Question about Televison & Video
I Have a daijitsu 32 inch tv that when you power up wont go into standby mode (with red light) but goes straight to green light and wont turn on. i have replaced the power board with no luck
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Posted on Jan 02, 2017
Followed Terryfic's solution. I am a DIYer and managed to order the part, desolder the old one and solder in the new one. However, when I turned it back on I got a black screen with sound. Hmmm, saw the adjustment screws but was hesitant. Ended up turning about 10 degrees one way and presto chango... Saved a $1200 upgrade to HD for a $30 part! Thanks
Posted on Dec 25, 2007
SOURCE: tv stuck in standby
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.
Posted on Jun 11, 2008
tv goes into standby all the time if a power supply is not fine, what happens is that a power supply produces two voltages, one small one powers a standby components and bigger voltage powers a line transformer which later produces more small voltages,
then later cancels the first small voltage.
chec your power supply semi conductors like, transistors, diodes and small value resistors, on your power supply. some power supply uses a IC to oscillate a ht. so check a supply at a w/shop.
Posted on Apr 29, 2009
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.
1Theinternal circuits are jammed because of electrostaticcharges accumulating on capacitors, or because of a wrong voltage readby the main chip on your monitor controller board. this started theprotection circuit.
2 The protection circuit detected a wrongvoltage 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,
All: Appliance parts, electronics parts & more from PartStore.com
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LCD/Plasma Electronic Replacement Parts: Plasma & LCD TVs, Appliances |
On LCD Payparticular attention at inverter and power board, power board can beinspected looking for bulged or leaking capacitors, then tested with amultimeter. The inverter is more difficult to test , there is need toread 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
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