Got this 50 inch LG plasma TV in, When power lead is connected the tv goes into standby with red LED, When i turn the set on the LED changes to blue and it clicks but i get no display or light from the screen, Tested with a multi meter and im getting 0 volts on both Va and Vs.... Is this a common fault with this tv?
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Re: LG 50PS3000 No Voltage
Common fault on All Plasma sets!
Check for shorts on Vs lines to both Y-SUS and X-SUS.TELEFIX
How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
http://www.irf.com/technical-info/appnotes/an-1088.pdf
PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM! -
Re: LG 50PS3000 No Voltage
Here's a few pics of the power board, I'm not really sure where to check first, Could you suggest where to start..
https://lh5.googleusercontent.com/-b...225_113946.jpg
https://lh6.googleusercontent.com/-w...225_113936.jpg
https://lh4.googleusercontent.com/-5...225_113906.jpgComment
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Re: LG 50PS3000 No Voltage
Have you tried isolating the Y-sus and Z-sus? Shorted Z-sus is very common on these, usually the TV will buzz loudly when you try to turn it on followed by relays will clicking off.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50PS3000 No Voltage
Yeah Tom, I already tried disconnecting all boards from power board one at a time and always got the same thing accept for when I removed the main board I got nothing then.Comment
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Re: LG 50PS3000 No Voltage
If it still blows fuse when Y and Z boards are disconnected then fault is on PSU. It can be a bad diode, a shorted Fet, or a number of other things.Comment
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Re: LG 50PS3000 No Voltage
Its not blowing fuses, just no va or vs voltage when set is on, led change from red to blue as if tv is on,Comment
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Re: LG 50PS3000 No Voltage
Some PSU's will shut down VS and VA if there is no load on it. Are any other voltages different or present when tv is on compared to off?
You should be able to jumper 5v Stby to PS-on with a resistor to force PSU on to check other voltage readings. There may also be a VS on pin or the like to activate the VS and VA volts.
Cannot see pin legend on bottom right connector in your pics. Too fuzzy.Last edited by MagicSmoke; 02-25-2015, 06:43 PM.Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi Everyone, I am new to this forum. I have a Panasonic LED TV which doesnt turn on and is blinking 4 times repeatedly when I turn on the switch. The TV does not respond to the remote control so I had to turn on using the physical switch on the side of the TV. When I turn on the switch the 4 x blinking starts and repeat itself until I turn off the TV. There is a black screen. I turned off the light in the room to check the panel and I think there is no backlight as far as I can tell.
I have been inspecting and testing the capacitors and diodes in the power supply board to try to... -
I found two capacitors on the board and one of the leads on one capacitor had bad soldering joint and the other joint connections not much better and there were several soldering joints that way to much flux around the joint redid several of them
The capacitors were a non brand that I did not recognize they got replaced and now it does not oscillating between relay but what concerns me a little bit is when the voltage is a little bit low the output voltage is around 130 volts and then drops down to 115 volts this happens around 105 to 108 volts if remember correctly
Now... -
3+1 Voltage Regulator for IMVP-7/VR12 CPUs
Compliant with IMVP-7/VR12, the ISL95831 provides a complete solution for microprocessor and graphic processor
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Based on Intersil's Robust Ripple Regulator...11-05-2024, 03:24 PM -
Hi
Acer A515-43
LA-H801P
Fail: Does not charge battery, has low voltaje on connector.
Laptop didn't want to turn on, only charge led blinked.
I found PQB5 (mosfet high battery charger) in short, voltaje in +12.6V_BATT was 19 v ...
I changed it, changed PQB6 too and now battery charger voltage is 4.4V but battery is 3 cell, 11.25v, then is very low to charging.
Laptop turns on without battery and works fine, but with battery turns on and turns off inmediately, I suspect battery bad but I don't know...
Comment