Have TV Questions? Ask a TV Technician
Hi Donald, so STB_5V at pin-1 goes low and high while TV tries to turn On?
How low that volt goes?
I'm sorry, what are you referring as 'kill switch' here?
Lamp door switch is safety switch that tells main processor chip that lamp door is in place and secure. It s just a safety measure to avoid any thing touching to lamp while it is On as lamp gets quite hot.
Standby volts is constant but TV still doesn't turn On is actual issue, is this correct?
What are the LED lights on TV front do when press power button to turn On the TV and when TV fails to power up?
OK, so lamp doesn't fire up, correct?
If so, does TV stay On for longer time or switch Off after few minutes?
If it turns Off, what the front little lights do?
OK, it could be faulty/ broken harness runs from DMD board to Ballast board and bridging the connection makes circuit complete and lamp fires up.
Is it possible for you to check continuity of each wire in that harness to figure out what wire is broken?
OK, take your time.
OK, when lamp turns On when you jump the wire, do you get normal picture on TV screen and does TV stay On?
This is odd and confusing symptoms. Do you still have old DMD and ballast boards and what were the symptoms of TV that prompted you to replace both boards?
Can you please share old symptoms of TV that caused both boards replacement?
Thanks for the info, where did you buy the replacement lamp from and how much you paid for it?
Low price/ cheap lamp wont work.
ah OK, this cheap lamp could be main reason of current problem in TV, as I mentioned in previous reply these low price lamps do not work nor last longer and gives additional problems in TV. I would strongly recommend to put good quality lamp in TV, for example following lamp supplier..
I trust my input will help you out. Please feel free to respond if you have any additional questions.A positive rating to answer would be greatly appreciated, please click on 5 star on this page then click submit/finish button so I can get credit on website for my work. If you don't see rating option then intimate here.Regards,Shahid.
Good question, it seems you ground the error signal pin at ballast board to get the lamp fire up for a while but main processor chip still detects the error by feedback signal from ballast board to switch Off the TV. Error signal comes due to sub par lamp which consume more current than expected. These low price bulbs/lamps are junk/ fake and do not work.
I hope these info will help, please feel free to respond if you have any additional questions.
Do you need any further assistance with this question?