Question about Audiovox VE-920 9 in. TV/DVD Combo

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AudiovoxVE926 no picture

2 transistor and 1 condenser burned on smallest pcb inside flat panel,
part n. for transistor DF S2N. can I find this parts or equivalent,?.

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  • Robert Rattew Feb 28, 2008

    No back light on lcd screen

    .1 mf 63v capacitor & 2 transistors part # DF S2N are shorted on small board # CL-70MA Looking to find where to purchase either the board or bad parts

  • vikshah Jun 22, 2008

    Have the same problem with PCB CL-70MA 060125. Has anyone discovered if a replacement is available. Has anyone found a schematic of the board to rebuild?

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Have the same problem with PCB COMMAX CL-70MA 060125. Has anyone discovered if this board can be purchased? Does anyone have a schematic of the board?

Posted on Jun 22, 2008

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How to test H-out transistor if it is good or defect?


All pins shorted together means the transistor is defective.

Generally, there are about 3 tests I usually do with ohmmeter to test a bipolar transistor:

1. Measure resistance from collector to emitter. If it is zero, transistor is shorted (bad).
2. Measure resistance from base to emitter. Should show conduction in one direction, but not the other.
3. Measure resistance from collector to emitter. Should show conduction in one direction, but not the other.

Nov 15, 2013 | Combination Televisions

1 Answer

Dear sir i have samsung 21 inch flat television now horizontal drive transistor fails after few hours i replaced 3 times the same transistor(tt2222) but again geting fails so pls let me know what is...


Hello
You just replace the freewheeling capacitor, normally come up to a value of 5600pf 2000V or so, connected to the collector of the horizontal output transistor, fitted very close to the collector lead. Replace the yoke return capacitor, 0.33uf or so also. Usually samsung sets use no heatsink for the horizontal output transistor. You just put a small heatsink to it and check. If it doesn't overheat, you can remove it later.
You can suspect the deflection yoke also for shorted winding. To check this. pull out the CRT base board out of the neck of the picture tube, place it where it doesn't get short circuited, and unplug the deflection yoke connection from the main board, and switch on the set. See whether the transistor overheats now. If it doesn't overheat, suspect the deflection yoke for shorted turns of winding inside it. Till the transistor overheats, suspect the LOT.
NOTE: Never switch on the set while unpluging the deflection yoke connection plug from the circuit board, without dismandling the CRT base board. CRT may get damaged, with a black burned spot inside the center of the screen.
OK.

Dec 15, 2010 | Samsung CXJ1952 19 in. Combo

1 Answer

Screen Doesn't Appear, power comes on but NO Picture,pls help


There are several possibilities that come to my mind about this problem.

Firstly, most problems come down to power, or rather a lack of - because of a component breakdown.

1]...It may sound obvious, but there could be a problem with the unit's internal power supply module that regulates the supply to the HT (High Tension) side of the circuit; It could be
a]...a transistor;
b]...diode;
c]...safety resistor;
d]...Or, but unlikely, a fuse.

this is the part of the main board that contains the line output transistors, line output transformer (LOPT) etc, & supplies the extremely high voltage (typically thousands of volts) to the crt (Cathode Ray Tube).

2]...It could be the line output transistor, or another component - such as a safety resistor - in the line out stage.
The line output transistor would be located on the heatsink, very close to the LOPT.

3]...It could also be the line output transformer;
a]...My first check for this would be for dry solder joints on the LOPT, on the underside of the main board.

I must stress, as a retired tv engineer myself, there are very dangerous voltages inside television sets, & I talk from experience - I've had some nasty shocks in my time, & it only takes a few milliamps of current to kill you, if it goes through your chest (Up one arm & down the other).

Even after a tv has been unplugged from the power socket, on the wall, it can contain dangerously high & possibly fatal voltages.

So please, DO NOT attempt this repair yourself, unless you are qualified to do so; either ask someone who you know, who is qualified, or take it to the tv repair shop.

I hope this has been of help to you.

Thanks,
Steve.

Oct 01, 2010 | Combination Televisions

1 Answer

Grundig gu19wdvdt wont turn on but the blue led standby light is on is there anyway of resetting or fixing?


You might wish to unplug the TV for an hour or more. If this power reset does not allow the TV to turn on component failure is indicated. These sets are assembled using the wave soldering process they are known for having cold solder connections. The safety circuitry shuts the TV set down when it detects a problem. This model of TV has over 2,000 parts which include millions of transistors inside the integrated circuits. The capacitors will change value, leak and become defective. Resistors will change value and burn. Integrated circuits and transistors can go bad. This can cause other components to become defective, which can have a domino effect and cause other parts to fail. Replacing one defective part may make the TV operate for a short time but the part will fail again since if the parts that caused the failure to begin with are not replaced. I expect the power supply is causing the problem, since this us a part that is known to fail on this TV. The only way to know for sure what is causing the problem, which parts that are no longer within factory specs and for proper repair all the electronics must be diagnosed by someone with the correct electronic test equipment and the skills to use the test equipment. I wish I could tell you there was a quick fix or button to push that would fix the TV but that is not the case or the solution needed to get the TV operating correctly. If you decide this is not something that you can do I expect the repair will run about $200 US for the needed repair.?

Jan 20, 2010 | Combination Televisions

1 Answer

I have sound, but no picture. A bright horizontal line appears across the TV screen, again, no picture ?


