Hi everyone!
Since my town is covered in snow i thought, hey, I'm gonna try to fix my TV. The initial problem occured after I fell asleep with the TV still on, and when I woke up there was nothing but darkness. I tried all the janitor solutions (restart, unplug, plug back in, knock on it, swear etc.) and soon discovered that wasn't gonna work, so I learned that I could do a flashlight test.
Said and done.
The image was there though there was no backlight, so I youtubed hundreds of ShopJimmy videos and finally opened my tv and tried to kick start
the backlight according to this video: ShopJimmy on Youtube , the voltages looked OK (I'm no expert though), but there was no backlight so i took a shot and ordered a new PSU board from ebay.
The broken PSU had the part number: 272217190167 so i ordered the only one on ebay that matched.
Image: OldPSU
When it arrived I saw it was not exactly the same but it had the same connections and i figured it was a newer version
or something like that, this had the part number: 272217190246
Image: NewPSU1
Anyway, I installed the new one which fitted perfectly, and when I turned it on it flickered a bit and then I saw the light. The backlight that is.
After I high fived myself several times my girlfriend said that there was something dark on the screen, at first i didn't see it
but when a bright scene appered I saw the dark smudge. Curtains down.
So.. now i have backlight, but with a dark smudge covering the lower right part of the screen that wasn't there before, and if I look closely at the dark part i also flickers a bit. But only that part. The rest is perfect.
So i just started to check the settings and discovered that if I change the image settings to "Dynamic" the whole screen flickers
plus there is a loud high pitched "WHEEEEEEEEEEE" coming from this yellow thing on the board. The sound almost disappears
when i choose another image setting, for example "Game". Before everything, I could use "Dynamic" without any issues.
Image with the yellow thing marked out: NewPSU2
I also checked the voltages on the new board and didn't find anything suspicious (First time I measure a TV, wouldn't really
know what suspicious is), but then i got a little head bent
when i saw that the little info text (Seen on NewPSU3) "12Vssb: 12.3V..." and my measure gave 12.02V.
The other readings were as follows according to image NewPSU3
From the top down
POK: 2.98
NC: 0
Boost: 1
DIM: 3.2
BLON: 2.94
GND: 0
GND: 0
12V: 12.02
12V: 12.02
---------------------
NC: 0
GND: 0
Vsnd: 24.4
12V: 12.02
12V: 12.02
12V: 12.02
STB: 0,03
--: 3.3
I also tested to kickstart the backlight with the new board to rule out the main board and i could see through the tiny holes on the back that the backlight is a little dimmer behind the darkness even with only backlighting.
I have tried bending the panel, tapping here and there and "massageing" the pixels, nothing happens. Darkness and flickerness remains.
Any ideas on how to, if possible, fix this? Is the dark flickering area and the wheezing with "Dynamic" setting correlated or two different problems?
I am equipped with a digital multimeter and a patience beyond this world.
Thanks!
Video of the problem
Since my town is covered in snow i thought, hey, I'm gonna try to fix my TV. The initial problem occured after I fell asleep with the TV still on, and when I woke up there was nothing but darkness. I tried all the janitor solutions (restart, unplug, plug back in, knock on it, swear etc.) and soon discovered that wasn't gonna work, so I learned that I could do a flashlight test.
Said and done.
The image was there though there was no backlight, so I youtubed hundreds of ShopJimmy videos and finally opened my tv and tried to kick start
the backlight according to this video: ShopJimmy on Youtube , the voltages looked OK (I'm no expert though), but there was no backlight so i took a shot and ordered a new PSU board from ebay.
The broken PSU had the part number: 272217190167 so i ordered the only one on ebay that matched.
Image: OldPSU
When it arrived I saw it was not exactly the same but it had the same connections and i figured it was a newer version
or something like that, this had the part number: 272217190246
Image: NewPSU1
Anyway, I installed the new one which fitted perfectly, and when I turned it on it flickered a bit and then I saw the light. The backlight that is.
After I high fived myself several times my girlfriend said that there was something dark on the screen, at first i didn't see it
but when a bright scene appered I saw the dark smudge. Curtains down.
So.. now i have backlight, but with a dark smudge covering the lower right part of the screen that wasn't there before, and if I look closely at the dark part i also flickers a bit. But only that part. The rest is perfect.
So i just started to check the settings and discovered that if I change the image settings to "Dynamic" the whole screen flickers
plus there is a loud high pitched "WHEEEEEEEEEEE" coming from this yellow thing on the board. The sound almost disappears
when i choose another image setting, for example "Game". Before everything, I could use "Dynamic" without any issues.
Image with the yellow thing marked out: NewPSU2
I also checked the voltages on the new board and didn't find anything suspicious (First time I measure a TV, wouldn't really
know what suspicious is), but then i got a little head bent
when i saw that the little info text (Seen on NewPSU3) "12Vssb: 12.3V..." and my measure gave 12.02V.
The other readings were as follows according to image NewPSU3
From the top down
POK: 2.98
NC: 0
Boost: 1
DIM: 3.2
BLON: 2.94
GND: 0
GND: 0
12V: 12.02
12V: 12.02
---------------------
NC: 0
GND: 0
Vsnd: 24.4
12V: 12.02
12V: 12.02
12V: 12.02
STB: 0,03
--: 3.3
I also tested to kickstart the backlight with the new board to rule out the main board and i could see through the tiny holes on the back that the backlight is a little dimmer behind the darkness even with only backlighting.
I have tried bending the panel, tapping here and there and "massageing" the pixels, nothing happens. Darkness and flickerness remains.
Any ideas on how to, if possible, fix this? Is the dark flickering area and the wheezing with "Dynamic" setting correlated or two different problems?
I am equipped with a digital multimeter and a patience beyond this world.
Thanks!
Video of the problem
Attached Files