Hello. I have a Sanyo TV that had no backlights at first. I changed CS9 off the power supply and now the backlights will come on for a second or 2 and go right back off. I can see the image if I shine a flashlight in the screen. Anyone familiar with this particular model and problem, your help would be greatly appreciated. Thanks in advance.
Sanyo DP65E34 Backlights off after a 1-2 sec
Collapse
X
Related Topics
Collapse
-
by signal.questHi all,
I have been working on a Samsung LN40C630K1F LCD TV. On power up the backlights only briefly light up when first powered on then they go out (2 seconds to black). The flashlight test also fails. The sound works fine. Please see attached pics.
I have researched the forums a lot. I have watched the videos of trying to locate the bad CCFL or transformer and bypassing. I can't find any evidence of a bad transformer/CCFL. I verified I get 376V from the big caps to the fuse. I have used a small/cheap oscilloscope and it looks like the MOSFETs on the inverter...6 Photos -
by bpcannan'Morning,
I get sound and picture when powering on the TV and its stays that EXCEPT that the left half of the screen will dim every few seconds then return to normal while the right side of the screen performs as designed.
Did the soft and hard reset options pulling the plug, using the reet option in the vizio menu to no avail.
I checked the mainboard - found some popped capacitors so replaced it - but that did not change the situation.
I checked the t-con board. It is getting good power. Then I removed one ribbon cable to see if I could isolate... -
by jesteraceHi everyone I have this TV which was dead one day when I tried to turn it on. I've had the cover off and there was just a pulsating/electrical clicking/ticking noise from the PSU. I disconnected the mainboard as sometimes this works to just fire it up with backlights on? That didn't help. Same noise. Then I disconnected the backlight cable from the PSU and the TV came alive. It appeared to respond to the remote and i'm pretty sure it's fully operational when there is no backlight connected.
However, I am in a dilemma.
I tested the backlight outputs with the lights disconnected... -
by jimbofzHi this vestel 65in tv had classic no backlights ,so nothing new there!
tested with b/l tester and the b/l seemed to be fine
so investigated psu 17ips72 (on this 65inch there are 3 fets and control iv type DB83630P)
did a thorough check on b/l circuit all ok .
When i tried again with b/l tester all ok .but then when i reinstalled psu all worked fine ,
could there be a component on psu that is causing the protection mode to stop b/l
.maybee causing it to be too sensitive?
it seems to me if the b/l have been on with my tester ,within a couple of minutes... -
by lostoneHello, I came here after finding some similar questions asked on other monitors and hope someone here can help me get an ancient Viewsonic VP230mp (23" 4:3 LCD) back to working condition.
First a little background, I have a background in computer and electrical engineering, and I'm smart enough to know I know nothing about LCD displays and how they work. For this topic I'm as green as they come.
When the display is turned on the viewsonic logo displays in the uppper left for 2 seconds then the screen goes black, the power LED is green (on) and when a computer is connected...-
Channel: Troubleshooting Computer Displays
-
- Loading...
- No more items.
Comment