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Posted on Jan 12, 2009


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1 Answer

My TV turns it self off after a few hour s of viewing


Hi.

The most common problem that causes shut down after few hours is overheating. Overheating however does not necessarily occurr because a faun is broken or because a thermistor is defective. A devective IC may fail and overheat on its own. The fault won't be even called overheating in some case.

The TV must be taken apart and tested by a technician.

Common faults to be tested are:

Fans and tehrmistors.
Convergence ICs.
Ballast.
PSU.
There are also a couple of test point on main controller board to be tested.

Regards.

Ginko.

Nov 09, 2010 | Sony Grand WEGA KF50WE610 50" Rear...

1 Answer

Dlp light bulb. Is there any way to test it?


Unfortunatly there is no way to test the Lamp of a DLP. This lamp requires 13,000 Volts to get it going, so there is no safe way to test, even if you had a tester.
Sorry I don't have a better answer to your issue.
Thanks

Oct 30, 2009 | Projection Televisions

1 Answer

How do i test the capacitors that are known to fail cp150 and the flyback transformer


You need to get the LCR meter such as one made by SENCORE, you can test for leakage, value, and ERS, and ringing test for the flyback transformer. I use SENCORE LC-75

Oct 29, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

2 Answers

Sony KP-65WS510 Convergence Problem


I tested all six pico fuses (3.5 A) and all tested fine on the continuity test. Is there something else I could check?

Dec 05, 2008 | Sony Grand WEGA KDP-65WS550 65" Rear...

1 Answer

What should the color setting be for my panasonic TV be?


Normaly the factory defaults should be correct if the set is working properly. Most likely, you may be able to improve a little on it by manualy changing some of the settings. As the set ages and is used, some of the components and the display may change characteristics.

You should use the proper test patterns to adjust the set.

Properly adjusting a TV set can be fairly involved, and is beyond the scope of an acceptable size email.

To have high quality test patterns, it is possible to buy DVD disks with test patterns on them for all the standard type scanning and resolutions for your TV set.

FAQ Site For Users About How To Adjust TV Sets:
http://myweb.accessus.net/~090/how2adj.html

Adjusting TV's With Test Patterns:
http://www.techlore.com/article/10095/How-to-Adjust-Your-Picture-Using-Video-Test-Patterns/

Video Essentials Test Patterns:
http://www.cinedrome.ch/hometheater/testpatterns/



Jerry G.



Jul 26, 2008 | Panasonic Projection Televisions

1 Answer

HD52W140 will not power on


Hello rsherrett1,

Ok first of all the only way the trippler could have caused this was if it shorted, and you would have known if that happened, because of the fire that would have occurred. So let's go back to square one. did you check the primary power supply in the back of the chassis? check it first for a blown fuse. I you can not find that then disconnect the power connection to the high voltage board and secondary power supply (switching power supply) and see if you can get the supply rail to the secondary board up (you will need a schematic to see the voltage values that should be there. Now if that fails to produce results you will have to assume that the secondary power supply is the culprit (it usually is). The funny part about this is the one component no one ever tells you to test is the one you should test all of the time and that is the IHVT (Integrated High Voltage Transformer) some folks refer to it as the "flyback" transformer. Now one of the biggest problems happens at this point there are three tests that you have to run the equipment needed is a s follows:

1) an oscilloscope

2) Universal Signal Analyzer/Generator with Ring Test ports

3) A capacitance meter or a LCR 103 (I prefer the LCR103)

4) an ohmmeter

Now here is what you need to do to test the IHVT

1) Remove the IHVT from the circuit board (desolder it)

2) Remove the HV cable clamp (holding the HV cable to the base of the IHVT)

3) (Test 1) Perform a resistance test between the posts of the IHVT looking at the schematic to see which posts are wired to each other. (now this test is only good for pointing out open coil windings not shorted coil windings) if this test passes (no opens) go to test 2

4) (Test 2) perform a ring test of the IHVT. Now this is why you need the Signal Generator with ring test ports. Connect the cable from the ring test ports to the primary side of the transformer, see the schematic to determine the primary os the transformer (the side connected to (actually between) the Horizontal Output transistor and the power supply. turn the ring test actuator fully counterclockwise, turn the test selector to ring test and slowly turn the ring test actuator clockwise until the screen reads greater then 10 rings, if ten rings can not be achieved then the IHVT has a short in it and should be considered as bad and in need of replacement. if this test passes go to test 3

5) (Test 3) The last test is the capacitance test. This test is a test of the internal capacitance of the IHVT. This is measured from the HV anode of the transformer to the ground post of the transformer. connect the negative end of the capacitance meter to the ground post of the transformer and the connect the positive end of the capacitance meter to the anode of the IHVT (this is the end that the cable was removed from, You will have to use a probe with a wire attachment to it to make contact with the anode connection in the IHVT. Once that is done the capacitance meter should read around 2.7nf or above. A reading of .3nf means the capacitor is open. Note: However certain flybacks may have the value of 4.5nf, 6nf and 7.2nf and sometimes the internal capacitor pin is connected to circuits (feedback) instead of ground, so be aware of this when testing. If this test passes then the problem is not the IHVT.

However if any of these test fail then the IHVT is to be considered as bad.

Now if the IHVT is good, then you will have to test the following components and their respective circuits:

The Horizontal Output Transistor, The Switching power supply MOSFET, The switching power supply transformer (perform ring test just like the IHVT), and pay special attention to the capacitor on the 6 volt rail (This capacitor is known to go bad often) as seen on the circuit board, The schematic will have all of the part location numbers as seen on the board.

This is a logical start as opposed to the shotgun approach a lot of forums seem to lead to. Let me know if this helps you.

Thank you,

Shuttle83

Jul 24, 2008 | RCA HD52W140 52" Rear Projection...

3 Answers

MY TV STOP AFTER BEGINING


i need m# if you don,t have eny power noled in front of tv a green lite ck out fuse if that good. ck hozoutput it by the flyback most of time if the hozout is bad you should replace flyback the part#
is on the side a tag.the hozoutput the # you can se it. if you have a onm metter you can ck the hozoutput in dioe mod.
i till you this you can call me if yon need to 518-798-7560 ask for robert i see what i can help you?

Apr 22, 2008 | RCA P52937 52" Rear Projection Television

2 Answers

Only Blue Screen


1. Suspect the Signal PCB part # 930B923002

Aug 20, 2007 | Mitsubishi WD-52525 52" Rear Projection...

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