Question about Toshiba TW40H80 40" Rear Projection Television

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No picture or sound

I am told i have no high voltage out put the tv is always on standby maby i need new convergence ic's or power suply how do i test these things

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  • dnny_dg Oct 22, 2008

    how do i locate and test these components

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  • Toshiba Master
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You would need the service manual to even begin to troubleshoot a no start situation in a toshiba TV.

Posted on Oct 22, 2008

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Tv screen black, makes a chirping noise


This tv problem are also part the tv Convergence board problems too.The tv convergence board are toally dead have no power voltages activity to the tv convergence board at all.That why u only have chirping sound only.If ur tv convergence board that have some power voltages activity left and have dying parts on the tv Convergence board only.Tv will have picture but have problems R,G,B colors lines mis alignments,have colors shadows pictures or 3D pictures only.The tv convergence board must be repair like replaced 2 STK convergence ICS and some or all it resitors too.Will fix the tv convergence board will fixed the DLP tvs with chirping noises too.The tvs shops will cost u like $300-$350 for parts and labors to fixed the tv convergence board.

Aug 23, 2011 | Philips Magnavox 50ML8105D 50" HDTV DLP TV

1 Answer

Screen does not switch on at all , and no sound either. However standby light is on only when plugged. TV repair told me it is transformer and line up, however asking for more then 100...


Hello, most common faults, such as CRT TV will not turn on. The reason stems from the low power supply failure, or from the high power supply. There are two transformers suppliers, with more common high-tension transformer goes bad. Price of 80 or $ 100, sounds reasonable replacement of transformer. Along with this need to perform some tests that require a professional, to confirm that the problem is due because of transformer. One test is to test basic stability, voltage power reaching the high-voltage transformer. If lower than normal voltage. Then perform the same test, when you break the initial snap of the transformer. If the voltage rises to the desired level must be to replace the high voltage transformer. Good luck!

May 12, 2011 | Sanyo Televison & Video

1 Answer

TV is blurry and the red and green look as if the picture is in 3d and I need glasses. Can I fix this myself?


There is almost nothing that can be fixed by yourself if your not trained in high voltages and advanced circuitry now days. This sounds like it could be your color guns going bad or the power supply.
This set also has an issue with The tv convergence board,require 2 STK convergence ICS and some or all it resistors to replaced to solved the tv convergence picture problems.

Jan 12, 2011 | RCA HD56W58 56" HDTV

1 Answer

You turn on the tv then it turns off right away with no picture displayed could probably used new screen too


The repair of this unit will be determined by the status of the high voltage on initial power up. You need to do a few tests in order to narrow down what the high voltage is doing. You will need someone to assist you.

Unplug the AC cord. Remove the rear lower cover from the tv. Make sure the room is quiet. Put your ear inside the tv being careful not to touch anything metal, although most metal objects are ground. Next, have someone insert the cord into the AC outlet while listening very carefully. What you are supposed to hear is a click which is a relay and high voltage snap up. If you do not hear a swishing sound, which is the sound of high voltage have someone press the power button on the front while you are still listening. If you hear the swishing high voltage sound come on, it will come on and stay on, or collapse. Repeat the test, unplug the cord and plug in the cord to confirm the high voltage is coming on and staying on or coming on and going into collapse.

If the high voltage does not come up at all it means that there is a basic high voltage power supply problem and an experienced technician needs to guide you through a high level repair which is above the scope of this discussion. You may want to contact a skilled technician.

If the high voltage comes up and collapses right away, which is the most common fault, it means that the unit is entering the protection mode. The protection mode is most commonly caused by convergence or vertical sweep system on that model and big screens in general. These repairs can possibly be done by consumers with basic electronics knowledge. If you want to repond with test results we can supply more information on repairing the convergence or the vertical sweep system.

If the high voltage stays up then the likely fault is a power supply problem is muting both the video and the audio causing the unit to go into protect. Consult a service manual, track power flow though out the unit to determine which circuit is impaired.

Apr 27, 2009 | Samsung HC-P4752W 47" Rear Projection...

1 Answer

I have a philips 9p6044. where can I buy convergence ic's and a


its far more likely that you need a new Vertical output IC. The convergence ICs wouldnt prevent the picture. When you have audio but no video it is often meaning vertical failure. Try replaceing the vertical IC

Apr 23, 2009 | Televison & Video

1 Answer

Tv Problem


Sony TVs generate an error code. The front panel LED (red) will flash anywhere from one to eight times which can isolate the problem circuit. It is not always accurate.

If you have a test meter which can read DC voltages and resistance in ohms, you can locate the problem area. If you lack the expertice to do so, contact a sony authorized servicer. If you have the ability, start by checking fuses on the "G" board ( power supply board) and the "D" board or deflection board.

A major problem area in this TV is the convergence circuit. There are six fuses around the convergence output ICs on the "D" board.

If any are open, replaces the output ICs.

Feb 13, 2009 | Sony KP-61HS10 61" Rear Projection...

2 Answers

Tv tcl-14175 no sound on channels but ok on audio video mode


Hi

The first problem was always standby mode.... get back the original eprom IC 24CO8WP in to the PCB, then find the original remote control of you TCL Tv tcl-14175 then you power On In the Remote control while your TV is in Standby mode! then you see your tv is going ON... Because your unit is in Child lock Mode....

thanks!

Nov 21, 2008 | Samsung DLP HL-P5663W 56" TV

1 Answer

No Picture / TV screen RED


There seems to be a dry solder joint on the video amplifier IC. The red picture is cause by a defective video amplifier IC(IC701) that is located on the red CRT assembly.
This repair might not be a DIY due to the danger of working around devices that produce high voltages in excess of 32KV.
Let me know if you need further assistance.

Jul 15, 2008 | Sony KP-51WS510 51" Rear Projection...

3 Answers

Will not power on


this could be a number of probs. needs to be ck'd by a tv tech can usually be repaired for a few hundred bucks suggestions..audio ic,convergence ic,signal board or power module..note these parts are pricey so trouble shoot to correct part. John

Sep 05, 2007 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

Rear projection 43" Tv


The black box with 4 large red wires in it is the high voltage distribution box. One red wire brings the high voltage in and the other 3 bring high voltage to each of the 3 picture tubes. If those red wires are not all the way in and tight, then there will be high voltage arcing inside that box and the picture will rapidly flicker. Make sure all red wires are pushed all the way into those holes and your picture should be back to normal. Convergence IC's will not make the picture flicker, so I am sure your IC's are fine.

Mar 18, 2007 | Toshiba 43H70 43" Rear Projection...

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