Hi


Thanks for using FixYa. Heat is the number one enemy of electronics, and these sets operate hot. This problem is caused by the power supply being overloaded. This is often caused by failed convergence ICs. The safety circuitry shuts the TV set down when it detects a problem. Some parts for this TV will be hard to impossible to find. This model of TV has over 3,000 parts which include millions of transistors inside the integrated circuits. Over time the capacitors will change value, leak and become defective. Resistors will change value and burn. This will cause other components to become defective. This can has a domino effect and cause other parts to fail. Replacing one defective part may make the TV operate for a short time but the part will fail again since if the parts that caused the failure to begin with are not replaced. The typical cost to get this fixed by a pro is about $300 - and it doesn't mean that he/they will do a job better than you do. The parts are less than $100 (about $20-$30 for the IC's) if you want to do it yourself. Replacing only the IC's MAY solve the problem; however, many people have also had blown resistors requiring replacement. Why would you ask should you replace both of the IC's if only one is shot?! If one is shot the other one is not far away and for that little price of the chips it worth changing them both at the same time. Also the convergence board should be checked for cracked solder. If you replace the ICs and the resistors are shot, the ICs may blow again almost immediately, meaning you may have to do the repair twice.


Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks

Rylee

Dec 29, 2009 | Panasonic Combination Televisions

1 Answer

My 50RV52U model Toshiba TV shuts off after viewing for about 1 hour and just says no video signal


The safety circuitry shuts the TV set down or will keep it from turning on when it detects a problem. This model of TV has over 2,000 parts, which includes millions of transistors inside the integrated circuits. The capacitors will change value, leak and become defective. From the information you have provided I expect at least a few capacitors are going bad and causing the problem. There could be other parts that are no longer within the needed specifications. Resistors will change value and burn. Diodes and IC can go bad. This may have a domino effect and cause other parts to fail. Replacing one defective part may make the TV operate for a short time but the part will fail again if the parts that caused the failure to begin with are not replaced. The only way to know for sure which parts that are no longer within factory specs and for a proper repair all the electronics must be diagnosed by someone with the correct electronic test equipment specifically designed for TV service and the skills to use the test equipment. I wish I could tell you there was a quick fix or button to press

Aug 28, 2009 | Combination Televisions

2 Answers

Screen is going black, can barely see image, sound is good


Heat is the number one enemy of electronics, and these sets operate hot. You might wish to unplug the TV for an hour or more. If this power reset does not allow the TV to turn on component failure is indicated. These sets are assembled using the wave soldering process they are known for having cold solder connections. This model of TV has over 3,000 parts which include millions of transistors inside the integrated circuits. The capacitors will change value, leak and become defective. Resistors will change value and burn. Integrated circuits and transistors can go bad. This can cause other components to become defective, which can have a domino effect and cause other parts to fail. Replacing one defective part may make the TV operate for a short time but the part will fail again since if the parts that caused the failure to begin with are not replaced. The only way to know for sure what is causing the problem, which parts that are no longer within factory specs and for proper repair all the electronics must be diagnosed by someone with the correct electronic test equipment and the skills to use the test equipment. I wish I could tell you there was a quick fix or button to push that would fix the TV but that is not the case or the solution needed to get the TV operating correctly. The TV is definitely repairable. I see no reason to replace the TV.

hope it helps-

Aug 17, 2009 | Toshiba 14DLV75 14 in. TV/DVD Combo

1 Answer

MY SCREEN IS DARK OR BLANK EVERYTHING ELSE WORKS GOOD JUST NO PIC


Hello fixedopsmike,

There is a fuse in the TV set, if you would like to check and see if it has blown, here is a way you can do it:

1) Unplug the TV's power cord from the wall

2) Take the back off of the TV by removing the screws and slowly removing the back panel.

3) Look for a component that looks like a glass tube with metallic caps on each of the ends, this will be the fuse.

4) Visually inspect the fuse to see if it shows signs of being open (Blown) These signs are burn marks inside of the glass tube, an open conductor (wire) inside of the glass tube, or no visible wire inside of the tube.

5) using a multimeter set to resistance (R x 1) test the fuse for continuity (remove and change the fuse if found to be defective)

6) If the fuse is not bad, reinstall the fuse if removed, put the rear cover back on.

Now at this point we have determined if the problem is a fuse being blown or not, if you replace the fuse and the TV works great the problem is solved, if you replace the fuse and it blows again, or if the fuse was ok to begin with, then you have a problem that will require some knowledge of electronics pass the basics to continue on. At this point I would suggest that you call a qualified TV repair technician to troubleshoot and repair the TV in question.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Nov 22, 2008 | Toshiba MW27F51 27 in. TV/VCR/DVD Combo

1 Answer

HOrizontal width problem


With older sets i found dust as the main culprit in simmular situations.check for any  adjustment pot on the circiut controlling the screen width[normaly 3 pots close together open back of set to reveal electronic's]. be very carefull not being electrified as the set must be in operation while doing the adjustment.even turning the pot forward and back and then to the original position sometimes solve the problem.

Oct 17, 2007 | Combination Televisions

1 Answer

Blue missing from picture, ie red and green only visible


You could have a bad connection on the picture tube socket, the Driver transistor could be bad or a poor solder connectionm in the blue driver circuit or the picture tube could be bad. Now there are no user serviceable parts inside this set so you shouldnt be looking or tinkering with it unless you know the HI voltage concerns involved with serviceing tv sets. you should be able to get an estimate on this set at your local repair shop, Good Luck

Jun 16, 2006 | Bush DVD142RC 14 in. TV/DVD Combo

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