Re: Acer AL2423W Recapped, backlight works but no display
Hello, Per.
All the same I managed to recover the monitor. The last time when the monitor has again refused to work, I has thrown it in a far corner. Then, after a while has decided again it to look. Has checked up an oscillograph all power supplay - all normally. Has then looked Flash-rom - activity on information outputs is watched, i.e. the processor and flash work!
Began to look further, and in at last has found the reason - diode D18 in the voltage regulator on 1.8 volt.
On it too big voltage...
ndugu
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Last Activity: 11-22-2010, 08:04 AM
Joined: 08-01-2010
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Re: Acer AL2423W Recapped, backlight works but no display
Yesterday again reflash my chip, at power up - then the screen short-term seemed has gone out, to buttons did not react. Has checked up flash - the code is corrupt after 7D002 address. Has anew programmed, the screen monitor has ceased to switch on, to buttons does not react. Again the code is corrupt after 7D004 address.
It seems that the processor, флэш here not has died and. Indirect tags that the processor unsuccessful it not datasheets on a site of the manufacturer, also are not...Leave a comment:
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Re: Acer AL2423W Recapped, backlight works but no display
I congratulate. However take your time to rejoice, in my case breakage has repeated in 1-1,5 months. Tell you has programmed the same Flash chip or new?
It I to that can be because of the bad power supplies Flash chip have acquired some deficiency and in due course the data are distorted. Then would be correct to deliver a new chip.
In my city on sale there is no given chip, therefore I cannot check up my theory.
Please inform me on [email]rus_69@mail.ru[/email] if breakage repeats. If will not...Leave a comment:
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Re: Acer AL2423W Recapped, backlight works but no display
Parable:
- What do you search under a lantern?
- The key has lost.
Where you have lost it?
- Yes on that road.
Why here you search?
- Here is more light...
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Re: Acer AL2423W Recapped, backlight works but no display
EDID-information can be read directly from U1 2402 on bus I2C without involvement of the processor.
Parable:
- What do you search under a lantern?
- The key has lost.
Where you have lost it?
- Yes on that road.
Why here you search?
-zdes is more light...Last edited by ndugu; 08-05-2010, 04:32 AM.Leave a comment:
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Re: Acer AL2423W Recapped, backlight works but no display
20 MHz it is enough. About waveform - a signal not periodic what can be the form - simply you observe activity of a signal in a big way no more Vcc for U8. If after short-term activity the signal disappears, the processor means has hung.
If the processor does not react to pressing of buttons it speaks that the processor does not work - or it is stopped because of program failure, or has broken. In this case business does not reach bus LVDS.
Look also at a reset signal on the processor, the reason...Last edited by ndugu; 08-05-2010, 12:31 AM.Leave a comment:
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Re: Acer AL2423W Recapped, backlight works but no display
Yes, it is desirable an oscillographLeave a comment:
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Re: Acer AL2423W Recapped, backlight works but no display
[QUOTE=Per Hansson;116676]Welcome to Badcaps and thank you very much for your post ndugu!
Did you have to use an oscilloscope to measure pins 2, 5 & 6 on U8?Re: Acer AL2423W Recapped, backlight works but no display
[QUOTE=Per Hansson;116676]Welcome to Badcaps and thank you very much for your post ndugu!
Did you have to use an oscilloscope to measure pins 2, 5 & 6 on U8?Re: Acer AL2423W Recapped, backlight works but no display
[QUOTE=Per Hansson;116676]Welcome to BadcapsLeave a comment:
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Re: Acer AL2423W Recapped, backlight works but no display
In processor GM5861H there is no internal memory of the programs, all program code is stored in SPI Flash SST25LF040. At monitor inclusion look on pinouts 2, 5, 6 microcircuits U8 go an exchange of the information or not. In my case, at power up there was a short-term activity (1-2 seconds), then the activity termination. It says with the big share of probability that the program code is deformed.
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