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My samsung plazma tv has sound but. No picture what is the problem

Posted by benlohrer on

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Jerry Umali

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Hello Sir, Hi, its the inverter board that powers the back light. this needs replacement. the board can be purchase online. try www.usefulparts.com and find your model TV under manufacturer. If the board is available, have it installed by a technician.

Posted on Feb 22, 2011

  • Dan Davenport Mar 03, 2011

    If it is a plasma TV it won't have a back light or an inverter, that is only on an LCD TV, it is more likely the power supply or the YSUS board. Plasma's are difficult. High voltages and currents and one board blows and takes others down with it. I am quite confident with electronic stuff but I have been beaten by a plasma and won't fix them now (Till I get some training!) BE warned!

  • Todd Hill
    Todd Hill Jul 09, 2011

    plasmas do not have an inverter pcb.. really? or backlight ck voltages out of pwr supply ve,vs,va vces, rly on high ms on high would look at startup v-sus signal ramp up ramp down

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Sean Michael

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As with other post where the detail of the make,model,series,ect. are not given this is a short generic description for Plasma screens. First of all as the plasmas tend to be relegated to the large screen environment. LCD's have only recently begun (era 2009-2011 ) to be manufactured in quantities with sizes larger than the 32"-42' sizes.
The Plasma and LCD apparatus are two very different pieces of equipment which accomplish the same task. The myths and misinformation abound for the operational phases of both . ie;
Dark picture with sound on a LCD would usually represent an inverter or back light failure.
Dark picture with sound on a Plasma ( which do not utilize the inverter / back light setup ) could represent a partial failure of the main power supply, an out of range video signal, thermal shut down of one or more power/regulators in section/group boards after the main power section/group board. Such as leaking/blown capacitors ( yes remnants of the capacitor plague are still with us) on the Video Group output section. In the afore mentioned scenario , the video would fail but the sound which is a separate circuit, group, and power rail would continue uninterrupted.
Plasmas like LCD are not mythical, rocket science, or magic. They just require a knowledge which is not familiar. A schematic or block diagram is a good start. A thorough knowledge signal circuitry and power circuitry help.
Where as I am awaiting approval under "fair use" to use a plasma schematic particular to a known brand, I cannot upload the item at present. I am currently seeking a good generic diagram/roadmap to illustrate the general layout in hopes making this a little easier to visualize.

Doc Michael

Posted on Mar 07, 2011

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