Re: Vizio D55-f2 backlight/power supply 20v/24v rail output high 26v
also this seems like a main board issue
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Re: Vizio D55-f2 backlight/power supply 20v/24v rail output high 26v
the fuse was blown prior to me touching anything. it was a white smd with the letter "Y". i also could not find info on that.
i found a bigger package smd fuse rated at 2a and replaced that. the set worked for approximately 5-10 hours and then fuse blew again
the 5r1 resistor was showing up as a capacitor on my cheap esr meter and showing higher resistance i believe. i still have it i will have to double check...
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Re: Vizio D55-f2 backlight/power supply 20v/24v rail output high 26v
i tested leds with tester to led directly without pcbs and on cn6102 the voltage was higher but each line from connector to strip produced steady voltage on all strips
i did not remove panel to access strips because i am not that good at removing and reassembling lcd without damage
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Re: Vizio D55-f2 backlight/power supply 20v/24v rail output high 26v
please excuse the hackjob of the 15ohm resistor and wire for a fuse i could not find another 5R1 resistor.
when i plug in the connector cn6101 upside down with positive on neg side etc there is backlight and display is working however half does look brighter.
cn6101 is where polarity is reversed...Last edited by Nonya333; 10-05-2020, 11:45 AM.
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Re: Vizio D55-f2 backlight/power supply 20v/24v rail output high 26v
there are 2 outputs to the led lights from the mainboard.
the one with less pins still shows half as positive and half as negative but the output is reversed
positive is showing up on negative and negative on positive
i poked around everywhere i am thinking it is the ic chip that controls mosfets
any help would be greatly appreciated
thanks
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Re: Vizio D55-f2 backlight/power supply 20v/24v rail output high 26v
on the ps board on output there is a power mosfet to the 20/24v power rail/connector to main.
coming in from transformer there are 3 double schotky rectifiers.
there is a heat sink with bridge rectifier and what i am guessing is voltage regulator since i cannot see untill i desolder heat sink.
was your voltage regulator on hot side?
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Vizio D55-f2 backlight/power supply 20v/24v rail output high 26v
no backlight on set.
the 20v rail fuse on the mainboard was blown. i replaced and backlight and tv worked for about a day before flickering and out again
input on mainboard for led should be 20v to fuse but is reading 26v at input and <3v output.
power supply output should be 20v/24v from connector and output is reading >25.6-26v
any suggestions?
i also tested backlights with tester and they were all same steady voltage and on
output switch transisters seem to be reading fine in circuit.
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Re: dell xps schematic la-e331p
Need this too. Did you ever find it?
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