picked up a tv and when the power is plugged, the standby light flashes real quick then goes off. of 3.3, 12, 24v is all there but i couldnt find any 5v on the back-end board. ON/OFF is low, which it seems is what turns on the backlight so i removed the wire at the back-end board and put a 10k resistor to the 3.3v, which when plugged in brings on the backlight for a split second and also a blue light "LED1" on the inverter board, which goes off after a short time.
am i missing something to bring on the backlight or is the inverter/ccfl gone bad? would that cause the inverter board...
jasonbay13
Senior Member
Last Activity: Yesterday, 03:44 PM
Joined: 07-04-2014
Location: pa
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Philips 37HFL5682L/F7 no standby light, incomplete service manual?
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Re: Phillips 55PFL5901/F7 (Serial No. : DS1) Boot Loop
I'm not sure I understand the joke about contacting phillips.
With the flash drive in all I can get the tv to do is continue it's boot loop. I've tried power and menu and home buttons and no difference. -
Re: Phillips 55PFL5901/F7 (Serial No. : DS1) Boot Loop
PhillipsLeave a comment:
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Re: Phillips 55PFL5901/F7 (Serial No. : DS1) Boot Loop
Thanks, but I don't see how to update the firmware if the tv does not power on to where I can bring up the menu. Unless I'm blind, I am due for a new prescription ��Leave a comment:
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Phillips 55PFL5901/F7 (Serial No. : DS1) Boot Loop
Tv powers on when plugged in and displays the phillips logo for about 10 seconds then shuts off and then comes back on to display the logo over and over.
I've read it's possible to upgrade the firmware but I cannot find the site where I read that anymore.... -
Re: RCA LED52B45RQ wont stay on
woo wee!
it exploded in my face!
i was plugging it in to try and read some voltages and q10 exploded.
unfortunately for me there are no replacements for this board and i have no idea what that ic was, or if the power supply board was even at fault though it and the main board both had bad caps.
i guess this one goes in the dumpster unless anyone wants parts.Last edited by jasonbay13; 11-11-2019, 09:54 AM.Leave a comment:
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Re: RCA LED52B45RQ wont stay on
ok, so.... the tv will come on sometimes. and now seems to have a similar problem as the thread i linked in the first post.
plug it in and the red light comes on. press the power button and the tv turns on. anywhere from 0 seconds to 20 minutes the tv will shut off. 5vstb stays at 5v and on/off stays at 4.65v (after tv has shut off).
i've tried forcing on\off and backlight without luck. power supply shuts down.
however, if i leave either the backlight on/off cable disconnected or the led connectors disconnected...Leave a comment:
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Re: RCA LED52B45RQ wont stay on
i got it working. i touched up a few more solder joints and changed out c14 (33ohms) and c5 (2 ohms).
can anyone tell me why c14 is important to have a low esr?Leave a comment:
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RCA LED52B45RQ wont stay on
i have the same tv and power supply board as in the forum thread below, though i have different symptoms than anywhere else i've looked and cannot find a schematic or anything else to help me.
the problem is that the red light comes on and i get 5v at +5vsb but when i press the power button the red light goes out for half a second and the +5vsb drops to 2v or so (almost too quick for my meter to read a drop at all) and the +12v shows 11v or so for a split second and +5v shows 4-5v for a split second.
This is repeatable as many times as you want to press the power button,... -
Re: Samsung un40c5000qf black screen - tcon?
i have an update: i got the new t-con just in case since it really wasnt that expensive. no change.
i have checked the voltage at c105 and c102 and at the fuse. the fuse voltage always stays at 12v (while on)
the c102 and c105 voltage with just the working side plugged in is 15.5v on the meter and when both or just the non working side is plugged it goes to 1.5vLeave a comment:
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Re: Samsung un40c5000qf black screen - tcon?
do you mean the supply voltages at the fuse?
i plugged in my laptop to it and it shows up, though very near the center it started getting discolored, could have been bleed from the white half?Leave a comment:
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Re: Samsung un40c5000qf black screen - tcon?
no. it seems to be the same as when i started....Leave a comment:
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Re: Samsung un40c5000qf black screen - tcon?
so i was looking around and found this post: [url]https://www.badcaps.net/forum/showthread.php?t=44635[/url]
in tom66 says "if you get half a good picture with one half unplugged usually it means there is a short on one side of the panel (i.e. Bad panel.)"
probably a bad idea, but it looked like the two halves of the tcon are the same so i tried putting the right (one that shows an image) and connecting to the left side of panel. i got all black screen. and when i connected the left of tcon to right...Leave a comment:
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Re: Samsung un40c5000qf black screen - tcon?
i just tried one side of the panel at a time. when i pull the left one out the left side goes mostly gray (except left edge it fades to black). right side is black except it says "nal cable." i assume the first part would be "check pa" nal cable.
when i reverse and have the left in and the right out it stays all blackLeave a comment:
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Re: Samsung un40c5000qf black screen - tcon?
dont have the bottom side of the main board or power board since i have not removed them from the panel. i can if needed....Leave a comment:
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Samsung un40c5000qf black screen - tcon?
Neighbors tv is no work: plug in and press power button it makes the startup sound and the backlight comes on but the screen is black. i am not sure if someone has touched it before as the tcon board connector from the main board had the pull clip broke on one side.
i could not find anything with a look by my own eyes.
i am getting 12.8v on both sides of the fuse at the tcon board.
connections appear to be good, re-did connection to be sure.
so, am i right in thinking t-con board or could it be the main board not sending signal, and how would i test?
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hello, did you ever fix that 50h5g hisense? -
Re: Sony KDL-40EX640 horizontal lines and double image
i've seen something similar. : [url]https://www.badcaps.net/forum/showthread.php?p=708528#post708528[/url]
take a look at post #10 for pics of one i had. solution was some pressure at the top of the lcd where the little ribbon goes into the panel. hopefully yours is as simple or more-so.Re: Sony KDL-40EX640 horizontal line...or pics of oneLeave a comment:
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Re: Rca led50b45rq
strange. i've got the same problem? but instead of 50b mine is 42c (42").
but the tv will not return to standby regardless of the led connector. and leds do not light or flash, but i also do not know how many are in series. i get 62v on all four led pins. (i've created my own thread, now on page 2)Leave a comment:
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Vizio M190VA - Dead, but has power
Got a small 19" vizio that does not power on and no power indication. voltages on 5.2v is 5v and 16v is 19v. had plugged into my watt meter and says it is drawing 12 watts. if i unplug the connector to the main board the power drops to less than half a watt and voltage on 5.2v is 5.5v and on 16v is 15v. led 42v has same as 16v readings.
i smelled heat coming from the board and found what looks to be an smd diode? d501. and the ic next to it, u502 was very hot. on the backside you can see the heat mark. looking like my only solution here is to buy a new main board but i want...Last edited by jasonbay13; 03-11-2017, 03:04 PM.
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