Question about Dell W5001C 50 in. Plasma HDTV

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W5001C power is on, but no image....

I knew there is problem on the this IC board LJ41-03078A, I would to what's voltage on the following ic: ZD5022, ZD5021, ZD5018 & ZD5019. Because I can't get a :Service Manual". Could someone help with this issue? Thanks!

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I was able to get the y-board LJ 41-03078 from Coretronic in Taiwan. I ordered it from charlesliu@cds.coretronic.com. The part costs 263.20 and I was able to get it within a week. The only way to pay for it was to wire the money to Taiwan. My baord has been installed and working great.

Posted on Nov 25, 2008

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Im trying to repair a Bx4500h. there is not output, the preamp sections works and the transformer works. I tested both. Im thinking its a problem with the 3080 IC underneath the amp board. Theres 2 cables...


Well, first off, if this is an IC output, depending on the rated watts per channel, you will certainly need a rail volt greater than + - 15V. That would be for a regulated voltage somewhere else in the amp.

Mar 07, 2015 | Audio Players & Recorders

Tip

How to find and replace a defective vertical IC.


When your TV works, has sound, good indicator light but all you have for a picture is a horizontal line across the screen, you have no vertical drive. This can be caused by the IC overheating or a power spike. In addition if you have a newer TV (projector) it may not turn on and will only blink an error code.

This is not a difficult fix but requires patience, good soldering skills and dilligence. Begin by unplugging the set and removing the rear lower area. Around the perimeter of the section you will see screws. Some will have arrows pointing at them. Remove all these screws and remove the rear cover.

Now you should be able to see the entire chassis. It will be mounted on a plastic frame and will consist of two or more circuit boards. The one, usually on the left, will be a small signal board. The one on the right will be the low voltage power supply, high voltage power supply and you guessed it, the vertical drive section.

The vertical IC is located near where the wires from the yoke which are red,green,yellow and blue terminate on the main board. The yoke is a large coil on the rear of the CRT which spreads the beam. It is slid over the glass CRT. Follow the wires (which should be green, yellow, blue and red to the circuit board. This will be the vacinity of the vertical IC. It will be mounted to a large heat sink and generally the designation begins with "LA" followed by 4 numbers. Panasonics generally begin with TDA.

Once located, remove and replace the unit. Removing the unit will probably require removing the circuit board. This involves removing all the screws around the perimeter of the board and any which you find in the center of the board. Do not force it, if it will not move easily look for and remove more screws.

You can get the replacement parts at http://www.encompass.com . Make sure you clean off the old heat sink compond and reinstall new heat sink silicone also available at the same web site. The heat sink compound facilitates heat transfer to the heat sink and keeps the IC cool. Generally the ICs are run at a high output and get very hot.

After replacement of the IC check all the safety resisters near it for continuity and also any and all diodes for integrity. These parts would be in the vicinity of the heat sink. Removing the IC may require prying it off the heat sink as many times the heat sink compound acts like a glue.

If everything checks ok you should have a working set.

If you do not have vertical drive, you will need a schematic to find the power source for the IC and test the circuit to see if it has the proper voltages.

You can sometimes get schematics from http://www.encompass.com but they do not have all of them. If you do not mind paying about $16.00 US you can get any service manual from http://www.servicemanuals.net .

Once the proper power is supplied to the IC you should have a working set.

Remember to use an isolation transformer anytime you are going to check voltages in the set. Modern TVs have the chassis attached to neutral making a 60 volt difference between the chassis and hot side. This means that if you do not use an isolation transformer and apply a DVM with a low path of resistance you will cause a direct short and blow the fuse, if you are lucky. Also remember to be careful when measuring voltages as there are lethal voltages in a TV when plugged in and running.

Thanks for using FixYa and for the great rating.

hardrocko

on May 11, 2010 | Televison & Video

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I have sony J21mn11. problem not power on only red lit led only.i check all the components on the power supply area and horiz. output D1878 all are good. there is power IC STR S6707 on power supply area. i...


