IC-621-2-TR display problem ?

[merlin]

Picked up a couple toys, the IC-621-2-TR. There is no display or backlight and wondered is anyone has run into this and the fix.
I ordered the service manual, but it will be a couple weeks. Also noted a document mentioning no display issues.
These are on my front burner and want to get them back together to clear my bench.
73s

 

[12dbsinad]

Take the front cap off and check for liquid intrusion. Check for things that look "green". It's fairly typical to have the display fail due to liquid.

 

[jeepsandradios]

As said pop display off and check connections. I have one that has no display. It was pretty corroded. Cleaned up and still nothing. I use it on my APRS anyway so didn't mess much more with it.

 

[merlin]

No sign of internal damage but winging a troubleshoot, what should be 5 V is more like 3.2 so something awry with the power circuits. Pretty simple radio, shouldn't be a hard fix. Might have this running before my manual gets here.
>found the 8 V regulator but I think it is switched off for no signal from the brain.
Pressing the power button, there is a bit of current(35Ma) so not hopeless.

 

[merlin]

WOW, Not far off, the main power switch transistor is bad. Bypass with power on button, the radio works.
Pulled the device and a bad bulge.
The display I can't make out, either a system name 'east' or something like 'test'. I will know when I program this.