Why on earth did he not resolder it. Worked on TVs for years and never replaced a PCB for a dry joint. Most TV guys can resolder a dry joint so it won't fail again.
As for £180 for a PCB that probably costs a fiver to make!
Some of the SMD ICs used these days have 12 soldered connections along each of 4 sides only 9mm (3/8”) long. Once upon a time, the friendly TV repair man would study a PCB and, indeed, resolder a dry joint or remove and replace a dead capacitor. Nowadays, though, his job would be very difficult. He would be hard pressed to see any fault, let alone expect his trusty Antex to reach between the connections.
It is the same with Vaillant’s PCB – only 130mm by 250mm but with hundreds of tiny SMD resistors, diodes, inductors etc on one side, as well as a myriad of larger electrolytics, etc. On the back, hundreds more solder connections.
And so, PCBs are regularily thrown out because on-site repair would be too difficult. I understood the diagnosis my repair man made on looking at the still unopened boiler, “dry joint”, to be a generic modern version of, “Something’s broken on the PCB”. It may well have been an aged electrolytic, dying IC or, indeed, a dry joint.
His solution - Vaillant’s solution - was to replace the board. It solved the problem and that’s what he and I wanted.
Yes, it seems wasteful that the old PCB was scrapped but that is how it is these days. We no longer recut or retread tyres, re-lead big end bearings. Even Maplin couldn’t make a business selling electronic components.