How to distinguish the quality of the LED cell board? Look at the material LED cell board plate: Some LED cell board manufacturers use low-cost flame-retardant paperboard or single-sided fiberboard as LED lamp PCB circuit board for low-price competition. Because, all glass fiber PCB board is too expensive. There is no difference in the beginning effect. Fortunately, if you are lucky, you can hold it for six months or eight months. Under normal circumstances, it will break due to moisture, UV damage, oxidation, etc., resulting in the scrapping of the entire LED cell board. High-quality LED cell boards must use double-sided fiberglass PCB boards, which are cost-effective but guaranteed.
IC: Observe the consistency of the brand of IC devices used. What type of IC is used and how many ICs are used will affect the quality of the board. Some businesses, in order to save costs, deliberately reduce the number of ICs when manufacturing cell boards, or include some other brands of ICs. Different ICs, how can we guarantee the stability of the performance of the board?
Lamp beads and chips: The naked eye can't tell whether the lamp is good or bad. Can only rely on long-term tests, that is, experts say aging test. The general practice of small workshops is to power on the factory and check whether the LED display can work normally and it will not undergo long-term aging tests. Because they can't afford this time cost and labor cost.
How to distinguish the quality of the LED cell board? Specific inspection methods
Examine the appearance quality of selected materials 1 PCB plate and processing quality;
2IC device brand and consistency;
3 luminous lattice quality;
Design specification, circuit check circuit, PCB routing in line with the technical requirements of the LED display to check whether the welding quality <br> <br> <br> <br> element has leak inspection stickers patch, paste error phenomenon, if there is a short circuit burr pin element phenomenon. Check whether the straight solder joints are smooth and round, whether the board surface is clean and tidy, and whether there is no false solder leakage soldering. Check the uniformity of the insert flatness and the ink color of the luminescent dot matrix.
Power-on test (refer to "Performance Test Report" step)
1 power test consistency of the luminous lattice;
2 Power test is effective to protect the line drive tube CEM4953;
3 power test signal transmission capability.
LED display business, let go! Rejecting cheap low-grade goods, quality is king.
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Optimal test method for drilling parameters:
1. Drill for 5 minutes with initially selected proper WOB and moderate RPM (60~100r/min) and record the ROP (as shown in the table below).
2. Moderately inctease WOB and keep the same RPM and drill under this WOB for 5 minutes and again record the RPO (as shown in the table below).
3. Decrease WOB b the same extent and tepeat step 2.
4. Find the WOB in the tow groups of test than can yield highest ROP.
5. Properly change RPM under optimal WOB and record the ROP (as shown in the table below).
6. Select the RPM at the highest ROP.
7. Set the drilling parameter at the best combination:60KN RPM: 120r/min
Times
RPM:100r/min
WOB:60KN
WOB
(KN)
Drilling hour
(Min/m)
RPM
(r/min)
Drilling hour
(Min/m)
1
80
8
100
7
2
100
9
120
5.5
3
60
7
80
8
Select
60
7
120
5.5
Drilling Tools
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