Looking to buy this set from Ebay. Fault is tv comes on + backlights but no picture which i would have thought would be a Tcon fault but from what i can find it doesn't have a Tcon. Could this be a main board fault?
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Re: Sony kdl-40r473a
Ihave the same TV model wich can not start, standby voltage is there, power_on come back from main board but drops immediately to zero.
I have the schematic diagram but I could not identify the cause.
I looked to the circuit of power_on but did not understood who the circuit works and why the voltage dropped down.
I am still in learning phase, I am not expert.
so please help if it is possible dear experts. I will attach the schematic diagram with this post. -
Re: Sony kdl-40r473a
No picture can also be a panel fault.Comment
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Re: Sony kdl-40r473a
well the problem is solved, the power_on coming back from the main board were disconnected to the circuitry where it should go, a line of copper in the power board was broken.
but still no picture, when i approche a light to the screen there is a menu and sound.
seems that the back light is died. any suggession? tnxComment
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Re: Sony kdl-40r473a
What is your BL_ON voltage in standby and power on?I assume no responsibility for any stupid suggestions I might post.Comment
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Re: Sony kdl-40r473a
Plug it in turn it on and report every voltage at cn6401 connector, meter set to 20 vdc, black - probe to chassis ground, report all readings of all connector pins minus grounds, be careful with meter probe to only contact one pin at a time.Last edited by nomoresonys; 01-15-2022, 06:31 PM.Comment
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Re: Sony kdl-40r473a
One of the first and least expensive things you can do when you have an issue is take the powerboard out of the tv, flip it over and look the solder joints over with a magnifying glass if needed, add a little flux to make the solder flow well and add solder to any joints that look even a little suspect. You can practice on a scrap pcb board if needed, careful not to bridge any joints, and always let the board sit for quite a while or discharge the big caps with an appropriate resister before working on it (safety first) to try to keep from getting shocked, it doesn't take 1000 volts to KILL, a lot less can kill, so be careful, it's only a tv.Comment
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Hello everyone,
I've recently been given a Sony 8k Z8H. It's got a white screen with two vertical black bars. At times it's given me the 5 blink Tcon code. Testing voltage on the Tcon I can see some low or missing voltage. I've done a basic visual check of cables and the COF. Not seeing anything obvious. The original Tcon seemed to have good caps until turning it over. On the bottom I found maybe 10 caps with both sides of the caps shorting to ground. I thought ok these caps and likely other components on the Tcon are shorted so let's try a replacement Tcon. I just received the... -
Hi,
i want to repair a Sony KD-75XF9005 TV that initially only showed a grey picture.
Backlight seems to work, Sound (Setup menu after reset) works.
If i dissconnect the left FFC cable from TCON to panel i have half a screen on the right. If left cable is connected always only the grey screen.
Interchanged the cables, its always only the right side that is working. Always grey if left side is connected.
With my small knowledge i would think at least the cables are good.
Can this happen because of a bad tcon board?
Or is it always a bad/shorted... -
Hello all ~
Hope this finds you well. This LG 82UN8570AUD (April 2021 model) 4K UHD television has full audio capabilities but video is compromised / problematic.
When I picked up this large LG tv it had a full black screen upon startup. Previous owner said it just went black one day. No popping sound or anything else of note.
I got the display to work by taping off several traces of the right-hand side ribbon cable on the TCON that leads from TCON to PANEL. However, despite dozens and dozens of attempts to find the right combination / range of traces taped... -
The TV shows a black screen with no image.
TCON ribbon connectors were disconnected individually for image and there was no half image even.
Later both ribbons were disconnected and TCON voltages were tested.
12V, 3.3V, 1.8V were seen present but VONE signal reads 0V.
There is also a short to ground in this circled inductor.
Is this a TCON issue or something else ?... -
Hi,
I have this problem with my Sony 55' AG9.
It flashes 4x.
I have found the service manual, and seems it is the TCON.
Before I buy a TCON can someone check the vid?
Thanks in advance!...
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