Hi all. I have a problem that seems common with ACER AL2671W TV. I can not get turned on, ie, remains on standby with front led yellow, even if I press the power button, it remains in stand-by. I have checked the power supply outputs (5, 12 and 24 V) and seem to be correct. I replaced all the electrolytic capacitors on the main board (DA0VT3MB6D6, REV: D), (20 of 470uF/16V 100uF/16V and 8), but television remains on stand-by. I have some questions: * I measured the 100 uF electrolytic capacitors replaced and I've seen values ??such as 2 or 3 uF in several of them. Can anyone confirm that there are only 100 uF electrolytic and 470 uF on this board? * Is it normal that the brown wire (the one that turns the power supply on) is at 5 V when the TV is in standby mode? * I've found that the power switch works. I can see how the input voltage at pin 16 of the microprocessor (microchip PIC16F7) goes from 3.75 V to 0.05 V when I press the power button. I do not see any other microprocesor pin changing. The brown wire is connected to pin 23 which, as mentioned, is high even though the TV is on stand-by. Is it possible that the microprocessor is not working properly? Any suggestions will be very aprecciated. Thank you very much in advance. Regards Guillermo
SOURCE: Hello, i´m repairing an Acer AL2671W, the
Eooow! Tough one. One of the main reasons why DLP Pictures are "weak" is not due to lamps or main board settings for the screen. The "weak" picture is due to the dirty (and I mean dirty!) mirrors BEHIND and BELOW the main screen, and possibly due to weak or dirty lamps and associated mirrors/lenses. Remove the "Front Screen" completely (not just the outer lens assembly) and check for internal dirt on associated mirrors inside the screen area. Disconnect any cables to the screen controls first (if any).
SOURCE: I have a AL2671w LCD Acer TV ON OFF switching
looks like the same problem i have with my 32" acer tv, it seems to be a problem of acer TVs get someone to check the capacitors in the power supply.... I think one might be bad.
SOURCE: acer lcd tv al2671w. This LCD TV does not switch
This is a common fault solution which can be checked and corrected by you assuming that there is no component failure . There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance. The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points. Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault. Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing. Check for tips to look into the SMPS unit: http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies
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I can not find on Internet where to buy the main board for this TV (DA0VT3MB6D6, REV: D). Do you know where can I buy it?
Any one knows where can I find the code for the PIC?
Any other sugestion?
Thanks in advance
Regards
Guillermo
Some more data...
Since I am working with this TV, only 3 times started with blue led when I plug it to the wall socket. The TV was working with the display on, but the main power button does not put the TV to stand-by.
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