Hello.
A friend brought me a radio as in the subject with the following problem: after a dozen or so minutes (sometimes up to half an hour) from turning on, the display stops showing the content. After such a description, I expected that it could be caused by an increase in temperature and, consequently, loss or deterioration of connections. Here's what I've said and done so far:
1. I start the radio on the table without a CD drive connected and I keep it in the code entry state (4 zeros on the display)
2. After about a minute, some columns (pixel width) of the display begin to fade (contrast deteriorates)
3. Over time, more and more columns fade until after some time the entire display stops being legible
4. Radio with 12V power supply consumes almost 900mA of current
5. The HA13173AH system heats up very strongly even with a screwed heat sink
6. I have improved February connectors between the main board and the front panel board
7. I led to the disappearance of the content from the display and the entire interior of the radio and radiators cooled with the help of fans - unfortunately the display did not return to the correct display.
8. The heating system is a universal voltage stabilizer for Car Audio applications. I measured the output voltages at its terminals and are as follows: Foot 4 (8.24V), Foot 6 (7.87V), Foot 7 (3.24V), Foot 10 (8.28V), Foot 12 (11.39V) and Foot 14 (5.68V). While all voltages are lower than the catalog voltage by several hundredths of a volt, I am concerned about the voltage on the foot 14, which should be 5V and is almost 5.7V.
Unfortunately, I do not have a diagram to determine whether an overvoltage of 5V can pose a threat to radio electronics. Maybe one of my colleagues could measure the tensions in a good copy of the radio and give me values. Can such a display symptom be caused by damage to the LCD module itself? I am asking colleagues who encountered similar damages for a hint whether the repair is possible at all.
I count on help
best regards
A friend brought me a radio as in the subject with the following problem: after a dozen or so minutes (sometimes up to half an hour) from turning on, the display stops showing the content. After such a description, I expected that it could be caused by an increase in temperature and, consequently, loss or deterioration of connections. Here's what I've said and done so far:
1. I start the radio on the table without a CD drive connected and I keep it in the code entry state (4 zeros on the display)
2. After about a minute, some columns (pixel width) of the display begin to fade (contrast deteriorates)
3. Over time, more and more columns fade until after some time the entire display stops being legible
4. Radio with 12V power supply consumes almost 900mA of current
5. The HA13173AH system heats up very strongly even with a screwed heat sink
6. I have improved February connectors between the main board and the front panel board
7. I led to the disappearance of the content from the display and the entire interior of the radio and radiators cooled with the help of fans - unfortunately the display did not return to the correct display.
8. The heating system is a universal voltage stabilizer for Car Audio applications. I measured the output voltages at its terminals and are as follows: Foot 4 (8.24V), Foot 6 (7.87V), Foot 7 (3.24V), Foot 10 (8.28V), Foot 12 (11.39V) and Foot 14 (5.68V). While all voltages are lower than the catalog voltage by several hundredths of a volt, I am concerned about the voltage on the foot 14, which should be 5V and is almost 5.7V.
Unfortunately, I do not have a diagram to determine whether an overvoltage of 5V can pose a threat to radio electronics. Maybe one of my colleagues could measure the tensions in a good copy of the radio and give me values. Can such a display symptom be caused by damage to the LCD module itself? I am asking colleagues who encountered similar damages for a hint whether the repair is possible at all.
I count on help
best regards
, well, I said it wrong, but at least now I know that the radio can take about 1A and it is normal. 
