Technics SX-PR603 the display goes off need your help!

Joined
Sep 5, 2022
Messages
2
Reaction score
0
Hi,C you help!

when i turn on the power for Technics SX-PR603 the display goes off with only the backlight on (blank blue flashing screen), and no sound is produce, and no sound from the headset either.

I should start with what do you think to check, I have the repair manual!, i don't want to move to many stock for startin'

Any help will be appreciate! Thanks in advance!
 

happyrat1

Destroyer of Eardrums!!!
Joined
May 30, 2012
Messages
14,180
Reaction score
5,697
Location
GTA, Canada
Power supply is working. Motherboard and / or display may require service.

Mucho expen$ive...

Unplug it...

Pick it up...

Shake it around...

see if anything is rattling inside?

That's where we start :)

Gary ;)
 

happyrat1

Destroyer of Eardrums!!!
Joined
May 30, 2012
Messages
14,180
Reaction score
5,697
Location
GTA, Canada
Step 2...

IFF no rattle...

Open it up. Keep records...photos, notes, etc...

carefully remove ribbon connectors, spray with Deoxit and carefully reassemble, then test.

Step 3 is on a need to know basis IFF previous step failed.

cross yer fingers :)

Gary ;)
 
Joined
Sep 5, 2022
Messages
2
Reaction score
0
Power supply is working. Motherboard and / or display may require service.

Mucho expen$ive...

Unplug it...

Pick it up...

Shake it around...

see if anything is rattling inside?

That's where we start :)

Gary ;)
Thanks Gary
Thats a start
Stay safe
 
Joined
Dec 7, 2022
Messages
1
Reaction score
1
Hi Cobra360,

I had a similar problem with the SX PR703. After power on the only thing i get is a blue screen. First i thought the reset circuit was the problem but I figured out that this has to be a boot problem of the processor and the suspected item is the flash memory. I checked the connections to the chip IC11 and found one track that was broken, i repaired that but still no luck.
At the end i decided to re-solder all the pins of IC11 - i just melted the solder pin by pin - and YES the keyboard is functional again.

Hope that helps you. Be careful with static electricity, i have my soldering iron connected with 100k resistor to the ground-plane of the circuit board while soldering.

Good Luck
Jan
 
Joined
Jan 14, 2021
Messages
130
Reaction score
25
Location
Zolder.B
Hi
As far as I can remember the power supply is divided into two sections.
section 1: + and - 15 voltage regulators
section 2: +VCC and -VCC for the power amplifier.
So check these voltages for the backlight and the sound.
Is there an error message on the screen ?
Good luck and stay safe
mris
 

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Members online

No members online now.

Forum statistics

Threads
14,355
Messages
89,237
Members
13,311
Latest member
monyi

Latest Threads

Top