I have a Samsung LN46C600F3FXZA TV that the picture stopped working black screen sound OK. Then it progressed to no sound, no picture. Checked the capacitors and none are bulged. Next thoughts?
Is the TV totally dead now, no standby light?
Testimonial: "Larry there is no sound, no picture, no background light. The red standby light comes on in the lower right corner. Used a flashlight on the screen and can not see any images in the dark screen. This set had not been used for several months prior to the happening."
SOURCE: how hard it is to replace by yourself main board Samsung LN-T4065
You need to do some more diagnosing of the problem. If you get sound and change channels take a bright flashlight and place it again the screen. Look for an image around the edge of the flashlight.
If you see an image that means the LCD controller board (TCON) is probably good.
The problem is probably one of three causes;
1) Inverter board is bad
2) CCFT (cold cathode fluorescent light) are bad.
3) Power to the inverter board is bad. You can also check the connectors.
SOURCE: Samsunb 4051: TV screen turns off sound stays on.
Most likely this set has an "integrated" inverter, as most samsungs do--and this DOES sound like an inverter problem. Make SURE thought, there are no more bad "10 volt" caps on the power supply...ALL of them need to be replaced no matter HOW they look.
SOURCE: Samsung LN52A550P3FXZA LCD had clicking
Hi.
If there are very faint picture in background, then the back light system is not working. That means that problem is either inverter powering the lamps with AC, main controller board managing the inverter, or PSU providing primary DC voltage to the inverter.
In your case the PSU was defective. The damage may have concerned more components apart the capacitors (resistors, more capacitors, solder joints etc.). Testing is done tracking voltage to inverter. The first thing to test is voltage to inverter from PSU. A general procedure is described here.
This test is done reading the DC voltage from the PSU to main controller. A malfunctioning controller board may not turn on inverter. Voltage in input and high voltage on inverter must also be checked. Voltages to check are 120VDC at CN801 on IP board (inverter power board) and DC B13V,B12V,B5V Voltages at BD105L,C1261,BD101 on PSU. For safety reasons testing with power on must be done by a trained person.
To make things easier, the whole service documentation has been uploaded here.
Here parts for this TV.
Regards.
Ginko
SOURCE: I have a Samsung A550
Hi,
Yes this fault was caused by faulty electrolytic capacitor in the power supply board. Leaky/dried electrolytic capacitor will dropped the output voltages and will disable the unit. In the first stage of the symptoms, warm-up will make itself stable after powering on and of the power supply but it will get worst, time will come that the unit will not even power up.
If you haven't saw the capacitor with bulged/dome at the top, this is not mean that they are in good condition. Dried electrolytic capacitor has no physical indication of fault unlike the leaky one. You must have a capacitor checker to determine its condition. If not available, you may replaced all of them in the power supply board or just replaced the entire board rather than troubleshoot it.
Let me know if you need further assistance.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.
Kolbrun
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