Aug 5, 2020
I have a Powermatch PM8500 amplifier, and its Screen is turned off , but i can to communicate with the ControlSpace software, i've done the firmware upload via Recovery mode, turned on just the leds light indicator during the process, on computer worked well. The same amplifier had a surge voltage before, and i 've found a burned I.C TNY280G , its function is start up the amplifier, so I fixed it, i'm a maintenance electronic Tecnician here in Brasil, by Loudness Company. I'd like to find a service manual, or any detailed explanation about this problem, coud you help me guys!?
Oct 27, 2017
Jan 6, 2021
I ran into to exactly the same thing, could it be a design problem?
The tny280gn was blown as well as the fuse. Replacing it turns on the 9.5Vdc rail as well as the 3.3Vdc on secondary side and the 5Vdc on the small daughter card on the primary side. The three LEDs lits up on the front and you can put the unit into recovery mode(the faults led turns on) and you can talk to the unit over USB and do FW upgrades, but nothing more.
The rest of the power supply card does not start as the signal from the "main" card that enables(via a set of optocouplers) amongst other the 12Vdc section of the power supply is low.
Would very much like to repair it as it's out of warranty, it would be very helpful with the schematics or at least the pin-out of the connector between the main card and the power supply card.
Jan 14, 2021
I have the same problem, except from the burnt out TNY280GN. One day, the PM8500 just died.
The backlight of the display is on, but nothing on the screen. After a short while, the fault LED comes on. All other LEDs are on all the time.
I have tried connecting to the service serial-port on the mainboard, but I can't get the serial-settings right.. Only mumbo-jumbo coming out on the terminal. Does anyone know the correct serial-setting or if it is a specialized serial-protocol/BUS?