Question about Toshiba TP61G60 61" Rear Projection Television

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Toshiba vertical collapse t.v. picture tube type A68LUW696X01

Hi,
this t.v. had vertical collapse and returned to normal after turning t.v. off for a few weeks then reverted to v. collapse permanently. Should I attempt to resolder the verticle board joints and if so how do I identify this part inside the t.v.?
Any other suggestions? thanks,
the t.v is 6 yrs old (03-23-02) a 27 inch flat tube t.v. model #27AF42 chassis # TAC 202.

thanks,
Mario

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Look for the PIP PCB problem..

`jack

Posted on May 18, 2008

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Hello Podman6,

Does the fault come on and off when you tap the case/cabinet of the TV? If so, then this is a dry joint/cold solder somewhere on the mainboard.
If you are are not qualified, do not take the cover off.
Look for a "largish" aluminium heatsink, located probably near the middle of the PCB. (It may be on the right hand side.)
With the cover off & an image showing on the TV, tap the heatsink with the "handle" of a screwdriver. Search for the most sensitive heatsink. Disconnect the power look closely at the other side of the most sensitive heatsink & you will probably find a "dry jointed" I.C.

If your set has an IC.501, look for a small capacitor near this IC./it will be 1 uf/50v or 2.2 uf/50v. You can make out which are faulty, because their caps will be swollen on top. Here's a sample pic (not same model):
toshiba vertical collapse t.v. picture tube type A - 1e47b76.jpg
Check the specifications of the faulty capacitors, and get the replacements from your local electronics shop. If you are comfortable with this, you can use a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors. Once that is done, solder in the new capacitors carefully. If are unsure how to do this, try to get a friend who knows how to do this kinda stuff do it for you, or get a qualified technician. Warning: If you do not have a background in electronics repair, or are inexperienced, get a qualified technician to do it for you.

REMEMBER there are very dangerous voltages inside a TV that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT THE POWER BEFORE YOU DO ANYTHING.


If you are unsure, PLEASE CALL A QUALIFIED REPAIRMAN.

Hope that helps, and thank you for using FixYa!

IrishDruid

Posted on May 17, 2008

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Does the problem occur on other channels..?

Posted on May 17, 2008

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Resoldering the vert ic chip could fix it part starts with la or tda the part is thin 12 or 14 pin . sometimes other numbers but this is most common. it is not the flat.
ic on board it will be up of board slightly. i hope i explained it correctly.


thanks DOCTOR VIDEO


Posted on May 17, 2008

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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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Your TV is in what is called "vertical collapse". About 70-80% of the time it is due simply to bad solder joints on the vertical output IC. You can verify this by tapping on the side or top of the TV, the picture may jump back into position. If it comes back it's as simple as re-soldering the vertical IC. If not, the vertical output IC may be shot or it may be missing one of it's supply voltages.
If the picture has been shrinking or had lines at the top that means there are some capacitors in the vertical circuit that were drying out. If it happened all of a sudden I'd bank on it being just bad solder.
Don't run it like that with that bright line for too long or it will burn in on the picture tube. Then if you do get it fixed you will see that line there all the time!

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It could be the vertical output IC, but there may be other possible causes which include:

- bad solder contacts on deflection yoke connectors or dirty connector contacts (on the circuit board and / or on the picture tube neck)

- bad solder contacts on the vertical output IC or associated components (check for little cracks in the solder around the pins, these are so called "cold" or bad / broken contacts)

- power loss to the vertical output IC - check for any burned resistors or other components around that IC, assuming you know which one it is - see which ICs are connected to the wires going to the deflection yokes (coils) on the picture tube neck and check them well.

You need to resolder any bad contacts, clean any dirty pins on the connectors and replace any burnt out components (assuming you can still determine the type or value of the component).

Since you mentioned the problem occurs once in a while, this means that the IC probably fails when it warms up, which can often happen if there are loose connections or bad solder contacts.

Anyway, it could turn out to be a faulty IC, i just suggested a few other things that can be fixed quite easily, and possibly without the need to replace any of the components.

regards

3rq8 (Triarcuate)

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