Dmtech lm37xty lcd

[joehezzer]

OK so i got given a dmtech lcd screen,i turns on to stand by the red light comes on for about 5 seconds then goes out. when i first got the set it came on for about 5 mins then turned off. i took it apart and started to have a fiddle i thought to start i would test the supply and while i was there i changed a few caps marked red. i cannot see any damage to the board



ok so i started to test the supply with my meter, con 1 i have been testing



i got 5 volts where it said 5 volts and 12 volts where it said 12 volts etc. the only part i never got anything on is where it says power, got no reading at all.my question is i am right at thinking i should be getting a reading there. thanks in advance

[joehezzer]

Re: Dmtech lm37xty lcd

[joehezzer]

Re: Dmtech lm37xty lcd

.

[joehezzer]

Re: Dmtech lm37xty lcd

Any Anybody had any dealings with this product

[tom66]

Re: Dmtech lm37xty lcd

Never worked on one of these myself.
I would look at the mainboard myself. If PSU is giving 5V/12V it's probably OK.

[joehezzer]

Re: Dmtech lm37xty lcd

Cheers tom will have alook this week at some point cheers

[joehezzer]

Re: Dmtech lm37xty lcd



i have no power here, at the other end i just says on/off. this goes another board, i will post a pic when i get chance

[tom66]

Re: Dmtech lm37xty lcd

It's most likely the power on signal. Does it change at all when the TV's plugged in?

[joehezzer]

Re: Dmtech lm37xty lcd

no nothing at all

[tom66]

Re: Dmtech lm37xty lcd

Do you get a 24V output?

[joehezzer]

Re: Dmtech lm37xty lcd

i get 24volts where it says i should be getting 24volts and 5 volts where it says 5 volts.on the psu

[joehezzer]

Re: Dmtech lm37xty lcd

it does seem like the psu is working as i seem to have all the correct voltage except at that point on the psu

[joehezzer]

Re: Dmtech lm37xty lcd

i wonder if i have a dry joint somewhere

[tom66]

Re: Dmtech lm37xty lcd

OK, can we get a look at the main board?

[joehezzer]

Re: Dmtech lm37xty lcd

i will have a better look tomoz after work and i will post some pics cheers tom

[joehezzer]

Re: Dmtech lm37xty lcd

Ok just been taking the lcd screen apart I have got to the T con driver board would that be the main board

[joehezzer]

Re: Dmtech lm37xty lcd

ok this is the view of the back of the set

[tom66]

Re: Dmtech lm37xty lcd

Main board's the one with the video inputs on it.

[joehezzer]

Re: Dmtech lm37xty lcd

ok main board i cannot see any burning or bad caps

[ben7]

Re: Dmtech lm37xty lcd

^ Looks like a crack in one of the chips (large square one, about right-center); is it the chip, or is it the camera/other particles causing the 'crack' to show on the chip in the picture?