Question about Toshiba TP50H95 50" Rear Projection Television

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Toshiba TP50H95 Convergency problem.

30 mons ago, one of the color was blend (non-linear) across the screen. I got it repaired for $200. The repairman just told out the PCB from the back to shop. I was supriced the PCB looked pretty simple and no where near as complex as an PC Motherboard, just with many cables. Today, I notice the whole red color is shifting up (horizonalty/ & evenly across the screen). The chip is trying to compensate so the red will move up slowly to like 2 inches higher and then pop down back to where it should be. It will keep doing a for a short while..ASo far, once it warm up (a fews minutes), the TV image will stable. I am very handy in electronics and have built my own CB in the past. Is this something obvious I can take care the repair myself after I told out PCB from the TV. Changing, QFP, SIP,...,etc is not a problem. Appreciate your experience. Just want to hold this nice TV (98 vintage) for a few more years before switching to HDTV. It is good for the earth !

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Re: Toshiba TP50H95 Convergency problem.

Hi. The covergence Ics are mounted on large heat sinks they usually start with STR**** You will need to replace both & check resistors electrolytic capcitors & any circuit protecters on the same pcb as the chips.

Posted on Sep 02, 2007

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It sounds like intermittent loss of convergence and you should be able to cure that by taking a look at the convergence amps and locating one or more ring-cracked solder connections. Resoldering them should fix the problem. The amps are two STK392-110 Sanyo Ic's mounted to an aluminum heat sink. Remove that board and visually inspect where they solder to the foil side of the board.
Good Luck!
PS I'll send the manual via Pando to your address. You'll need Pando to download it and a PDF reader to view it. Both are free downloads if you don't already have them....

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