Re: Insignia NS-42L780A12, no backlight.
Does this help at all?
Does this help at all?
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this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even... -
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... -
Hello, I bought a Grundig 55 gut 8768_55 (chassis gf) as a defect βblack screen.
Now I have started with the basics:
Fuse intact, LED Tester says 123V, BL Cap has 140V, Mainboard to PSU 12V, 24V, 3.3V and 5.2V are avail+able, 12V and 3.3V at TCON (TV has no seperate Tcon)
As soon as I switch on the TV, it shows backlight, but a small grey line which disappears again.
When I tap Menu, the background light becomes brighter. What can I assume is wrong with the TV?
A defective mainboard? Or a software problem?
I would be glad of help.... -
hey guys,
i bought 2 samsung odyssey g9's for a decent price. they both have the exact same fault. when plugged into a power source, the blue led powerlight shows, but when turned on there is no picture, no backlight, no menu, nothing. when plugged into a laptop the laptop recognises the monitor, but keeps disconnecting and reconnecting.
dont have any schematics or diagrams unfortunately. any ideas?
thanks
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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...
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