I have panasonic 50G10B if you plug the mains and switch it on there is no power or indicator light when I open the tv to check for voltages only 5v stb from the power supply to the main board ,the signal from the main board to switch the psu is not coming I suspected the main board but I want to know if anybody has come across this fault, I cant find some of the board here to buy I want to try to fix the faulty one
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Re: panasonic 50G10B
How much electronics repair experience do you have? No standby light suggests a few possibilities:
- 5V standby not reaching main board - broken wire/loose connector/cold solder/etc.
- Panel/control MCU not working
- Main board low voltage rail missing (such as 3.3V)
- Software problem with main board/lock-up due to bad software (rare - would normally get standby light)
- Broken LED light or connection in between
You can get a full schematic of the A board (main video board) in the service manual:
The power LED is controlled by IC1100, the SYSTEM MPU (GenX8) on the A board.
Check the STB3.3V to it is present.
You can check across the small ceramic capacitors near the IC (pins 63 and 65 for e.x.)
Or you can check at pin connector A17 "FOR FACTORY USE" (normally not connected) pin #2 has 3.3V standby, and pin #1 has 5V standby. If you have 5V & 3.3V it looks like it could be a complex repair. If you have 5V & no 3.3V you're lucky, may just be a dud regulator or a shorted ceramic cap. If you have no 5V or 3.3V check all connections, wires, fuses, and solder joints along that tract.
All readings are taken with black probe on chassis, TV powered ON.Last edited by tom66; 06-01-2014, 06:10 PM.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. -
Re: panasonic 50G10B
thanks, I will follows the tips and study the schematic and report back thankx againComment
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Re: panasonic 50G10B
Hi Tom,
Good I found this forum. Hope I can resolve my in Panasonic Plasma T.V (TH-42p..)
On my Plasma T.V screen all of the sudden I can see Red or green pixels along with the image. there is no specific time or frequency for these pixels to appear. Some times it comes continuously all over the screen (along with the picture in the background) for about 30 sec and suddenly gets a clear picture and the same continues. But some times the picture is clear without any pixel issue for several hours.
Is that a voltage issue or Aged screen? Your inputs please.Comment
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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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Hi everyone,
Iām looking for help with a persistent issue on an LG TV model 55NANO77SRA, which uses the main board EBU66792103 (also used in LG UQ80 and NANO75/NANO80 series).
š§© Problem Summary:- The TV keeps scrolling through the menu or selecting items by itself.
- I removed the physical button board (the entire panel with power and volume buttons) and also disconnected the flat cable (CN202) from the main board.
- The remote control is not in use (batteries removed), and the TV still shows the same behavior.
- I
07-28-2025, 08:34 AM -
ONN 100012588
Issue: No Power, Then Rebooting After Main Board Change
Short answer: replace main board and power board
Technical answer: replace main board and Q306 & Q307 on power board.
Long answer:
TV wouldn't turn on. Power switch was fine which means the main board isn't processing the power on signal. Replaced main board. TV turns on now but randomly reboots. Bad main board? EEPROM? Tried to pull main board and got a shock touching the corner of the board. That's weird. C334 (450V 10uf) capacitor is still holding a high charge.... -
Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
I suppose the real question is whether the existing pinouts from ether a 17IPS71 psu are cross compatible with a 17IPS12 psu? If they are then the exchange of the main boards should have no issues providing the screen is compatible with both main boards. Obviously you can change the screen configurations easily enough (providing you have the correct files) for the main board. Why may you ask would I do this? Well a lot of the smart features are no longer working on a Hitachi 48HBT62U main board I wish to give it a new lease of life!
Obviously the same LVDS connector for the screen connection... -
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached....
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