Question about Mitsubishi VS-5043 50" Rear Projection Television

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Upon inspection of the mentioned areas I discovered a burned spot on the board at IC9A1 near a 2 watt 2.7 ohm resistor R508 and QA543 which all have overheated solder connections. IC9A1 and QA543 both have bad connections to the PCB cicuitry. There appears to be another resistor mounted too close to the fuse in that area and looks to have touched the fuse terminal. There is a carbon deposit on the lead, such as an arc. Your input has been very helpful in narrowing down the search and I thouht you might like the findings. One note: I could not locate R510. The circuit may have been modified slightly

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Not uncommon in a mits and more likely due to some caps that have exceeded their ESR. That still doesn't make this unit unrepairable, mits were built to last. Find a good reliable shop and take it in... You can use the NESDA web site to locate one unless you have that worked out.
Good Luck!
Bill

Posted on Sep 10, 2008

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Some simple advice---if resistors are smoking one of the chips is shorted----The set has two voltages that go to them--one a positive voltage and one a negative voltage.

If either chip is shorted you can replace the resistors all year and not get anything. The resistors are protection in case one or both chips short----

Remove all old heat grease and install two new chips and replace the resistors at the same time.

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Aug 25, 2011 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

I need to know the value of the Resistor "R1" in


Let us use a bit of logic to resolve this... I have an Axiom but it would be a lot of screws to take out to get to the part... so let us think about this. The resistor value starts with a "1" and we know it is 5% tolerance (gold). we know the resistor burnt up with likely 5 volts on it... Value could be 1000 ohms, however the voltages present (12 volts max) would NOT have burned up a resistor of 1000 ohms. The USB area is mostly 5 volts and across 100 ohms is only a quarter watt... not enough to really burn up a resistor... First thing is to MEASURE that the resistor s open... in spite of being burned, it MAY still be OK... these resistors now usually either open or remain close to their value. The resistor ALSO may be a fusible resistor intended to act as a fuse... Is the resistor open or not? is it near a resistance with a "1" as the first digit? If it is not open I suspect it is not all of the problem. In that case, look for a burned circuit trace on the board. If it is open, then MEASURE the voltage across the resistor with the power applied. If you find 5 volts, then it MIGHT be a 10 ohm used to limit the USB current to 500ma. Get back to me with your findings... I have unraveled many of these things...

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1 Answer

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You have several bad grounds on the convergence board. Boy! I mean several and to numerous to mention. If you know which is the convergence board, pull this out of the TV. This will be difficult and requires your best patience. The convergence IC is located on a large heat sink. The IC will be an STK 393-110. Start by re soldering the pins on this IC. Check all resistors that are 3.9 ohms at 2 watts for values with a DMM. I do not believe these will be need replacing, check to be sure any way. You may have to re solder these as well. You will note you will need to re solder the jumper jacks (these connect to boards on either side of the one you are working on. Locations of these jumper jacks are PM, VU, and PF. Now if you can, inspect the rest of the board, and look very close for solder breaks on diodes, transistors, capacitors, resistors and transformers. You must really look close to find these. Don't expect to do this in one day. Spend about thirty minutes a day for week, for inspection and corrections. Thanks for (yawning!) asking me and show all hands of support! G'dnite.

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1 Answer

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Apr 23, 2011 | Akai PT5492S 54" Rear Projection...

1 Answer

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1 Answer

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1 Answer

Is there a way that you can tell if your resistors are blown


Hi


Thanks for using FixYa. By looking at the resistors you can see if they are burned or brown color. Only the resistors with small value blow(getting open) like 1 ohm 1/4 watt or 1 ohm 1/2 watt or 10 ohm 1/2 , 1/4 watt some times the bigger one like 100 ohms, the bigger than 100 ohm just changing the value and make problem.


Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks
Rylee

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1 Answer

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You can do the repair yourself using the following instructions.



http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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