,try to test the output voltage if have 5vdc for the system and logic supply,12vdc for the sounds and 24vdc for the back-light inverter.Use your multimeter tester (DC range) to test that.
  5. If the power supply have a voltage outputs such as 5vdc,12vdc and 24vdc and the problem is still there.The problem could be the main board.Replace it with the same type and model # because the main board is no very difficult to fix and its very sensitive.
  6. If the power supply have no output voltage or the voltage is too low,just ignore the step # 5 because the problem is not on the main board,its on the power supply board.
Check the following to fix the power supply board:
  • Fuse: Check the fuse if it is busted or blown.
  • Power transistor (regulator): Check the regulator if it is shorted or leak.
  • Resistor: Check the resistors specially the one that have a low resistance that near the power regulator.
  • Capacitor: Also check the capacitors if it is leak or bulging top.
NOTE: If you found any defective parts or components that mention above replace it with the same value,type and ratings.


Thank you and good luck.Please don't forget to vote and rate my answer.

May 08, 2011 | Televison & Video

1 Answer

I have a panasonic th-42px80u, i turned it on and there was a pop and a flash from the back of the tv. It will not power up and have no red light. ive taken apart and inspected power supply board for burn...


Look for a fried (possibly exploded) transistor or diode on the power supply board. In particular, look at the transistor mounted on a heat sink (metal radiator block) between the fuse and the largest transformer on the board. It may also have a damaged regulator chip driving it. Modern TV sets operated by remote controls generally have the power supply split into two sections - standby and main. Your problem is most likely in the main section.

A voltage sniffer won't tell you much - most sets have power right up to the fuse on the power supply board. If the fuse is blown, don't bother replacing it until you find out what blew it - you'll just waste another fuse. I generally start by doing ohmmeter checks (power disconnected!) on the diodes and transistors - anything reading less than 1 Ohm is probably fried or is being shorted through a transformer winding by another fried component. Other readings must be interpreted according to the circuit design.

Nov 27, 2010 | Panasonic Viera TH-42PX80U Plasma TV

1 Answer

Hi; my friends blew the power supply board on this desk; will I be able to change individual components or have to fork out 160 euros for a new board? I think I could cope with changing components if...


It is likely one of the amps have blown as well as the power supply. The pwoer supply wipes out about $30 of components when it goes. If the fuse had been replaced after initial failure this results in more damage. For the power supply, typically the two IGBT's are wiped out and the four transistors driving them as well as the regulator chip and one or more of the gate speedup diodes which are surface mounted. Sometimes the surge limit resistors which are ceramic pacakged are blown. The hardest part is removing the heatsinks with the IGBT's on them. You DO need a desoldering station to work on this.
Usually you will find damage to the rearmost amp in the amplifier module. An arc beween layers of the multilayer circuit board causes inital failure. Three MOSFET transistors are blown and a Zener plus the board is charred and this cancer has to be ground away and re-insulated and circuit traces replaced by jumpers. Sometime the .03 ohm metering resistor on the bottom is fried... when that happens, two small surface mounted transistors are blown as well. All in all $50 of components are damaged typically.

Oct 31, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

No Power at all. Fuse blown-Burn smell from fan area.


You did a lot of damage, and replacing the fuse and trying it has caused much more.

There will be about seven blown parts on the amp and a dozen on the power supply. To give you an idea of the extent, the WHOLESALE parts cost is roughly $50, including the main power supply switchers IGBT's which cost nearly $20 for the pair by themselves.

I have repaired several of these and the larger cousin the PMP5000. It is a lot of skilled work to repair these.

The cause is a marginal insulation between layers of the multi-layer amplifier board. Usually the rearmost amp arcs between the layers. This fries three big switching transistors followed sometimes by a metering resistor and two small surface mounted transistors. A zener diode often goes. The cancer and burned area has to be ground out with a dental drill and new wire replaces the blown circuit traces.

If you are under warranty, take the unit for replacement.

The thing that can arc the amp is if speaker leads are marginal or get pulled out while under power. Excessive volume, especially pulses at high level can break down the insulaton causing the arc and failure. The black smoke is likely from the metering resistor.

Jul 30, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

2 Answers

Dead Set after power surge


Check the power supply transformer primary driver transistor and the associated components (some diodes and capacitors, resistors, an optocoupler maybe) and the rectifier diodes (or a bridge) and capacitors at the transformer secondary, what you are looking for is a short circuit, however, the short may as well be in another section of the circuit board (a shorted component may sometimes have signs of damage caused by heat, but this is not a rule).

Hope you can find out what it is...

regards

Triarcuate

Oct 01, 2009 | Televison & Video

1 Answer

Blown fuse and replaced it and burned the amp


BIG problem! You should NOT have replaced the fuse as additional damage has been done. I repaired a PMP5000 and I can tell you likely what you will find: The smoke and smell came from two power resistors that are part of the soft start circuit that now are toast. You will likely find several components in the main portion of the power supply that are toast. These will include transistors, resistors, diodes, and probably the small 8 pin switching regulator chip. There is a small power supply that comes on first which enables a relay that shorts out those soft start resistors AFTER the power amplifier BALANCES and normalizes.
The unit I repaired had severe damage due to arc-over at one power amp section. Three power transistors were destroyed there and board traces and charring had to be handled in that section.
The repaired unit had to be brought up with a light bulb in series with the line power cord to prevent further damage until all bad parts were discovered and repaired. You will need to take the unit to a shop that is expperienced with the product. The repair cost MAY be pretty high.

Mar 08, 2009 | Behringer Pmp3000 16 Channel Audio Mixer

2 Answers

Kenwood basic M2 Amp Lightning strike


you can check the output transistors for short circuits with the low ohms range or diode checker . If they have failed, then it is often a good idea to replace all as much stress can be placed on an output array in this type of failure. to repair reliable, all outputs on an offending channel should be replaced.

Make sure the fuse you replaced was the same type of fuse. check markings.... T stands for sloblo... a fast blo duse may let go at turn on. The power supply may have a shorted rectifier diode in it also.

be aware however, every time a fuse of that rating blows... more damage may be occurring to the amp.

Dec 11, 2007 | Kenwood VR-407 Receiver

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