I have a Thomson tv, model 32wf400 g, the television is stuck in standby. When I turn the system on it will try to start up and it keeps clicking and the light changes from red to the orange start up but than back to the red. It will not get out of the standby mode. Can you tell me why, and how do I fix it?
Exact same problem with a Memorex MT2025, especially the "clicking" sound. When I turn the system on the power light will turn green immediately followed by about 1/2 second of clicking, and then it goes right back to standby. The TV is only 5 months old, and replaced a Magnavox I had for 26 years.
Your problem is in the switch mode power supply or the horizontal out circut.
sometimes the small CHOKE that feeds the base of the horz. out transistor has a cold solder joint.
resolder both ends first.
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Hi, When a TV is stuck in standby mode often means that there is a problem with its power supply or even in the horizontal output circuitry. May be a component with short-circuit in the RGB output driven by the flyback transformer or a rectifier diode in the power supply output. I hope having helped you.
There are two possibilities for that symptoms, Either standby power supply becomes low (less then +5 volts) so system control chip lose its function OR system control itself stops its function. Unplugging TV resets system control and it starts work again. First confirm standby supply is OK, if found good and correct +5 volts, then replace main board that has system control chip. Let me know exact model number of your Sony TV written at back to find out boards and prices. Thanks.
You must have the tv on standby, that is why when you try to switch on decoder/dvd player.
Most common fault on a Thomson tv would be dry joints (bad soldering) mainly around hot and high voltage parts, eg transformers and high voltage transistors.
Unless you are into electronics field, know the safety procedures and have good soldering iron, take to a repair shop.
I have very little knowledge of TV electronics but I have worked on other electrical devices,
I had a very similar problem with my Thomson 32" TV (I had a whistling noise before it went into standby). and am pleased to say I have cured the problem myself!!
If you have a soldering iron and the ability to use it I will describe what I have done.
Obtain access to the main printed curcuit board (I left my TV unplugged overnight to enable any residual power to subside). on the main board (on mine upper left 1/4 of board looking from the back) you will see a circular group of solder joints (about 9 or 10 joints) that appears to be the main component that connects the curcuit board to the screen,check these joints to see if they have gone dry (they will appear to have a ring around solder joint)if so you might have found your problem, desolder these joints and remake with a good quality solder joint.
I carried out my repair 5 days ago and am pleased to say my set has not gone into standby since.
best of luck