If you have a digital tester or analog try to check the voltage reading from the power supply if high or low or no supply.Check first following voltage location and section. * Check the AC voltage from ac cord to fuse and before the bridge type diode. * Check the DC voltage after the bridge type diode.if normal voltage. * Then check the voltage into the filter capacitor to regulator ic.the power ic.If theres a input voltage in the power ic,check the output voltage going to harizontal output.If no output the problem is you power output.You need to replace it.

Jul 12, 2011 | Sony Televison & Video

1 Answer

NEC Multisync LCD1770V Model# L174F- Monitor powers on for a few seconds then goes black. You can still see a faint image in the background and the power light is still green. I checked for leaky caps on...


Check the iCs on the lcd control board which shut down the ccfl lamps? If hot put a paper sticker slightly smaller on the IC. This prevents condensation from osmosis into the IC.

Dec 19, 2010 | Televison & Video

1 Answer

My sony KV-G21PD1 sounds are not working


Hello
Either your TVs internal speaker or its sound output Ic has damaged. You can make sure about which part is damaged through the following sugession.
Just place your ear, very close to the TVs speaker side, and switch on your TV with its front panel power switch, not by the remote control. If you can hear a 'thumb' sound or 'HUM' sound, you can make sure that the speaker is ok. If you hear a 'HUM' sound as describe above, make sure that its sound output Ic has damaged. If the sound output Ic has damaged, sometimes you may not hear any sound at all too.
Connect the TVs audio out RCA scoet to an amplifier, if you have, and try to get the sound through it. If there is sound through an external device, make sure once again that the internal sound output Ic has damaged. Speaker can be checked by a torch cell, connecting its terminals to the two leads of the speaker, with two pieces of wire, just intermittent touch, you can make sure that it is ok or not.
To replace the sound output Ic, you must open your TV, and locate the sound output section inside it. It is easy, to do, just follow the speaker wire, and find it from which point from the main board it orginates. Somewhere near to it, you can loact this Ic.
Before replacing the Ic, just measure whethere there is voltage comes to its supply terminal or not. If there is voltage, and no sound at all, replace the Ic with same type and number without any doubt.
If there is no voltage comes to the input pin of that Ic, check the track leading voltage to that point, and find whether there is any resistor has opend or not. Ok
If you need any further assistance, contact me through Fixya.
OK.

Nov 26, 2010 | Sony KV-27S15 27" TV

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I have an rca ctc186/7 series tv and it has no sound. We tried cleaning it, hooking other speakers to it and hooking up a dvd player and still no sound.


Hello

The audio output Ic inside your tv has damaged, or it doesn't get proper voltage. You just open your TV, and locate the audio output Ic. It can be located by following the speaker wires. Usually it will be screwed onto a heatsink. Check the input voltage with the help of a multi meter, af it is there, the Ic is damaged. Replacing it will solve the problem. If there is no voltage, follow the supply track and find out the opened circuit point. Usually a small value resistor, say 0.01Ohms in value, will be connected in series with the power supply to Ic. If it gets opened, there will be no supply to Ic, resulting no sound. If the audio outpu Ic get short this resistor will open. So keep in mind that, if this resistor is opened, there may be a short inside the output Ic, or come capacitors fitted with this supply line, after the reistor. Check the also for any short. keep a keen look at the solderings fo the leges of this output Ic. Some loose, or bad solderings also may be there. Anyway, your TVs audio output section is faulty. Find the reason and rectify it. If audio Ic is found defective, desolder it out from the board, and replace it with a same type and number. Ok

Gopakumar. India.

Nov 21, 2010 | RCA Televison & Video

2 Answers

My screen close down from top to bottom and lives a horizontal line rite @ the center of the screen,,,,, Which component is mostly faulty in here ? and what kind a component is this ..?


