Good Morning All.
After searching for my model number and finding a different inverter set from the one installed in my TV and with a different problem I thought I'd post for help in a nerw thread.
I have an LG 37LF65 which I bought on Friday, The seller said that the TV had sound but no video. It appears to have no damage to the Screen. When powered up I can't see anything with a torch although my light isnt the best and I don't know where the OSD is on these TVs.
I opened the rear and found that there were two leaking caps 680uF @35V on the inverter board and replaced them with good Low ESR caps.
I then powered up the TV and got nothing at all. Green light flashes about 5 times, then stays illuminated green. Nothing on the screen with torch. No flash from the backlight.
I checked all other caps in the TV (main PSU board mainly) and replaced any with an ESR above 0 on my Atlas ESR Meter with a new lower ESR version, Marking each one with a pen mark as I went.
Powered up again and still found nothing.
All voltages coming from the Main PSU board are present and correct to labels, I'm seeing a VSync square wave signal coming from the TCon board@ about 100Hz, 24V is present to the inverter board.
Other voltages are as below:
Option pin from TCON: Seems to be sending Data to the Config chip during startup and shutdown
ADIM
ON/OFF
BRT
Status
All sit low when powered off (and discharge from on fairly slowly)
When powered all lines are pulled high to 24V.
I've checked all 4 of the the FETs and none show short.
The input winding to the transformer is at about 0.2 ohms and the secondary is about 150 Ohms.
I have a 16W 16CFLD4 but i'm sure its just a standard fluorescent tube rather than a CCFL. Will I be able to test my inverter with this?
This all appears (Granted to someone new to this) as looking ok?
Am I looking at a CCFL failure?
After searching for my model number and finding a different inverter set from the one installed in my TV and with a different problem I thought I'd post for help in a nerw thread.
I have an LG 37LF65 which I bought on Friday, The seller said that the TV had sound but no video. It appears to have no damage to the Screen. When powered up I can't see anything with a torch although my light isnt the best and I don't know where the OSD is on these TVs.
I opened the rear and found that there were two leaking caps 680uF @35V on the inverter board and replaced them with good Low ESR caps.
I then powered up the TV and got nothing at all. Green light flashes about 5 times, then stays illuminated green. Nothing on the screen with torch. No flash from the backlight.
I checked all other caps in the TV (main PSU board mainly) and replaced any with an ESR above 0 on my Atlas ESR Meter with a new lower ESR version, Marking each one with a pen mark as I went.
Powered up again and still found nothing.
All voltages coming from the Main PSU board are present and correct to labels, I'm seeing a VSync square wave signal coming from the TCon board@ about 100Hz, 24V is present to the inverter board.
Other voltages are as below:
Option pin from TCON: Seems to be sending Data to the Config chip during startup and shutdown
ADIM
ON/OFF
BRT
Status
All sit low when powered off (and discharge from on fairly slowly)
When powered all lines are pulled high to 24V.
I've checked all 4 of the the FETs and none show short.
The input winding to the transformer is at about 0.2 ohms and the secondary is about 150 Ohms.
I have a 16W 16CFLD4 but i'm sure its just a standard fluorescent tube rather than a CCFL. Will I be able to test my inverter with this?
This all appears (Granted to someone new to this) as looking ok?
Am I looking at a CCFL failure?
Comment