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Samsung LE40A455C1D - Red flash.

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downunder:

Hi Chris,

We are assuming the eeprom is faulty. Short out pins 5 and 6 if of the eeprom if you suspect the eeprom is disabling the TV.

Have you tried unplugging the PSU from the Main and forcing the PSU on (100 ohm R between STB-5V and PSU-ON) to make sure the PSU itself is functional and generates the right voltages.

Otherwise, you can solder a long link across pins 5 and 6 of the eeprom, refit the main board, turn the set on then cut the link after a few seconds. If the eeprom is still functional, it will reinitialize the eeprom. Bring the tv out of standby and perform a factory reset in the service mode. Have saved many Sammies this way.....only once did I have to put a new eeprom in, and it initialized itself. Good idea to check the options afterwards.         
   
See how ya go.

Bruce

Turnip:
Hi Bruce, and thanks yet again,

Sammies are famed for duff PS caps corrupting Eeproms so that was my first thought,

though on replacing the duff caps where the set worked normally, thought I was on to an earner,

'till next day when it came back where I replaced all other secondary caps to no effect and guessed the Eeprom had possibly bolted overnight.

Guess shorting pins 5 & 6 as you suggest will either clear of confirm Eeprom issues.

Can't wait to try - Thanks again for the 'heads up' - Chris

Turnip:
Hi Bruce,

Tried check Eeprom and got a whole page of 'F's using the clip, then soldered Eeprom with LMP to a header.

Still a page of 'F's so suspect Eeprom is duff. Note chap on Ebay is doing genuine AT24C256 chips at a pound inc post while stocks last.

Thought get some, as Sammies are troublesome, and mostly use the same chip.

Still curious as they are supposed to reload from somewhere within the set, but good folks have supplied bins that might be useful.

Curious, as ever, will be fun when Atmel 24C256's arrive - Chris

downunder:

Hi Chris,

The proof of the pudding, as they say. Guess eBay is the modern-day version of Oil-drum Lane. Harold should have kept up with the times.

I did once fit a conventional-pin eeprom to a Sammy. It worked, but never again. Those solder pads are way too small for such extravagances.

Bruce

t1412:
hi turnip can't you use a 24lc256 also check for dry joints on transistors thanks,

shaun

 

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