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TC9106 and SM5126 are both directly controlled by the same programming lines that drive the LED channel display. Not BCD like a uPD2816 or binary like an MB8719 or MC145106. This saved them from using an extra channel selector wafer to program the PLL separately from the display. Any invalid LED display code that the ROM code in the PLL "sees" will cause it to not function.

With the PLL out of circuit and desoldered from the board, does the LED channel display function correctly in all of the channel positions? Assuming the LED is functioning and no burned out segments.

If the channel display functions wrong, in any position, then the channel selector switch is bad or dirty, oxidized, needs replaced or taken apart and cleaned.
If the LED display functions correctly in all of the channel positions, and you put the PLL (socketed) back in, if the LED was working without the chip, and now displays weird, one or more of the programming lines in the PLL may be shorted.

According to http://www.radiomods.co.nz/integratedcircuits/pllpinoutspage.html, SM5126A or B has the same pinout as the TC9106.

<blockquote data-quote="NZ8N" data-source="post: 655946" data-attributes="member: 51368">TC9106 and SM5126 are both directly controlled by the same programming lines that drive the LED channel display.&nbsp; Not BCD like a uPD2816 or binary like an MB8719 or MC145106.&nbsp; This saved them from using an extra channel selector wafer to program the PLL separately from the display.&nbsp; Any invalid LED display code that the ROM code in the PLL &quot;sees&quot; will cause it to not function.With the PLL out of circuit and desoldered from the board, does the LED channel display function correctly in all of the channel positions?&nbsp; Assuming the LED is functioning and no burned out segments.If the channel display functions wrong, in any position, then the channel selector switch is bad or dirty, oxidized, needs replaced or taken apart and cleaned.If the LED display functions correctly in all of the channel positions, and you put the PLL (socketed) back in, if the LED was working without the chip, and now displays weird, one or more of the programming lines in the PLL may be shorted.According to <a href="http://www.radiomods.co.nz/integratedcircuits/pllpinoutspage.html" target="_blank">http://www.radiomods.co.nz/integratedcircuits/pllpinoutspage.html</a>, SM5126A or B has the same pinout as the TC9106.</blockquote>

[QUOTE="NZ8N, post: 655946, member: 51368"] TC9106 and SM5126 are both directly controlled by the same programming lines that drive the LED channel display. Not BCD like a uPD2816 or binary like an MB8719 or MC145106. This saved them from using an extra channel selector wafer to program the PLL separately from the display. Any invalid LED display code that the ROM code in the PLL "sees" will cause it to not function. With the PLL out of circuit and desoldered from the board, does the LED channel display function correctly in all of the channel positions? Assuming the LED is functioning and no burned out segments. If the channel display functions wrong, in any position, then the channel selector switch is bad or dirty, oxidized, needs replaced or taken apart and cleaned. If the LED display functions correctly in all of the channel positions, and you put the PLL (socketed) back in, if the LED was working without the chip, and now displays weird, one or more of the programming lines in the PLL may be shorted. According to [URL]http://www.radiomods.co.nz/integratedcircuits/pllpinoutspage.html[/URL], SM5126A or B has the same pinout as the TC9106. [/QUOTE]

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