Hello
It may be due to an Integrated Circuit [IC] fault. Your TV has lost its vertical sweep, and the is why you see a norizontal bright line across the center of the screen. All TVs has bot Hotizontal and Vertical Sweep to spread picture on the screen. When Vertical sweep fails, you will see a horizontal line, and when horizontal sweep fails you will see a vertical line at the middle of the screen.
n your TV, most likley the vertical Ic is faulty. This is a common phenomena in almopst all telivisions. The said IC is diretly soldered into the circuit board inside your TV. To replace it you have to open your TV. Take all precautions before opening the back cover of your TV. You are going to work with an electrical equipment, and keep it in mind always. After opening the back cover, just locate where the Vertical Output Ic is. It will be normally screwed to a heatsink plate, inorder to radiate heat from it while working. You can locate it by the following method. Different TV circuits has different positions to this Ic. Just look on the Deflection Yoke [the coil fitted on the neck of picture tube]. From there four wires will go to the main printed circuit board. Out of which two of them will be thick, and other two will be thin. The two thin wires are the carriers of vertical sweep from main board to deflection yoke. Follow the the two thin wires. You will see it to be pluged into one point at the printed circuit board. Just upside down the printed circuit board, after pulling it outwards, not disturbing any of the wirings, and look through the circuit track, to which point the tracks goes to. Somewhere near to it you can locate the above said IC.
Just take the main input votage to that IC. It will be normally 18v to 35VDC. You must have multimeter to measure this voltage. If the voltage is there, look for any loose solderings over there to the legs of that IC. If there is any soldering loose, the IC will not work properly, and vertical sweep loss will be the result. If there is proper voltage check the voltage at the output pin of that Ic. It should be almost half the voltage of the supply voltage. If it is not there, make sure that the IC has damaged.
Resolder it out from the board, and go for a same type and number. Replacing it will solve the problem. Normally vertical output ICs are not very cosltly. Here in India, all types of vertical Ics will have a price rate between 80 to150 Indian rupees, that is upto four American Dollars. Ok.

Nov 06, 2010 | Sony KV-35S65 35" TV

1 Answer

Mixer not working and board getting hot


There is likely a voltage regulator or a diode burned out in the vicinity of the power supply. If you have the schematic, start at the power supply and work through the circuit to the I.C. Also look up the pinout on the internet for that I.C. With the power on test the voltages at each pin on the I.C. You should not have supply voltage readings on any of the signal pins. This is an indication that the I.C. is also burned out. Use a volt ohm meter with a D.C. voltage setting. Also hopefully your meter should have a diode test function. If not you can still test them with the resistance test function.Here is a link to an explanation:http://www.elexp.com/t_test.htm I hope this helps.

Mar 03, 2010 | Vestax Pmc 280 DJ Mixer

1 Answer

Shrinking horizontal screen image appears with black border approx 1/2" on both sides


The most likely cause is a dried up main filter capacitor. Once the effective capacitance drops low enough, 120 Hz (or 100 Hz in countries with 50 Hz power) ripple will make its way into the regulated DC supply (assuming full wave rectification).

Another likely cause of similar symptoms is a defective low voltage regulator allowing excessive ripple. The regulator IC could be bad or filter capacitor following the IC could be dried up.

The best approach to testing the capacitors is to clip a good capacitor of approximately the same uF rating and at least the same voltage rating across the suspect capacitor (with the power off). A capacitor meter can also be used but the capacitor may need to be removed from the circuit.

Once the capacitors have been confirmed to be good, voltage measurements on the regulator should be able to narrow down the problem to a bad IC or other component.

Feb 21, 2010 | Dell E551 15" CRT Monitor

1 Answer

Viewsonic VG919S 19" LCD


Hi

You must focus to mainboard of LCD monitor find the voltage regulator IC. Voltage test the regulator IC use digital or analog multimeter range 10v dc connect the negative to cold ground, these regulator providing a constant supply of 2.5 - 5v to all IC in the mainboard. check the scalar IC. Because scalar IC will convert analog input signal of Red, Green & Blue. Lastly check the controller board, check the ribbon cable connector from mainboard to
controller board for lose, check the fuse inside controller. I think the exact problem of your monitor could be either the (mainboard) or (LCD panel where the controller board is located).

Oct 06, 2007 | ViewSonic VG910S (Black, Silver) 19" LCD...

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