Question about Samsung LN40A650A LCD TV

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HI I have an samsung ln40a650a seires tv. my problem is that i get sound but no picture there is two horizontal sections and a vertical section.

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You have to do some troubleshooting to find out if it is the power supply, T-CON board, ribbon cable seating problem, bad LCD panel.

http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/

Inspect the power supply for any caps with bulging tops, reseat the ribbon cable between the panel and the T-CON board (delicate works!).

Read about T-CON/LCD panel troubleshooting:
T-CON/LCD PANEL troubleshooting: http://www.mediafire.com/?zzjygannjty

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: www.interliquidparts.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Posted on Sep 23, 2011

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Hi there,
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Posted on Jan 02, 2017

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1 Answer

Hi.. Mine is a sansui tv and I bought it 3 years back. Now it is showing a horizontal line on the screen. Sound is fine but I can't see the picture, I just see one white horizontal line on tv...


The problem is vertical failure. Vertical output section to your TV ahs the fault. You ahve to check the vertcial output circuit for any component failure or loose solderings.

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1 Answer

Horizontal line


hi,
ur tv has problem with vertical scanning section. may be dry soldering or vertical output ic faulty.
u can easily find out the vertical section on ur tv. for that u have to open ur tv. u can see a coil is fitted on the picture tube neck. there are four lines coming from the neck, of which two will go to horizontal scanning section and the remaining two will go to vertical section. follow the two thin wire normally in color green and yellow. it will go to a socket in the main board. trace the track from that socket in the main board . it will lead u to the vertical scanning section. check for any dry soldering in that section. mainly the soldering of vertical ic. if see or not re-solder the leads of the vertical ic . then check is the tv is ok or not. if complaint remains replace the vertical scanning out pout ic. it will be fitted on a aluminum heat sink in the vertical section. if u need more assistance feel free to contact through fixya.

regards
Ajin

ajin_g_46.gif

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1 Answer

No picture. Just a thin horizontal band of light running through the center of TV.


HI,
Your tv has problem with its vertical scanning side. vertical scanning output ic (integrated circuit ) may have some problem ( faulty or dry soldering in its leads). You can easily find out the vertical ic on your tv. there will be four wire coming from the coil which is fitted on the picture tube neck, of which 2 will goto horizontal scanning section and the remaining two will go to vertical scanning section. just follow the two thin wire (normally in color green and yellow ). it will goto a socket on the main board. follow the track on the board. it will lead u to vertical scanning section. check for any dry soldering, if not , replace the ic.
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1 Answer

Toshiba Model 53HX71: Bottom half of screen and sound is fine; top half of screen has collapsed to a horizontal line in the middle of the screen. Repairman I spoke to briefly said it probably won't be...


Hello
Your TV has vertcal scanning problem. All picture tube based TVs have, both vertical and horizontal scan to spread the picture to entire screen. When vertical scan section meets with a fault, the picture will collapse horizontally and fi horizontal scan section has a troubl, picture will collapse vertically. Your TV s fault , we technically say, to be vertical foldover. This is due to the vertical output section, a circuit part, inside the circuit board of your TV.
To rectify this fault you must open your TV. Unplugh it from the power socket, and open it. Locate the vertical output section, which is easy to do. Look at the deflection yoke, the coil fitted on the neck of the picture tube, and you will see four wires from it going to the main circuit board. Out of which, two will be thick, normally red and blue in colour, connected to the opposite direction on the deflection yoke, and the other two will be thin. follow the two thin wires, said later, and you will reach to a plug in point on the printed circuit board.
Before doing anything, just look at the soldering of that section carefully for any loose soldering, or bad soldering. Usually, the components in the vertical output section will get heated during working, and ahve a cahnce to get loose contacted soldering joints. Just resolder all the suspected points by applying a little more solder, and see the effect. If thi doesn't help, check the IC used in that section for trouble. Some capacitors will be there in this section, will get dried as aging, replace them first, as they are ver few in numbers, When replacing capacitors, note their polarity, as electrolytic capacitors have both positive and negative terminals like torch cells. Before replacing the vertical IC, replace all the capacitors, especially, two or three large capacitors on that section. Just do these and if you want any more assistance feel free to contact me through Fixya. OK

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1 Answer

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this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! 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