Instead of order the motherboard try to fix myself to save $100...The estimate is at 3.....
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Last edited by capwizard; 12-27-2016, 03:17 PM. -
Re: 60LN5400 Q409 burn
The SMD Codebook
http://www.marsport.org.uk/smd/mainframe.htm
It shows Q409 maybe is this:
X7 BZX84-C47 Zet C SOT23 0.3W zener 47V±5%
X7 CMDZ5227B CSC I SOD323 250mW zener 5% 3.6V
Q407 shows is this MMBR901 SOT23 npn RF MRF901.
Service manual only found this 55LN5200UB, i cant see its bury....
Attached FilesLast edited by capwizard; 12-27-2016, 04:39 PM. -
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Re: 60LN5400 Q409 burn
Service manual I found it! i am so cheap don't want pay nothing...
http://service.minjja.lt/files/?id=5982
https://www.manualslib.com/manual/79...e.html?page=52
Q409 is AO3407A 30V P-Channel MOSFET:...........................
https://cdn.badcaps-static.com/pdfs/...fa1ec3aa2d.pdfAttached FilesLast edited by capwizard; 12-27-2016, 05:50 PM.Comment
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Re: 60LN5400 Q409 burn
Bad news, the Q409 is a switch for panel_Vcc, I doubt about TV panel has A short, need to find the pinout, then check the short.
PS: I checked it has 121 ohm between tv chassis ground to panel_Vcc ( from T-con board), look like has A short to me.
Attached FilesLast edited by capwizard; 12-27-2016, 06:13 PM.Comment
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Re: 60LN5400 Q409 burn
I have this same tv, 60fn5400, on the right side of screen, it does show picture but its in a sodt of white box? Have you ever sceen this?Comment
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Greetings everyone,
I have a HANNSG Hi221 monitor that exhibits two seconds to black issues (backlight goes off, display is still on as confirmed by shining a flashlight on it) with some additional oddities...
The monitor failed on me with a standard "2 seconds to black" some time ago prompting me to initially replace most of the electrolytic capacitors (some of them were bulging/leaking).
Things kinda sorta worked for a night, then the problem returned along with some flickering and "buzzing" noises.
Upon closer inspection... -
Eventually discovered a burn mark near lower corner of LCD. Here is a summary- Backlight on, no image
- Disconnect right buffer board (view from front), left side display comes on
- Masked off pin 7+8 (both ~12,5v on both left and right buffer board) from t-con to right buffer board (view from front) display works but have some lines
- Buffer board is pretty simple
07-11-2025, 04:04 PM -
I have an AOC U27G3X 4K gaming monitor that I use both as a TV and for gaming on a Nintendo Switch 2 console. Recently, something very strange has been happening to it. After playing a game that has an on-screen timer for a few minutes, the last digit of the timer (the one rapidly flickering from 0 to 9) appears to burn in on the monitor. Going to a different source or power cycling the monitor does not help; there is a constant flickering area on the screen where that digit was.
It seems strange that only that digit would burn in, and NOT the other digits that are changing less frequently....10-23-2025, 04:33 AM -
Hi All,
I'm trying to repair a PCB that has some surface mount SOT23 devices that apear to be transistors but testing them on the board are giving confusing results.
Its named FS45 but I can't find a datasheet that seems correct.
The device is used in 10 places on the PCB. In 4 cases they appear to be controling triacs and the attached picture it shows it connected to a BT136 triac with the FS45 connected to the gate leg of the BT136.
Can anyone identify the device and suggest an alternative?
Many thanks.
PS: I have... -
Hi,
I've searched the internet but couldn't flnd a replacement/substitute for this part.
It is marking as "2920N" SOT23-5 case.
I am looking for the "G2920T11U" 3.3v version.
Also uploading the datasheet.
Thank you all....
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