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Bush lcd40fhda8 black screen sound ok

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6ya6ya
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Posted on Jan 02, 2017

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caroldon
  • 17130 Answers

SOURCE: bush lcd30yv005 picture

This is a common fault solution which can be checked and corrected by you assuming that there is no component failure. There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

Check for tips to look into the SMPS unit with some of my tips:

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

Thank you for using Fixya.


Posted on Aug 16, 2011

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SOURCE: What is the sky remote code for the bush lcd40fhda8

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Posted on Mar 24, 2012

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Flat screen has gone black but sound is fine


Suggest that you borrow a monitor from someone and try it on your system. If it works , you may have a defective backlight on your monitor , which means that you may want to replace the monitor. If the replacement monitor also is black , you probably have a video output problem , which would require repair of your computer.

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Image of the suspected components attached.
5_9_2012_11_47_28_am.jpg

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Is the sound a high pitched whine? or an arching noise? since half the screen is black I would tend to believe it is a deflection problem. Which is the Horizontal section were having problems you would experience this. Ok first get a schematic for this television. Either contact the manufacture or get one from www.servicemanuals.com Open the set up. Determine where the sound is coming from I guess would be the switching transformer or the IHVT (Integrated High Voltage Transformer) Then if you have one get hold of your multimeter set to dc volts and begin to measure the power supply voltages leading to the Horizontal section. Your problem will be in these sections.

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