Question about Televison & Video
Have to be very careful in the service menu, hard to help without the full model number.
Posted on Oct 22, 2019
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Posted on Jan 02, 2017
SOURCE: BLACK SCREEN, AUDIO OK
I have samsung 40" LCD tv and it's happening the same thing. I turned it on and it last for 5 minutes and the screen went back but the audio is fine. I turned off and turned it back on it worked fine but an hour later it happen again.
Posted on Jan 16, 2008
You most definately have bad capacitors in the power supply. try and get it repaired as soon as possible, not an expensive repair that iv'e seen.
Posted on Feb 04, 2009
SOURCE: Samsung plasma all black screen
Black Screen come from three areas. 1- Power Supply Board 2- Inverter Board 3- Processing Board on the LCD. Since the Power Supply Board was replace, it easy to troubleshoot where the problem. lies If you cannot get the backlight, then its the inverter board. If you can use a flash light on the TV screen and can barely see the images, then the problem is indeed the inverter board. If you cannot see any images when using a flash light, then the problem comes from the LCD processing board. Let me know if you have any success. Mike
Posted on Feb 21, 2009
SOURCE: Polaroid LCD TV TLA-4641C
If the TV goes in standby, then it is in protection mode.
Ensure also that the fault is not coming from a faulty receiver box sending
bad signal, check if you get same problem on DVD with no receiver box
Try first leaving the TV power cord unplugged for some times, let say one hour or so.
The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible causes.
1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.
2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , starting the flashing light.
If you are in situation one, then the TV will reset just unplugging power cord for one or two hours,sometimes even minutes.
If you are in situation 2 , then there is an internal fault.
If under warranty contact the manufacturer ringing the number on the user manual
If you want to repair at your own expenses, just locate any good qualified repairer.
If you want to DIY you find parts here,
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LCD/Plasma Electronic Replacement Parts: Plasma & LCD TVs, Appliances |
On LCD Pay particular attention at inverter and power board, power board can be inspected looking for bulged or leaking capacitors, then tested with a multimeter. The inverter is more difficult to test , there is need to read voltages, should be done by a tech. Also the LCD controller board can cause same problem
On Plasma, test Sustain (Ysus/Zsus) / Buffer boards , cables to plasma, digital board and power board.
On Rear Projection : check lamp, lamp ballast, power board, and convergence.
On CRT TVs, check ballast , flyback transformer, CRT, Tuner, Convergence.
Posted on May 05, 2009
Your inverter circuits and/or power board need servicing.....
Either three fault scenarios are happening:
1. the inverter circuits are not producing AC ripple too the CCFL lamps that illuminate the LCD glass panel.
2. the power supply board is not feeding 24vdc - 12vdc sustain voltage too the inverter circuits. Meaning, no dc high voltage output from the power board.
3. The timing control circuit (LCD Board) has shorted switching devices or on-board memory has failed....which causes data/dc loss at the input which results in the inverters canceling load power (lamps). The sync data between inverter and LCD Board are absent. This will result in a 'NO LIGHT' condition on the LCD display.
Number 3 is a rare case, its usually #1 the inverters need servicing.....
Posted on Nov 10, 2009
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