Hello guys.
I recently got a TV that has the following problems:
I am at the beginning of my repair hobby. I can only guess that if that diode is faulty, that the PWM signal is getting messed up for that transformer that maybe drives a voltage for the mainboard and influences the picture quality or makes it flicker.
I do not know how to check the TCOM board for faults. I have read on the internet that others have similar issues, but they think it is not that diode because it is a two way diode? It was a french forum I had to translate, so not everything was understood.
At this point I don't know where to go from here. Can anyone help me out?
See attachments for further inspection
(IC Datasheet, pictures of everything)
I recently got a TV that has the following problems:
- Sometimes it has to be turned on and off a few times, to boot up. Sometimes it starts from the first try
- When it is running normally, the right side of the screen flickers. Sometimes it is just a square of transparent white maybe a 1/3 of the right half (top right)
- The flicker is also sometimes a square that is filled with lines
- I noticed that when the TV brightness is set to max, it flickers less. I think the Standard setting is the worst where it comes more frequent
- When it runs a few minutes it gets better, but still presists and is bareable
- The flicker you can see in the picture attached, is a pattern of lines and sometimes just those white 50% transparent short flashes
- all ribbon cables and panel boards seem ok
- Mainboard had no visual faults, the heat sink gets very warm though, I dont know if this is normal
- The PSU seems ok, but there is a IC FSB127H (U501) with a diode (D501) nearby. The diode has continuity in both ways when unsoldered. I unsoldered it and it doesn't have continuity in both ways. Is that normal? The diode says T2D22.
- The PCB around the diode has darkened a little but when running it doesn't get hot, neither does the IC.
- The TCOM board (if it is a TCOM board) seems perfectly fine from visual inspection but it gets very warm.
I am at the beginning of my repair hobby. I can only guess that if that diode is faulty, that the PWM signal is getting messed up for that transformer that maybe drives a voltage for the mainboard and influences the picture quality or makes it flicker.
I do not know how to check the TCOM board for faults. I have read on the internet that others have similar issues, but they think it is not that diode because it is a two way diode? It was a french forum I had to translate, so not everything was understood.
At this point I don't know where to go from here. Can anyone help me out?
See attachments for further inspection
(IC Datasheet, pictures of everything)
Comment