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 -
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... -
Hello all!
Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply .
I have a Westinghouse LED TV, model WD48FAB100 that is not powering on. Upon removing the back cover, I noticed a burn mark where the AC cord connects to the power supply/main board. In this model, there is only one board combining the two functions. Previous owner said the TV experienced a lightening strike, but who knows. I checked the main fuse, tested OK. Here are a collection of readings from the power supply ports. Looking for some guidance on what to test/check next.... -
this laptop was damaged by a roof leak at the repair shop that it was at while waiting for a replacement cpu fan. It was given to me to try to save the motherboard which wouldn't power up anymore. The only issue now is that an sot23 marked R1 is missing one of it's three legs. I cannot find schematics for this model but I found a mosfet that has the same label but i'm not sure if it's an actual match. CJ3401 is the one that I found but I have no clue about the true identity of the damaged one.
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