Question about Toshiba 43HX70 43" Rear Projection Television

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No boot up

Red light on the front is on, but no boot up
changed cxp75010 and an... ic,s and a few transistors
power supply is working correctly
still same problem , any ideas?
no sound no image

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  • 167 Answers

Hello it sound's like your fly back transformer is bad check the horzantal output transister.and it.!!! change them and your set will work. most likly.!!! "GOOD LUCK"

Posted on Nov 05, 2008

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1 Answer

I have a Hitachi Ultravision 55 the TV turns on for a few seconds then the screen goes blank, the temp light flashes what do I do, I just had the bulb replaced as well.


probably the bulb taht was placed in is faulty also.or some component in the power supply is getting heated to too much voltage.and cause it to get faulty.can be a transistor or IC..in the power supply.have a tech look at your tv.good luck.

Sep 23, 2011 | Televison & Video

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Red power button blinking but tv won't power on


chec your ic register diode and transistor.
aslo check poer supply waltage and earthing properly.

Oct 11, 2008 | Toshiba TZ50V61 50" Rear Projection...

1 Answer

My tv has no sound or picture turns on then temp and lamp light blink red then set turns off


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 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. 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 push that would fix the TV but that is not the case or the solution needed to get the TV operating correctly.


It's the problem of overheating in the power supply board of the TV.on the power supply board of the TV there are few capacitors and IC.any of this IC is got short or may be weak.so due to this when you start the TV the current passes from electric outlet to the power supply board of TV.but when the current passes from that weak/faulty part at that time current gets stopped or slow and the board overheats and TV shuts off.

his is a common problem faced by many other users too.the possible option to solve this issue is to check the power supply board by a meter and continuity tester and replace the faulty component on the board which is short due to which power supply board is getting overheated.its bit technical job but yes its not at all a costly repair to do or get it done by the technician. for required parts it can be easily available from local electronic hardware shop.

Hope this will help in solving the problem.......

Jul 17, 2011 | Hitachi 50VF820 Projection TV

1 Answer

Blue and red light are blinking changed bulb didnt help


Hi bigtaz45,

This is an indication of out-of-regulation in the power supply section. The very common caused of this fault is the dried-up/leaky electrolytic capacitor in that section. It will drop the supply from normal voltage and will disable the unit and blinking error appear. Sometimes it has a bulged/dome at the top but not all, it is better that you have a capacitor checker/tester to determine its condition. Also, bad solder joints can produce the same symptom, it is hard to spot, you should use table lamp/portable lamp for finding the cold solder. Secondary reason of fault is the open fuse/fusible resistor in series with the output of regulator IC/transistor, shorted/openRegulator IC/transistor, shorted zener diode(all are in the power supply section) and the microcontroller. Best that you check the output voltage of each regulator to determine where the fault came from and narrow the job.

If you don't have necessary tools and test instruments, and can't do the job yourself, I would advice you to look for a professional to troubleshoot the problem. Don't attempt to work in the power supply if you don't know the safety precaution of handling it, there some stored electricity enough to hurt you with a little mistake only.

Also check if your unit is under warranty /extended warranty, avail it because the manufacturer of your unit will fix it for free. Don't open the back panel, this will void the warranty.

Hope I helped you.

Have a nice day!

Thanks for using Fixya.

Feb 24, 2011 | JVC HD-52G886 52" Rear Projection HDTV

1 Answer

Red light keep blinking on tv


Hi makemoneygre,

This is an indication of out-of-regulation in the power supply section. The very common caused of this fault is the leaky electrolytic capacitor in that section. It will drop the supply from normal voltage and will disable the unit. Sometimes it has a bulged/dome at the top but not all, it is better that you have a capacitor checker/tester to determine its condition. Also, bad solder joints can produce the same symptom, it is hard to spot, you should use table lamp/portable lamp for finding the cold solder. Secondary reason of fault is the open fuse/fusible resistor in series with the output of regulator IC/transistor, shorted/open Regulator IC/transistor, shorted zener diode(all are in the power supply section) and the microcontroller. Best that you check the output voltage of each regulator to determine where the fault came from and narrow the job.

If you don't have necessary tools and test instruments, and can't do the job yourself, I would advice you to look for a professional to troubleshoot the problem. Don't attempt to work in the power supply if you don't know the safety precaution of handling it, there some stored electricity enough to hurt you with a little mistake only.


Hope I helped you.

Have a nice day!

Thanks for using Fixya.

Feb 14, 2011 | Sony KP-51WS520 51" Rear Projection...

1 Answer

SONY KP-61V90 tv will not power on, red light in front,


Its 2 times blink error code that shows +B volt supply (+135 volts) is shorted, most probably horizontal output transistor is shorted, replace it.
If you are good in soldering parts in circuit board then take out horizontal transistor, check it, found shorted then replace it with same number.

Horizontal output Transistor Q502 number is 2SD2578 and available in Part Store for $10
Let me know for further query, if any.
Thanks.

Nov 18, 2009 | Sony Televison & Video

1 Answer

The +[-] 120v (Green light) does not come on at all. The power indicator red light comes on and then goes out in the front, then all the green lights in the back goes out , the only light on is the the...


You most likely have an open fuse on the power supply in the 120v line. That means in most cases your horizontal output transistor is shorted. If it is look around the transistor itself and look for any ceramic disc capacitors that may be cracked or split. If I remember correctly I had a few of those models where I think it was C777 that was basically arcing which opened up the fuse and or shorted the transistor too.

Oct 17, 2009 | Hitachi 50UX58K 50" Rear Projection...

2 Answers

Toshiba 57H81, power to transformer and flyback.


IF YOU REPLACED THE SAME PICO FUSE, YOU PROBABLY HAVE A BAD CONVERGENCE IC AGAIN . DID YOY SNUG UP THE IC TO THE HEAT SINK AND USE THERMAL HEAT COMPOUND ON THE NEW IC'S? ALSO CHECK SOLDER CONNECTIONS TO C810 AND C809 THE FUSE BY THE CAPACITORS MAY BE OPEN.

Jan 22, 2009 | Toshiba 57H81 57" Rear Projection...

1 Answer

Mitsubishi WT-46807


MY FRIEND YOU HAVE A POWER SUPPLY PROBLEM AND MAYBE THE CONVERGENCE IC'S ARE BAD.THERE ARE A FEW TRANSISTOR IN THE POWER SUPPLY THAT HAVE TO BE REPLACED FIRST.




CAYPIANAN@YAHOO.COM

Sep 23, 2008 | Mitsubishi WT-46807 46" Rear Projection...

1 Answer

Toshiba 57H81


Check all fuses in the power supply and look for any bad connrctions on the PCB. You are probably missing the 130 volt supply to the horizontal circuit. Common reasons are: Shorted horiz output transistor; flyback transformer, picture tube arcing , bad power regulator IC. In short, you need to get a qualified tech for this symptom. Hope this helps.

Oct 29, 2007 | Toshiba 57H81 57" Rear Projection...

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