Toshiba 32bv50 Flashing LED

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Hi

Got this TV and the PSU 17pw25-4 had been through a power surge and basicallydestroyed the board (It blew the tracks from the board)

Replaced the PSU with a 17pw25-3 It has exactly the same pin out as the 4 and cheaper

Connected it up and the tv was dead, the psu voltages were right, so I put it down to the 17mb60 4.1, my mate had a smashed screen with the same board in fitted it and now the front led is flashing and the voltages have gone a bit odd

ie
The 24v rail = 25.8v
The 12v rail = 11v

I seem to be getting 8v readings across a couple of the voltage regulators, never seen 8 volts on vestels before...is this normal

Any help appreciated

[tom66]

Re: Toshiba 32bv50 Flashing LED

Quite surprised to see a UK TV damaged by a power surge, very rare.

Crappy pretend Toshiba...

Front LED flashing could be problem with touch panel buttons, main board or power board... Some newer T-cons have EEPROMs on them for model number, did you match that up? 25.8V is very high for 24V. Try putting a load on it and seeing if it drops.

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Re: Toshiba 32bv50 Flashing LED

Quite surprised to see a UK TV damaged by a power surge, very rare.

The Electricity ran out apparantly when the tv was on then wouldnt come back on...to be honest it did make a mess of the underside of the board and a nice burn mark on the back of the screen

Crappy pretend Toshiba...

Yep

Front LED flashing could be problem with touch panel buttons, main board or power board... Some newer T-cons have EEPROMs on them for model number, did you match that up? 25.8V is very high for 24V. Try putting a load on it and seeing if it drops.

SOrry my mistake if I disconnect the main from the psu it is still showing 25.8v and if I put the 10ohm 11watt resistor in it seems to lose all voltage

I am sure I have had one of these before with same symptoms and it was one of the many diodes on the psu but they all seem to be ok
And guess what I bought the psu off ebay grrrrrr

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Re: Toshiba 32bv50 Flashing LED

Just replaced d938 and it booted straight up, must be breaking down under load as it tests ok out of board with dmm

[tom66]

Re: Toshiba 32bv50 Flashing LED

Ugh, does ANYONE check the boards they sell on eBay? People like that make the recycled boards trade look like a bunch of idiots...

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Re: Toshiba 32bv50 Flashing LED

Changed my mind tom, I have just built the tv back up gone to turn it on and now the front led is bright then within 5 seconds it dims down to nothing and dead again

I am getting sick of ebay at the minute, thought things came in 3's this is about the 5th dodgey part in as many weeks

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Re: Toshiba 32bv50 Flashing LED

I take that back it must of just been luck, the psu is fine, put it in a working tv and its fine, so there is something on the main that is causing the fault, at least I have had it working once so there is hope yet

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Re: Toshiba 32bv50 Flashing LED

Fixed:- 17MB60 4.1

Replaced the 22 x 16v SMD Cap Board Position C1031, it is positioned right next to the card reader

[tom66]

Re: Toshiba 32bv50 Flashing LED

Good to know, interesting to hear they caused the fault. Perhaps they were the problem before and got worse and worse before power surge got it.

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Re: Toshiba 32bv50 Flashing LED

If I am being totally honest a friend looked on a Database and the 17MB60-3 (the only difference is the LVDS position) had the same fault where a diode showed a short to ground and it was the cap at fault...Happy Days

It was a right tricky little bleeder to get out as its right next to some seriously small smd's on a delicate little vestel that will lift tracks if you sneeze :o)

[notallbad]

Re: Toshiba 32bv50 Flashing LED

Did you establish whether 8v was normal or not?