Question about LG Televison & Video
I have a LG 42PG25 plasma TV manufactured in May 2008. The model number is 42PG60UA. It has a LGE PSU EAY39333001 PSPU-J704A Rev 1.0 power supply unit. It has a EAX42297601 Rev J YSUS board, a EAX41603501 Rev J ZSUS board and a EAX41833301 Rev C CTRL control board. A few weeks ago, the TV would power up but with a blank screen. The solid red standby light in front works. When I press the front power button, I hear a solid clunk sound and the standby light changes colour from red to blue and starts flashing blue. At about the 5th blue flash approximately 5 seconds in I hear a buzzing sound in the back. At about 18-19 flashes later the light stays solid blue with no screen or sound. When I turn the power button off, it takes about 11-12 second before the solid red light turns off complete with a clunk sound. I watched a lot of LG TV repair videos that led me to believe my PSU was damaged. I ripped apart the back panel and found Capacitor C235 blown from the PSU board. I replaced it and nothing changed. I had spare 10V 3300uf capacitors and replaced C232, C233 and C234 as well and nothing changed. I checked fuse F101 and F801 on the PSU and both were good. I checked fuse FL201 on the YSUS and it was good. I checked the some voltages on the P811/P64 testing terminal right beside where the power goes from the PSU to the YSUS - all voltages were in spec for all the testing terminals VS, VS, NC, GND, GND, VA, VA, GND, M5V, M5V. I tried isolating the buzzing sound from the YSUS and it is sounds like it is coming from a 4 pack of glued together red capacitors C701, C702, C919 and C920 on the YSUS board, or possibly the two copper coil things I think called L901 and L701. I am not sure if it matters, but when I turn on the TV, control board light D103 is this a diagnostics light? comes on but then immediately goes to D104. Light D104 stays lit up until about 60 seconds when I hear a change in the buzzing frequency a bit lower and then D103 comes back on and stays lit. I also see a light on the video board it has a sticker that stays 42PG60UA, light LD803 that stays lit up the whole time with TV tries to power on. What should I try next?
Posted by Anonymous on
It is 19 years old, and I would say beyond economical repair. You will be chasing blown components that were damaged when the power surge or brownout occurred. It is only a 42" set and it is plasma. Technology has moved on to 4K Ultra HD, LED and smart hubs. Treat yourself, it's Christmas :>)
Posted on Dec 19, 2017
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Posted on Jan 02, 2017
IF you would like help diagnosing your set. Go to the enclosed link. They have the service manual for your set and offer unlimited chat support for only 29.99. Just click on your sets manufacturer and you will see your model. Then click on the contact us link and provide your email address and they will email your manual and instructions on how to obtain your support. I am one of their techs. This manual contains step by step procedure for troubleshooting Your RCA DLP Light Engine
Posted on Jan 15, 2008
SOURCE: 55hds69 hitachi plasma
I have had some issues with high ESR readings in the capacitors in the scaler circuits in those units. Do you have an ESR meter to check the caps in circuit?
Posted on May 16, 2008
SOURCE: Samsung LN-T2632H won't turn on.
Follow these steps to figure out what problem is.
When you turn on TV, look at the back and see if the back light on. If it is on, the power supply and inverter work fine. The suspection now is main board and T-con board (the small board on the middle-top of the panel)
To find the problem from the main board or not. Look at the power supply and measure Vs on - turn on the TV, this approx 5 vlt DC needs constant once you turn on the TV. If it is drop or unstable - main board problem - replace it.
If Vs on is good - disconnect the T-con cable from the power sup. If power sup stop clicking - T-con need replacing. Hope it help.
Posted on Aug 13, 2009
Check to see if you get Va and Vs voltages from the power supply. There should be some wires running to the y-sus. A couple of those wires will be labeled va and vs. Are they present? There will be a sticker stuck to the panel somewhere telling you what they should be.
Posted on Mar 26, 2010
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