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IC7600 Display not working

Chris_1723

New Member
Mar 28, 2023
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Hello,
I replaced in my IC7600, the supposed LCD faulty for a newone and it still not working.So the LCD it not the real problem. Any clue what it could be the reason the display is not working. Thanks in advance. 73s. Chris
 

Voltages on IC604, IC604, VDD_5R9V, 3R3V or just replace display blind waiting for a miracle to happen?
Hello, I measured J21. 3R3V=3.2v,,,,,,5R9V=0v,,,,,,,,,VDD_5R9V=0v,,,,,,,,,DELL=1.79v,,,,,,,,,PWRL=1,56v
May be you can get any idea about this not voltage.
Thanks in advance
Chris
 
Before taking further measurements disconnect VR-C board to make sure there is no short-circuit. Disconnect a display too.
IC406 is first suspect. What is a voltage on pin 4 and pin 6?
What is a voltage on L402?
What is a voltage on R417?
You have to find where it disappears.
Mike
 
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First disconnect VR-C board to make sure there is no short-circuit.
IC406 is first suspect. What is a voltage on pin 4 and pin 6?
What is a voltage on L402?
What is a voltage on R417?
You have to find where it disappears.
Mike
thank you make, I hope tomorrow will check again.
THKS
 
Hello Mike, the measurements without VR-C
Regarding the IC406 (L164) pin1:0v, pin2:1,48v, pin3: 1,34v, pin4: 3,25v, pin5:0v, pin6:0v
R417 0v--0v
L402 3,08v-3,08v
this is the information,What do you infere from this. Many thanks in advance
Christian
 
On pin6 you should get VDD_5R9V voltage.
Remove q401 and check for any output on pin 6. If still 0 replace IC406 and also get new Q404 and Q401.
Also Q403 is suspected, but this later.
Mike
Great. I'll check removing Q401 and replacement will take time to find the items.Tomorrow information.Dziękuję
 
On pin6 you should get VDD_5R9V voltage.
Remove q401 and check for any output on pin 6. If still 0 replace IC406 and also get new Q404 and Q401.
Also Q403 is suspected, but this later.
Mike
Hello Mike,
I removed Q401 and not voltage on Pin 6.
L401 3,3V on both sides.
These are news.
So eventually, something is wrong with Ic406 while VIn (Pin 4) is 3,25v and not out thru PIN 6. What do you think? Best regards.Christian
 

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