TS-50 FIX: LCD display dark
From: DJ7UA @ DB0QS.#NRW.DEU.EU (Mario) - 19-07-1998
No display illumination, LEDs On Air, AT TUNE no function The menu item 2 has no effect, display keeps always dark. All other functions normal.
Bad contact LCD Assy for 5V line to R9, R10 and IC5.
Power on the TS50 and check voltage at R9/R10.
If voltage is 0V, but display readout is active, the reason might be as discribed.
Measurement to fix it:
Look for the small hole near R9 at the LCD Assy, component side view, where the contact between the two sides of the LCD Assy is located.
If you have no service manual:
This is the side oriented to the front side of the device.
R9/R10 are located close to the two LEDs.
Take a small size needle to pick through the contact hole to encrease the diameter.
Make a contact between the two layers by soldering a piece of wire across the hole.
Check the 5V at R9/R10.