Re: Telefunken power supply m538.b138
I'm just asking if anyone happens to have a schematic for this board. Don't see why I need pictures for that.
GMAN6325
Gman6325
Last Activity: 02-17-2024, 06:03 PM
Joined: 03-07-2023
Location: Lafayette, Louisiana
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Telefunken power supply m538.b138
Trying to find the schematics for a Telefunken power supply board # m538.b138. If anyone happens to have this, it would help me out. This is for a Manta Tv. -
Re: Tv Philips 47PFL3188H/12 (chassis tpn10.1e la) No led No power
I'm pretty sure the 3.6v is your stby voltage. I would try jumping the 3.6v to the on/off pin. I bet that the main board isn't sending signal to on/off pin to turn it on. I just had this issue on a Samsung. Ended up being the CPU on mainboardLeave a comment:
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Re: LG TV 49LW5700 does not power no Standby Voltage(PSU EAX62865401)
Interesting.Leave a comment:
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Re: LG TV 49LW5700 does not power no Standby Voltage(PSU EAX62865401)
Well I have the TV up and running. I decided to do the reflow because the tv is old and not even worth paying $100 for a new mainboard. I added flux around bga chip and other chips. I slowly heated each chip and gentlty pressed down on chip every so often. After doing this, I re-installed the mainboard and voila. The TV works. Not sure how long it will last but hopefully the solder melted enough and the chip has a better connection. Thanks for all the suggestions.Leave a comment:
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Re: LG TV 49LW5700 does not power no Standby Voltage(PSU EAX62865401)
So I redid the jumper test with main board unplugged and my backlights came on. So now I know it's the mainboard. From what I'm reading, it really can't be fixed other than the baking/reflow. Any other suggestions?Leave a comment:
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Re: LG TV 49LW5700 does not power no Standby Voltage(PSU EAX62865401)
I forgot to mention the Eroor voltages. 0v when in stby and 2.1mV when powered on.Leave a comment:
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Re: LG TV 49LW5700 does not power no Standby Voltage(PSU EAX62865401)
Good to know. Do you think I should remove front and check the LED strips individually?Leave a comment:
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Re: LG TV 49LW5700 does not power no Standby Voltage(PSU EAX62865401)
Ok so I don't get much on that DRV_ON pin. In stby I have nothing (5mV). When I press power on it only jumps up to 39mV. So main board must not be sending the drive signal. I did test backlights with a tester and I can get them to light up. What's crazy is I tried the jump method with resistor and main board unplugged and I can't them to light. They light with a led tester but not when stby pin is jumped to Drv_on pin. Unless I'm using wrong value resistor. I read 2 different values. Someone said 200 ohm to 500...Last edited by GMAN6325; 03-10-2023, 05:38 PM.Leave a comment:
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Re: LG TV 49LW5700 does not power no Standby Voltage(PSU EAX62865401)
I will check this when I get off this afternoon. I guess I need to check the backlights first with backlight tester to see if they even come on. I forgot to do this. I will let you know what I find. Im hoping it is the backlights and not the mainboard. Thanks for the reply.Last edited by GMAN6325; 03-10-2023, 09:06 AM.Leave a comment:
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Re: LG TV 49LW5700 does not power no Standby Voltage(PSU EAX62865401)
Well it might be the mainboard. I only have 36v on the LED+ Pins on p202. Nothing on the others. 36v is low. What should I have here for the LED's?? If I have nothing on the DRV ON pin, would it be something on the main board?Leave a comment:
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Re: LG TV 49LW5700 does not power no Standby Voltage(PSU EAX62865401)
Ok so it looks like my board is ok. Looks like it's gonna be the backlights. Will check for correct voltages first going to backlights.Last edited by GMAN6325; 03-09-2023, 07:07 AM.Leave a comment:
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Re: LG TV 49LW5700 does not power no Standby Voltage(PSU EAX62865401)
Thanks. I'm trying to figure out why the relay isn't getting voltage to kick on. I'm not getting my 3.5v stby so I have to figure this out first. It's just alot easier with the schematic. Thanks againLeave a comment:
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Re: LG TV 49LW5700 does not power no Standby Voltage(PSU EAX62865401)
Does anyone happen to have the schematic for this power supply board? It's an EAX62865401. ThanksLeave a comment:
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Re: LG 42LW4500 no power
Does anyone happen to have the schematic for this power supply in the thread.
It's an EAX62865401. ThanksLeave a comment:
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Re: New Members - please post your introductions here
Hello, I am from Louisiana and work on electronics as a hobby. Forgot alot of information from electronics school so refreshing my memory on some things. Found this site while searching for a power boarf schematic.Love it so far.Leave a comment:
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