Question about Toshiba Televison & Video
TV is about 2 1/2 years old. When working, looks great, sounds great! Could it be a power supply going now gone bad?
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Posted on Jan 02, 2017
SOURCE: no power
Bring your Tv to Micro Electronics
1515 Britannia Rd E, Unit 12
Mississauga Ontario, L4W 4K1, CANADA. ask them to chek it out, they are the best, they will let u know is it possible to fix or not, how much its gonna cost you, if its fixable and can get the parts you will get the tv in ur hand next day. call them 905-565-6595
Posted on Nov 11, 2007
To start, the module with the blown fuse will have to be replaced. The rest of the boards will have to be verified to know which other ones may have been the cause of the failure.
You will have to give the set out for factory service to have it working again.
Posted on Jun 06, 2008
> checked voltages meter set to AC referenced to chassis VA, VE, etc no voltages.
Do not try to measure voltages on the primary side of the power supply with a meter; you may damage the meter and cause new damage to the supply. There are switching frequencies somewhere between 50,000 - 100,000 Hz and possible voltage peaks of several hundred volts.
Checking AC is only useful before a diode bridge that converts incoming AC into raw DC that is then chopped at higher frequency into an approximate HF AC, coupled to the secondary, then tapped and connected to more diodes to produce DC, finally regulated and sent on its way.
Your plasma set uses some higher voltages that could have caused the cracking sound they heard but the DVD player didn't cause the problem directly; maybe just caused the HV for the display to surge for a moment.
You may have additional fuses on the secondary side of the supply. If test points are accessible there, check for DC voltages and be suspicious of any fuse or test point that measures nothing at all.
I can't tell you which voltages to expect since that varies from one design to another but you should find several lower voltages such as 5 VDC for logic circuits and perhaps a 12 V point. The plasma's HV could be produced from a separate board fed from the AC line or get its supply voltage from the main supply. There aren't many standards to rely on here.
The most likely semiconductor failure would be on the secondary side and diodes come in many different packages, many cylindrical, some in the TO-220 package with a metal flange and mounted on upright aluminum heatsinks. These will have only two leads and there will be some in the same package with three legs. The latter can also be checked statically but unless you know what kind of transistor or regulator (look about the same) you are measuring, you will not be able to ferret out a defective one with any luck.
While you have the set open, check for any dust bunnies that can act as sponges, collect moisture and create a discharge path for higher voltages.
Posted on Dec 27, 2008
Found this troubleshooting method on the www.Toshiba.com website. Q. My TV has a picture, but there is no audio?
Models: 20DL77, 20HLK67, 26HL47, 32HL17, 37HL17, 42HL17, 26HL37, 32HL37, 20HL67, 26HL67, 32HL67, 37HL67,
42HL167, 42HL67, 47HL167, 52HL167, 42LX177, 46LX177, 52LX177, 57LX177
1. Please check your connections and make sure if you are using COMPOSITE “yellow, white, and red cables”, SVIDEO,
with “white, and red” or Color Stream COMPONENT “green, blue, red, white and red cables,” that the white
and red cables which are used for audio are plugged in securely into the same inputs as the video.
If your connections are secure, the station may have broadcast difficulties. Try a different channel.
2. If you are using the coax cable from the wall, press the “ENTER” button on the middle of the remote. If the
information provided shows that you have SAP selected we will need to change it to STEREO or MONO. To do
this, we will need to press the “MENU” button, and use the RIGHT or LEFT arrow keys to highlight the AUDIO
menu. Next we will need to use the DOWN arrow to select AUDIO SETUP press “ENTER” and then arrow down to
MTS and use the RIGHT arrow to select stereo.
3. If you have a cable box or satellite receiver, please make sure the TV’s volume, as well as the box’s, volume is
turned up sufficiently.
4. The station may have broadcast difficulties. Try another channel.
5. The sound may be muted. Press VOLUME.
6. If you still have problems after following these steps please contact Customer Solutions at 1800-631-3811 Monday
through Friday 8am to 7pm CST. The Toshiba customer service number is 1-800-631-3811. I hope this helps you with your problem.
Posted on May 17, 2009
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