Question about LG Projection Televisions
My LG 32LT75 lcd tv sometimes shows a black screen when switching it on or changing channels but you can still here the sound. To get the picture on we have to turn the set off and then turn it back on again. Can anyone help as it's getting worse.
MMMM Hard call here. The fact that it does try to come on blue maybe an indication that the power supply regulator circuit is good. It could also be a shorted blue tube and when it comes on its overloading the screen drive and the set goes into overload protection shutdown. The real way to see Would be to pull off the blue crt socket as well as the Hi Voltage lead on the crt and see if the set comes on without blue. If it does Your gonna need a pict tube. If it dosent then troubleshooting along the switched power supplys would be neccassary.. BUT I advise you THAT IF YOU HAVE NO EXPERIENCE TROUBLESHOOTING TV SETS PLEASE SEEK A PRO TO ASSIST YOU AS THERES VERY HIGH VOLTAGE INSIDE THESE SETS EVEN IF THEY ARE UNPLUGGED. GOOD LUCK
Posted on Jun 29, 2006
SOURCE: Red screen on LG 44-inch DLP
Rear projection TVs require a light bulb (found on the right hand side of TV behind a small screw fixed panel) and this, like any bulb needs replacing from time to time. You need to get it changed by a repair guy or get a bulb yourself and do it. They're quite expensive though, £200 last I heard I think.
Posted on Oct 06, 2008
Mine did the same thing this week. It was caused by the white ribbon cord. The cord got bent over and over as you flip the tv open and broke the wires inside. The cord is soldered directly to the circuit boards on both ends of the unit. I do not think an average joe can fix it because it requires soldering a new cord to the circuit boards on both ends. I am going to buy a new unit for around 200$ and install it.
Posted on Jun 23, 2009
I have been repairing Plasma Tvs for some 3 years now and have found most of the problems caused are by Capacitors.Once again Soniq are no different to the others.The fault is on the main Video Control Pcb.Replace Capacitor C529 which is a 470mfd25v.This cap is mounted next to an inductor coil at the top middle of the pcb.This Pcb is the one which has the tuner and all inputs on it.
Good Luck AND PASS THE WORD AROUND. LET US KEEP THE SERVICE INDUSTRY GOING.
VIEWCLEAR VISION PL BRISBANE AUSTRALIA.
Posted on Apr 08, 2010
Most likely your problem is on the DMD Assy Board P/N BP96-00249A . More presicely there is a few bad electronic components on that board that are bad. That board can be repaired by replacing the bad components (and the other few compoonents that are probly going bad and will soon cause your tv to lockup and lose remote and button functions when it fails so you will need to unplug it to get it on again).
Or the DMD board can be replaced .But it is not a cheap board.
For removal and Installation of the DMD board I would reccomend a tv service person because it is in the heart of the television and there are some adjustements to be made when the new board is installed.
To get the new board you could probably find it by just gooogling the part number.
Component level repair would require some experience in desoldering and soldering SMT,SMD , and or surface mount components.The actual components are about $15.00 total so just repairing your board should cost about $125.00 by a qualified servicer (if you were to remove and install it yourself). This DMD board is used in many models and can a few common problems.
HLM437W HLM4365W HLM5065W HLM507W HLM617W HLN437W HLN4365W HLN467W HLN507W HLN50665W HLN567W HLN617W ( L2 and L5 chassis )
-Intermittant picture freezing with a negative looking B/W frozen picture.
-Intermittant loss of pic with/without shutdown,abnormal color wheel noise if attempted to start after shutdown.
-lockup of tv control functions . Remote and front keypad do nothing , TV must be unplugged to reset .
-horizantal tearing, distortion , flippnig , solarization , red picture, leading to blank screen and lockup.(tv menu would be affected by all picture defects).
Hope this helps someone..
Posted on Jul 21, 2010
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