Technika LCD 32-270 - stuck in standby

[drw25]

Hi there,

I've got a Technika LCD 32-270 (aka. M32/57G-GB-FTCU-UK), which is currently stuck in standby. When the power supply is on, it simply lights the red standby LED, and shows no sign of life when I press buttons on the side panel or remote control.

Directly before this happened, the TV picture was replaced by a bright green distorted mess and the sound by loud white noise - this lasted a few seconds before it turned itself off and went to standby. The same thing also happened a few months ago, after which I left it turned off for a number of weeks, and it miraculously started to work again until now!

I've opened it up and had a look at the capacitors - no obvious bulging, but there is some gunk on the positive leg of C7 on the PSU board (see pics). +5VSB measures about 4.9V constantly on my multimeter and +5V about 4.7V, +12V is very low (varying between approx. 0-4V) and +24V is dead. Should I expect all these voltages to be high, even in standby, or are they only turned on if the logic board asks for them? I guess I'm mostly trying to work out if it's the PSU or logic board at fault here.

Any recommendations for my next move?

Thanks in advance!
Dan

[handsomedude]

Re: Technika LCD 32-270 - stuck in standby

c7 on picture 1 not good. change it

[ReeceyBurger123]

Re: Technika LCD 32-270 - stuck in standby

Ok I have worked on one of these before they are nasty poorly built sets,the psu had the same issue you have I found the fault to be it to be a bad switching transistor on the primary side firstly desolder them and check them, do you know how to check them ?
Also check c7 (primary) cap as it appears to be leaking ?

[Andrew F. Ali]

Re: Technika LCD 32-270 - stuck in standby

Agreed...C7 needs to be replaced....99% sure this will solve the problem.....1% it may also be something else.

[drw25]

Re: Technika LCD 32-270 - stuck in standby

Thanks guys - I've ordered a replacement for C7 - will let you know how I get on!

[ReeceyBurger123]

Re: Technika LCD 32-270 - stuck in standby

It might not be c7 as if that failed there would be no voltages at all but try that first to rule that theroy out.

[drw25]

Re: Technika LCD 32-270 - stuck in standby

Changed C7 but ReeceyBurger was right - it didn't fix things. I'm wondering if it might be a logic board problem, given the corrupted video and sound beforehand, but power supply components are cheaper than buying a new board so worth ruling them out first! I guess I should be checking ICS1, ICS4 and Q5 (in pic 2) in terms of transistors?

[budm]

Re: Technika LCD 32-270 - stuck in standby

Are there any labeling on the connectors of the power supply? You need to find the PS_ON pin which gets the signal from the main board to turn on the rest of the power supply. Please read my Basic LCD TV Troubleshooting guide.

[drw25]

Re: Technika LCD 32-270 - stuck in standby

Thanks for your message budm. Just tried triggering PS_ON myself with a resistor to 5VSB, then:

24V rail measures 23.4V
12V rail measures 11.8V
5V measures 4.8V
5VSB measures approx 5V

These look OK to me, so seems the problem is outside the PSU?

[budm]

Re: Technika LCD 32-270 - stuck in standby

Yes, that means the main board is not sending the signal to turn on the power supply

[ReeceyBurger123]

Re: Technika LCD 32-270 - stuck in standby

Ok on the main board there will be a set of resistors I will put a ring a round them, they should send the psu start signal.

[flocko]

Re: Technika LCD 32-270 - stuck in standby

As you have correct voltages from power board, I would put my money on the eeprom on the main board normally U10 on these T.MSL 306 main boards ,but were you get one that another story ? but don't try to short it that will not work Flocko

[ReeceyBurger123]

Re: Technika LCD 32-270 - stuck in standby

Try the eeprom first if not I will show you what to check next.

[budm]

Re: Technika LCD 32-270 - stuck in standby

There are 3-pin Voltage regulators on the main board that you need to test the Voltages on all 3 pins.

[flocko]

Re: Technika LCD 32-270 - stuck in standby

Hi just had on look on OHM Supplies site they list eeproms for Technikas with T.MSL 306 mains but not with your board number ( T.MSL 306 6B 10251 ) and as Andy has the biggest range of eeproms over here in the uk, I think you will have to get replacement board its a common problem with these sets Flocko

[Clydeuk]

Re: Technika LCD 32-270 - stuck in standby

If you can be bothered trying to cope with Russian translation monitor.net.ru has a lot of EEPROM dumps, only useful if you have something to program them with though. I doubt you'll find a match but using the board number you may find something close. Obviously no guarantee if you can even find one that it will be any good options wise.

[drw25]

Re: Technika LCD 32-270 - stuck in standby

Can report that a new logic board fixed it. Unfortunately the screen got cracked moving house so it's now a write-off, but good to have found the solution to the problem! Thanks all for your help.

[ReeceyBurger123]

Re: Technika LCD 32-270 - stuck in standby

Thats a pain, normaly replacement lcd screens for these sets are around £130 but its not worth it as you can get a good 32" lg for around £250 that will last alot longer than this junk.
Take care pal

[tn245]

Re: Technika LCD 32-270 - stuck in standby

Hi. I have the same model with the same problem. Does anyone have the firmware bin file for the SPI? I can write the SPI myself so no point buying a programmed chip. Thanks!

[vinceroger69]

Re: Technika LCD 32-270 - stuck in standby

if you freeze the spi chip does the set start if it does take a copy of the file i have saw this method mentioned a few times even norcal on youtube has a video on it.
https://www.youtube.com/watch?v=Qy8fh-g5DOM