Toshiba 42hl167 no picture sound ok

Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Check the power going to the inverter board (24V) if ok...replace Inverter board....

Check If there is a backlight?
With Backlight, With sound....Main Board
No Backlight, With Sound.....Power supply (24V) or Inverter Board (Capacitor)....

hi,
There is problem with the back light of your tv. In LCD tvs CCFL are used as back light to give light to independant pixels. CCLF lamps required high voltage to light. This high voltage is provided by the inverter board inside ths tv. If any one of the chopper transformer (high voltage transformer) have some problem then the inverter will shuts off itself preventing damges to the power supply.

You have to check the 24V from the power supply. If its ok the you have to check the inverter board.if avilabe replace the same. if you are not able to do the same i will prefer to consult some one experienced in it. Back light inverter board will look like one in the picture.

ok

hello, usually in that case, the cause to the failure, is the inverter board. but first you have to chek the 24v that should be supplied to the inverter. if the voltage is ok. then you should replace the inverter board

not true at all. I would try to look on the power supply first for popped capacitors that supply the 24v rail for the backlight inverter.

Having sound is a positive when it comes to repair. This means that only your screen is not lighting.

If you repair the 24v line and check the 5v feed also going to the ps_on (on) the backlight inverter and you still have no picture...you will need a new inverter.


Hope this helps!

You're backlight inverter is faulty.

You first need to check your power supply and ensure you have 24v output to the backlight inverter.

If you lack the 24v you will need to replace capacitors in-line to the 24v rail to get power back to your backlight inverter.
Look for these:


If your 24v is OK then you will need a replacement inverter to restore your picture to your tv.



Best of luck!

Please rate!

your inverter is developing a problem or master processor has some flaws occurring. you may want to get it serviced before it becomes a serious issue.

Sometimes the picture goes out but the screen is still lit(backlight on), if totally dark like TV was turned off then check voltages in the power supply board(24v, 12v, 5v) if all ok replace the inverter.

You could have a defective screen - a defective inverter or a CCFL lamp.
To determine if you have a LCD screen problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:

• Screen flashs on red/pink and off.
• Picture stays on in red and slowly be come normal.
• Picture flickering with dim display.
• Picture flickering on and off.

All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.