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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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"Jim Lazzaro" wrote in message
om... If anyone could please advise me about what keeps the memory of the last channel viewed before switch off. TV is a Philips 14CN2001/75S, it doesn't have a remote. I am unable to find any batteries or supercaps. The problem is when switched on the TV starts on channel 0 (sound is okai)regardless of what channel it was used on. Unfortunayely I do not have schematics and also I don't see any eeprom on PCB. EEPROM is probably incorporated into the micro that controls the TV. IT might pay you to track down the service manual from High Country, hcsd.com.au I think. |
#2
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Do you switch it on at AC power or from stand by?
It should remember channel when you do from stand by, but it does not have to when you do at mains. If yoour PP (sound, brightness, etc...) stay same and channel tune is OK, I would think memory backup is fine. Rudolf "Jim Lazzaro" wrote in message om... If anyone could please advise me about what keeps the memory of the last channel viewed before switch off. TV is a Philips 14CN2001/75S, it doesn't have a remote. I am unable to find any batteries or supercaps. The problem is when switched on the TV starts on channel 0 (sound is okai)regardless of what channel it was used on. Unfortunayely I do not have schematics and also I don't see any eeprom on PCB. Thanking you in advance. Jim |
#3
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I have not worked on this model, but can be general.
This can get fairly compex for the novice. If you want to fix this yourself, you would have to invest in the service manual and see how your particular model does the memory operation. You will have to understand the schematics, have the proper tools, and follow procedure to locate the fault. The problem is most likely associated with the main uPC. There may be a CMOS ram or an EEPROM involved. Depending on the design, this can be an integral part of the uPC, or some other IC device. Some sets also have a cap, or battery for this function. There are a number of ways that the memory is retained. I have also seen firmware problems in sets where the uPC, and or the IC that does the memory control and function be replaced. If this is the case, the associated IC's had to be replaced. I have also had some support components for the controler area fail, thus causing memory problems. I would suggest you give the set to an authorsed Philips service rep if you are not able to do this type of service. This is very specialized work. Jerry Greenberg -- (Jim Lazzaro) wrote in message . com... If anyone could please advise me about what keeps the memory of the last channel viewed before switch off. TV is a Philips 14CN2001/75S, it doesn't have a remote. I am unable to find any batteries or supercaps. The problem is when switched on the TV starts on channel 0 (sound is okai)regardless of what channel it was used on. Unfortunayely I do not have schematics and also I don't see any eeprom on PCB. Thanking you in advance. Jim |
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