Re: Toshiba 40XV645U shutting itself off
Sorry to ask this here but do you have the service manual for this tv?
Sorry to ask this here but do you have the service manual for this tv?
-
-
Re: Toshiba 40XV645U shutting itself off
I had the same problem with the +24 volts supply, but I was not willing to take the chance to buy a $50 board since I got the TV for free, just in case the PS board was not the fault (I had read on YouTube that one or more of the CCFLs may be old and drawing a heavy current). Since QE871 (on the back-side) was burning the board, I bought an SI449ADY and replaces QE871. That cured the problem.
Comment
-
Re: Toshiba 40XV645U shutting itself off
Thanks Merchison. I just wanted to say that this fixed my issue as well.
My Toshiba 40XV645U had a failed backlight inverter, diagnosed by having a picture, on-screen display, etc., but no backlight. After opening it up I confirmed the failure by testing the MOSFETs and fuse on the inverter board.
I ordered a backlight inverter and it fixed the issue, kind of. I had a back light, but the TV would soon restart itself automatically once it got a bit warm. First it would take a few minutes, then it would power cycle every 20 seconds or so. I could prolong the time to power cycle by decreasing the backlight in the menu.
After finding this thread, I replaced the MOTFET on the underside of the power supply board and it seems to have fixed the issue more permanently. Time will tell I guess.
Just one quick correction though. The part number is SI4459ADY. Just a small typo in Merchison's post.Comment
-
I just got this tv today and it appeared to have no backlight on. After taking off the rear cover and checking again in the dark I can see that MAYBE one quadrant is lit.. But still it's quite dim. I was going to check the LEDs with my tester, and I found LED 1 and LED 2 + pins on the wire from the inverter, but I couldn't identify a ground. Nonetheless I tried using a mounting screw on the inverter board and also the chassis as ground but regardless my tester reads 300 which is what it reads when there is no voltage draw.
I don't know how exactly to test the inverter itself. Is it... -
Hello, 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... -
I have a tripp-lite aspint 3636vr inverter charger which blow some of mosfet transistors. I replaced them repaired also the driver circuit and tested but the mosfets burn again.
It work very well as inverter and also as charger if I let the rear switch in auto mode (inverter) and charger only(charging) but in auto when I connect the feed line 220V AC first time it pass ok to line and start charging the batteries but when I remove the feed line it pass to inverter mode and if I do it again the second time when passing from charging to inverter the Main transformer start making a...03-06-2023, 07:07 AM -
For some reason I'm just not going to let this 19" TV defeat me. I guess because I have a schematic to work from I feel like I'm oh so close.
History- while adding a turn-on circuit I let a small screw roll under the power board. Worked through all of that circuitry, probably replacing a MOSFET and PWM controller that were not bad but I was following the service manual. Finally figured out that the power supply is in working order when the inverter section (for the backlights) is disconnected. When the +12 supply to the inverter is disconnected the +12 and +5 will come up... -
If I had a solar fed grid tie inverter (GTI), a modified sine wave inverter, and a power outage occurred, what would happen if you disconnected mains, backfed the modified sinewave inverter (MSI) into house power, and hooked up the GTI to the output of the MSI, would it work?
Next thing is trying to charge the batteries using solar power, but that's another issue ...
Comment