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Equipment Repairs => LCD TV forum => Topic started by: scooby-doo on August 05, 2011,16:42:58

Title: Vistron 37 No model number stuck in standby
Post by: scooby-doo on August 05, 2011,16:42:58

Hi I have a problem with a Vistron 37" TV sorry there are no model numbers, but I need hel with what seems to be a usual fault.
The tv turns on to the blue standby light and nothing more, I have checked all the voltages from the PSU and all seem very good and on the button.

I keep coming across the main board having problems with the firmware having a mad fit, but I cannot find anywhere to sort the problem, has anyone had the same problems with this set, I believe it is the same with the 32 inch Vistron too.

The board I seem to be having problems with is HH.LCD-PCB.Y0-105 if that helps

Thanks for any help you can give on this one.

Title: Re: Vistron 37 No model number stuck in standby
Post by: mulja on August 06, 2011,04:16:16

This is vestel chassis??????????
post pictures if not

If power supply ok then could be eeprom

Title: Re: Vistron 37 No model number stuck in standby
Post by: Turnip on August 06, 2011,13:04:13

Hi S/D,

There's some back threads mentioning PS caps - a couple of 1000/10 and a 470/16 but no maker identified.

Pics are useful if you can't identify model or panel info - Chris.

Title: Re: Vistron 37 No model number stuck in standby
Post by: scooby-doo on August 06, 2011,16:31:32

Hi

Cheers Chris, all the caps are fine, all the voltages are all fine I am going down the same route as mulja, eeprom issues, the trouble is now is I cannot get any numbers off the back of the eeprom so I am struggling a little with this "Turkish Delight"  :41:

Title: Re: Vistron 37 No model number stuck in standby
Post by: ebanks_les on August 08, 2011,11:15:27

Hi Guys
 Sorry to intrude in discussion  but Having similar probs with my Vistron 37 inch-
suspect the same signals mainboard as mentioned (psu seems OK)
Can u mention the board ref of the eprom so can also try and identify it- will be U--- something
BTHW There is a supplier of blank /ready to burn eeproms on ebay (usually 16 pins ) although advert is  for laptops eproms -generically same chips and programming (?)

Thinking of reprogramming the identified  Vistron eprom   using a Samsung eprom chip dump (ie or another suitable .bin file)for 37 inch model via  the  TV 's serial interface port connected to  my laptop.
This is way I believe most corrupt eproms are corrected by TV Techs very  tricky but doable with patience
 otherwise swopping in proven Tv  eproms might be a solution  ?
 
Ur Info and comments  would be welcome  Cheers Les

Title: Re: Vistron 37 No model number stuck in standby
Post by: sparky on August 08, 2011,12:10:43

hi
believe most of eeproms are 8 pins
dave
post a pic of signal board

Title: Re: Vistron 37 No model number stuck in standby
Post by: Turnip on August 08, 2011,12:26:28

Hi S/Doo,

Did you say 'Turkish Delight'  ? - lay on those Vestel piccies - Chris.

Title: Re: Vistron 37 No model number stuck in standby
Post by: scooby-doo on August 08, 2011,14:35:57

Here you go.

(http://www.inspectabike.co.uk/1/1.jpg)

(http://www.inspectabike.co.uk/1/2.jpg)

If this is any better

http://www.inspectabike.co.uk/1/1.jpg (http://www.inspectabike.co.uk/1/1.jpg)
http://www.inspectabike.co.uk/1/2.jpg (http://www.inspectabike.co.uk/1/2.jpg)

Title: Re: Vistron 37 No model number stuck in standby
Post by: scooby-doo on August 11, 2011,05:50:29

Hi Again

In the second picture could someone please tell me what the 4 pin blue connector is for, its location is down in the bottom left hand corner just above the VGA socket.

Could I also ask where you think the eeprom is on this thing, I thought it was either the chip just right/up of the small heat sink centre of the board or the one bottom left of the heatsink.

Any help or guesstimates would be greatly appreciated.

Title: Re: Vistron 37 No model number stuck in standby
Post by: watteau on August 11, 2011,11:17:23

Hi,
Sorry, don't recognise the board, but the blue socket is probably for programming,
as for the EEPROM, I would also probably go for the IC near the top-right of the main IC
(the one with the heat sink).
Check the voltages on pins 5, and 6 of this IC (the data lines), and if they are the same
(about 2v), you could try a reset, similar to the SAMSUNG (keep these pins short
while switching on, and release) - if these these voltages are different, the IC is
probably one of the versions that use write protection, and this method won't work,
Good Luck,
John.

Title: Re: Vistron 37 No model number stuck in standby
Post by: scooby-doo on August 11, 2011,12:43:32

Hi

Thanks, I got the data of the chip and this is the pins, I have also put the readings I got from each pin

1=CS# = 3.27v
2=DO = 3.27v
3=WP# =0.0v
4=VSS = 0.0v
5=DI = 0.0v
6=CLK = 3.27v
7=HOLD# = 2.46v
8=VCC = 3.27v

Like you mentioned shorting the pins 5&6, doesnt do anything
What is the options now as you mentioned something about write protect, (Pin 3)

Is there away around this or do I now need equipment to reset the eeprom.

With thanks

Title: Re: Vistron 37 No model number stuck in standby
Post by: watteau on August 12, 2011,08:28:58

Hi,
Sorry I don't know of a way of resetting these type of EEPROMs.
You could try changing it with a blank one, if  you know the type.
Good luck,
John.