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digitalscorpion
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 Posted: Wed Jul 01, 2009 6:26 pm Post subject: toshiba 32AV500U LCD inverter ? |
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LCD model: 32AV500U
Has 2 inverter PCBs, Master and Slave. I have service manual. How can I go about finding which PCB is defective? Nothing visually bad. Does LCD need both functional to work? Any hints in right direction greatly appreciated. |
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jts1957
Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away
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| Posted: Wed Jul 01, 2009 9:50 pm Post subject: |
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| What is the "Complaint?" |
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digitalscorpion
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| Posted: Wed Jul 01, 2009 11:39 pm Post subject: |
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there is no backlight...
already diag'd to the source.... just wish I had more info from this point. No individual PCB schematic. No way to determine if both master and slave inverters are shot or just one. If so, does this LCD TV require both....? |
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jts1957
Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away
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| Posted: Thu Jul 02, 2009 1:08 am Post subject: |
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Or Bulbs?
Make comparative resistance readings of primaries / secondaries of transformers - one may be open. |
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minnie
Joined: 18 Aug 2005
Posts: 2880
Location: Hell
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| Posted: Tue Jul 07, 2009 11:49 pm Post subject: |
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| 32" should just be one. |
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digitalscorpion
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| Posted: Thu Jul 09, 2009 6:25 pm Post subject: |
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There are two different revs/versions. One has single, one has dual (master/slave).
Still havent fixed, any more help out there? :/ |
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Dan the TV man
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| Posted: Fri Jul 31, 2009 4:46 pm Post subject: inverter boards |
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| More bad news,it may not be inverter boards.It could also be t-con(lcd control board)over screen,Id replace capacitors in both inverter boards,and see what that does.you may have to replace all 3 boards. |
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calleriq
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| Posted: Mon Aug 24, 2009 3:51 pm Post subject: Toshiba 32AV500U |
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| my toshiba 32AV500U HDTV has green light but noting on the screen, what could posible wrong? Any suggestion, idea? please help, thanks |
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Dan the TV man
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| Posted: Wed Aug 26, 2009 8:34 pm Post subject: Toshiba |
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| Do you have sound ,and no picture.Probably inverter board(s).If you have no sound or picture,check for bulged capacitors in the power supply.If the power supply works you probably need a main board,also called a scaler board,or tuner board.The one the tuner and RCA jacks on it. |
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bradandjaya
Joined: 12 Oct 2009
Posts: 6
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| Posted: Mon Oct 12, 2009 3:59 pm Post subject: Another Toshiba 32AV500U w sound and no picture |
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A neighbor was throwing this 1.5 year old HDTV away... Now I know why.
Looking at the inverter boards, the master has had the 300uF capacitors and mondo transistor replaced at some time. The board is getting 24V on pins 1-5 of connector 1, and fuse appears to be in original, un-blown condition.
Other than indications of the above repairs, everything looks ok visually. I will check the transistor inputs to see if one is open, as I believe that is the issue.
Any ideas on how to get a supply of transistors (marked 331 81BHK)? Or is there a longer term fix to keeping this device working?
Brad |
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