LCD Screen-black spots

Put sticky tape over the bits that should be there.

Put sticky tape over the bits that should be there.

Replaced the damaged lcd display.

Now Dave, are you ?rat sure that those are positioned ?vetically? ? Now by my being blind to your

situation , e.g., not having the unit in hand for an eyeball QSO, could you confirm that that

condition is maintained even when there is no power or batteries in the unit.

(And even that thought process could be flawed in the respect of retentive charge in the ua

current levels and low voltage levels still being maintained by capacitive elements in the radio

for some time period after unpowering?..still adequate to effect a display action)

Also, was there any possibility of errant electrolyte seepage from defunt batteries involved.

My thinking would lean towards a contamination of a string of pixel elements in the LCD array

to cause that effect. Or, my most common finding is a loss of connectivity thru a connector to

the array. This can usually be confirmed by powering up the display and enacting a moderate pressure to

the x-y planes of the displays front bezel assembly, hoping that will transfer enough movement

to the internal connector area to cause a corrective action in portions of the display, thus tipping

you off as to a display connection being the problem. Don?t..rpt?DON?T exert pressure to

the threshold of fracturing your displays glass front face, however. Also there might be the possibility of pressing on the rear of the displays contact area via an

orange stick, wood dowel, etc., if access was obtained to inside the receiver housing after a partial

disassembly. Should you find a corrective manner by pixels changing in that prior probing procedure,

the most common cause of that condition is the manner of construction and the specific materiel

utilized in interfacing to the display. If you stored that unit in a heated environment (sun ravaged

car or storage building, etc)?..it is also more abject to failure. Should this exploratory action have

changed the display, get back to me and I?ll update you on what I usually find that fixes the situation.

Edd, I checked the HTX-404 this morning and found following wrong. 1. BNC connector is mechanically loose but electrically OK. 2. TX output is 0.5 watt in Hi PWR mode with 13.8volts power. Draws .2 Amps [3.6 watts] to create 0.5 watts RF out. 3. LCD display has spots but can read most of screen.

1. 12 hours storage disconnected from BP did not change spots. Pressing LDC display glass/bezel did not change spots. I did not open case and apply pressure to LCD connector area from back of radio.

I am not going to put the money/labor into repairing this radio. It's future use will only be as a receiving scanner. Thanks for reply and diagnostic suggestions Edd,