hi all I have just bought a whalfdale lcd sorry I do not know model number but my problem is when turned on the screen flashs and the set goes into stand by It does this everytime I have had the back off and no blown caps I have unplugged the invertor board and the set will power up and apart from the lack of light it does not turn off as soon as the invertor board is connected it shuts off could someone tell me if it is the power board or invertor board it is a uk model 240 volts thanks
-
-
Re: whalfdale lcd help
can you upload good clear pictures of the boards in your tv so we can see what were dealing with what the part numbers from the power supply board. -
Re: whalfdale lcd help
I will upload some tomorrow the power board is a 17pw20 v2 and inverto board is 4h.v1838.461/b it will power up until I plug in the back lights once I plug just on in it goes back into stand byComment
-
Re: whalfdale lcd help
have you tested the psu voltages? do they also drop out when the backlight fails?Comment
-
Re: whalfdale lcd help
The 17PW20 has a few common problems that should be dealt with before looking any further, there is a cheap kit of parts available for this which might be the best option for sake of reliability. You may find this solves the problem.Comment
-
Re: whalfdale lcd help
all voltages are fine until I plug in the ccflComment
-
Re: whalfdale lcd help
Can you supply us with the requested picturesPlease 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
-
Re: whalfdale lcd help
ughh,argos badge
,last one of these i did with the same symptoms was a ccfl with burnt end arcing against the supply wire,thus causing 2 secs to black issue,and shutting down the inverterfixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
----------------------------------------------
please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
-
Re: whalfdale lcd help
pictures of power and invertor
Attached FilesComment
-
-
Re: whalfdale lcd help
replaced most caps and I have notices a humming sound coming from somewhere but cant seem to pinpoint itComment
-
Re: whalfdale lcd help
now checked all ccfl with a battery and they apper fineComment
-
Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Re: whalfdale lcd help
got it fixed now thanks for all the help you gave lolComment
-
Re: whalfdale lcd help
care to inform us what fixed the tv?Comment
-
Re: whalfdale lcd help
yes a new power board it saved all the messing around and only £15 off ebayComment
-
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... -
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.... -
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 There,
This TV was auto switching off after few seconds with some vertical lines on the screen, so got a new TCON board and replaced it.
After replacing the TCON board it was working fine and i set it up with everything, used for few hours, then had the bright idea to update the software on it. During the update process, TV switched off and now no audio or video. No relay switch sound.
More Details
TV Model - LG OLED77G1PUA
Got the same exact TCON board from TVPartsToday and replaced it. But didnt transfer the EPPROM data (didnt... -
Hey guys great forum glad to have found it. I bought a Sony XBR 65X900C cheaply because it didn't work. No signs of life at all not even a light/led. All I hear is a brief high voltage sound when I throw the power to it.
Didn't see any obvious signs of damage so right away started checking voltages. This is what I see:
Power Board Connector that goes to Main board
CN6401
Pin 01 NC
Pin 02 NC
Pin 03 "BL_ON": 0V
Pin 04 "N/C"
Pin 05 "STBY 3.3V": 3.5V
Pin 06 "GND": N/C
Pin 07 "AC_OFF"...
Comment