Question about Toshiba 50H81 50" Rear Projection Television
While back I changed the caps on hyper board and replaced the convergence modules. I can hear the high voltage come up I even unplugged from wall no go. I do have service manual. got any real good suggestions where to look first. toshiba model 50h12
Thanks in advance for choosing Fixya for assistance.
Before I present my possible solutions to you, I may have to need
more additional details on your TV.
You need to check circuits such as Horizontal Deflection
have a check on the Flyback,
additional info on flyback:
Check the Horizontal Output Transistor . Either or both
Could be affecting, Supply out your Power Supply
Have the unit unplugged when doing a resistance check on the Board.
Bleed or have the main capacitor ( power supply ) with a 4.7K 5W
Although some components on the links above , may not be the
actual components, but the principle in troubleshooting is the
you may need at least 30 watts of Soldering Iron and a
good quality Soldering Lead to solder the cold solder joints on the
How to solder boards properly
How to test for Continuity
How to use a multimeter
You may need to post :
a ) Power supply output voltage ( B+ ), and other output voltages
( Main power supply )
When the unit is in standby,
When the unit is turned on
and when it is turning off by itself.
Insure that it is not above the service manual specs.
You might as well check on the protection Circuits
( Power supply area ), although some Circuits can cause
protection activation too.
Might as well post the part number of the main Regulator.
Posted on Jun 02, 2010
Whoa!, there, hi, don't be in a hurry to repair your TV, or you may damage the unit more plus you may get shocked. Before jumping in, try to look for things that are smelling like burned parts, loose wiring, physically check for capacitors with bulging tops, those are the thing we will look onto first. Well that the only thing you need to look for, beyond that you need a service man who knows your TV. Even if you have a manual , I don't see it as your guide to fixing the TV. You will eventually get bored and tired if you do not know what you are looking for.
But if you really want to do it, you need to properly make the power supply board operate normally, you need to check for bulging capacitors, open resistors, fuses and shorted power regulators, you need equipments, like a volt meter to check for the voltage outputs against the schematic diagram, and an optional Oscilloscope for viewing waves on the diagram.
If you have these equipments, check for the AC power if it is reaching the rectifiers, DC out on the filter capacitor, and various DCs for the entire power board output like 115 v for high voltage, 12v for audio if the audio is using IC amplifiers. Check the schematic diagram to verify voltages on various parts, If you found voltages that are off or no readings at all, then look now for individual parts that are either open like resistors, fuses or shorted like diodes and transistors, mind you that this takes a lot of concentration. There are of course, a method to troubleshoot a TV, that why you need a service man to do it. Keep me posted.
Posted on Jun 02, 2010
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Posted on Jan 02, 2017
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