Toshiba 56HM195 56" Projection HDTV Logo
Tommy Luckadoo Posted on Jun 07, 2007
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56HM195 Light Engine Troubleshooting

I have a barely used but out of warranty 56HM195. A minute or two after turning the set on, video on the left side of the screen begins to display a block pattern (it looks plaid, if you can imagine that). The dividing line is straight down the middle. After the TV cools down and I power it up again, the picture looks great for a minute or two, so I'm guessing it may be a thermal issue of some sort. It looks as if replacing the light engine is a simple process. However, before going to the expense of getting a new one, is there any troubleshooting to the module I can do? If not, do you know of any good rebuilders? Thanks.

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  • Tommy Luckadoo Jun 07, 2007

    Is there any troubleshooting I can do on the module? And is it indeed as easy to install as it appears in the service manual?

  • Tommy Luckadoo Jun 08, 2007

    premtech-

    Actually, it's just the opposite. The picture gets worse the longer it is on, until finally, as I witnessed last night, the entire left half of the screen goes completely dark.

    I know it's not like the good old days when a shot of tuner cleaner could work wonders on many problems; however, is there any component on the board I could troubleshoot before sending in the entire module?

    I appreciate all the good suggestions. If there's nothing else I can do, I'll send it on to TriState.

  • Tommy Luckadoo Jun 10, 2007

    Guys-
    Great suggestions and I truly appreciate the help. I'm used to jukes, radios, and pinballs, and have done very little with TVs in recent years.

    We have two suggestions: video board and optical engine. I have uploaded a picture of the screen after a couple of minutes of operation. Does this confirm anyone's suspicions? As I said, a few minutes later, the left side goes dark.

    Bill, I have a friend with a shop who can test the caps. That video board is pricey! I noticed in the service menu that the set has only 261 hours on it; the caps in my old radios lasted decades.

    With so few hours, any chance it's just a cold solder joint somewhere?

    bluenadas, I have a service manual but could find no reference to a screen generator. And yes, the menus are affected by this problem.

    techman, can TriState also rebuild the video board if that's the problem?

    Thanks again everyone.

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Most light engines have a internal screen generator that bypasses any video processing circuits to troubleshoot just such an issue. See if you can locate a service manual for this model and initiate such a test. If I can locate a manual I'll post the instructions.

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  • Posted on Jun 08, 2007
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Tomluck, Don't just replace the light engine, it's too expensive for one and the idea that the picture gets better as the set is on longer indcates to me that it's cap related... My first suspect would be the signal module Toshiba p/n# 23148444 because any grouping of those caps can cause picture distortions even like one you're describing.. Only way to test for that is using an ESR meter (equivelent series resistance) meter.. That way you could test the caps in-circuit and replace the ones that are running high... As a cap warms up it's ESR drops and the cap begins dissipating voltage at a correct rate. Thus, after your set has been on awhile the picture improves... You need to bite the bullet on this one and find a reputable shop. I think you'll find that they can repair this one at component level verses module level. As a footnote: Tri State does board level repairs & rebuilds - I'm not exactly sure they would take a light engine in for repair.. Only company I know does that is PTS Electronics. Good Luck Bill

  • Anonymous Jun 08, 2007

    Tomluck,
    I would still suspect the signal module first, not the LE... The only test I know you could do to that board, if you have the equipment, is test the smd capacitors. You would need an ESR meter - we use the CapAnalyser88 in the shop here and then it's just a matter of testing all the caps on that board.. When you find the culprits, and I'm pretty sure you will, the test will indicate one of two things (1) a high equivelent series resistance, or (2) and open condition in which nothing will happen on the meter.
    From what you said about it getting worse as the unit is on longer it's likely you'll find that a group of them are open..
    Even if you get and do all this these are smd caps. That means they are surface mounted to the board and if you were to attempt to remove and replace them yourself - (and most shops wouldn't) - you would need an smd removal station, a good cheap one costs about $1200 and up.. Most shops merely replace the board and send the old one in for core..
    I can't advise you any stronger than to say I would just bite the bullet on this one and take it to a reputable shop and have this done. You could easily get hundreds of dollars into this yourself and still end-up taking it to the shop, adding insult to injury.
    No pun intended..
    Good Luck
    Bill

  • Anonymous Jun 10, 2007

    I'd first suspect the signal module by what I see here. The caps are smd(surface mount) and as I mentioned in an earlier post you would need at a minimum an SMD removal station in your arsenal of equipment. Not really practical for most shops, time and material, just more cost effective to replace the board and send the old one in for core...
    It's not likely poor solder joints. Your symptoms would be intermittent not progressive.
    I'm not too sure Tri-State does these - but I could be mistaken. Their site lists about everything they work on or have in stock for modules.http://www.tristatemodule.com/
    I do know for a fact PTS Electronics rebuilds them but why go through shipping it out, waiting two-three weeks plus that expense. I'd bet you wouldn't be saving much more than $50 - $70 to just order a new one.
    But, here's one final idea - - call PTS and ask them what their bench test fee is for this particular board and that you want it verified as defective before you decide to repair or replace it. 800-844-7871 It will cut your wait time by more than half and give you all the critical information you need to make an informed decision...
    Good Luck
    Bill

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Very well could be the light engine my friend. Contact Tri state repairs. They rebuild and refurbish light engines for alot of maufacturers, even the Toshiba DLP sets, as that is what you have. Your problem certainly sounds like the light engine, but is hard to say without looking at the set. You can contact Tri state at: TOLL-FREE: 800.203.7484 LOCAL: 812.867.7583 EMAIL: [email protected] FAX: 812.867.7814 FAX: 812.867.7706 OPEN:MONDAY - FRIDAY HOURS:8:00AM - 4:30PM, CST Good Luck!

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  • Anonymous Jun 08, 2007

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  • Anonymous Jun 08, 2007

    premtech, look up Tristate on the web, they do light engines and have for some time.

  • Anonymous Jul 03, 2007

    A service manual is available here: http://www.servicemanuals.net/results.as...

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  • Posted on Jun 08, 2007

SOURCE: 56HM195 Light Engine Troubleshooting

you should make sure that the onscreen menus are effected by the problem if they look OK and just the video bihind them is distorted the problem is in the digital video or what Toshiba calls the seine module. Probably not though it sounds like an engine. PTS electronics rebuilds some engines however most Toshiba engines are relatively reasonable.

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